<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Almeida, J</style></author><author><style face="normal" font="default" size="100%">Granadeiro, J P</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Seasonal variation of foraging niches in a guild of passerine birds in a cork-oak woodland</style></title><secondary-title><style face="normal" font="default" size="100%">ARDEA</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">community ecology</style></keyword><keyword><style  face="normal" font="default" size="100%">cork-oak woodland</style></keyword><keyword><style  face="normal" font="default" size="100%">guild</style></keyword><keyword><style  face="normal" font="default" size="100%">niche</style></keyword><keyword><style  face="normal" font="default" size="100%">passerines</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2000</style></year></dates><publisher><style face="normal" font="default" size="100%">NEDERLANDSE ORNITHOLOGISCHE UNIE</style></publisher><pub-location><style face="normal" font="default" size="100%">C/O PAUL STARMANS, OUDE ARNHEMSEWEG 261, 3705 BD ZEIST, NETHERLANDS</style></pub-location><volume><style face="normal" font="default" size="100%">88</style></volume><pages><style face="normal" font="default" size="100%">243-252</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Spatial foraging niches of a pariform guild in a cork-oak woodland were examined during winter and spring. Niche structure was described in terms of the niche dimensions foraging substrate, foraging height and part of tree, and seasonal changes in niche breadth and overlap were examined. Considering the difficulties of dealing with the multidimensionality of Hutchinson's niche concept, we adopted a multivariate approach and identified the most important factors for spatial segregation. Significant differences between winter and spring utilisation of the foraging dimensions were found for the guild as a whole. At the species level, however, no major seasonal differences in the utilisation of foraging dimensions were found. No consistent seasonal trend occurred in terms of niche size or niche overlap. Multivariate analysis showed that the guild structure is basically the same in winter or spring, with Little influence of species that are present in only one of the two seasons. These results suggest that there is no food shortage in winter for the pariform guild in this woodland. The niche dimensions related with tree structure and foraging substrate appeared to be the most important ones in species segregation.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Almeida, J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Caracterização da avifauna nidificante num montado de azinho Quercus rotundifolia por aplicação do método dos mapas: dois anos de estudo</style></title><secondary-title><style face="normal" font="default" size="100%">Airo</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Avifauna nidificante</style></keyword><keyword><style  face="normal" font="default" size="100%">método-dos-mapas (PG)</style></keyword><keyword><style  face="normal" font="default" size="100%">montado</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">1-6</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Com o objectivo de obter informação de base sobre a composição e estrutura das comunidades de aves dos povoamentos florestais com mais expressão em Portugal, a avifauna nidificante numa parcela de 10ha de montado de azinho foi estudada durante duas épocas de reprodução (1989 e 1990), por aplicação do métod-dos-mapas. Registou-se uma grande estabilidade na composição da comunidade nidificante, assim como no número e traçado dos territórios delineados nos dois anos por aquele método. O número de espécies nidificantes variou entre 13 e 14, a densidade entre 30 e 31 casais/10 ha, a diversidade entre 3,45 e 3,34 e a equiparação entre 0,9 e 0,91</style></abstract></record></records></xml>