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6/06/2017 | 2:15 PM - 2:30 PM | WHY A MAYFLY CLOEON DIPTERUM (EPHEMEROPTERA: BAETIDAE) GETS SMALLER AS TEMPERATURES WARM | 306C

WHY A MAYFLY CLOEON DIPTERUM (EPHEMEROPTERA: BAETIDAE) GETS SMALLER AS TEMPERATURES WARM

Larvae of the multivoltine mayfly Cloeon dipterum were reared from egg hatch to adult at 10 constant water temperatures ranging from 12.1° to 33.5°C. Median larval development time ranged from 13.5 to 110 d. Survivorship was greatest between 16° and 25°C (averaging about 85%) and declined to zero at 33.5°C. Thresholds for growth and development were 10.0° and 10.7°C, respectively. C. dipterum followed the “temperature size rule (TSR), with adult females being ~5X larger at 12.1° than at 31.7°C. We hypothesize that TSR is due to developmental rates increasing substantially faster than growth rates as test temperature increased toward the lethal limit. Respirometry data showed that aerobic metabolism at chronically lethal temperatures remained substantial and that as temperatures increased, so did metabolic maintenance costs for supporting higher body mass. We used our data to test the “oxygen- and capacity-limited thermal tolerance” hypothesis and results indicate that it may be more suited to explain acute thermal limits than chronic thermal limits which are more ecologically relevant. Our study suggests that C. dipterum has the potential to complete up to 5 generations per year at mid-latitudes in eastern North America.

C29 Life Histories
C15 Population Ecology
C20 Climate Change

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Presenters/Authors

Bernard Sweeney (), Stroud Water Research Center, sweeney@stroudcenter.org;