2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 2:00 PM - 2:15 PM | VELOCITY, PREY-CAPTURE, AND MICROHABITAT SELECTION IN ARCTIC GRAYLING (THYMALLUS ARCTICUS) | 306C
VELOCITY, PREY-CAPTURE, AND MICROHABITAT SELECTION IN ARCTIC GRAYLING (THYMALLUS ARCTICUS)
Our knowledge of the factors affecting microhabitat selection and population size for drift feeding salmonids is incomplete. We examined the relationship between prey capture success, holding velocity, and reactive distance experimentally for three sets of resident Alaskan Arctic grayling (N1 = 13, N2 = 15, N3 = 12, NTotal = 40). Mean standard lengths of Arctic grayling (mm +/- SD) was 161.8 +/- 31.1, 184.3 +/- 18.6, and 153.2 +/- 30.8. Velocity significantly affected prey capture success in all experiments and the relationship was negative and curvilinear. Holding velocities for Arctic grayling were significantly lower than capture velocities for velocity treatments of 30 cm/s and greater (p = 0.01). Mean reactive distance in single-fish experiments averaged 39.8 cm, 40.7 cm, and 37.8 cm respectively, and was weakly and positively related to velocity. Reactive distances did not differ significantly between Experiments 1 – 3 (p = 0.38). The Grossman et al. (2002) model yielded an optimal focal-point velocity prediction of 37.2 cm/s, however focal-point velocities occupied by fish in Panguingue Creek averaged 24.3 cm/s.
- C15 Population Ecology
- C12 Conservation Ecology
- C02 Fish and Other Aquatic Vertebrates
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Presenters/Authors
Bryan Bozeman
(), Warnell School of Forestry and Natural Resources, University of Georgia, bryanbozeman@uga.edu;
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Gary Grossman
(), Warnell School Forestry & Natural Resources, University of Georgia, grossman@uga.edu;
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