THE SPATIAL EXTENT AND RELATIVE INFLUENCE OF LANDSCAPE-LEVEL FACTORS ON WINTERING BIRD POPULATIONS

被引：152
作者：
PEARSON, SM
机构：
[1] Department of Zoology and Institute of Ecology, University of Georgia, Athens, 30602, GA
来源：
LANDSCAPE ECOLOGY | 1993年 / 8卷 / 01期
关键词：
SPECIES DIVERSITY; PATCHES; GRAIN; GEORGIA;
D O I：
10.1007/BF00129863
中图分类号：
Q14 [生态学（生物生态学）];
学科分类号：
071012 ; 0713 ;
摘要：
The influences of the landscape matrix (complex of habitats surrounding a study plot) and within-patch vegetation were studied in bird communities wintering in the piedmont of Georgia, USA. Variation at the landscape and within-patch levels was controlled to reduce the likelihood of confounding and spurious relationships. The landscape matrix within 500 m of each study plot was quantified from aerial photographs. Statistical models using landscape matrix and within-patch vegetation variables explained 73-84% of variation in bird abundance and diversity among sites with landscape matrix variables accounting for 30-90% of the variation. Variation in bird species richness and diversity was explained solely by landscape variables. Models for individual species such as Carolina Wrens (Thyrothorus ludovicianus) and Rufous-sided Towhees (Pipilo erythrophthalmus) had r2 > 0.80, with the landscape matrix variables accounting for the majority of this variation. However, other species like Northern Cardinals (Cardinalis cardinalis) and White-throated Sparrows (Zonotrichia albicollis) were most strongly influenced by within-plot vegetation. The landscape influence extended beyond habitats immediately adjacent to the study plots as indicated by significant variables describing variation in more distant habitat patches. These analyses illustrate a technique for comparing the strength of within-patch versus landscape influences and measuring the spatial extent of the landscape influence in fine-grained landscapes.
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页码：3 / 18
页数：16
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