2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 2:15 PM - 2:30 PM | EXPERIMENTAL STREAM WARMING EFFECTS ON MAYFLY GROWTH RATES ACROSS ELEVATION GRADIENTS: A TEMPERATE-TROPICAL COMPARISON | 306B
EXPERIMENTAL STREAM WARMING EFFECTS ON MAYFLY GROWTH RATES ACROSS ELEVATION GRADIENTS: A TEMPERATE-TROPICAL COMPARISON
Climate change is anticipated to impact ecosystems worldwide, yet there is little consensus about how this impact will differ across temperate and tropical ecosystems. The Climate Variability Hypothesis predicts that organisms in temperate regions, which experience seasonal temperature fluctuations, will be less vulnerable to warming compared to their tropical counterparts, where temperatures are more stable. To understand how aquatic organisms respond to stream warming, we used streamside mesocosms to measure growth rates in Baetidae mayflies under elevated temperatures (relative to ambient) in both the Colorado Rockies and the Ecuadorian Andes. Warming effects followed expectations, temperate populations showed faster growth rates at higher temperatures in low elevation, while high elevation Baetidae had the fastest growth rates at low temperature. Overall mayfly growth rates were higher in Colorado than in Ecuador (at similar temperatures). In tropical populations increasing temperature of high elevation Baetidae did not lead to faster growth rates, but did increase mortality rates. These results suggest differential metabolic thresholds for tropical vs temperate mayflies and suggest that tropical populations may be more vulnerable to climate change than their temperate counterparts.
- C20 Climate Change
- C22 Disturbance
- S09 The importance of environmental gradients for the advance of tropical stream ecology
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Presenters/Authors
Andrea Landeira-Dabarca
(), Universidad San Francisco de Quito, andrealandab@gmail.com;
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Amanda Rugenski
(), University of Georgia, atrugenski@gmail.com;
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Carla L. Atkinson
(), University of Alabama, carlalatkinson@gmail.com;
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Steven Thomas
(), School of Natural Resources, University of Nebraska-Lincoln, Lincoln, sthomas5@unl.edu;
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Andrea C. Encalada
(), Instituto BIOSFERA, Universidad San Francisco de Quito, Cumbayá, Ecuador Biológicas y Ambientales, Universidad San Francisco de Quito, Cumbaya, Ecuador, aencalada@usfq.edu.ec;
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LeRoy Poff
(), Colorado State University, n.poff@rams.colostate.edu;
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Alexander Flecker
(), Cornell University, Ithaca, NY, USA, asf3@cornell.edu;
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