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dc.contributor.author
Filloy, Julieta
dc.contributor.author
Bellocq, Maria Isabel
dc.date.available
2024-10-03T10:52:07Z
dc.date.issued
2006-06
dc.identifier.citation
Filloy, Julieta; Bellocq, Maria Isabel; Spatial Variations in the Abundance of Sporophila Seedeaters in the Southern Neotropics: Contrasting the Effects of Agricultural Development and Geographical Position; Springer; Biodiversity and Conservation; 15; 10; 6-2006; 3329-3340
dc.identifier.issn
0960-3115
dc.identifier.uri
http://hdl.handle.net/11336/245387
dc.description.abstract
Human alterations of the habitat may interfere with the natural processes that determine spatial patterns of species abundance. We examine the geographical position hypothesis and the agricultural transformation hypothesis to explain spatial patterns in the abundance of seedeater species (Sporophila spp.) in the southern Neotropics. The geographical position hypothesis predicts decreasing abundance with increasing distance from the center to the edge of a species´ geographical range, and the agricultural transformation hypothesis predicts changing abundance as a response of variations in agricultural intensity. Bird abundance and the proportion of agricultural land were estimated for 16 transects covering 500 km along a gradient of both increasing agricultural intensity and increasing distance from the center of the species´ geographical ranges. We found no evidence of distance effects on seedeater abundance. Responses to agricultural intensity varied among species. Neither the geographical position nor the agricultural transformation seemed to explain the pattern of abundance of Double-collared seedeaters (S. caerulescens). Agricultural intensity accounted for 63% and 99% of the spatial variation in the abundance of Dark-throated (S. ruficollis) and Tawny-bellied (S. hypoxantha) seedeaters, supporting the agricultural transformation hypothesis. The Dark-throated seedeater seem to be more tolerant to agricultural transformation than the Tawny-bellied seedeater, as they were not recorded in areas with more than 60% and 20% of agricultural lands, respectively. Our results indicate that the Dark-throated seedeater and the Tawny-bellied seedeater will most likely face (or may be already facing) a reduction in the southern part of their geographical range due to habitat loss to agriculture.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Abundance
dc.subject
Agricultural gradient
dc.subject
Argentina
dc.subject
Geographical range
dc.subject
Seedeaters
dc.subject
Sporophila
dc.title
Spatial Variations in the Abundance of Sporophila Seedeaters in the Southern Neotropics: Contrasting the Effects of Agricultural Development and Geographical Position
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-09-23T13:59:30Z
dc.journal.volume
15
dc.journal.number
10
dc.journal.pagination
3329-3340
dc.journal.pais
Alemania
dc.journal.ciudad
Dordrecht
dc.description.fil
Fil: Filloy, Julieta. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Bellocq, Maria Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina
dc.journal.title
Biodiversity and Conservation
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007/s10531-005-1341-z
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10531-005-1341-z
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