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Article
An Empirical Model for Estimating Annual Consumption by Freshwater Fish Populations
North American Journal of Fisheries Management
  • Hongsheng Liao, Iowa State University
  • Clay L. Pierce, United States Geological Survey
  • Joe G. Larscheid, Iowa Department of Natural Resources
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-2005
DOI
10.1577/M03-213.1
Abstract
Population consumption is an important process linking predator populations to their prey resources. Simple tools are needed to enable fisheries managers to estimate population consumption. We assembled 74 individual estimates of annual consumption by freshwater fish populations and their mean annual population size, 41 of which also included estimates of mean annual biomass. The data set included 14 freshwater fish species from 10 different bodies of water. From this data set we developed two simple linear regression models predicting annual population consumption. Log-transformed population size explained 94% of the variation in log-transformed annual population consumption. Log-transformed biomass explained 98% of the variation in log-transformed annual population consumption. We quantified the accuracy of our regressions and three alternative consumption models as the mean percent difference from observed (bioenergetics-derived) estimates in a test data set. Predictions from our population-size regression matched observed consumption estimates poorly (mean percent difference = 222%). Predictions from our biomass regression matched observed consumption reasonably well (mean percent difference = 24%). The biomass regression was superior to an alternative model, similar in complexity, and comparable to two alternative models that were more complex and difficult to apply. Our biomass regression model, log10(consumption) = 0.5442 + 0.9962 · log10(biomass), will be a useful tool for fishery managers, enabling them to make reasonably accurate annual population consumption predictions from mean annual biomass estimates.
Comments

This article is from North American Journal of Fisheries Management 25 (2005): 525, doi:10.1577/M03-213.1.

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
Hongsheng Liao, Clay L. Pierce and Joe G. Larscheid. "An Empirical Model for Estimating Annual Consumption by Freshwater Fish Populations" North American Journal of Fisheries Management Vol. 25 Iss. 2 (2005) p. 525 - 532
Available at: http://works.bepress.com/clay_pierce/23/