2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 2:00 PM - 3:30 PM | LONGEVITY OF DIAMESA MENDOTAE MUTTKOWSKI (DIPTERA: CHIRONOMIDAE) AS A FUNCTION OF AIR TEMPERATURE | Virtual Platform

LONGEVITY OF DIAMESA MENDOTAE MUTTKOWSKI (DIPTERA: CHIRONOMIDAE) AS A FUNCTION OF AIR TEMPERATURE

Diamesa mendotae is a common winter-emerging insect in streams of southeast Minnesota, and forms a substantial component of trout diets. Adults collected on the snow are cold-tolerant, depress freezing points to ~-20° C, and are long lived when incubated at -10° C or 6° C. These attributes are interpreted as adaptively beneficial, increasing time for mate-location and reproduction under harsh and unpredictable weather conditions. However, what is not understood is if, or how, warmer winter air temperatures predicted by climate change models affect longevity. Adults collected on snow (n= 1,683) from streams in 2016-2019 were incubated at 0°, 6°, 12°, 18° and room temperatures (RT, 22°-24° C) to determine longevity under controlled lab conditions. We found statistically significant reductions in mean longevity, from 30.3 days (males) and 34.2 days (females) at 0° to 3.5 days (both sexes) at RT. Although treatments do not reflect realistic winter air temperatures, they suggest increasing winter temperatures have potential to reduce longevity of Diamesa mendotae, possibly resulting in less reproductive success. These studies also represent range-finding testing protocols to be used as reference data to set more realistic test conditions in subsequent experiments.

Climate variability
Biological effects
Global change

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Presenters/Authors

Leonard C. Ferrington, Jr. (), University of Minnesota, ferri016@umn.edu;