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Titolo:
The effect of handling time on interference among house sparrows foraging at different seed densities
Autore:
Johnson, CA; Giraldeau, LA; Grant, JWA;
Indirizzi:
Concordia Univ, Dept Biol, Montreal, PQ H3G 1M8, Canada Concordia Univ Montreal PQ Canada H3G 1M8 l, Montreal, PQ H3G 1M8, Canada
Titolo Testata:
BEHAVIOUR
, volume: 138, anno: 2001,
parte:, 5
pagine: 597 - 614
SICI:
0005-7959(200105)138:<597:TEOHTO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
IDEAL FREE DISTRIBUTION; FOOD-INTAKE RATE; GROUP-SIZE; HAEMATOPUS-OSTRALEGUS; COMPETITIVE ABILITY; UNEQUAL COMPETITORS; FUNCTIONAL-RESPONSE; RESOURCE DENSITY; CONTINUOUS INPUT; MYTILUS-EDULIS;
Keywords:
interference; encounter rate; foraging rate; handling time; house sparrows; seed density; social vigilance; aggression;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Johnson, CA Concordia Univ, Dept Biol, 1455 De Maisonneuve Blvd W, Montreal, PQ H3G 1M8, Canada Concordia Univ 1455 De Maisonneuve Blvd W Montreal PQCanada H3G 1M8
Citazione:
C.A. Johnson et al., "The effect of handling time on interference among house sparrows foraging at different seed densities", BEHAVIOUR, 138, 2001, pp. 597-614

Abstract

Interference models of the ideal free distribution (IFD) assume competition among foraging animals causes intake rates to decline with increasing competitor density and that the strength of the decline influences forager distributions among food patches. However, the resulting distributions of animals may depend on which components of foraging success contribute to interference. We examined the effect of group size (1-13 birds) on the prey encounter rates, handling times, and foraging rates of house sparrows, Passer domesticus, feeding at three seed densities in a suburban backyard. House sparrows did not experience interference during search. Interference arose primarily front foraging time lost handling seeds. Foraging rates decreased with increasing seed density as a consequence of increased handling times. Also, birds experiencing significant increases in handling time with group size suffered most from interference. Our results suggest that animals adjusthandling time to avoid costly aggressive interactions, indicating that handling time may be an important component of interference in some foraging systems. Future studies estimating interference should try to identify whichcomponents of foraging contribute to interference, paying particular attention to handling times for species that monitor and avoid competitors.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 04:38:18