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• W2127774037 abstract "1 Many classical models of ungulate foraging are premised on energy maximization, yet limited empirical evidence and untested currency assumptions make the choice of currency a non-trivial issue. The primary constraints on forage intake of ungulates are forage quality and availability. Using a model that incorporates these two constraints, we predicted the optimal biomass of forage patches for ungulate grazers using an energy maximizing vs. a time minimizing strategy. 2 We tested these predictions on wood bison (Bison bison athabascae Rhoads) grazing naturally occurring sedge (Carex atherodes Spreng). The digestive constraint was determined by a series of ad libitum feeding trials using sedge at different stages of growth. Sedge digestibility declined with biomass. Ad libitum intake of sedge by bison declined with sedge digestibility and thus decreased with sedge biomass. On the other hand, short-term sedge intake rates of wood bison increased with biomass. 3 Incorporation of these constraints resulted in the prediction that daily energy gain of bison should be maximized by grazing patches with a biomass of 10 g m−2, whereas a bison could minimize daily foraging time needed to fulfil its energy requirement by cropping patches with a biomass of 279 g m−2. 4 To test these quantitative predictions, we used a staggered mowing regime to convert even-aged stands of sedge to a mosaic of patches varying in quality and quantity. Observations of bison grazing these mosaics indicated that patches of biomass below 120 g m−2 were avoided, while patches of biomass 156 and 219 g m−2 were highly preferred, with the greatest preference for the latter. 5 These results indicate that bison were behaving as time minimizers rather than energy maximizers. Daily cropping times of free-ranging bison from the literature corroborate our results." @default.
• W2127774037 created "2016-06-24" @default.
• W2127774037 creator A5001015436 @default.
• W2127774037 creator A5028044562 @default.
• W2127774037 creator A5069982167 @default.
• W2127774037 creator A5078101092 @default.
• W2127774037 date "2001-03-01" @default.
• W2127774037 modified "2023-10-11" @default.
• W2127774037 title "Ungulate foraging strategies: energy maximizing or time minimizing?" @default.
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• W2127774037 doi "https://doi.org/10.1111/j.1365-2656.2001.00496.x" @default.
• W2127774037 hasPublicationYear "2001" @default.
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