2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 2:30 PM - 2:45 PM | LETHAL AND SUBLETHAL RESPONSES OF 2 BAETID MAYFLIES EXPOSED TO CONSTANT AND VARIABLE TEMPERATURE EXTREMES | 306C
LETHAL AND SUBLETHAL RESPONSES OF 2 BAETID MAYFLIES EXPOSED TO CONSTANT AND VARIABLE TEMPERATURE EXTREMES
Thermal effects on aquatic insect performance (survival, growth rate, development times, body size, fecundity) are well known, but the effects of diel (vs constant) temperature regimes on thermal limits for performance remain poorly understood. Laboratory experiments involved whole life cycle rearing (1st instar to adult) of two baetid mayfly species ( Neocloeon triangulifer and Cloeon dipterum ) in 6 different temperature regimes (range 14-30°C, with constant ±0.1°C or with diel cycle of ±2.5°C ). These are multivoltine species that overwinter as larvae. Responses to 18 and 22°C were nearly identical between constant and variable temperature regimes for both species. However, at 14°C, development time and degree-days to complete development were less, and development rate, growth rate and intrinsic rate of increase (r) greater at variable compared with constant. At or near the warmest temperatures (26 and 28°), performance in the variable temperature treatment generally declined relative to constant (e.g., development time and degree days were greater in the variable temperature treatment). Thus, a ±2.5° diel temperature fluctuation significantly affected mayfly performance at the cool and warm end of the thermal range.
- C29 Life Histories
- C15 Population Ecology
- C20 Climate Change
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Presenters/Authors
John Jackson
(), Stroud Water Research Center, jkjackson@stroudcenter.org;
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David Funk
(), Stroud Water Research Centrer, dfunk@stoudcenter.org;
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Bernard Sweeney
(), Stroud Water Research Center, sweeney@stroudcenter.org;
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David Buchwalter
(), North Carolina State University, david_buchwalter@ncsu.edu;
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