2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 11:30 AM - 11:45 AM | MODELING CLIMATE-DRIVEN SHIFTS IN ADULT EMERGENCE BY AN ARCTIC CHIRONOMID COMMUNITY: POTENTIAL IMPACTS ON TUNDRA INSECTIVORES | 410 A
MODELING CLIMATE-DRIVEN SHIFTS IN ADULT EMERGENCE BY AN ARCTIC CHIRONOMID COMMUNITY: POTENTIAL IMPACTS ON TUNDRA INSECTIVORES
A warming Arctic has advanced chironomid emergence in tundra ponds of northern-most Alaska by about a week, relative to the 1970s. This early-summer pulse of emerging insect biomass is a crucial food resource for tundra-nesting birds, and further climate change has potential to decouple insect/bird phenologies, threatening reproductive success of arctic-breeding insectivores. We built a simulation model predicting prey energy availability for tundra-foraging birds during the growing season at Utqiagvik (Barrow), Alaska. We based the model on allometric and kinetic assumptions inherent in metabolic activity, parameterized with data on midge community composition, species-specific emergence phenologies, and pond temperatures collected at both ends of a four-decade timespan. Our model calculates the phenological pattern and energetics of the emerging insect community by summing output for 28 chironomid taxa. A single abundant species in these ponds contributes 25% of total midge community production. By altering thaw dates and temperature regimes, we can simulate changes in the timing and magnitude of resource availability for consumers. For a shorebird species with a fixed 16-day hatch-to-fledging window, pond thaw three days earlier than average can decrease production of emerging insects available to foraging chicks by 40%.
- Climate Change
- Aquatic-terrestrial Linkage
- Life History
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Presenters/Authors
Malcolm Butler
(), North Dakota State University, malcolm.butler@ndus.edu;
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Daniel McEwen
(), Limnopro Aquatic Science, Inc., dan@limnopro.com;
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Alec Lackmann
(), North Dakota State University, alec.lackmann@ndus.edu;
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