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Titolo:
Depletion of seed patches by Merriam's kangaroo rats: are GUD assumptions met?
Autore:
Price, MV; Correll, RA;
Indirizzi:
Univ Calif Riverside, Dept Biol, Riverside, CA 92521 USA Univ Calif Riverside Riverside CA USA 92521 Biol, Riverside, CA 92521 USA
Titolo Testata:
ECOLOGY LETTERS
fascicolo: 4, volume: 4, anno: 2001,
pagine: 334 - 343
SICI:
1461-023X(200107)4:4<334:DOSPBM>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
PREDATION RISK; DESERT RODENTS; HETEROMYID RODENTS; COEXISTENCE; GRANIVORES; RESOURCES; MICROHABITAT; COMPETITION; COMMUNITIES; PREFERENCE;
Keywords:
departure rule; desert rodents; gain curves; giving-up density; Heteromyidae; marginal value theorem; optimal foraging model; patch use; resource depletion; systematic search;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Price, MV Univ Calif Riverside, Dept Biol, Riverside, CA 92521 USA Univ Calif Riverside Riverside CA USA 92521 rside, CA 92521 USA
Citazione:
M.V. Price e R.A. Correll, "Depletion of seed patches by Merriam's kangaroo rats: are GUD assumptions met?", ECOL LETT, 4(4), 2001, pp. 334-343

Abstract

Depletion of experimental seed patches by granivorous animals often is used as a qualitative assay of foraging activity. An optimal foraging model suggests that seed amounts remaining when foragers leave patches ("giving-up-density", GUD) also provide quantitative measures of foraging economics, diet strategies and foraging abilities. Such quantitative uses of GUDs rest on several largely untested assumptions. We tested two of these with Merriam's kangaroo rats: that gain curves are smoothly decelerating, and that foragers leave patches at a constant harvest rate. Harvest rates indeed declined with patch residence time, but in the piecewise linear fashion expected of systematic search. Animals also revisited areas within patches less frequently than expected with random search. In the field, they depleted patchesin multiple visits and did not use a constant-rate leaving rule. These deviations from model assumptions cast doubt on inferences about foraging ecology that have been based on quantitative GUD theory.

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Documento generato il 06/04/20 alle ore 08:29:51