2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 9:00 AM - 9:15 AM | EFFECT OF STREAM PERMANENCE ON PREDATION RISK OF LOTIC CRAYFISH BY RIPARIAN AND AQUATIC PREDATORS | 305A
EFFECT OF STREAM PERMANENCE ON PREDATION RISK OF LOTIC CRAYFISH BY RIPARIAN AND AQUATIC PREDATORS
Given the importance of crayfish in stream ecosystems, gaining insight into the role of stream permanence in maintaining predator-prey interactions is critical. Our objectives were to 1) determine the influence of stream permanence and season on crayfish predation and 2) assess the role of stream permanence and crayfish density on the presence of predators, while accounting for imperfect detection. We conducted surveys of crayfish density, fish presence, mammalian scat, and environmental variables within 10 intermittent and 10 permanent streams in the Ozark Highlands. We used occupancy modeling and logistic regression to assess the relationship between predator presence, crayfish density, and environmental variables. The relative frequency of occurrence of crayfish prey was greater in permanent streams than in intermittent streams. Raccoons had the highest detection probability whereas American mink and river otter had low detection probabilities. River otter occupancy was positively associated with intermittent streams whereas centrachid, raccoon, and American mink occupancy was negatively associated with intermittent streams. Hydrologic variability associated with climate change may alter crayfish predation risk and could have widespread implications for aquatic biota and predator-prey interactions.
- C14 Hydroecology
- C25 Food Webs
- S12 Challenges, insights, and opportunities in crayfish conservation and ecology
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Presenters/Authors
Allyson Yarra
(), University of Arkansas, allysonyarra@gmail.com;
ASHA DISCLOSURE:
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Nonfinancial -
Daniel Magoulick
(), Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, danmag@uark.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -