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Titolo:
MONITORING SPECIES RICHNESS AND ABUNDANCE OF SHOREBIRDS IN THE WESTERN GREAT-BASIN
Autore:
WARNOCK N; HAIG SM; ORING LW;
Indirizzi:
POINT REYES BIRD OBSERV,4990 SHORELINE HWY STINSON BEACH CA 94970 US GEOL SURVEY,FOREST & RANGELAND ECOSYST SCI CTR CORVALLIS OR 97331 UNIV NEVADA,DEPT ENVIRONM & RESOURCE SCI RENO NV 89512
Titolo Testata:
The Condor
fascicolo: 4, volume: 100, anno: 1998,
pagine: 589 - 600
SICI:
0010-5422(1998)100:4<589:MSRAAO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONSERVATION; POPULATION; MIGRATION;
Keywords:
CENSUSING; CONSERVATION; GREAT BASIN; MONITORING; SHOREBIRDS; WETLANDS; WHSRN SITE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
N. Warnock et al., "MONITORING SPECIES RICHNESS AND ABUNDANCE OF SHOREBIRDS IN THE WESTERN GREAT-BASIN", The Condor, 100(4), 1998, pp. 589-600

Abstract

Broad-scale avian surveys have been attempted within North America with mixed results. Arid regions, such as the Great Basin, are often poorly sampled because of the vastness of the region, inaccessibility of sites, and few ornithologists. In addition, extreme variability in wetland habitat conditions present special problems for conducting censuses of species inhabiting these areas. We examined these issues in assessing multi-scale shorebird (order: Charadriiformes) censuses conducted in the western Great Basin from 1992-1997. On ground surveys, we recorded 31 species of shorebirds, but were unable to accurately estimatepopulation size. Conversely, on aerial surveys we were able to estimate regional abundance of some shorebirds, but were unable to determinespecies diversity. Aerial surveys of three large alkali lakes in Oregon (Goose, Summer, and Abert Lakes) revealed > 300,000 shorebirds in one year of this study, of which 67% were American Avocets (Recurvirostra americana) and 30% phalaropes (Phalaropus spp.). These lakes clearly meet Western Hemisphere Shorebird Reserve Network guidelines for designation as important shorebird sites. Based upon simulations of our monitoring effort and the magnitude and variation of numbers of American Avocets, detection of 5-10% negative declines in populations of these birds would take a minimum of 7-23 years of comparable effort. We conclude that a combination of ground and aerial surveys must be conducted at multiple sites and years and over a large region to obtain an accurate picture of the diversity, abundance, and trends of shorebirds in the western Great Basin.

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Documento generato il 02/12/20 alle ore 05:11:14