2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/26/2021 | 8:30 AM - 10:30 AM | SHORT-TERM WARM AIR TEMPERATURE EXPOSURE EFFECTS ON DIAMESA (DIPTERA: CHIRONOMIDAE) LONGEVITY AND BEHAVIOR | Virtual Platform

SHORT-TERM WARM AIR TEMPERATURE EXPOSURE EFFECTS ON DIAMESA (DIPTERA: CHIRONOMIDAE) LONGEVITY AND BEHAVIOR

Diamesa species are cold-adapted non-biting midges that are an important ecological component in groundwater-fed stream ecosystems. These ecosystems may be adversely affected by climate change as average winter air temperatures increase and cause ambient temperature spikes. Adult midges were collected off the snow (n=298) from two sites on Pickwick Creek, a groundwater-fed trout stream in Winona County, MN on January 4th, 2021 to determine how short-term warm temperature exposure affects Diamesa. Control groups for both sites were incubated at constant 6°C, whereas treatment groups were exposed to 22°C for 24hrs and 48hrs. Short-term exposure to 22°C reduced the mean longevity of treatment groups at both sites (male longevity: 24hrs=14.2 and 12.9 days; 48hrs=12.4 and 11.3 days) compared to control groups (male longevity: 15.2 and 16.4 days for males). Larval hatch rate was also impacted by short-term warm temperature exposure: 67-80% of egg masses hatched at 6°C, 20-45% of egg masses hatched at 22°C for 24hrs, and 40-44% of egg masses hatched at 22°C for 48hrs at both sites. Thus, warm temperatures in winter caused by climate change could have long term effects on Diamesa populations.

Climate variability
Stream
Biological effects

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Presenters/Authors

Hannah Bodmer (), University of Minnesota, bodme006@umn.edu;