2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/23/2019 | 9:30 AM - 9:45 AM | CHARACTERIZING LIMNOLOGICAL PARAMETERS IN KANSAS SMALL IMPOUNDMENTS ACROSS A GRADIENT OF GIZZARD SHAD DENSITIES | 250 DE

CHARACTERIZING LIMNOLOGICAL PARAMETERS IN KANSAS SMALL IMPOUNDMENTS ACROSS A GRADIENT OF GIZZARD SHAD DENSITIES

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 managing water quality issues stemming from extrinsic nutrient input. As a baseline for a gizzard shad eradication project, we compared a suite of limnological parameters across a gradient of shad densities. We anticipated high primary productivity and zooplankton communities dominated by rotifers and copepods in impoundments with high shad densities. Shad densities in 12 impoundments were estimated from standardized fall gill-net sampling between 2015-2018. Compartments of the pelagic food web in these impoundments were also sampled in June, August, and October 2017 and 2018. Spearman’s rank correlation indicated no association between shad density (gill-net CPE) and nutrient concentrations, chlorophyll a or Secchi depth, but cladoceran densities were negatively correlated with higher shad densities (? = -0.18, p = 0.013). A high degree of among-impoundment variation in environmental factors might have limited our ability to detect a relationship with shad abundance.

Lentic
Fish
Nutrients

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Presenters/Authors

Elizabeth Renner (), Kansas State University, earenner@ksu.edu;