Modeling Habitat Selection of a Top Predator: Considering Growth and Physical Environments in a Spatial Context

Autor: Elizabeth A. Marschall, R. Scott Hale, D. Derek Aday, Jonathan C. Sieber Denlinger, Cassandra J. May
Rok vydání: 2012
Předmět:
Zdroj: Transactions of the American Fisheries Society. 141:215-223
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2012.655122
Popis: Mechanisms associated with habitat selection by fishes are often unknown and require both physical habitat and growth environment considerations. We used spatially explicit prey biomass estimates, predator growth rate potential (GRP), bottom slope, predator distance from shore, and substrate data to predict habitat use of the saugeye (walleye Sander vitreus × sauger S. canadensis), a popular sport fish that is stocked throughout the central United States. We used telemetry to determine saugeye locations, acoustics to estimate prey biomass and distributions, and a bioenergetics model to aid in calculation of GRP. Akaike's information criterion was used to determine which habitat variables were most important in explaining saugeye location. Models that included both physical habitat and either GRP or prey density performed better than models that considered only one of these parameter types. The resulting models provided the data to create location suitability maps. In general, saugeyes favored ste...
Databáze: OpenAIRE
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