Body size governs predator-prey interactions, which in turn structure populations, communities, and food webs. However, information on piscivore-prey size relationships is limited. We quantified predator-prey length relationships for Crappies, Largemouth Bass, Muskellunge, Northern Pike, Rock Bass, Smallmouth Bass, and Walleye in Gaeta et al. (in review). We evaluated more than 23,000 prey fish consumed by nearly 8,000 piscivores using diet data collected during 1976-2013 from Illinois, Minnesota, New York, Wisconsin, and Alberta. We used these findings to develop a web tool (see below) for anglers, managers, researchers, and modelers to use in numerous predator-prey evaluations such as the most common prey fish size a predator consumes, thresholds of stocking length to surpass a predator population’s gape limit, or individual-based bioenergetics analyses quantifying size structure of consumed prey.
The methods are open access (free to download) in Gaeta et al. (2018):
Gaeta, J.W., Ahrenstorff, T.D., Diana, J.S., Fetzer, W.W., Jones, T.S., Lawson, Z.J., McInerny, M.C., Santucci, V.J., and Vander Zanden, J.M. (2018). Go big or … don’t? A field-based diet evaluation of freshwater piscivore and prey fish size relationships. PlosOne 13(3): e0194092. https://doi.org/10.1371/journal.pone.0194092
Please refer this user guide for web tool details.