2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | CHARACTERIZING VARIATION IN LIMNOLOGICAL PARAMETERS TO GIZZARD SHAD INTRODUCTIONS AND ERADICATIONS IN SMALL KANSAS IMPOUNDMENTS | Virtual Platform
CHARACTERIZING VARIATION IN LIMNOLOGICAL PARAMETERS TO GIZZARD SHAD INTRODUCTIONS AND ERADICATIONS IN SMALL KANSAS IMPOUNDMENTS
Gizzard shad (Dorosoma cepedianum) are important prey for sportfish in small impoundments. However, overabundant shad create problems by depleting zooplankton and translocating nutrients from benthic detritus into the water column, compounding eutrophication. Understanding how gizzard shad regulate pelagic food webs in small impoundments may aid managers in anticipating and mitigating water quality issues stemming from extrinsic nutrient input. We measured a suite of limnological parameters in 12 small Kansas impoundments as part of a four-year gizzard shad eradication study. Shad densities in 12 impoundments were estimated from standardized fall gill-net sampling from 2010 - 2020. Compartments of the pelagic food web in these impoundments were also sampled in June, August, and October from 2017 through 2020. We fit generalized linear regression models to assess the fixed effects of lake treatment group and time (before/after shad eradication or introduction) on zooplankton and algal densities. Changes in community structure following shad removal or introduction were evaluated via non-metric multidimensional scaling and PERMANOVA. We anticipated decreases in cladoceran and copepod densities following gizzard shad introductions and increased densities of blue-green algae following shad introduction.
- Biological interactions
- Detritivore
- Nutrient cycling
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Presenters/Authors
Elizabeth Renner
(), Kansas State University, earenner@ksu.edu;
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Keith Gido
(), Kansas State University, kgido@ksu.edu;
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Ben Neely
(), Kansas Department of Wildlife, Parks and Tourism, ben.neely@ks.gov;
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Jeff Koch
(), Kansas Department of Wildlife, Parks and Tourism, jeff.koch@ks.gov;
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Connor Chance-Ossowski
(), Kansas Department of Wildlife, Parks and Tourism, connor.ossowski@ks.gov;
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