The team examined how altered water flows caused by hydroelectric dams impact the life cycle of the foothill yellow-legged frog (Rana boylii). The frog, which lives in foothill regions from southern California to southern Oregon, completes its life cycle exclusively in riverine environments.
The species is well-adapted to predictable flow patterns that are high during the spring run-off period and low during the summer. Changes to these patterns affect the survival of eggs and tadpoles and consequently are likely to be a primary factor in limiting populations of this declining species, scientists say.
Findings from three recent research projects are published in Copeia, River Research and Applications, and Conservation Genetics. These studies revealed that R. boylii tadpoles are not strong swimmers and do not survive the high flow events that can occur during the summer months in many dammed rivers, leading to local population declines. The team tested a habitat modeling tool that is commonly used for fish, with eggs and tadpole data from R. boylii, and found that it could provide reliable predictions of habitat changes under different flow scenarios. Genetic research conducted by the team identified several isolated and unique populations at the extremes of the geographic range and also demonstrated the important role of river basins in defining relationships among populations. The combined results of this work can guide conservation planning for the species.
Managing water discharge from hydroelectric dams to mirror the environment's natural flow is ideal, but this approach may not meet the needs of human consumption and energy demands.
"To conserve riverine species, one solution may be to restore some of the key characteristics of natural flow patterns, especially the timing of high and low flow periods," says Amy Lind, wildlife biologist at the Pacific Southwest Research Station in Davis, Calif., and co-author of three recent papers on R. boylii ecology and genetics.
For more information about this research, go to a recently developed website focused on this species at: http://www.fs.fed.us/psw/topics/wildlife/herp/rana_boylii/
The team's three research papers can be found at: http://www.treesearch.fs.fed.us/pubs/37847 http://www.treesearch.fs.fed.us/pubs/37848 http://www.treesearch.fs.fed.us/pubs/37849
The Pacific Southwest Research is headquartered in Albany, Calif. The station develops and communicates science needed to sustain forest ecosystems and other benefits to society. It has laboratories and research centers in California, Hawaii and the United States-affiliated Pacific Islands. For more information, visit www.fs.fed.us/psw/.
Sherri Eng | EurekAlert!
How brains surrender to sleep
23.06.2017 | IMP - Forschungsinstitut für Molekulare Pathologie GmbH
A new technique isolates neuronal activity during memory consolidation
22.06.2017 | Spanish National Research Council (CSIC)
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
23.06.2017 | Physics and Astronomy
23.06.2017 | Physics and Astronomy
23.06.2017 | Information Technology