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Titolo:
Postbreeding movements of American Avocets and implications for wetland connectivity in the western Great Basin
Autore:
Plissner, JH; Haig, SM; Oring, LW;
Indirizzi:
USGS, Forest & Rangeland Ecosyst Sci Ctr, Corvallis, OR 97331 USA USGS Corvallis OR USA 97331 land Ecosyst Sci Ctr, Corvallis, OR 97331 USA Univ Nevada, Dept Environm & Resource Sci, Reno, NV 89512 USA Univ NevadaReno NV USA 89512 Environm & Resource Sci, Reno, NV 89512 USA
Titolo Testata:
AUK
fascicolo: 2, volume: 117, anno: 2000,
pagine: 290 - 298
SICI:
0004-8038(200004)117:2<290:PMOAAA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANDSCAPE; CONSERVATION; SANDPIPERS; MIGRATION; DISPERSAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Haig, SM USGS, Forest & Rangeland Ecosyst Sci Ctr, 3200 SW Jefferson Way, Corvallis, OR 97331 USA USGS 3200 SW Jefferson Way Corvallis OR USA 97331 s, OR 97331 USA
Citazione:
J.H. Plissner et al., "Postbreeding movements of American Avocets and implications for wetland connectivity in the western Great Basin", AUK, 117(2), 2000, pp. 290-298

Abstract

Wetlands in the western Great Basin of the United States are patchily distributed and undergo extensive seasonal and annual variation in water levels. The American Avocet (Recurvirostra americana) is one of many shorebird species that use these wetlands as breeding and migratory stopover sites and must adjust to variable conditions. WE used radio telemetry to determine postbreeding, premigratory movement patterns of avocets throughout the regionIn 1996 and 1997, 185 breeding adults were captured and fitted with radio transmitters at five breeding areas in Oregon, California, and Nevada. Regular aerial and ground surveys were conducted at the five main study areas from June through September, or until all avocets had left a site. Other wetlands in the western Great Basin also were surveyed by aircraft for the presence of radio-marked birds. Fifty-six percent of radio-marked avocets werestill detected in the region at least eight weeks after capture. Each of these individuals was detected at an average of 2.1 lakes (range 0 to 6), with 74% found at more than one lake system. Forty radio-marked individuals moved at least 200 km between wetlands prior to migration, most of which dispersed northward. Male and female patterns did not differ significantly. Overall, movements may be associated with a prebasic molt, exploitation of a superabundant food source in northern lakes, and reconnaissance for future breeding efforts or staging sites. These results also demonstrate wide-ranging patterns of dispersal in this species and suggest a need for the consideration of large-scale habitat connectivity issues in establishing conservation strategies for shorebirds in the western Great Basin.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 04:11:47