A Century of Avian Community Turnover in an Urban Green Space in Northern California

[摘要] Abstract. Over long time periods, urbanization is expected to have a negative effect on species diversity. Predicted effects generally follow one of three competing paradigms: diversity decay, homogenization, or community-composition turnover. However, it has been hypothesized that urban green spaces may provide a means by which urban areas can maintain or increase their species diversity over time. We used surveys conducted in 1913–18,1938– 39, and 2006–07 on the campus of the University of California, Berkeley, to evaluate how an avian community has changed over time in the context of urban growth. In each of the three periods the community differed greatly, yet we found no evidence for a decline in species or functional diversity. Despite the birds of the 1913–18 community having a greater affinity for native habitats than birds of later periods, we found no further evidence that specialists were being replaced by generalists. Of the three paradigms, our results strongly supported community-composition...

[学科分类] 动物科学

[关键词] community-composition turnover;diversity decay;green spaces;homogenization;urbanization