FortinFryxellPilote2002

Reference

Fortin, D., Fryxell, J.M., Pilote, R. (2002) The temporal scale of foraging decisions in bison. Ecology, 83(4):970-982.

Abstract

Assessing the temporal scale under which gain is maximized is critical for the understanding of diet choice by animals. Classical foraging theory assumes that animals maximize long- term rates. Few studies have considered several temporal scales concurrently, however, weakening tests of rate-maximizing models. We used contingency models based on maximization of short-term vs. long-term energy intake by bison (Bison bison). Model predictions were tested against field observations conducted during six periods of 1998: two periods in the winter, one in the spring, and three in the summer. During most of the year, foraging characteristics and plant attributes suggested that intake rate of bison should be limited by ingestion time over short periods of time, and by digestive constraints over long periods of time. Diet predictions varied across temporal scales for four of the six sampling periods. Selecting Agropyron spp., rather than Carex atherodes, during these periods would result in an increase of daily energy intake by as much as 15 565 kJ (i.e., 7.4% of daily-gains) but would necessitate a longer daily foraging time. We observed, instead. that bison preferred C. atherodes to Agropyron spp., suggesting that patterns of diet selection by bison were more consistent with maximization of short-term than of long-term energy intake. We thus provide some evidence that, contrary to established principles of classic optimality models, the foraging decisions of bison reduce potential long-term gains by maximizing short-term gains.

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@ARTICLE { FortinFryxellPilote2002,
    AUTHOR = { Fortin, D. and Fryxell, J.M. and Pilote, R. },
    TITLE = { The temporal scale of foraging decisions in bison },
    JOURNAL = { Ecology },
    YEAR = { 2002 },
    VOLUME = { 83 },
    PAGES = { 970-982 },
    NUMBER = { 4 },
    NOTE = { In File 0012-9658 Notes: Document Type: Article Publisher: Ecological Soc Amer ISO Source Title Abbreviation: Ecology ISI Document Solutions: 533HP Publisher City: Washington 29-Character Source Title Abbreviation: Ecology Publisher Address: 1707 H St Nw, Ste 400, Washington, Dc 20006-3915 Usa },
    ABSTRACT = { Assessing the temporal scale under which gain is maximized is critical for the understanding of diet choice by animals. Classical foraging theory assumes that animals maximize long- term rates. Few studies have considered several temporal scales concurrently, however, weakening tests of rate-maximizing models. We used contingency models based on maximization of short-term vs. long-term energy intake by bison (Bison bison). Model predictions were tested against field observations conducted during six periods of 1998: two periods in the winter, one in the spring, and three in the summer. During most of the year, foraging characteristics and plant attributes suggested that intake rate of bison should be limited by ingestion time over short periods of time, and by digestive constraints over long periods of time. Diet predictions varied across temporal scales for four of the six sampling periods. Selecting Agropyron spp., rather than Carex atherodes, during these periods would result in an increase of daily energy intake by as much as 15 565 kJ (i.e., 7.4% of daily-gains) but would necessitate a longer daily foraging time. We observed, instead. that bison preferred C. atherodes to Agropyron spp., suggesting that patterns of diet selection by bison were more consistent with maximization of short-term than of long-term energy intake. We thus provide some evidence that, contrary to established principles of classic optimality models, the foraging decisions of bison reduce potential long-term gains by maximizing short-term gains. },
    KEYWORDS = { Agropyron Spp. Bison Bison Bison Carex Atherodes Contingency Model Digestive Constraints Energy Maximization Foraging Decision Intake Rate Large Grazers Optimal Diet Temporal Scales Optimal Diet Choice Functional-Response Mammalian Herbivores Grassland Herbivores Thomsons Gazelles Rate Maximization Bite Dimensions Digestive Rate Sward Height Patch Choice },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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