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Titolo:
Great egret preference for catfish size classes
Autore:
Werner, SJ; Tobin, ME; Fioranelli, PB;
Indirizzi:
Mississippi State Univ, USDA, Anim & Plant Hlth Inspect Serv,Wildlife Serv, Natl Wildlife Res Ctr,Mississippi Res Stn, Mississippi State, MS 39762 USA Mississippi State Univ Mississippi State MS USA 39762 State, MS 39762 USA USDA, Anim & Plant Hlth Inspect Serv, Wildlife Serv, Natl Wildlife Res Ctr, Ft Collins, CO 80521 USA USDA Ft Collins CO USA 80521 l Wildlife Res Ctr, Ft Collins, CO 80521 USA
Titolo Testata:
WATERBIRDS
fascicolo: 3, volume: 24, anno: 2001,
pagine: 381 - 385
SICI:
1524-4695(200112)24:3<381:GEPFCS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
HERONS;
Keywords:
Ardea alba; aquaculture; behavior; depredation; ecology; fish; foraging; handling time; Ictalurus punctatus; wading bird;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Werner, SJ Mississippi State Univ, USDA, Anim & Plant Hlth Inspect Serv,Wildlife Serv, Natl Wildlife Res Ctr,Mississippi Res Stn, PO Drawer 6099, Mississippi State, MS 39762 USA Mississippi State Univ PO Drawer 6099 Mississippi State MS USA 39762
Citazione:
S.J. Werner et al., "Great egret preference for catfish size classes", WATERBIRDS, 24(3), 2001, pp. 381-385

Abstract

Several species of fish-eating birds are commonly observed near aquaculture facilities in the southern United States. An understanding of the relationships between these birds and specific commodities is needed to interpret and manage bird impacts to aquacultural production. We conducted two foraging experiments to evaluate the preference of Great Egrets (Ardea alba) for three specific size classes of Channel Catfish (Ictalurus punctatus). During six no-choice feeding trials, egrets consumed significantly more small (7.5-10 cm) fingerlings than medium (15-18 cm) or large (23-25 cm) catfish. Egrets captured 19 large catfish, and ingested only two, even when no other fish were available. During two-choice trials, Great Egrets significantly preferred small fingerlings to medium-sized fish, and medium-sized catfish to large fish. Handling time was directly related to the size of catfish ingested. Handling time was inversely related to the number of catfish ingested from each size class, particularly when Great Egrets were given a choice between two catfish size classes. Thus, we infer that the ease of capture and physical defenses (e.g., catfish spines) associated with particular foods affect Great Egret foraging preferences. Management of Great Egret impacts to aquacultural production should focus on dispersing egrets from ponds containing small (< 18 cm) Channel Catfish, rather than generalized dispersal at all ponds on all farms.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 12:43:42