Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Rising temperatures will lead to loss of trout habitat in the southern Appalachians

06.10.2006
USDA Forest Service (FS) research projects that between 53 and 97 percent of natural trout populations in the Southern Appalachians could disappear due to the warmer temperatures predicted under two different global climate circulation models.

In an article published October 2 in the online version of the Transactions of the American Fisheries Society, Patricia Flebbe, research biologist at the FS Southern Research Station unit in Blacksburg, VA, maps out trout habitat in a future, warmer climate.

The three species of trout that live in the Southern Appalachians--native brook and the introduced rainbow and brown trout --all require relatively low stream temperatures to survive. Average air temperature in the United States has increased by about 0.6º C (1o F) over the last 100 years, and is projected to increase 3 to 5ºC (5.4 to 9o F) over the next century, causing a corresponding warming of stream temperatures.

"Trout species in the Southern Appalachians are already at the southern limits of their ranges," says Flebbe. "If temperatures warm as much as predicted, trout habitat in the region will definitely shrink."

To estimate trout habitat in relation to higher temperatures, Flebbe and fellow researchers Laura Roghair from the Virginia Tech Conservation Management Institute and former FS employee Jennifer Bruggink produced a regional map of wild trout habitat based on information from stream samples, expert knowledge, and suitable land cover. They then developed a model that uses elevation and latitude as surrogates for temperature, producing spatially explicit information about how much trout habitat will be left as temperatures rise over the next 100 years.

"Estimates of how much temperature will increase in the Southern Appalachians varies according to the global circulation models used, which, in turn, affects projections of habitat loss," says Flebbe. "Using predictions from the Hadley Centre, about 53 percent of trout habitat would be lost over the next century. Under the more extreme model from the Canadian Centre, 97 percent would be lost."

Trout habitat in the Southern Appalachians is already fragmented due to land use change, road building, channelization, and other disturbances. Under both temperature change scenarios, this fragmentation would increase. "As the remaining habitat for trout becomes more fragmented, only small refuges in headwater streams at the highest levels will remain," says Flebbe. "Small populations in isolated patches can be easily lost, and in a warmer climate, could simply die out."

"Although all three of these trout species will probably remain viable in other parts of their range, the world could lose the brook trout strain unique to the region," she adds. "And, as a result, trout fishing in the Southern Appalachians may become a heavily managed experience."

Patricia Flebbe | EurekAlert!
Further information:
http://www.srs.fs.usda.gov/pubs/24607
http://www.srs.fs.usda.gov/

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: Attoseconds break into atomic interior

A newly developed laser technology has enabled physicists in the Laboratory for Attosecond Physics (jointly run by LMU Munich and the Max Planck Institute of Quantum Optics) to generate attosecond bursts of high-energy photons of unprecedented intensity. This has made it possible to observe the interaction of multiple photons in a single such pulse with electrons in the inner orbital shell of an atom.

In order to observe the ultrafast electron motion in the inner shells of atoms with short light pulses, the pulses must not only be ultrashort, but very...

Im Focus: Good vibrations feel the force

A group of researchers led by Andrea Cavalleri at the Max Planck Institute for Structure and Dynamics of Matter (MPSD) in Hamburg has demonstrated a new method enabling precise measurements of the interatomic forces that hold crystalline solids together. The paper Probing the Interatomic Potential of Solids by Strong-Field Nonlinear Phononics, published online in Nature, explains how a terahertz-frequency laser pulse can drive very large deformations of the crystal.

By measuring the highly unusual atomic trajectories under extreme electromagnetic transients, the MPSD group could reconstruct how rigid the atomic bonds are...

Im Focus: Developing reliable quantum computers

International research team makes important step on the path to solving certification problems

Quantum computers may one day solve algorithmic problems which even the biggest supercomputers today can’t manage. But how do you test a quantum computer to...

Im Focus: In best circles: First integrated circuit from self-assembled polymer

For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.

In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Basque researchers turn light upside down

23.02.2018 | Physics and Astronomy

Finnish research group discovers a new immune system regulator

23.02.2018 | Health and Medicine

Attoseconds break into atomic interior

23.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>