Oct 252013
 

The ConversationBy Nathalie Butt and Hawthorne Beyer at The Conversation

Photo: Yasuni National Park in Ecuador is one of the world’s most biodiverse regions. It’s home to country’s largest oil field. Photo: Flickr/joshbousel

Photo: Yasuni National Park in Ecuador is one of the world’s most biodiverse regions. It’s home to country’s largest oil field. Photo: Flickr/joshbousel

Greenhouse gases produced by the burning of fossil fuels have resulted in well-publicised changes to the Earth’s climate. But the impacts of fossil fuels start long before their carbon dioxide reaches the atmosphere. Our new research, published today in Science, looks at the effects of coal, oil and gas extraction on biodiversity.

The problem

Biodiversity loss is accelerating, and the risks to biodiversity are increasing. We are in the midst of a global biodiversity crisis.

The biggest threats to biodiversity are human activities. These act across a range of scales. Even local biodiversity loss can have knock-on large scale impacts on ecosystem function and productivity.

Fossil fuel consumption and demand show no signs of levelling off, let alone decreasing. Of course more consumption means more refineries, power stations and infrastructure, in addition to the extraction itself.Energy outlook 2030, BP 2030

Given the increasing demand and consumption, it is reasonable to assume that most if not all remaining fossil fuel reserves will be exploited, using conventional and new methods such as fracking.

Mining and drilling have often been seen as having limited environmental impacts. It’s often assumed that restoring ecosystems after fossil fuel extraction can ultimately return the ecosystem to a state close to what it was before.

And the effects of extraction activity have generally been considered trivial compared with other human activities, such as large-scale agricultural land clearing. But this is not the case: fossil-fuel extraction causes disturbance and degradation to ecosystems.

The impacts of fossil fuel extraction fall into three main categories: the direct impact of extraction activity, indirect impacts of infrastructure development and expanded human activity, and the consequences of extraction disasters. Road building is in fact the main catalyst for irreversible ecosystem change.

The various ways fossil fuel extraction impacts on biodiversity.

The various ways fossil fuel extraction impacts on biodiversity.

Critical areas

In our research we compared areas of biodiversity and reserves of fossil fuel. We identified two key regions where fossil fuel reserves coincide with high levels of biodiversity and threatened species: the western Pacific Ocean and northern South America.

The Western Amazon, in northern South America, includes parts of Bolivia, Columbia, Ecuador, Peru and western Brazil. It’s one of the most biodiverse areas on the planet and also contains large reserves of oil and gas.

The forest also provides vital ecosystem services – water, climate regulation and carbon storage, which all have implications for biodiversity conservation globally.

Large oil and gas projects already developed in the area have caused major environmental and social impacts, including deforestation for construction of roads, drilling platforms and pipelines, contamination from oil spills and waste-water discharge. Each kilometre of road constructed means 4-24 km2 of deforestation for colonisation and related agricultural development.

We also looked at Western Papua New Guinea in the western Pacific, where oil extraction and transport pose an increasing risk to mangrove and coral ecosystems.

These mangrove forests support the highest diversity of mangroves globally, and are home to many rare and endemic plant and animal species. The abundant and diverse coral reefs in the region are some of the most pristine and least exploited in the world.

Oil spills would cause profound damage. Projections based on historic spill rates and estimated oil resources in the region suggest that the area could expect approximately four spills larger than 10,000 barrels in a 15-year period. As Gulf of Papua currents circulate to the Great Barrier Reef along Cape York in Australia, the potential biodiversity loss in the event of a catastrophic spill would extend far beyond the local waters.

Mapping of fossil fuels shows the risks to biodiversity.

Mapping of fossil fuels shows the risks to biodiversity.

What can we do?

We’ve identified a new substantial risk to key biodiversity areas globally, but are there any solutions?

Many countries in the high risk areas have weak governance and poor implementation and enforcement of environmental regulations, and may lack the ability to respond effectively to environmental disasters.

They may also be too remote or undeveloped to attract much media coverage – and so environmental damage may remain undetected and unaddressed.

International environmental organisations could fulfil an essential role by ensuring that fossil fuel extraction takes place according to best practises and ideally avoids areas of high biodiversity. It is crucial that trade-offs between biodiversity conservation and development are properly assessed to ensure threatened or endemic species are not lost.

International pressure can also help to ensure that any environmental damage that does occur is mitigated and the companies involved are appropriately penalised, as in the case of BP and the Deepwater Horizon disaster.

One possible mechanism to preserve biodiversity in fossil fuel-rich areas was recently attempted at Yasuní National Park in Ecuador. This highly biodiverse also area has the country’s largest oil reserves.

In 2007 the Ecuadorean government proposed that in return for not extracting the oil from the park, and keeping the forest biodiversity, they would be compensated. The funds were to be raised through the international Green Climate Fund (UNFCCC), to the value of $3.6 billion, about half the value of the oil.

Ten per cent of the money was raised, from countries, regions, corporations, foundations and individuals, to be invested in renewable energy projects. But unfortunately due to lack of global commitment and organisational support the project failed. Oil extraction will now go ahead. If the international support was strong, and organisation effective, schemes such as this could be a way of protecting biodiversity in fossil fuel rich areas.

Of course, the bottom line is that we need to decrease our fossil fuel demand, extraction and consumption; the rest is pretty much just rearranging the deck chairs.

Nathalie Butt receives funding through the ARC Centre of Excellence for Environmental Decisions at the University of Queensland

Hawthorne Beyer receives funding through the ARC Centre of Excellence for Environmental Decisions at the University of Queensland.

The Conversation

This article was originally published at The Conversation.
Read the original article.

Oct 232013
 

Original story by Carlos Duarte, University of Western Australia at The Conversation

In an emotional article making waves on social media at the moment, yachtsman Ivan Macfadyen reports seeing no marine life at sea, only floating rubbish, while sailing across the Pacific. He concludes that “the ocean is broken”.

A tide of tsunami debris is heading across the ocean - that doesn’t mean the ocean is broken. Photo: US Navy

A tide of tsunami debris is heading across the ocean – that doesn’t mean the ocean is broken. Photo: US Navy

I understand Ivan’s feelings, as I too have sailed tens of thousands of miles onboard research vessels and on my sailboat, enjoying the slow and silent pace of life propelled by wind and waves.

The two issues Macfadyen raises – overfishing and plastic pollution – are real problems. More than three-quarters of the oceans’ fish stocks have been depleted, sometimes beyond recovery. The global tuna industry, particularly, is better portrayed as the War On Tuna than a fishery. And the world’s oceans are filled with large amounts of plastic debris, which are eaten or caught up in marine life or seabirds, or which break down into microscopic particles that are ingested and affect wildlife in ways we don’t yet know.

So yes, there are plenty of problems in the ocean. But it is not yet broken. I am increasingly upset about reports that say it is; we scientists are to some extent to blame, as we love being the bearer of bad news, composing an overly apocalyptic narrative.

Depicting the ocean as broken and suffering from a litany of plagues including climate change, hypoxia, eutrophication, ocean acidification, marine pests, spreading jellyfish blooms, and loss of valuable habitat, suggests a problem beyond repair. This eventually deters society from engaging. These plagues are certainly real, but their severity is sometimes exaggerated through a feedback loop involving, among others, the spinning of research headlines to compete for media attention.

The ocean has many problems - plastic debris among them - but is a long way from “broken”. Photo: USFWS

The ocean has many problems – plastic debris among them – but is a long way from “broken”. Photo: USFWS

Let’s focus on Macfadyen’s evidence for a broken ocean: two snapshots of the Pacific, ten years apart, suggesting a depletion of marine life and huge plastic pollution.

The ocean is a dynamic ecosystem, which fluctuates broadly over time, from its physical and chemical properties to the abundance and distribution of fauna and flora. Such fluctuations can deceive the casual observer – to detect real change requires high quality data gleaned from systematic long term observations.

For instance, my co-workers and I analysed global changes in jellyfish populations, and found there is no basis to the claim that they are growing “plague”. Instead, we found that jellyfish populations fluctuated over 20 year cycles, giving the misleading perception that the most recent rising phase of this cycle (roughly between late 1990s and late 2000s) was an unprecedented event.

Likewise, we also know that many changes portrayed as symptoms of a broken ocean, such as coral bleaching, outbreaks of invaders such as the crown of thorns starfish or toxic algae, may also largely represent symptoms of global oscillations that we do not yet fully understand and in which humans’ actions play little or no role. Separating the human impacts entwined in such natural fluctuations is a daunting task, so we should not be too quick to jump to conclusions and blame humans for all the changes we see around us. Our analysis showed that such fluctuations happened in the past, but very few scientists were watching and they lacked the channels, such as the internet, to share their results.

Soon after the earthquake and tsunami of March 2011 that triggered the Fukushima accident, NOAA published models that predicted how the huge amount of debris washed into the ocean by the power of the retreating waves would take three years to travel across the ocean and wash up sometime in 2014 on the beaches of California, Oregon and Washington in the US. Had Macfadyen checked NOAA’s web page, he’d have expected the garbage patch he encountered.

The tsunami was not caused by humans, so we should rein in our feelings of guilt about it. It does, however, provide a brutal exposure to the reality that we feverishly consume and dispose of too many, mostly plastic objects, many manufactured with harmful chemicals, that we use just for just a short while and then throw away.

What kind of fishing line did Macfadyen use in his first voyage, and what happened to it when he’d finished? What chemicals are in the anti-fouling paint for his boat’s hull? Likewise, how and where was the fish we consumed with our last meal captured? Did it come from a sustainable fishery or a sustainable aquaculture farm? Did we bother to ask if it was a certified product? Do we demand that this information be displayed to guide our choices as consumers?

Should we eat tuna, an apex predator at the top of the food chain, or should we settle for sardines, oysters and seaweed? Was that chicken we ate yesterday for dinner fed fishmeal? Do we drive a four-wheel drive car whose CO2 emissions will further acidify the oceans, or do we cycle, drive a hybrid or electric vehicle or catch a bus powered by biofuels? Do rich, developed nations with among the world’s largest greenhouse gas footprints refuse to implement carbon taxes or emissions reduction strategies because we “cannot afford” them?

These questions are not easy ones to ask ourselves, but we confront our contradictions. We enjoy eating seafood, an essential component of a healthy diet. We know that fish stocks are over exploited, so developing aquaculture is the only avenue to sustainably meet the growing demands for seafood. But then we get upset if we can see an aquaculture farm off our coasts.

Responsible consumers will not break the ocean; those who choose to ignore the consequences of their day-to-day decisions as consumers will. The place where the struggle to save the oceans from breaking is fought everyday – not once every ten years – is at our local shops.

Carlos Duarte receives research funding from The EU Framework Program, the Spanish National Research Plan and the CSIRO, and he is affiliated with the Spanish National Council for Scientific Research (CSIC) and The University of Western Australia.

The Conversation

This article was originally published at The Conversation.
Read the original article.

Oct 202013
 

 

RISING temperatures are threatening Christmas Island’s iconic red crabs, according to a new study.
The Christmas Island red crabs make a lengthy annual journey across the island to the Indian Ocean to mate and lay their eggs.

The Christmas Island red crabs make a lengthy annual journey across the island to the Indian Ocean to mate and lay their eggs.

The red crabs make a lengthy annual journey across the island to the Indian Ocean to mate and lay their eggs.

The study  published in the latest Global Change Biology journal – found that a lack, or delay, of rain can throw the crabs’ migration habits into chaos.

Lead author Allison Shaw, from the Australian National University, said most crabs could only migrate if there was at least 22mm of rain. Their reproduction relied on a successful migration.

“We found that the crab migration is closely linked to the amount of rain falling and that rainfall is in turn linked to El Nino Southern Oscillation,” Dr Shaw said.

Lead researcher Allison Shaw in among the crabs.

Lead researcher Allison Shaw in among the crabs.

The El Nino warm-water climate pattern creates dry conditions in the Indian Ocean, resulting in low rainfall on Christmas Island.

Dr Shaw said global climate change models suggested El Nino would become more common as the planet got hotter.

“Our study shows that more really dry years will mean more years in which the red crabs cannot migrate, which will be pretty detrimental for them,” Dr Shaw said.

“If fluctuations in rainfall become more extreme and frequent with climate change then scores of animals could be in trouble  not just the migrators themselves, but also the creatures reliant on them for food. The red crabs play a key role in the both terrestrial and marine areas of Christmas Island.”

Red crabs on Christmas Island.

Red crabs on Christmas Island.

The study, funded by National Geographic, is part of Dr Shaw’s work as a doctoral student in ecology and evolutionary biology at Princeton University in the US.

Oct 202013
 

Original story at news.com.au

THE frogs are freaking, the birds are going ballistic, gorged goannas are resting, thirsty river red gums are giving thanks and the yabbies are, well, yabbying.
Chrisophe Tourenq, the wetlands manager at the Banrock Station wetlands. Photo: Simon Cross/News Limited

Chrisophe Tourenq, the wetlands manager at the Banrock Station wetlands. Photo: Simon Cross/News Limited

Days after a sluice gate opened to allow a life-giving flow of Murray River water into a parched wetland in South Australia’s Riverland, the sound of breeding and feeding is deafening. Banjo frogs, Pearson’s tree frogs and spotted grass frogs battle with distinctive croaks in suddenly lush lagoons. Red gums, black box, lignum and more are drinking deeply and creatures with feather, fur and scales are romancing.

The ancient cycle of life is being played out with human help at the 1000ha of internationally Ramsar-listed floodplains and wetlands at Banrock Station at Kingston-on-Murray.

Locks that now regulate the Murray into a tamed series of pools also cut off the natural cycle of wetting and drying, which wetland flora and fauna have adapted to over millennia of flood and drought.

Banrock’s wetlands were flooded for 68 years, drowning plants that liked water but also relied on the occasional dry spell. Germination and mating signals were rudely put on hold.

In 1993 the wetlands were dried and 60 tonnes of carp were stranded. Now a winery with 250ha of vines on the overall 1800ha property and an environmental focus giving the brand international green clout, Banrock was last fully dried then artificially flooded from the Murray in 2008.

Banrock Station wetlands the day after the Murray River floodgates were opened. Photo: Simon Cross/News Limited

Banrock Station wetlands the day after the Murray River floodgates were opened. Photo: Simon Cross/News Limited

A natural flood in 2011 bathed the wetland but this year it was parched, which saw
5 tonnes of carp gorged on by tree goannas, and dormant native flora and fauna bracing for action. That started on September 4 when a sluice gate was opened to allow flow from the Murray to gradually flood the land, under an environmental licence.

The slow flow of the Murray and the vast area of flatlands means it was a creeping flow that took almost a month to cover the floodplain. As it does, the spreading noise of breeding and feeding signals the plants and animals are alert to the ancient cycle of life. There is now a frenzy of breeding under way.

Visitors to the Wine and Wetlands Centre sited high on the ridge line overlooking the wetlands and river have grand views of the natural phenomenon, and can easily hear the symphony of life under way.

The centre does a brisk trade in wine tasting and merchandise as well as having plenty of information about the local environment, drawing about 85,000 visitors a year. Its deck area is fabulous to take in the views and enjoy coffee and cake or or a long lunchsavour plenty of local produce matched to Banrock wines.

However, the views soon prompt itchy feet.

There are kilometres of boardwalks winding through and over the region’s wetlands, offering four walks ranging from a quick stickybeak to several hours of strolls.

Bird hides hidden in the trees give great views of many of the 161 local species. And you can’t miss the noise of the frogs from the once- dormant frogs which creatures now can be heard from the distant visitor centre.

In billabongs, native fish and invertebrates are revelling in the floods, as are the many plants and trees which like both the dry and a drink.

Banrock Station wetlands after the Murray River floodgates were opened. Photo: Simon Cross/News Limited

Banrock Station wetlands after the Murray River floodgates were opened. Photo: Simon Cross/News Limited

The sluice gate has a carp trap stopping larger fish from entering from the Murray, giving the natives a break. When the next dry comes, the natives will naturally head back to the river via a second exit while any baby carp that slipped through the trap and grew will congregate in ever shrinking ponds and die.

Wetlands manager Christophe Tourenq says the flood is timed to coincide with the natural cycle when snow melting from the Australian Alps would swell the Murray’s floodplains in wet years.

“We are mimicking the cycle of drying and wetting that this land relies on,” he says. “The wetlands have to dry, then be flooded again. We are seeing all sorts of species in a healthy ecosystem.” From plants such as pigface to slender knotweed, from banjo frogs to pelicans, wetland residents are drinking in a good time.

Banrock Station does not have visitor accommodation, but the lure of the Murray made the choice for an overnight stay easy. We headed upriver to Berri where Houseboat Adventures have five luxurious craft berthed at the marina.

Flagship Sensational Spirit has five bedrooms, each with an ensuite, and facilities from a large spa and bar on the shaded sundeck through to full kitchen for your home on the water. And you only need a car licence to drive it.

After a day seeing the Murray give life to wetlands, it was easy to cruise into the sunset with a cold drink, just rolling on the river.

The writer was a guest of Banrock Station.

GO2 BANROCK STATION
Getting there

Banrock Station is just over two hours’ drive northeast of Adelaide at Kingston-on-Murray in the Riverland.

Doing there

Banrock Station is open 9am-4pm weekdays, 9am-5pm weekends. Closed Good Friday, Christmas Day and New Year’s Day. Cafe opens from 9am, grazing plates available from 10am, lunch from noon to 3pm. Free entry. Guided walks available on public holidays.

More info

banrockstation.com.au

houseboatadventure.com.au

Oct 192013
 

News release by by ,  Vanderbilt University

A fungus that is killing frogs and other amphibians around the world releases a toxic factor that disables the amphibian immune response, Vanderbilt University investigators report this week in the journal Science.
Louise Rollins-Smith, Ph.D., J. Scott Fites and colleagues are studying a toxic factor released by a fungus that disables the amphibian immune response. Photo: Joe Howell.

Louise Rollins-Smith, Ph.D., J. Scott Fites and colleagues are studying a toxic factor released by a fungus that disables the amphibian immune response. Photo: Joe Howell.

The findings represent “a step forward in understanding a long-standing puzzle — why the amphibian immune system seems to be so inept at clearing the fungus,” said Louise Rollins-Smith, Ph.D., associate professor of Pathology, Microbiology and Immunology. Although the identity of the toxic fungal factor (or factors) remains a mystery, its ability to inhibit a wide range of cell types — including cancerous cells — suggests that it may offer new directions for the development of immunosuppressive or anti-cancer agents.

The populations of amphibian species have been declining worldwide for more than 40 years. In the late 1990s, researchers discovered that an ancient fungus, Batrachochytrium dendrobatidis, was causing skin infections, and the fungus is now recognized as a leading contributor to global amphibian decline.

Rollins-Smith, an immunologist, and her colleagues have been studying the immune response to the fungus for more than 10 years.

“Amphibians have excellent and complex immune systems — nearly as complex as humans — and they should be able to recognize and clear the fungus,” she said.

In early studies, the investigators demonstrated that some frogs produce anti-microbial peptides in the skin that offer a first layer of defense against the fungus. But when the fungus gets into the layers of the skin, Rollins-Smith said, the conventional lymphocyte (immune cell)-mediated immune response should be activated to clear it.

They found in the current studies that recognition of the fungus by macrophage and neutrophil cells was not impaired.

Poison dart frogs are threatened by fungal infections that paralyze their immune response. Photo: Louise Rollins-Smith, Ph.D.

Poison dart frogs are threatened by fungal infections that paralyze their immune response. Photo: Louise Rollins-Smith, Ph.D.

“We think it’s not a block at the initial recognition stage,” Rollins-Smith said. “The macrophages and neutrophils can see it as a pathogen, they can eat it up, they can do their thing.”

But during the next stage of the immune response, when lymphocytes should be activated, the fungus exerts its toxic effects. The investigators demonstrated that B. dendrobatidiscells and supernatants (the incubation liquid separated from the cells) impaired lymphocyte proliferation and induced cell death of lymphocytes from frogs, mice and humans. The toxic fungal factor also inhibited the growth of cancerous mammalian cell lines.

The toxic factor was resistant to heat and proteases (enzymes that cut proteins into pieces), suggesting that it is not a protein. It appears to be a component of the cell wall, because drugs that interfere with cell wall synthesis reduce its inhibitory activity and because the zoospore — an immature form of the fungus that lacks a cell wall — does not produce the factor.

The new findings suggest the possibility that toxic factors — in addition to acting locally to inhibit the immune response — might also get into the circulation and have neurotoxic effects, Rollins-Smith said.

“Fungal infection causes rapid behavioral changes — frogs become lethargic and start to crawl out of the water — suggesting that even though the fungus stays in the skin, the toxic material is having effects elsewhere.”

The studies, led by graduate students J. Scott Fites and Jeremy Ramsey, could also suggest new conservation measures for species that may be medically important.

“Amphibian skin has long been favored in folklore for its medicinal properties,” Rollins-Smith said. “Frogs are a rich source of potentially useful molecules that might work against human pathogens.”

The research was supported by grants from the National Science Foundation. Other authors of the Science paper include Whitney Holden, Sarah Collier, Danica Sutherland, Laura Reinert, Sophia Gayek, Terence Dermody, M.D., Thomas Aune, Ph.D., and Kyra Oswald-Richter, Ph.D.

Contact:
Leigh MacMillan, (615) 322-4747
leigh.macmillan@vanderbilt.edu

Oct 182013
 

Media release from ARC CoE for Environmental Decisions (CEED) at SciNews

In a bid to save endangered animals from extinction by climate change, a team of Australian and New Zealand environmental scientists has pioneered a revolutionary way of deciding whether animals can safely be re-located.

“With the climate changing more rapidly than species can move or adapt, our only chance of saving some species may be to move them to more climatically suitable areas,” says lead author Dr Tracy Rout of the ARC Centre of Excellence for Environmental Decisions (CEED) and The University of Melbourne.

“But introducing species to areas outside their historical range is a controversial strategy – and we have to be sure it will work, both for the animals themselves, and for other species in their ‘new’ habitat.”

The researchers developed a rigorous framework which can quantify whether the benefit of moving a species outweighs the ecological cost. The study, published in the journal PLOS ONE, is intended to help wildlife managers take the difficult decision whether to move animals into new areas – or leave them in places that may become uninhabitable for them.

Western swamp tortoise (Pseudemydura umbrina), Adelaide Zoo. Photo: Bahudhara/Wikimedia Commons

Western swamp tortoise (Pseudemydura umbrina), Adelaide Zoo. Photo: Bahudhara/Wikimedia Commons

“The critically endangered Western Swamp Tortoise is one possible candidate. Australia’s rarest reptile, it currently faces extinction as the swamps it calls home dry up due to declining seasonal rainfall. One way to save the species is to move it to new sites far to the south of its current range on the outskirts of Perth,” she explains

“Another is the Mountain pygmy possum, a tiny mammal that currently resides on three snowy mountain tops in Victoria and New South Wales where snow cover is rapidly declining. A third is the Golden Bowerbird, a strikingly yellow rainforest bird from north Queensland.

“When we move an animal, we need to be certain that it will not only survive and prosper, but it will do no harm to other species in its new habitat.”

At present such decisions are already being taken by wildlife managers around the world using a mix of subjective judgement and scientific prediction. The team has taken a lot of the guesswork out of this process by developing the world’s first rigorous quantitative framework that combines scientific prediction with clear management goals.

“Our framework separates these out, makes them explicit, and then combines them in a logical way,” Dr Rout says.

“Our approach uses tried and tested tools from economics and applied mathematics to make smarter conservation decisions,” explains Professor Hugh Possingham, co-author and director of the ARC Centre of Excellence for Environmental Decisions.

“This new framework takes into account the benefit of moving a species based on the likelihood it will go extinct in its original habitat as the local climate becomes hostile, the likelihood that a breeding population can be established at a new site, and the value or importance of the species.

“The ecological cost depends on the potential for the species to adversely affect the ecosystem at the new site. Species are considered candidates for re-location only if the benefit of doing so is greater than the ecological cost.”

The framework is intended to support the revised “IUCN guidelines for re-introductions and other conservation translocations”, which explicitly calls for structured decision-making frameworks for conservation introductions.

A Tuatara (Sphenodon punctatus), in Waikanae, New Zealand. Photo Samsara/Wikimedia Commons

A Tuatara (Sphenodon punctatus), in Waikanae, New Zealand. Photo Samsara/Wikimedia Commons

The researchers have ‘test-driven’ the new framework using the hypothetical case of the New Zealand tuatara, the country’s largest reptile, which is being considered for relocation from its home on a number of small offshore islands in the north of NZ to the South Island, where it is currently extinct.

The study was funded by: The ARC Centre of Excellence for Environmental Decisions (CEED), The Environmental Decisions Hub of the National Environmental Research Program (NERP), The Climate Adaptation Flagship at CSIRO Ecosystem Sciences, The University of Queensland, The University of Melbourne, The University of Western Australia, and Massey University.

CEED is the Australian Research Council Centre of Excellence for Environmental Decisions. CEED’s research tackles key gaps in environmental decision making, monitoring and adaptive management.
Complementing CEED’s work is the research of the NERP Environmental Decisions Hub.

NERP is the National Environmental Research Program funded by the Australian Government. The Environmental Decisions hub develops and tests tools, ideas and strategies for tackling the major challenges facing Australia’s environmental managers and policy makers.

More information:
Dr Tracy Rout, CEED and University of Melbourne, +61 (0)7 3365 1378 or 0403 969 344
Professor Hugh Possingham, CEED and UQ, +61 (0)7 3365 2527 or +61 (0)434 079 061
Melisa Lewins, CEED, +61 (0)7 3365 2450

www.ceed.edu.au
www.nerpdecisions.edu.au

Oct 152013
 

Original story by AFP

Gentoo penguins are seen on the shore of King George Island, Antarctica, on October 28, 2008.  Photo: AFP, Martin Bureau

Gentoo penguins are seen on the shore of King George Island, Antarctica, on October 28, 2008. Photo: AFP, Martin Bureau

Ancient penguin droppings and the impact of global warming on the Antarctic food chain will be the focus of Australia’s latest scientific mission to the icy continent which departed Tuesday.

The icebreaker Aurora Australis set off from Hobart with a research team and some 600 tonnes of cargo for its annual mission this Antarctic summer, which typically runs from October through to April.

Researchers from the government’s Australian Antarctic Division said they would have two major focuses, exploring the historical feeding habits of Adelie penguins and impacts of ocean acidification on phytoplankton and bacteria, the smallest building blocks of the southern continent’s ecosystem.

Seabird expert Barbara Wienecke will lead an archaelogical survey of abandoned penguin sites, excavating ancient droppings to determine how their diets have changed over time and what implications that could have for the management of Southern Ocean fisheries.

“We will be digging down into the old soils formed from bird waste and looking for the remains of prey, such as fish ear-bones and squid beaks,” said Wienecke.

“It is the first time this type of work has been done in the Davis region and we are hopeful of finding out whether Adelie diets changed in the past, for example, from krill to fish-based diets,” she added.

“Gaining this knowledge can help manage Southern Ocean fisheries to avoid disrupting the Antarctic food chain.”

A microbial biology team, led by Andrew Davidson, will explore the effects of growing ocean acidification on microbes, across six 650-litre tanks called “minicosms” which will model different carbon dioxide concentrations.

“Microbes are the base of the marine food web, directly or indirectly supporting all life in the Southern Ocean. They also drive the ‘biological pump’, the process by which marine life transfers CO2 from the atmosphere to the deep ocean,” he said.

“However, the concentration of CO2 predicted in seawater by the end of this century may dramatically change the composition of these communities by altering food webs — having an impact on iconic Antarctic wildlife such as whales and seals — and reducing the efficiency of the ‘biological pump’ with consequences for the global climate.”

The Aurora Australis resupplies both Australian and foreign bases in Antarctica during the summer, doing about five restocking runs before the thick sea ice becomes impassable.

Australia has three Antarctic bases — Davis, Casey and Mawson — as well as a sub-Antarctic station at Macquarie Island.

Oct 102013
 

Original story by Stephen Williams and Brett Scheffers, James Cook University at The Conversation

This rare white lemuroid possum is just one of the species that will see dramatic effects of climate change. Photo: Mike Trennery

This rare white lemuroid possum is just one of the species that will see dramatic effects of climate change. Photo: Mike Trennery

 

Australia is already feeling the effects of climate change, with record-breaking temperatures not just over summer, but over the past 12 months as well. Research suggests that such events are many times more likely thanks to climate change.

The IPCC fifth assessment report on climate science found evidence for climate change is unequivocal. The impacts of increasing frequency and intensity of extreme weather events on people and our environment are real and undeniable. But what’s happening to our animals and plants? Our research in Queensland is starting to give us some clues.

Warning from the rainforest

More than 10 years ago, we made predictions that the animals in the World Heritage-listed rainforests of north Queensland faced a grim future.

In the Queensland Wet Tropics we’ve compiled one of the most robust databases on species distributions on Earth, enabling us to vastly improve our understanding of these systems and to monitor changes.

Animals are adapted to specific temperature ranges. As temperatures increase thanks to climate change, we predicted animals and plants would move up mountains as they attempted to remain at cooler temperatures. Eventually they would reach the top of the mountain and have nowhere else to go.

Unfortunately, our predictions are now starting to come true.

In our monitoring in the world heritage rainforests, we recently confirmed that at least 13 bird species and four species of ringtail possums have moved up the mountains in order to remain at cooler temperatures just as we predicted a decade earlier. Strikingly, their shifts are detectable over just 10 years with only a fraction of the temperature change that we will experience over coming decades.

Thus, small changes in climate can have more severe effects on biodiversity than previously though.

In addition to a steady increase in mean temperature, climate also affects animals via the increasing severity and frequency of extreme events such as heat waves.

For example, our research over the past 10 years showed that lemuroid ringtail possums have declined in the northern mountain ranges. The culprit is heatwaves, which have increased in intensity and length over the past 50 years. In the summer of 2005, maximum temperatures went over the possum’s physiological tolerance for 27 days in a row. The possums couldn’t escape, and widespread deaths ensued.

Unlike heat extremes, increasing average temperatures will slowly but inexorably push species up mountain sides where they will eventually run out of room and shelter. We now have evidence that numerous species in the Wet Tropics region will share similar fates to the Lemuroid Possum.

Beyond Australia

Our recent work in the Philippines has added another dimension to our knowledge of climate change and its effects on rainforests.

We found that rainforest vegetation creates a climate gradient – much like the gradient you can find going up a mountain. This gradient is far steeper than changes in climate that may occur over hundreds of metres of elevation, or hundreds of kilometres of latitude. The tiered vegetation within just 20 metres of rainforests can reduce temperatures by more than 2C and increase humidity by over 10%.

Animals and plants organise themselves along this gradient, living in the part they find most comfortable.

But when the rainforest heats up thanks to climate change, animals and plants move down the trees because, at low elevations at least, the canopy becomes too hot. We call this process “flattening”, and it will have severe consequences for biodiversity. For example, we show that as animals move towards the ground in response to warmer temperatures, the density of animals on the ground may increase by over 80%. This is like trying to fit 100 people in a bus that only has space for 20 – it just doesn’t work.

Climate change may create an extinction zone in the lowlands that starts in the canopy and moves down towards the ground. As the Earth continues to warm, this zone will then expand upwards in elevation. This novel finding is relevant to many ecosystems in Australia and globally.

What to do now

So how do we deal with these dire forecasts? Both mitigation and adaptation will be critical for saving species.

Here in Australia and abroad we’ve discovered that intact forests that offer a variety of complex structures can reduce the severity of extreme climate events. These structures are like small air-conditioning units in the rainforest that smaller species can use. Thus, intact and protected rainforests will be critical for species adaptation and safeguarding biodiversity as the Earth warms.

But even this isn’t enough in the long term. By 2100 no amount of air-conditioning will offset the temperatures predicted.

Species loss offers a compelling argument to act now on mitigation policies like cap and trade, offsets and emissions reductions.

Why should we do so? The Wet Tropics of Queensland are a globally-significant world heritage area that provide habitat for species found nowhere else on earth, including nearly 100 unique mammals, birds, reptiles and frogs, and thousands of species of insects and plants.

The region is also incredibly valuable economically. Eco-tourism stimulates the regional economy to a tune of A$4-5b a year. And our fresh clean drinking water comes primarily from these forests.

We could say the same about other ecosystems in Australia and the animals and plants that are part of them. Without mitigation and adaptation, many will suffer from climate change, and that’s bad news for us too.

Steven Williams has received funding from NCCARF, ARC, Commonwealth Environment Research Program, Marine Tropical Science Research Facility, National Environmental Research Program – Tropical Ecosystems Hub, James Cook University, Earthwatch Institute, Singapore International Graduate Award and Wildlife Reserves Singapore Conservation Fund.

Brett Scheffers has received funding from NCCARF, ARC, Commonwealth Environment Research Program, Marine Tropical Science Research Facility, National Environmental Research Program – Tropical Ecosystems Hub, James Cook University, Earthwatch Institute, Singapore International Graduate Award and Wildlife Reserves Singapore Conservation Fund.

The Conversation

This article was originally published at The Conversation.
Read the original article.

Oct 052013
 

Original story by Trent Dalton, The Australian

Juergen is the biggest crocodile captured by Australia Zoo.

Juergen is the biggest crocodile captured by Australia Zoo.

HER dad died when she was eight years old. In the days and weeks after his death she developed a profound fear that awful things were inevitably going to happen to the ones she loved most in her life – her mother, Terri, and younger brother Robert. To combat this fear she developed an ambitious and exhausting plan to never let her mother and brother out of her sight.
Bindi reads a speech at her father's memorial service. Photo: AFP

Bindi reads a speech at her father’s memorial service. Photo: AFP

“Step back a bit, Robert,” whispers Bindi Irwin, her left arm drawing her nine-year-old brother two steps backwards into a patch of dry, straw-coloured grass lining the bank of the Wenlock River, Cape York Peninsula, giving him enough space to escape the jaws of an unrestrained 4.7m crocodile named Juergen. “You know your exit?” she asks.

Her grandfather, Clarence Raines, died when she was 10 years old while she was visiting him in her mother’s hometown of Eugene, Oregon. Raines, a World War II veteran, was a man of some renown. He’d served his country, served his community in the local police force and, upon retirement, served his mind by reading every book in the Eugene Public Library. Bindi sometimes flips through the journal her grandfather kept documenting that remarkable feat, running her tanned forefinger along the endless names of authors and their works, listed A-to-Z. The journal makes her think anything can be achieved in a lifetime with the assistance of time and desire.

Terri pounces on Juergen the croc. Photo: AFP

Terri pounces on Juergen the croc. Photo: AFP

When Juergen moves, the earth vibrates. The 900kg croc has been on this Earth for 60 years, spending a good portion of that time swimming the food-rich, pristine waterways of the Steve Irwin Wildlife Reserve – a 135,000ha Cape York floral and faunal sanctuary created by the Howard government in 2007. It’s run by the Irwin family as a living memorial to the irrepressible conservationist who was fatally pierced in the chest by a stingray barb while filming an underwater documentary on September 4, 2006.

Robert points to a loose path running between two stringybark trees. “I’ll run away along here,” he says. Bindi nods, satisfied.

Her parents named her “Bindi” from the Aboriginal term for “young girl”. During the 10-hour labour that brought her into this world 15 years ago, a documentary film cameraman was recording the event from the head of her mother’s hospital bed. Terri Irwin has come to the conclusion that her daughter possesses the soul of an 86-year-old. She looks at her now and sees a young woman in bloom, a girl finding her place in the world, in private wonder and in the public eye. She sees a lover of science, books and films; the girl who wrote a 1000-word essay on the environment for US Secretary of State Hillary Clinton’s global e-journal and then publicly slammed the editors when they deleted the essay’s edgier passages about the perils of overpopulation and “too many people using too many resources”. She sees a 15-year-old already studying a Certificate 3 in business and tourism at Sunshine Coast University. She sees a writer of poetry and handwritten letters to friends, a reader of Shakespeare and German poets Terri wouldn’t have dreamed of exploring in her teens. She sees the girl who wakes up every morning and plays DVDs of her father’s wildlife documentaries. She sees the future.

The first thing Bindi does in a crocodile capture is to establish a clear exit path should the crocodile – an archosaurian monster built some 200 million years ago as much for survival as for killing – decide to turn about-face and attack his well-intentioned if physically pathetic human captors. She scans the capture site, at a shady point along the Wenlock known as “Jutout”. The bait – a fly-blown feral pig carcass – is raised into the air by two sandbag weights. It smells like death, drips thick burgundy blood into a puddle two feet from Juergen’s swinging sawtooth tail. It’s warm and humid. High tide. There was no moon last night, no wind blowing on campsite tents – the sort of conditions in which Juergen felt comfortable enough to explore that tempting aroma of pig gut wafting across his 65cm head.

Bindi kneels down to study his skin. His marvellous structure. She sees bite marks atop Juergen’s head shields. His webbing is split in his left foot. Juergen’s getting on. He lived through the Vietnam War, through The Beatles. He’s getting slower. He’s been getting bullied by younger, quicker crocodiles in the Wenlock. Juergen can withstand anything except the march of time. “We humans always want to overpower things, don’t we?” she whispers. “We could never overpower these animals.”

There’s a quiet tension at the capture site. Silence and fear. “There’s always that spark of electricity,” she says. “No matter how many times you see them.”

For 10 years Bindi has watched University of Queensland zoologist Professor Craig Franklin trap and track 110 crocodiles through these waters with a team of researchers and animal wranglers from the Irwins’ 40ha Australia Zoo, on Queensland’s Sunshine Coast. She’s been a fixture in the longest-running zoological research project in the world, making groundbreaking discoveries into the behaviour and physiology of crocodiles in the wild. They’ve developed world-leading technologies, painlessly fixing satellite tracking units to the concrete-like backs of crocodiles’ heads. It was this team that discovered crocodiles can stay underwater for seven hours; that crocodiles can travel 60km in a single day; that they are affectionate lovers; protective parents; judicious thinkers. It was this team that revealed the crocodile’s remarkable homing abilities; watched a crocodile that was airlifted from the west coast of Cape York Peninsula to the east coast navigate its way back around the cape, swimming 400km in 20 days to return home, at one point shifting direction from north to south. “How?” Franklin ponders. “I don’t know.”

Bindi has assisted the professor in so many insertions of acoustic underwater movement tags that she could conduct the operation herself. “I love the science side of it,” she says.

Juergen is the biggest crocodile the team has ever trapped, an armoured behemoth with a sinister prehistoric growl – a bubbling and gassy lava pit in the depths of hell – that suggests self-awareness of its untouchable status as Earth’s largest terrestrial predator.

Juergen’s blood has been tested. The telemetric “ping” tracker that was placed inside his thick skin this time last year has been registered and Franklin is a little closer to finding out where these mysterious creatures go at night, what they eat, what they need to survive, how vital they are to the ecosystem, what they can tell us about our long-distant past and our precarious present.

Juergen’s free to go. Catching is easy; releasing is hard, and terrifying for the uninitiated. It’s a heart-racing nerve test as a predator the size of a large sofa creeps freely and slowly out of an open rope trap. Two of the team’s lead crocodile handlers, Toby Millyard and Stuart Gudgeon, cautiously circle the hulking beast like gladiators armed only with long bamboo sticks to gently direct Juergen towards the river. There’s a distinct tremor in Millyard’s voice as he hollers a warning to his support crew of six zoo workers: “OK, everybody back up, this is when he could go absolutely anywhere. Nobody turn their back on it.”

The crocodile pauses. “He’s building up energy,” Bindi whispers. “He’s getting ready to thrash. So the guys have to be careful because he can headshake and his head is like one big chunk of steel. Dad caught a crocodile years and years ago. It came back on us. He came our way. We were running through tall grass, no idea where it went, running and running. It just turned.”

She remembers her dad in this world. She remembers carrying his knife belt. She remembers him holding her little brother in his arms. She sometimes stares at Robert and marvels at how much he resembles her dad. His mannerisms, his speech, his recklessness, his courage, his tenderness. She loves Robert more than life itself. But they sometimes butt heads, like any brother and sister. Last night her mum told her that if she can get along with her brother she will be well prepared for marriage because the key to a happy marriage is learning not to torture the one you love the most.

She looks at Terri. White denim jeans, khaki shirt, long brown hair with a fringe; she stands five metres from the crocodile’s head, her legs weighted for quick movement, one eye on the beast, one eye on her children. When Bindi was eight, nine, 10 years old she’d wander into her mum’s room at night, curl up in her arms and ask her to tell a story about her dad. Adults tell her time heals all wounds but she doesn’t believe that; or at least thinks those adults are referring to time frames longer than seven years.

“Dad was the strong one in the family,” she says. “It was hard to process that. The strongest one died. Wait, how does that work?

“You know, to lose someone like that, it’s kind of like losing a part of your heart,” she says. “You’re never going to get that back. That’s just a fact of life.”

Not long ago a young girl – a fan of Bindi’s globally syndicated kids’ wildlife TV shows and her big-budget Hollywood movies like Free Willy: Escape from Pirate’s Cove andReturn to Nim’s Island – approached her with a soft-voiced question: “How did you cope?” She copes through a single thought: that everybody says goodbye in their own way. “We spent a month catching crocodiles with Dad,” she says. “That was our goodbye, that whole month we spent with him before he died. We’d go out in the afternoon and sit in the dinghy and watch fruit bats go over us as the sun was setting.”

Her mum often has dreams about her dad. The dreams always take place in mundane domestic settings. Steve’s still alive and they’re talking like everyday parents about their children, their day. The dreams feel so real, so normal, that when she wakes she is hit once more with the gut-punch of loss.

Her mum doesn’t date. She hasn’t tried to fall in love again. Terri puts it like this: “I kind of feel like I already had my ‘happily ever after’ and I’m almost living another life.” Her life is devoted to her children and her business, Australia Zoo. When she shakes your hand she says: “I’m sorry if I smell like snake wee.”

She calls this disappearing. There are days when she has to take her children away from it all, from the zoo, from business, from TV, from make-up, from praise, from criticism. She knows what’s out there. Public life has positives and negatives. She never has to explain to strangers why her children don’t have a dad but she does have to filter abusive messages on her daughter’s Twitter account. She knows she divides opinion. She knows there are people out there who criticise the way she’s chosen to raise her kids but nobody questions her more than she questions herself. “Everyone can have an opinion,” she says. “I’m not gonna get bogged down in whether or not someone thinks what we’re doing is right or wrong. We all think we’re screw-ups to a certain degree as parents. We’re all trying our best. That’s what I’m doing. But I reckon it’s about just loving your kids.”

She turns 50 next year. She’s been asking herself lately: “How many more years, really, can I fly through the air and land on a croc?” These trips to Cape York are as much about science as they are about legacy, about knowledge transfer. It’s a pilgrimage. Bindi’s dad is here, in the gentle river, in the sounds of the brolgas flying above their heads, in their stories.

“Steve lived his whole life for this kind of research,” Terri says. “It’s not going to stop. As long as my legs work I won’t stop. There’s no research project that has funding in perpetuity. I want to be that research project.” Over 10 years she estimates she’s poured $3 million into this research. She will go broke to ensure it continues. She will lose everything to keep it going because, she says, the whole surreal “crikey” Crocodile Hunter dream was only ever about spreading a better understanding of animals. “It’s always been about the science,” she says. “But formal science makes boring television.”

Juergen sticks his head out of the trap net. “Let’s be real careful not to upset him guys,” Terri says. He turns his head left and spots the water. Then, unexpectedly, he arcs his neck right, towards his audience, causing a ripple of disquiet through the team. Bindi silently pulls Robert two more steps back into the scrub lining the riverbank. Heartbeats. Thumping heartbeats. Then the crocodile shifts left and shuffles into the river. Deep inhale. Long exhale. “Well done,” Terri hollers.

The research team busily resets the crocodile trap, dropping sandbag weights and rebuilding a makeshift natural entry out of found logs.

Robert runs off towards the team’s tin boats tied to trees at the riverbank. He swings on tree limbs, leaps over rocks, sings a few random lines of Gangnam Style. Bindi and Terri watch him fall and crash and dance in dust. “Dad would have loved this,” Bindi says.

A sign is stuck to the unisex toilet saying “Neanderthal wees” are encouraged for men to save on camp water. Campsite cooks prepare Wenlock River barramundi pancakes. Kettles boil on the campsite stove. Team members make toasted jaffle sandwiches from last night’s chicken curry. A heavy branch drops from a towering tree and lands near the communal campfire square. A found snake sleeps in a green drawstring bag on the dinner table. At the ping-pong table, Robert attempts to better his record of 18 consecutive backhand returns.

Franklin quietly approaches Terri, who is resting in an armchair and checking messages on her phone. He bears bad news. He’s just been informed Queensland’s Newman government intends to remove crocodiles, regardless of size, from the northern bank of Trinity Inlet in Cairns to Ellis Beach, about 50km north, taking in the Barron River where, six days from now, on September 3, a 2.5m crocodile will be trapped by government rangers.

State environment minister Andrew Powell will put a public call out to “private contractors” to commit to the 12-month crocodile removal trial as part of the state’s crocodile management plan. “While this is crocodile habitat, it is also an area where 160,000 people live and tourists come to visit,” Powell says. Under the plan, crocodiles will be “captured, trapped or harpooned” depending on the animal’s size and behaviour: “All crocodiles removed from the wild are placed in a zoo or crocodile farm or, in some cases, humanely euthanised”.

The Cairns Post will run a headline: “Calling all croc wranglers to Cairns”. The Queensland government has declared open season on Cairns crocodiles. “There’s plenty of room for crocodiles in North Queensland but not in or near waters frequented by numbers of people, especially children and tourists who are not crocodile savvy,” says the Member for Barron River, Michael Trout. “The ever-present threat of crocodiles has been a constant source of concern for the parents of surf lifesaving nippers. This will be a big task, which is why we are asking private operators to help us make our waterways safer.”

Franklin walks into the campsite’s makeshift IT room, a mess of power boards, camera chargers and laptops. He immediately sends an email to Powell. Last year he brought Powell to the Steve Irwin Wildlife Reserve to give him a first-hand insight into crocodile behaviour and their critical role in stabilising the ecosystems of North Queensland. He wants no association with this decision. “With your course of action,” he writes, “my belief is that, regrettably, an attack will happen at some time in the future given that the general public and tourists will be led to the false belief that you can swim in crocodile habitat.”

Franklin is as dumbfounded as he is gutted. “It will probably be some unfortunate tourist who heard about ‘Proactive Removal Zones’ in Cairns and who believes it is safe to swim in the Daintree River,” he says. “It’s a mixed message. Education is everything.

“I went through this with him last year. I sat him down. I went through all our discoveries. I showed him why you will never be able to guarantee that you will exclude crocodiles from a crocodile habitat. It’s very difficult to patrol 60km of water and that’s the area of water you need to cover to ensure an animal doesn’t swim in there. You won’t pick up every animal. They can spend 70 per cent of their day underwater. You will never know how many crocodiles are actually there.”

Terri rubs her temples. “It makes my head hurt,” she says. “There you go. The writing is on the wall. It will be the next community, the next river, the next town and then … ” She shakes her head, not wanting to voice her next thought.

Her daughter voices it for her. “There goes the species,” Bindi says.

“There’s always been crocs there and there will always be crocs there,” Terri says. “Only now you’re completely disrupting the balance. You’re making things truly dangerous. And it’s ultimately not going to change anything except people won’t see the crocodiles as much. Which is phenomenally dangerous. How gut-wrenchingly sad will it be if some kid gets taken because someone decided we had a croc-free zone?”

Bindi rests a hand on her mum’s shoulder. For the past seven years she has watched her mother fulfilling her dad’s dream on this wildlife reserve. Each year she’s watched that dream grow more endangered. She has learnt the hard way that nothing lasts forever. The Irwins can withstand anything except the march of time.

There are 154 native birds on this reserve, 43 reptile species, 18 amphibious species, 15 mammals and 43 freshwater fish species. There’s a rare palm on the edge of the Wenlock River that takes 60 years to grow out of its surrounding tropical tree canopy and find the sun. It flowers briefly, only once in its life, and dies.

In October last year, the Queensland government declared bauxite mining company Cape Alumina’s long-planned Pisolite Hills mine and port project – located between 2.8km and 15km from the Wenlock – a “significant project for which an environmental impact statement is required”. The company expects the project to boost Queensland’s economic activity by $1.2 billion, $600 million in Far North Queensland alone. It expects to create 1700 jobs over the course of the mine’s 15-year life, a boon for local indigenous communities. Subject to permits, Cape Alumina expects to be in production by 2015. Terri believes the project will threaten vital natural springs on the reserve and in turn the reserve’s unique biodiversity: “Removing any bauxite from this plateau would destroy the springs, rainforest, a previously undescribed ecosystem, and affect countless species right through the Wenlock River.”

Cape Alumina’s managing director, Graeme Sherlock, says he “agrees with Mrs Irwin that the small, perennial springs on western Cape York have environmental values that should be protected”. The company has identified more than 150 of these springs on western Cape York, of which fewer than 10 per cent occur within the project area. It says it will maintain “extensive buffer zones” around them.

It’s cold comfort for Terri. When they first arrived at Stone’s Crossing this year, pulled up at the glorious river crossing that provides access to the reserve local bushies call “Steve’s Place”, Terri turned to Bindi with a grim smile: “Well, another year the place is safe”.

They drive to Stone’s Crossing now. Bindi sits in the middle seat of a road-rocking LandCruiser. Robert bounces in the rear seats behind her. They drive through the reserve’s colourful acres of plant life, through rare floral wonders from which Griffith University scientists have been collecting samples for experiments in natural compounds to combat everything from cancer to malaria to TB. The reserve is a global research go-to zone. There are scientists from around the world conducting research here on bird-eating tarantulas, rare ground lillies, palm cockatoos, speartooth sharks.

Bindi looks out her window. “If there was one thing losing Dad taught me it’s that life is fragile,” she says. “You might be here one day and the next you might be gone. I felt that with Dad. It was like Dad was a hurricane. He really had this sense of urgency about him. Because he knew, I think.”

She nods, slowly forming the words in her head. “At some level, he knew he wasn’t going to be here long. So he’d always try and do everything he could right now. And looking back, I can see why. I mean, he didn’t have that long. I don’t know how long I have. I might have 80 years. I might have 20 years. I want to carry on in Dad’s footsteps. As I get older, I’d love to start tackling bigger issues. I’m going to take that time I’m given and use it wisely and use it all.”

The Irwins pile out of the LandCruiser at Stone’s Crossing, where clear water rushes over river boulders so smooth and round they look like ten-pin bowling balls. Robert spots a sloping sand dune along the riverbank. “Mum, can I jump off that?” he asks. She nods her head, reluctantly. The boy doesn’t stop moving. His interest in the world is insatiable. He wants to touch it, hold it, bury himself in it. “Hey Mum,” he says, two fists clenched at his chest in enthusiasm. “I’ve created a new word. It’s a mix between ‘awesome’ and ‘great’: ‘Awe-reat’.”

He launches himself off the dune. He shows his mum a tree-climbing caterpillar rash running up the insides of his forearms, doesn’t give it a second thought. “Hey Mum,” he says. “I think I want to buy a Canon camera.” He’s saving up to buy a professional camera for wildlife photography. “I have to save up $365.”

Bindi and Robert walk along a sandbank where they spot a slide mark indicating the presence of a croc roughly two metres long. Terri watches her children exploring the waters for signs. It’s a quiet moment; just the sound of the river. “I miss Steve every day,” she says. “I’m lonely. But I’m not afraid of being alone because I’m with Bindi and Robert. Before I met Steve, I’d always figured my lot in life was being the crazy spinster woman up on the block doing wildlife work.” Her children wrestle and hug on the sandbank. “What we had was very special,” she says. “I’m very grateful for it. Even if I’d known how it would end, I’d do it all again.”

Terri walks up to her children and they explore the crocodile slide-marks together. “I reckon that’s a 10-footer,” Robert says. Terri nods. “Looks recent,” Bindi says.

“Oh, that’s recent,” says her mum.

Oct 032013
 

Original story at Australia Network News

A new study on vulnerable koala populations has found the Australian icon could struggle to survive rising temperatures.
Female koala and joey. The University of Sydney research shows the need for an urgent rethink of koala management and conservation. Photo: Dan Lunney

Female koala and joey. The University of Sydney research shows the need for an urgent rethink of koala management and conservation. Photo: Dan Lunney

Research by a team at The University of Sydney has found the popular notion that koalas feed on and live in eucalyptus trees is a misconception.

The researchers say throughout the day koalas choose trees to forage for food and different trees with a more dense foliage to survive high daytime temperatures.

Dr Mathew Crowther, who led the study, says koalas need a combination of both the right kind of shelter trees and food trees to survive.

“Our research confirmed koalas shelter during the day in different types of trees to the eucalypts they feed on at night,” he said.

“We found the hotter it is during the day the more koalas will tend to seek out bigger trees with denser foliage to try to escape those temperatures.”

Dr Crowther says making sure a habitat has enough trees for koalas to feed from and protecting them from predators is not enough to ensure their survival.

The University of Sydney study tracked 40 koalas on farmland around Gunnedah in north-western New South Wales, over a three year period.

Dr Crowther says the results of the research call for a change in the management and conservation of koalas.

“One quarter of the koalas we studied perished in a heatwave in 2009 and Australia has just experienced the hottest year since climate records began,” he said.

With temperatures increasing, without more help koalas could really start to feel the heat.

“The lack of understanding of the importance of shelter trees for koalas is particularly concerning given the increasing frequency of extreme weather events,” Dr Crowther said.

“Exposure to prolonged high temperatures can result in heat stress, dehydration and eventually death.”