Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New study shows stable fisher population in the Southern Sierra Nevada

29.01.2013
After experiencing years of population decline on the West Coast, a recent study examining fisher populations found that—at least in the southern Sierra Nevada—the animal's numbers appear to be stable.

Scientists from the U.S. Forest Service's Pacific Southwest Research Station (PSW) and the Pacific Southwest Region collaborated to monitor the distribution of fishers across a 7,606-square-mile area in the southern Sierra Nevada. They used baited track-plate stations—an enclosure where the fisher leaves a sooted track print as it walks through—at 223 locations across three national forests. Over an eight-year period, from 2002-2009, they found that the fisher population in the southern Sierra Nevada neither increased nor decreased.

The findings are relatively good news for the cat-sized relative of the weasel family. The forest-dwelling fisher (Martes pennanti) once lived throughout most of the mountains in northern California and the Sierra Nevada, and in the Rocky Mountains, Cascades and Coast ranges. But many populations were eliminated or declined due to commercial trapping and clear-cut timber harvesting. Fishers have been reintroduced at a few locations in the western U.S., but only two native populations—both centered in California—remain. The small population of fishers in the southern Sierra has been estimated, by other methods, to be approximately 250 individuals.

"This study is encouraging in that it demonstrates that we can monitor a fisher population over a large area, with simple methods," said Bill Zielinski, a PSW research ecologist who coordinated the analysis of the research data. "It is also encouraging that we did not discover a decreasing trend in the population, but eight years is a relatively short period."

Zielinski noted that given the short time period of this study, the effects of Forest Service management actions to protect fishers and their habitat cannot yet be fully assessed. Further study, over a longer time period is necessary to fully understand the efficacy of these conservation measures. Other factors unrelated to habitat, including road kill and the illegal use of rodenticides which poison the fishers, must also be considered when evaluating the population.

“We hope that we can continue to monitor the fisher, so that we can witness an increase in the population as public and private groups collaborate to institute measures to protect them from various threats,” he said.

PSW statistician James Baldwin, along with collaborators Richard Truex, Jody Tucker and Patricia Flebbe from the Pacific Southwest Region, contributed to the study. Results of the study appear in the online version of the Journal of Fish and Wildlife Management and can be viewed at: http://treesearch.fs.fed.us/pubs/42545

Headquartered in Albany, Calif., PSW develops and communicates science needed to sustain forest ecosystems and the benefits they provide to society. It has research facilities in California, Hawaii, and the U.S.-affiliated Pacific Islands. The PSW area includes the lowest, driest desert in the country, the highest elevations within the 48 contiguous States, and the wettest tropical forests. This area is the home to an abundant diversity of native plants and animals and nearly half of the nation’s threatened and endangered species.

Sherri Eng | EurekAlert!
Further information:
http://www.fs.fed.us

Further reports about: Forest Service Pacific coral forest ecosystem tropical forest

More articles from Agricultural and Forestry Science:

nachricht New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory

nachricht Mixed forests: ecologically and economically superior
09.05.2018 | Technische Universität München

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

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

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...

Im Focus: Computer-Designed Customized Regenerative Heart Valves

Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.

Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...

Im Focus: Light-induced superconductivity under high pressure

A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.

Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...

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

Supersonic waves may help electronics beat the heat

18.05.2018 | Power and Electrical Engineering

Keeping a Close Eye on Ice Loss

18.05.2018 | Information Technology

CrowdWater: An App for Flood Research

18.05.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>