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Stream isotherm shifts from climate change and implications for distributions of ectothermic organisms


Isaak, Daniel J.; Rieman, Bruce E. 2013. Stream isotherm shifts from climate change and implications for distributions of ectothermic organisms. Global Change Biology. 19: 742-751.

doi: 10.1111/geb.12073.

Stream ecosystems are especially vulnerable to climate warming because most aquatic organisms are ectothermic and live in dendritic networks that are easily fragmented. Many bioclimatic models predict significant range contractions in stream biotas, but subsequent biological assessments have rarely been done to determine the accuracy of these predictions. Assessments are difficult because model predictions are either untestable or so imprecise that definitive answers may not be obtained within timespans relevant for effective conservation. Here, we develop the equations for calculating isotherm shift rates (ISRs) in streams that can be used to represent historic or future warming scenarios and be calibrated to individual streams using local measurements of stream temperature and slope. A set of reference equations and formulas are provided for application to most streams.

Keywords: climate change, climate velocity, distribution shift, fish, global warming, isotherm, monitoring, range contraction, stream temperature


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http://www.fs.fed.us/rm/pubs_other/rmrs_2013_isaak_d001.pdf

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Title: RMRS Other Publications: Stream isotherm shifts from climate change and implications for distributions of ectothermic organisms
Electronic Publish Date: January 31, 2013
Last Update:
January 31, 2013

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