EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 12:00 PM - 12:15 PM | INFLUENCE OF INTERANNUAL AND SEASONAL WEATHER VARIABILITY ON YOUNG-OF-THE-YEAR BROOK TROUT ABUNDANCE | 250 CF
INFLUENCE OF INTERANNUAL AND SEASONAL WEATHER VARIABILITY ON YOUNG-OF-THE-YEAR BROOK TROUT ABUNDANCE
Weather variation can have widespread effects on reproductive success, potentially altering the demographics and viability of aquatic animal populations. In streams, extreme temperatures coupled with streambed scouring during rain events can reduce survival of juvenile fish, but these mechanisms have seldom been examined over large spatial scales across years. To address this research gap, we analyzed eastern brook trout (Salvelinus fontinalis) population data collected from 2,500 streams across Pennsylvania from 2010 to 2018. Relative abundance of young-of-the-year (%YOY) brook trout was highly synchronized across state management regions in five out of nine years, suggesting that large-scale factors influence population dynamics. Next, using an information theoretic approach and 16 possible parameters, we found that %YOY is lower in years with higher spring precipitation (R2=0.15, p<0.01) and higher maximum winter temperatures (R2=0.31, p<0.0001). Specifically, YOY represented 50-75% of the catch when maximum winter temperature was less than 16ºC, compared to only 5-25% when winter temperature exceeded 22ºC. If this result is ultimately tied to high flows scouring substrate and eggs, then an increased frequency of extreme weather in the future may negatively impact Pennsylvania’s trout populations.
- Population
- Temperature
- ClimateChange
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Presenters/Authors
David J. Janetski
(), Indiana University of Pennsylvania, janetski@iup.edu;
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Lauren Prasko
(), Indiana University of Pennsylvania, l.m.prasko@iup.edu;
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David Argent
(), California University of Pennsylvania, argent@calu.edu;
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Eric Chapman
(), Western Pennsylvania Conservancy, echapman@paconserve.org;
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Christopher Grant
(), Juniata College, grantc@juniata.edu;
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Rachel Kester
(), Trout Unlimited, rkester@tu.org;
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William Kimmel
(), California University of Pennsylvania, kimmel@calu.edu;
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Kathleen Lavelle
(), Trout Unlimited, klavelle@tu.org;
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Allison Lutz
(), Trout Unlimited, allison.lutz@tu.edu;
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Jonathan Niles
(), Susquehanna University, niles@susqu.edu;
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Shawn Rummel
(), Trout Unlimited, srummel@tu.org;
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Steven Seiler
(), Lock Haven University, sseiler@lockhaven.edu;
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Robert Smith
(), Lycoming College, smithr@lycoming.edu;
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Andrew Turner
(), Clarion University, aturner@clarion.edu;
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Scott Wissinger
(), Allegheny College, swissing@allegheny.edu;
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Melvin Zimmerman
(), Lycoming College, zimmer@lycoming.edu;
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