Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Shorebird numbers crash: survey alarm

11.04.2008
One of the world's great wildlife spectacles is under way across Australia: as many as two million migratory shorebirds of 36 species are gathering around Broome before an amazing 10,000-kilometre annual flight to their northern hemisphere breeding grounds.

But an alarming new study has revealed that both these migrants and Australia's one million resident shorebirds have suffered a massive collapse in numbers over the past 25 years.

A large scale aerial survey study covering the eastern third of the continent by researchers at the University of New South Wales has identified that migratory shorebirds populations there plunged by 73% between 1983 and 2006, while Australia's 15 species of resident shorebirds - such as avocets and stilts - have declined by 81%. The study is published in the scientific journal Biological Conservation.

It is the first long-term analysis of shorebird populations and health at an almost a continental scale and reveals a disturbing trend of serious long-term decline.

"This is a truly alarming result: in effect, three-quarters of eastern Australia's millions of resident and migratory shorebirds have disappeared in just one generation," says an author of the report, Professor Richard Kingsford.

"The wetlands and resting places that they rely on for food and recuperation are shrinking virtually all the way along their migration path, from Australia through Indonesia, the Philippines, Malaysia and up through Asia into China and Russia."

The study also revealed for the first time that Australia’s inland wetlands are particularly important for migratory shorebirds, along with the better-known coastal sites - such as Roebuck Bay, Port Phillip Bay, the Hunter River estuary and Hervey Bay.

Of the 10 wetlands supporting the highest number of shorebirds within survey bands across eastern Australia, eight were inland and only two coastal.

This makes shorebirds vulnerable to the effects of damming rivers and extraction of water. Four of the ten wetlands had been substantially reduced in size during the survey period.

“Loss of wetlands due to river regulation is one of the more significant contributors to this drastic decline, but it appears such a threat is largely unrecognised in Australia’s conservation plans and international agreements,” says Professor Kingsford, who co-authored the report with Silke Nebel and John Porter, of the UNSW School of Biological, Earth and Environmental Sciences.

The fact that resident shorebirds in eastern Australia have also suffered dramatic declines points to serious conservation problems within the continent, they say, and reflects the pressures on river systems such as the Murray-Darling Basin. Other shorebird populations in Australia's north and west, however, may not have declined so much.

The migratory shorebirds make an annual flight from Australia during March and April to their breeding grounds in northern China, Mongolia, Siberia and Alaska. These birds make the extraordinary journey of to 10,000 kilometres over a period of only a few weeks, some of them flying non-stop.

"Australia has international responsibilities for the conservation of these species and it has migratory bird agreements with Korea, Japan and China in place, but these do not appear to be stopping this long term decline,” Professor Kingsford says.

As the migratory shorebirds wing their way up the east coast of Asia (known as the East Asian–Australasian Flyway), they are increasingly vulnerable to many pressures.

Many are hunted but the most serious issue is the loss of their staging habitat, places they stop to recuperate during their arduous journey. Here they need build up body reserves for the next part of their journey. Sometimes, many migratory shorebirds may use a single site.

The key staging site for the migratory shorebirds leaving Australia is the Yellow Sea, where all 36 species concentrate, but the river catchments draining into the Yellow Sea host a growing population of about 600 million people in China and South Korea (about 10% of the world’s population).

“Agriculture and industry are progressively reclaiming the tidal feeding grounds of migratory shorebirds in the Yellow Sea” said Professor Kingsford. “Our international agreements relating to shorebird conservation (Ramsar Convention) the Japan-Australia Migratory Bird Agreement (JAMBA), the China-Australia Migratory Bird Agreement (CAMBA) and the Convention on the Conservation of Migratory Species of Wild Animals (Bonn Convention) do not seem to be working.”

Saemangeum, the most important shorebird site in the Yellow Sea, is being reclaimed with no apparent effort on behalf of the South Korean or Australian Government to stop it. “Australia could do better” says Kingsford.

“We need to properly recognise our international obligations for shorebirds within our shores when we decide to develop rivers and wetlands. We must try to meet our side of the bargain for their conservation if we are to influence other countries to protect their breeding and staging grounds."

Identifying and adequately protecting wetlands of high conservation value for migratory shorebirds and protect their water supply is paramount, he believes.

Worldwide, shorebird numbers are in decline. Of the 237 species with trend data, more than half are in decline, while only 8% are increasing.

Shorebirds are spectacular migratory birds, travelling almost the whole planet, from north to south. They spend half their lives in Australia and the other half breeding in Russia and China.

Richard Kingsford | EurekAlert!
Further information:
http://www.unsw.edu.au

More articles from Ecology, The Environment and Conservation:

nachricht 5000 tons of plastic released into the environment every year
12.07.2019 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

nachricht Climate impact of clouds made from airplane contrails may triple by 2050
27.06.2019 | European Geosciences Union

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: MOF@SAW: Nanoquakes and molecular sponges for weighing and separating tiny masses

Augsburg chemists and physicists report how they have succeeded in the extremely difficult separation of hydrogen and deuterium in a gas mixture.

Thanks to the Surface Acoustic Wave (SAW) technology developed here and already widely used, the University of Augsburg is internationally recognized as the...

Im Focus: Better thermal conductivity by adjusting the arrangement of atoms

Adjusting the thermal conductivity of materials is one of the challenges nanoscience is currently facing. Together with colleagues from the Netherlands and Spain, researchers from the University of Basel have shown that the atomic vibrations that determine heat generation in nanowires can be controlled through the arrangement of atoms alone. The scientists will publish the results shortly in the journal Nano Letters.

In the electronics and computer industry, components are becoming ever smaller and more powerful. However, there are problems with the heat generation. It is...

Im Focus: First-ever visualizations of electrical gating effects on electronic structure

Scientists have visualised the electronic structure in a microelectronic device for the first time, opening up opportunities for finely-tuned high performance electronic devices.

Physicists from the University of Warwick and the University of Washington have developed a technique to measure the energy and momentum of electrons in...

Im Focus: Megakaryocytes act as „bouncers“ restraining cell migration in the bone marrow

Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.

Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...

Im Focus: Artificial neural network resolves puzzles from condensed matter physics: Which is the perfect quantum theory?

For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.

Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on UV LED Technologies & Applications – ICULTA 2020 | Call for Abstracts

24.06.2019 | Event News

SEMANTiCS 2019 brings together industry leaders and data scientists in Karlsruhe

29.04.2019 | Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

 
Latest News

Hidden dynamics detected in neuronal networks

23.07.2019 | Life Sciences

Towards a light driven molecular assembler

23.07.2019 | Life Sciences

A torque on conventional magnetic wisdom

23.07.2019 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>