Shoreline development and growth of largemouth bass (Micropterus salmoides): a cross-lakes comparison

Poster Number: 
247
Presenter/Primary Author: 
Jereme Gaeta
Co-Authors: 
Matthew J. Guarascio
Co-Authors: 
Greg G. Sass
Co-Authors: 
Stephen R. Carpenter

Lakeshore residential development is associated with decreases in riparian zone vegetation and littoral zone structure, and increased angling effort. Depending upon the species and their associated body size, fishes may respond differently to these changes. Responses may be particularly difficult to predict for species that undergo marked changes in habitat use and diet over ontogeny, such as the popular sportfish largemouth bass (Micropterus salmoides). To test for a relationship among shoreline development and largemouth bass growth across ontogeny, we compared largemouth bass size-specific growth rates across 16 lakes that span the regional range of shoreline development (0 to 45.8 buildings km -1) in Wisconsin’s Northern Highland Lake District. Using a longitudinal multilevel model, the relationship between shoreline development and largemouth bass growth was identified and related to body size. Largemouth bass growth rates were positively correlated with shoreline development for fish smaller than 164 mm and were negatively correlated for larger sizes. While we cannot infer mechanism from our study, we believe the relationship between shoreline development and largemouth bass growth is likely the result of angling-induced behavioral changes or angling-induced selection pressure.

Student Poster: 
Yes