2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | Testing the effects of temperature and carbon quality on shredder growth, survival, consumption, and development | Virtual Platform
Testing the effects of temperature and carbon quality on shredder growth, survival, consumption, and development
Shredding insects are important consumers that determine the fate of detrital carbon (C) in streams. Shredders are vulnerable to rising stream temperatures, but detrital quality may modulate their thermal response via mechanisms that remain poorly understood. High carbon to nutrient (C:N) detritus may alleviate increased respiration costs at warmer temperatures, while low C:N detritus may relieve thermal stress. To investigate how temperature and food quality affect shredder physiology, we conducted an experiment at the Coweeta Hydrologic Lab (NC, USA). Individual stoneflies (Tallaperla sp.) were fed low (Acer) or high (Rhododendron) C:N litter in channels supplied with flowing water at 5 temperatures (ambient, +1C, +2C, +3C, +4C). We measured shredder growth, development, survival, and consumption rates over the 5-week experiment. Results from regression analyses suggest that insects in the higher temperature treatments experienced greater mortality (p<<0.01) and faster development rates (p<<0.01). Growth rates increased with temperature for insects fed Acer (p<0.05), but there was no such relationship for insects fed Rhododendron. Our results suggest that temperature may interact with food quality to alter shredder phenology and physiology. Such effects likely have implications for the fates of stream C as streams warm
- Organic matter
- Energy flows
- Stressor
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Presenters/Authors
Carolyn Cummins
(), The University of Georgia, carolynsc1225@gmail.com;
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Amy Rosemond
(), University of Georgia, rosemond@uga.edu;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Amanda Rugenski
(), University of Georgia, atrugenski@gmail.com;
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Seth Wenger
(), University of Georgia, sethwenger@fastmail.fm;
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Jonathan P. Benstead
(), The University of Alabama, jbenstead@ua.edu;
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Vlad Gulis
(), Coastal Carolina University, vgulis@coastal.edu;
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Phillip Bumpers
(), Odum School of Ecology, University of Georgia, bumpersp@gmail.com;
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Nathan Tomczyk
(), University of Georgia, nathan.tomczyk@gmail.com;
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