ScienceDaily 28 Jul 09;
Governments must act urgently to halt loss of habitats and invading species that are posing major threats to biodiversity and causing species extinctions across Australia, New Zealand and the Pacific Islands, according to a landmark new study.
Published in the international journal Conservation Biology, the report is the first comprehensive review of more than 24,000 scientific publications related to conservation in the Oceanic region. Compiled by a team of 14 scientists, it reveals a sorry and worsening picture of habitat destruction and species loss. It also describes the deficiencies of and opportunities for governmental action to lessen this mounting regional and global problem.
"Earth is experiencing its sixth great extinction event and the new report reveals that this threat is advancing on six major fronts," says the report's lead author, Professor Richard Kingsford of the University of New South Wales.
"Our region has the notorious distinction of having possibly the worst extinction record on earth. This is predicted to continue without serious changes to the way we conserve our environments and dependent organisms. We have an amazing natural environment in our part of the world but so much of it is being destroyed before our eyes. Species are being threatened by habitat loss and degradation, invasive species, climate change, overexploitation, pollution and wildlife disease."
Threats in Oceania
* Loss and degradation of habitat is the largest single threat to land species, including 80 percent of threatened species.
* More than 1,200 bird species have become extinct in the Pacific islands and archipelagos.
* In Australia agriculture has modified or destroyed about 50 percent of woodland and forest ecosystems, and about 70 percent of remaining forests are ecologically degraded from logging.
* Invasive species, particularly vertebrates and vascular plants, have devastated terrestrial species of the Pacific Islands and caused 75 percent of all terrestrial vertebrate extinctions on oceanic islands.
* More than 2,500 invasive plants have colonized New Zealand and Australia – representing about 11 percent of native plant species.
* Many invasive weeds, vertebrate pests, and fishes were introduced by government, agriculturalists, horticulturalists and hunters.
Species deceases: global snapshot
* Nearly 17,000 of the world's 45,000 assessed species are threatened with extinction (38 percent). Of these, 3,246 are in the highest category of threat, Critically Endangered, 4,770 are Endangered and 8,912 are Vulnerable to extinction.
* Nearly 5,500 animal species are known to be threatened with extinction and at least 1,141 of the 5,487 known mammal species are threatened worldwide.
* In 2008, nearly 450 mammals were listed as Endangered, including the Tasmanian Devil (Sarcophilus harrisii), after the global population declined by more than 60 percent in the last 10 years.
* Scientists have catalogued relatively little about the rest of the world's fauna: only 5 percent of fish, 6 percent of reptiles, and 7 percent of amphibians have been evaluated. Of those studied, at least 750 fish species, 290 reptiles, and 150 amphibians are at risk.
* The average extinction rate is now some 1,000 to 10,000 times faster than the rate that prevailed over the past 60 million years.
"Many people are just beginning to understand the full extent of these problems in terms of land-clearing, degradation of rivers, pest species and overfishing," says Professor Kingsford. "Climate change is a very important issue but by no means the only threat to biodiversity. The biggest problem seems to be that the policy challenges are just not being taken up by governments. Conservation policies are just seen as a problem for the economy."
For each of the major threats to biodiversity and conservation, the scientific team has proposed between three and five specific policy recommendations that should be adopted by governments around the region.
Many of these broad policies are being implemented but in a piecemeal way. For example, the scientists recommend setting targets for protected areas such as National Parks of at least 10 percent of terrestrial areas and up to 50 percent of marine areas but these may not be enough.
Dr James Watson, President of the Society for Conservation Biology and an author of the report, says: "There is a need for commitment to more protected areas and more effort into rehabilitation of major threatened ecosystems such wetlands."
The report's authors are particularly concerned about the impacts of destructive fisheries and the effects of by-catch from long-line fishing, bottom trawling, cyanide and explosive use in some Pacific nations.
"Our recommendations have clearly identified the need for more restrictions on harvesting and better ecosystem management of fisheries," says Professor Kingsford. "There is a real need to have better international mechanisms for protecting against unsustainable fisheries." Of particular importance is the overwhelming impact of burgeoning human populations in the region on the environment. Populations are set to increase significantly by 2050; for example Australia 35%; New Zealand 25%; Papua New Guinea 76%; New Caledonia 49%.
"The burden on the environment is going to get worse unless we are a lot smarter about reducing our footprint on the planet or the human population," says Professor Kingsford. As well, many Pacific Island states have a relatively poor information base for conservation. The study found that 88.5% of all scientific studies were from Australia (53.7%), New Zealand (24.3%) and Hawaii (10.5%). In most other countries in the region, there was relatively poor capacity to inform the community about the state of the environment.
There is a real need to invest in building the scientific and government capacity for conservation throughout the region. "Unless we get this equation right, future generations will surely be paying more in terms of quality of life and the environment we live in. And our region will continue its terrible reputation of leading the world in the extinction of plants and animals," says Professor Kingsford.
Adapted from materials provided by University of New South Wales, via EurekAlert!, a service of AAAS.
Call for treaty to save Pacific species
Rosslyn Beeby, The Canberra Times 29 Jul 09
Australia is ignoring a wildlife extinction crisis on its doorstep, doing little to help Pacific nations deal with overwhelming conservation problems, a leading scientist says.
In the lead-up to the Pacific Islands Forum in Cairns next week, University of NSW ecologist Professor Richard Kingsford has called for Australia to look at drafting a regional treaty to guarantee environmental aid to developing island nations.
Despite its ''palm trees and paradise'' image, the Pacific region including Australia and New Zealand ''has the notoriety of having possibly the worst extinction record on Earth''.
More than 80 per cent of plant and animal species in eight Pacific island nations including Vanuatu, Fiji, New Caledonia, Samoa, Tonga and Hawaii are threatened by habitat loss caused by land clearing and urban development, according to a new study co-authored by Professor Kingsford.
Published today in the international journal Conservation Biology, it is the first detailed review of more than 24,000 scientific publications on conservation issues across the Pacific.
The list of environmental threats includes over-harvesting of corals, shells and tropical fish for the aquarium trade, bird diseases such as avian malaria and cholera, over-fishing, the illegal wildlife trade and the spread of root-rot fungus or die-back, which is killing forests in Western Australia.
Human activity is driving Earth's 'sixth great extinction event'
Population growth, pollution and invasive species are having a disastrous effect on species in the southern hemisphere, a major review by conservationists warns
Ian Sample, guardian.co.uk 28 Jul 09;
Earth is experiencing its "sixth great extinction event" with disease and human activity taking a devastating toll on vulnerable species, according to a major review by conservationists.
Much of the southern hemisphere is suffering particularly badly, and Australia, New Zealand and neighbouring Pacific islands may become the extinction hot spots of the world, the report warns.
Ecosystems in Polynesia, Micronesia and Melanesia need urgent and effective conservation policies, or the region's already poor record on extinctions will worsen significantly.
Researchers trawled 24,000 published reports to compile information on the native flora and fauna of Australasia and the Pacific islands, which have six of the most biodiverse regions on the planet. Their report identifies six causes driving species to extinction, almost all linked in some way to human activity.
"Our region has the notorious distinction of having possibly the worst extinction record on Earth," said Richard Kingsford, an environmental scientist at the University of New South Wales in Sydney and lead author of the report. "We have an amazing natural environment, but so much of it is being destroyed before our eyes. Species are being threatened by habitat loss and degradation, invasive species, climate change, over-exploitation, pollution and wildlife disease."
The review, published in the journal Conservation Biology, highlights destruction and degradation of ecosystems as the main threat. In Australia, agriculture has altered or destroyed half of all woodland and forests. Around 70% of the remaining forest has been damaged by logging. Loss of habitats is behind 80% of threatened species, the report claims.
Invasive animals and plants have devastated native species on many Pacific islands. The Guam Micronesian kingfisher is thought to be extinct in the wild following the introduction of the brown tree snake. The impact of invasive species is often compounded by pollution and burgeoning human populations on the islands, which have outstripped their capacity to deal with waste. Plastics and fishing gear are an ongoing danger.
The impact of humans on wildlife is likely to increase in Australasia and the Pacific islands. By 2050, the population of Australia is expected to have risen by 35%, and New Zealand by 25%, while Papua New Guinea faces a 76% increase and New Caledonia 49%.
More than 2,500 invasive plant species have colonised Australia and New Zealand, competing for sunlight and nutrients. Many have been introduced by governments, horticulturists and hunters. In addition, the report says, average temperatures in Australia have increased, in line with climate change predictions, forcing some species towards Antarctica and others to higher, cooler ground.
The report highlights several studies that point to serious threats from diseases such as avian malaria and the chytrid fungus, linked to declines in frog populations. An infectious facial cancer is spreading rapidly among Tasmanian devils and populations of the world's largest marsupial predator are believed to have fallen by more than 60% as a result.
Plants have also fared badly: a root fungus deliberately introduced into Australia has destroyed several species.
The report sets out a raft of recommendations to slow the decline by introducing laws to limit land clearing, logging and mining; restricting deliberate introduction of invasive species; reducing carbon emissions and pollution; and limiting fisheries. It raises particular concerns about bottom trawling, and the use of cyanide and dynamite, and calls for early-warning systems to pick up diseases in the wild.
"The burden on the environment is going to get worse unless we are a lot smarter about reducing our footprint," said Kingsford. "Unless we get this right, future generations will surely be paying more in quality of life and the environment. And our region will continue its terrible reputation of leading the world in the extinction of plants and animals."
Dead and buried
Cretaceous-Tertiary 65m years ago, the dinosaurs were wiped out in a mass extinction that killed nearly a fifth of land vertebrate families, 16% of marine families and nearly half of all marine animals. Thought to have been caused by asteroid impact that created Chicxulub crater in the Yucatan.
End of Triassic About 200m years ago, lava floods erupting from the central Atlantic are thought to have created lethal global warming, killing off more than a fifth of all marine families and half of marine genera.
Permian-Triassic The worst mass extinction took place 250m years ago, killing 95% of all species. Experts disagree on the cause.
Late Devonian About 360m years ago, a fifth of marine families were wiped out, alongside more than half of all marine genera. Cause unknown.
Ordovician-Silurian About 440m years ago, a quarter of all marine families were wiped out by fluctuating sea levels as glaciers formed and melted. again.
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