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Titolo:
Estimating diel, depth-specific foraging opportunities with a visual encounter rate model for pelagic piscivores
Autore:
Beauchamp, DA; Baldwin, CM; Vogel, JL; Gubala, CP;
Indirizzi:
Utah State Univ, Ctr Ecol, Dept Fisheries & Wildlife, Utah Cooperat Fisheries & Wildlife Res Unit, Logan, UT 84322 USA Utah State Univ Logan UT USA 84322 Wildlife Res Unit, Logan, UT 84322 USA Utah State Univ, Inst Nat Syst Engn, Dept Civil & Environm Engn, Utah Water Res Lab, Logan, UT 84322 USA Utah State Univ Logan UT USA 84322 tah Water Res Lab, Logan, UT 84322 USA
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
, volume: 56, anno: 1999, supplemento:, 1
pagine: 128 - 139
SICI:
0706-652X(1999)56:<128:EDDFOW>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
JUVENILE SOCKEYE-SALMON; KOKANEE ONCORHYNCHUS-NERKA; LAKE WASHINGTON; VERTICAL MIGRATION; FEEDING-BEHAVIOR; CUTTHROAT TROUT; FISH; PREY; SIZE; PRODUCTIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Beauchamp, DA Univ Washington, Sch Fisheries, Washington Cooperat Fisheries & Wildlife Res Unit, Box 357980, Seattle, WA 98195 USA Univ Washington Box 357980 Seattle WA USA 98195 WA 98195 USA
Citazione:
D.A. Beauchamp et al., "Estimating diel, depth-specific foraging opportunities with a visual encounter rate model for pelagic piscivores", CAN J FISH, 56, 1999, pp. 128-139

Abstract

We developed a visual foraging model for piscivores that predicts search volume as a function of light and turbidity. We combined this model with diel hydroacoustic measurements of depth-specific prey fish densities during summer stratification in Lake Tahoe, Lake Washington, and Strawberry Reservoir to examine differences in diel, depth-specific visual encounter rates ofprey. These study sites were selected to represent gradients of increasinglimnetic prey fish density and declining transparency. The model predictedover a 30-fold difference in maximum depth-specific diel encounter rates among the three lakes. Lake Washington, which was characterized by intermediate transparency and moderate limnetic prey density, had the highest predicted prey encounter rates. The pattern of prey encounter rates among the three lakes was similar to the proportional contribution of limnetic prey fishes observed in the diet of piscivores from these waters. This approach may be used to construct temporally and spatially explicit trophic interaction models for examining mechanisms underlying predator and prey distributions or to predict the response of existing or introduced predators to changing environmental conditions, prey abundance, or distribution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 12:24:18