EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/06/2017 | 9:00 AM - 9:15 AM | STREAM DRYING AND FISH METAPOPULATION DYNAMICS IN THE ICHAWAYNOCHAWAY CREEK BASIN, SOUTHWEST GA | 306C
STREAM DRYING AND FISH METAPOPULATION DYNAMICS IN THE ICHAWAYNOCHAWAY CREEK BASIN, SOUTHWEST GA
Disturbances including stream drying are natural processes, and native species generally have adaptations that allow them to persist or recover. However, the point at which natural or anthropogenic disturbances exceed a community’s ability to recover is not well understood. We studied assemblage composition and metapopulation dynamics of small-bodied fish species at 19 sites in 15 streams in the Ichawaynochaway Creek basin, southwestern Georgia, to ask whether faunal composition differs between perennial streams and those that now exhibit periods of flow cessation or channel drying. Species composition was similar across sites, which shared 31 out of 41 observed species. However, species relative abundances differed dramatically, with the five most abundant species (accounting for > 80% of individuals) in intermittent sites being relatively rare at perennial sites. Fishes showed high colonization rates at the intermittent sites when streamflow declined forming isolated pools, followed by high persistence by the numerically dominant species. We also observed re-colonization following resumption of flow when channels had dried completely. Our observations provide a basis for predicting changes in stream fish assemblages given conditions of increased stream intermittency.
- C22 Disturbance
- S10 Understanding and predicting the effects of climate change on lake and stream fishes
- C02 Fish and Other Aquatic Vertebrates
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Presenters/Authors
Jessica Davis
(), University of Georgia, Athens, JessicaLdavis17@gmail.com;
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Mary Freeman
(), US Geological Survey, mcfreeman@usgs.gov;
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Stephen Golladay
(), The Jones Center at Ichauway, steve.golladay@jonesctr.org;
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