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Titolo:
Seed supply as a limiting factor for granivorous bird assemblages in the Monte Desert, Argentina
Autore:
Blendinger, PG; Ojeda, RA;
Indirizzi:
Consejo Nacl Invest Cient & Tecn, IADIZA,CRICYT, Biodivers Res Grp, RA-5500 Mendoza, Argentina Consejo Nacl Invest Cient & Tecn Mendoza Argentina RA-5500 za, Argentina
Titolo Testata:
AUSTRAL ECOLOGY
fascicolo: 4, volume: 26, anno: 2001,
pagine: 413 - 422
SICI:
1442-9985(200108)26:4<413:SSAALF>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
GALAPAGOS GROUND FINCHES; WINTER SPARROW DENSITIES; FOOD; PATTERNS; FACILITATION; COMPETITION; LIMITATION; DIVERSITY; GEOSPIZA; RAINFALL;
Keywords:
arid lands; food limitation; granivory; Neotropical birds; Northern Monte Desert; seed-eating birds; winter limitation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Blendinger, PG Consejo Nacl Invest Cient & Tecn, IADIZA,CRICYT, Biodivers Res Grp, CC 507, RA-5500 Mendoza, Argentina Consejo Nacl Invest Cient & Tecn CC 507 Mendoza Argentina RA-5500
Citazione:
P.G. Blendinger e R.A. Ojeda, "Seed supply as a limiting factor for granivorous bird assemblages in the Monte Desert, Argentina", AUSTRAL EC, 26(4), 2001, pp. 413-422

Abstract

Seed availability may limit the size of granivorous bird populations, particularly in desert environments. Seasonal and annual fluctuations in the abundance of granivorous birds were studied at three sites in the Northern Monte Desert, Argentina. The way in which these changes were related to seed supply was also studied. Granivore abundance and biomass, as well as seed abundance, were greater in winter. Changes in total granivore abundance weremostly because of variations in numbers of the most mobile bird species, all of which were found to have similar patterns of variation in their abundance. Evidence suggests that during the non-breeding season, the most mobile species are able to track patches of high seed availability over long distances, whereas the abundance of less vagile species largely depends on thelocal ecological conditions. Seed supply is a proximate factor that limitsthe abundance of granivorous birds in the Monte Desert during the winter, but does not limit species richness. Granivore abundance was not correlatedwith seed supply in spring.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 19:52:46