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Titolo:
Feeding associations between Snowy Egrets and Red-breasted Mergansers
Autore:
Bennett, J; Smithson, WS;
Indirizzi:
Calif State Univ Long Beach, Dept Biol Sci, Long Beach, CA 90840 USA CalifState Univ Long Beach Long Beach CA USA 90840 g Beach, CA 90840 USA
Titolo Testata:
WATERBIRDS
fascicolo: 1, volume: 24, anno: 2001,
pagine: 125 - 128
SICI:
1524-4695(2001)24:1<125:FABSEA>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Keywords:
Boisa Chica; California; Egretta thula; feeding association; Mergus serrator; Red-breasted Merganser; Snowy Egret;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Bennett, J Univ Wyoming, Wyoming Nat Divers Database, Laramie, WY 82072 USA Univ Wyoming Laramie WY USA 82072 abase, Laramie, WY 82072 USA
Citazione:
J. Bennett e W.S. Smithson, "Feeding associations between Snowy Egrets and Red-breasted Mergansers", WATERBIRDS, 24(1), 2001, pp. 125-128

Abstract

During the winter months Snowy Egrets (Egretta thula) often form feeding associations with Red-breasted Mergansers (Mergus serrator) at Bolsa Chica Ecological Reserve, Orange County, California. We quantified and compared foraging success of egrets feeding in associations with success of egrets feeding independently. During winter 1996/1997, egrets feeding with mergansersincreased their rate of prey acquisition by increasing both their strikingrate (strikes/min) and their striking efficiency (captures/strike). In contrast, during winter 1997-98 we found no differences in the rate of prey acquisition between egrets feeding independently and those feeding in association with mergansers. Although ice did not quantify the size of prey taken,egrets feeding in associations in 1997-1998 may have captured larger prey than those that were feeding alone. ERrets may benefit from feeding in associations with mergansers by increasing their prey capture rate and/or by capturing larger prey.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/12/19 alle ore 15:06:36