2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 10:15 AM - 10:30 AM | DYNAMIC OCCUPANCY MODELS SUGGEST PHYSIOGRAPHY INFLUENCES STREAM FISH COLONIZATION BUT NOT PERSISTENCE IN A SOUTHEASTERN RIVER BASIN | 302C
DYNAMIC OCCUPANCY MODELS SUGGEST PHYSIOGRAPHY INFLUENCES STREAM FISH COLONIZATION BUT NOT PERSISTENCE IN A SOUTHEASTERN RIVER BASIN
Many freshwater taxa have distributions that overlap multiple, distinct physiographic regions, yet relationships between physiography and demographic processes that drive metapopulation dynamics are rarely examined. We addressed physiographic influence on metapopulation dynamics using stream fishes as model organisms. We used periodic survey data from 40 southeastern U.S. streams representing three physiographic regions and fitted these data to multi-season, multi-species dynamic occupancy models to estimate colonization and persistence rates as functions of physiography and streamflow magnitude. Our modeling results suggest that stream fish colonization but not persistence is strongly governed by physiography, with estimated colonization rates considerably higher in Coastal Plain streams than in Piedmont and Blue Ridge systems. Like colonization, persistence was positively related to an index of streamflow magnitude, but the relationship between flow and persistence did not depend on physiography. Given the importance of colonization to population demography, we suggest that physiographic influences on metapopulation dynamics could be important considerations in the management and conservation of stream fishes, as well as other broadly distributed taxa.
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
- C14 Hydroecology
- S31 Moving forward in flow ecology: identifying and testing key hypotheses & C17 Bioassessment
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Presenters/Authors
Kit Wheeler
(), TN Tech University, kitwheeler@gmail.com;
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Mary Freeman
(), US Geological Survey, mcfreeman@usgs.gov;
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Seth Wenger
(), University of Georgia, sethwenger@fastmail.fm;
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Stephen Walsh
(), US Geological Survey, swalsh@usgs.gov;
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