2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/22/2018  |   9:30 AM - 9:45 AM   |  EVIDENCE OF THE TEMPERATURE-SIZE RULE IN CHIRONOMIDAE FROM UTQIAGVIK (BARROW), ALASKA: IMPLICATIONS FOR A WARMING ARCTIC   |  410 A

EVIDENCE OF THE TEMPERATURE-SIZE RULE IN CHIRONOMIDAE FROM UTQIAGVIK (BARROW), ALASKA: IMPLICATIONS FOR A WARMING ARCTIC

The Temperature-Size Rule (TSR) states that as temperatures rise, ectothermic organisms decrease in size. This pattern has been documented across a wide range of taxa. Under global climate change, the TSR may be important in understanding how ecosystems are changing. Here we present laboratory evidence of the TSR in Chironomidae (non-biting midges) from the rapidly-warming Arctic. We reared 12 species (N>30 of each sex) under ten controlled-temperature treatments (4º-28ºC) from late larval development through pupation to emergence of the adult fly. As these species’ life cycle durations range from one to several years, individuals spent only a small percentage of their life cycle in these controlled conditions. Nonetheless, 6 out of 12 species showed significant adult size decrease in accordance with the Temperature-Size Rule, while five species showed no trend and one species showed a positive correlation between adult size and rearing temperature. Whether these species-specific patterns will be evident in the wild as the arctic growing season becomes longer and warmer is unknown.

  • Climate Change
  • Invertebrate
  • Temperature

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Presenters/Authors

Alec Lackmann (), North Dakota State University, alec.lackmann@ndus.edu;


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Daniel McEwen (), Limnopro Aquatic Science, Inc., dan@limnopro.com;


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Malcolm Butler (), North Dakota State University, malcolm.butler@ndus.edu;


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