2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 2:00 PM - 2:15 PM | VARIATION IN OXYGEN, TEMPERATURE AND FLOW IN STREAMS AND HOW THEY INFLUENCE THE BEHAVIOR OF THE GIANT SALMONFLY, PTERONARCYS CALIFORNICA (INSECTA: PLECOPTERA) | 250 AB
VARIATION IN OXYGEN, TEMPERATURE AND FLOW IN STREAMS AND HOW THEY INFLUENCE THE BEHAVIOR OF THE GIANT SALMONFLY, PTERONARCYS CALIFORNICA (INSECTA: PLECOPTERA)
Rivers are heterogenous, dynamic systems in space and time. Variation in water temperature, dissolved oxygen (DO), and flow are especially important because they interact to determine both the demand by aquatic ectotherms for oxygen and the availability of oxygen to meet that demand. Fish and benthic macroinvertebrates can become oxygen limited when flows are low or when water temperatures are high. Thus variation in temperature, DO and flow directly affects the metabolism, performance and survival of aquatic ectotherms. Despite the importance of these factors, we know little about how they vary within the substrate, where aquatic macroinvertebrates live. Furthermore, we know little about how aquatic macroinvertebrates exploit the microhabitat variation available to them. We measured spatial and temporal micro-climatic variation of DO in Montana streams and how the salmonfly, Pteronarcys californica, exhibits behavioral plasticity to exploit temperature, DO and flow micro-habitats. We also measured the tolerance of this species to different combinations of these conditions to determine critical points at which the organism becomes stressed. We infer that these points indicate conditions that are metabolically unsustainable, triggering salmonflies to seek new microhabitat refuge where conditions are more favorable.
- ClimateChange
- Conservation
- Bioassessment
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Presenters/Authors
Jackson H. Birrell
(), University of Montana, jackson.birrell@umontana.edu;
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James I. Frakes
(), University of Montana, jameson.frakes@umontana.edu;
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H. Arthur Woods
(), University of Montana, art.woods@umontana.edu;
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