Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists find mercury threatens next generation of loons

06.03.2008
A long-term study by the Wildlife Conservation Society, the BioDiversity Research Institute, and other organizations has found and confirmed that environmental mercury—much of which comes from human-generated emissions—is impacting both the health and reproductive success of common loons in the Northeast.

The results of the 18-year study on loons—a species symbolic of northern lakes and wilderness—appear in the most recent edition of Ecotoxicology.

“This study demonstrates how top predators such as common loons can be used as the proverbial ‘canaries-in-the-coalmine’ for pollutants that concern humans as well,” said David C. Evers of the BioDiversity Research Institute and lead author of the study. “Our findings can be used to facilitate national and global decisions for regulating mercury emissions from coal-burning plants and other sources.”

The study uses data from nearly 5,500 samples of blood, feathers, and eggs collected from captured and released loons from some 80 lakes in Maine, New York, New Hampshire, and other states and provinces. The researchers made correlations between the behaviors of individual birds and their levels of methylmercury, the most toxic form of mercury that accumulates up the food chain.

Loons with high levels of mercury—about 16 percent of the adult population in the study area—were found to spend some 14 percent less time at the nest than normally behaving birds. Unattended nests have a higher rate of failure due to either chilling of the eggs or predation by minks, otters, raccoons and other egg robbers.

With behavioral observations from 1,529 loon territories between 1996 and 2005, researchers found that loon pairs with elevated mercury levels also produced 41 percent fewer fledged young than loons in lakes relatively free of mercury. Other behavioral impacts due to elevated mercury were sluggishness, resulting in decreased foraging for fish by the adults for both themselves and for chicks.

In addition to behavior, the concentration of mercury in loons has physiological impacts as well.

Researchers found that loons with high mercury loads have unevenly sized flight feathers. Birds with wing asymmetries of more than 5 percent must expend 20 percent more energy than normal birds to fly, a deficiency that may impact their ability to migrate and maintain a breeding territory.

“This study confirms what we’ve long suspected—mercury from human activities such as coal-burning power plants—is having a significant negative impact on the environment and the health of its most charismatic denizens, and potentially, to humans, too,” said Nina Schoch of the Wildlife Conservation Society’s Adirondack Program. “Thus, it becomes even more urgent for the EPA to propose effective national regulations for mercury emissions from power plants that are based on sound science.”

Although many northeastern states have implemented stringent mercury emission rules, a nationwide regulation has yet to be passed. The U.S. District Court of Appeals recently struck down the EPA’s proposed Cap-and-Trade Rule for mercury emissions from coal-fired power plants, which would have led to localized “hotspots” of mercury, a highly toxic pollutant. “The ecological impacts of mercury identified in this study illustrate the need for comprehensive, national regulations to limit mercury emissions,” added Schoch.

John Delaney | EurekAlert!
Further information:
http://www.wcs.org

More articles from Ecology, The Environment and Conservation:

nachricht Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel

nachricht Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)

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: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

Im Focus: Dozens of binaries from Milky Way's globular clusters could be detectable by LISA

Next-generation gravitational wave detector in space will complement LIGO on Earth

The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...

Im Focus: Entangled atoms shine in unison

A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.

The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

 
Latest News

Research reveals how order first appears in liquid crystals

23.05.2018 | Life Sciences

Space-like gravity weakens biochemical signals in muscle formation

23.05.2018 | Life Sciences

NIST puts the optical microscope under the microscope to achieve atomic accuracy

23.05.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>