2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/20/2019 | 10:15 AM - 10:30 AM | EXPERIMENTAL EVIDENCE FOR STRONGER COMPETITION AT HIGHER ELEVATIONS: A MECHANISM FOR UPSLOPE RANGE MARGINS? | 150 DEF
EXPERIMENTAL EVIDENCE FOR STRONGER COMPETITION AT HIGHER ELEVATIONS: A MECHANISM FOR UPSLOPE RANGE MARGINS?
Species’ geographic range shifts towards higher latitudes and elevations are among the most frequently reported consequences of climate change. Consequently, there has been increased interest in understanding the mechanisms that set range margins in the first place. The Species Interaction-Abiotic Stress Hypothesis (SIASH) predicts that harsh abiotic conditions should determine range margins at high elevations and latitudes. An alternative hypothesis is that species interactions can set range boundaries at high latitudes or elevations if harsh environmental conditions increase the susceptibility of organisms to predators or competitors. This results in range margins that appear to be set by abiotic constraints, a scenario we refer to as Apparent Climatic Exclusion (ACE). We used cage experiments in ponds in the Elk Mountains, CO to test whether SIASH or ACE dynamics structure the elevational range margins of an up-slope range-shifting caddisfly Limnephilus picturatus McLachlan. We found that the strength of competition between L. picturatus and a cosmopolitan resident species, Limnephilus externus Hagen, is stronger in L. picturatus’ new subalpine habitats compared to in lower montane habitats. These results support ACE and have broad implications for the role species interactions play in setting range margins.
- Distribution
- Movement
- Wetland
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Presenters/Authors
Isaac Shepard
(), University of Maine, isaac.shepard@maine.edu;
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Scott Wissinger
(), Allegheny College, swissing@allegheny.edu;
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Brad Taylor
(), North Carolina State University Dept. of Applied Ecology; Rocky Mountain Biological Laboratory, bwtaylo3@ncsu.edu ;
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Hamish Greig
(), University of Maine, hamish.greig@maine.edu;
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