2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/06/2017 | 9:45 AM - 10:00 AM | SEASONAL ECOLOGY OF MOTTLED SCULPIN (COTTUS BAIRDII) AND BROWN TROUT (SALMO TRUTTA) IN A COLDWATER MICHIGAN STREAM | 306C
SEASONAL ECOLOGY OF MOTTLED SCULPIN (COTTUS BAIRDII) AND BROWN TROUT (SALMO TRUTTA) IN A COLDWATER MICHIGAN STREAM
Winter is hypothesized to be harsher than other seasons for stream fishes (reduced survival, growth, movement) in temperate regions because of adverse conditions associated with low temperatures. However, few field studies have tested this hypothesis. We compared summer and winter vital rates of mottled sculpin (Cottus bairdii) and brown trout (Salmo trutta) via capture-recapture sampling in Stegman Creek, Michigan. Over two 7-week periods (July-September 2016; January-March 2017), mottled sculpin and brown trout were individually marked and recaptured via weekly electrofishing surveys. Total length, mass, location within 100-m study reach (10-m increments), and tag identification were recorded for each fish. We found that summer movement of mottled sculpin was similar to but more variable than brown trout. Estimated apparent weekly survival of mottled sculpin was lower than brown trout in summer. Weekly recapture probability was time-dependent and consistently lower for mottled sculpin, and constant for brown trout. Upon completion of winter surveys, we will compare vital rates between seasons and determine whether trends are consistent with the hypothesis of lower survival, growth, and movement during winter in temperate regions.
- C15 Population Ecology
- C29 Life Histories
- C02 Fish and Other Aquatic Vertebrates
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Presenters/Authors
Susanna LaGory
(), Purdue University, slagory@purdue.edu;
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Carl R. Ruetz III
(), Annis Water Resources Institute, Grand Valley State University, ruetzc@gvsu.edu;
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