2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 12:00 PM - 12:15 PM | INVESTIGATING INTERACTIONS BETWEEN RANGE EXPANDING AND RESIDENT PREDATORY FISHES USING MULTIPLE MODES OF INFERENCE | 306C
INVESTIGATING INTERACTIONS BETWEEN RANGE EXPANDING AND RESIDENT PREDATORY FISHES USING MULTIPLE MODES OF INFERENCE
Warm-water fish predators are expanding their northern range boundaries, establishing in Ontario lakes that were previously too cold. Co-occurrence of Smallmouth Bass (warm-water) and Walleye (cool-water) is becoming more common and is associated with reduced abundance of both species. We test for evidence of competition and predation between resident Walleye and range-expanding Bass. We use morphology to examine niche overlap across ontogeny. We also examine differences in growth and population size-distributions in lakes where these species occur separately and together. Abiotic gradients contribute to population differences making it necessary to control for environmental variation when comparing populations to investigate the impacts of biotic interactions. Morphological differences suggest that Walleye and Bass are more likely to compete as juveniles than as adults. Walleye in lakes with Bass appear to grow faster than those in lakes without Bass indicating selection for fast growth to escape gape-limited predation. Together, this evidence suggests that population demography is influenced by biotic interactions between predators during early life stages. Changes in size-distributions, however, were equivocal reflecting the complexity of understanding demographic trends across regional scales.
- C20 Climate Change
- C11 Community Ecology
- S10 Understanding and predicting the effects of climate change on lake and stream fishes
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Presenters/Authors
Karen Alofs
(), University of Michigan, kmalofs@gmail.com;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Donald Jackson
(), University of Toronto, don.jackson@utoronto.ca;
ASHA DISCLOSURE:
Financial -
Nonfinancial -