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Wednesday, April 11 • 10:15am - 10:30am
RARITY, BIODIVERSITY AND SPECIES DISTRIBUTION: Beta-diversity Patterns of Breeding Birds Influenced by Environmental and Climatic Heterogeneity in Taiwan

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AUTHORS: Chia Hsieh*, Mao-Ning Tuanmu – Academia Sinica

ABSTRACT: Human-induced environmental changes, including land use/cover change and climate change, are affecting biodiversity patterns at different temporal and spatial scales. Since environmental heterogeneity has long been recognized as a key landscape characteristic with strong relevance for biodiversity and its functions, changes in the heterogeneity may have profound impacts on the variation in species compositions among communities across space, i.e. beta-diversity. To understand how the heterogeneity in land cover and climates affect beta-diversity patterns of breeding birds across spatial scales in Taiwan, we measured the beta-diversity of ~200 bird communities based on Taiwan Breeding Bird Survey data collected from 2009-2015. We calculated the Sorensen index as a measure of overall beta-diversity for each community and split it into two components: turnover and nestedness. We then investigated the associations between the three measures of beta-diversity and environmental heterogeneity at three spatial scales. Results showed that the landcover and climatic heterogeneity generally had positive effects on the bird community dissimilarity. Although the beta-diversity was mostly contributed by turnover, the nontrivial contribution of nestedness suggested another pathway affecting breeding bird community dissimilarity in Taiwan. With increasing spatial scales, the climates had increasing effects on overall beta-diversity and turnover, while the land cover had increasing effects on nestedness. This study improves our understanding of the patterns and potential drivers of beta-diversity of birds across spatial scales. It also implies that continued changes in land use/cover and potential future changes in the climates, resulting in homogenization in the environment and climates, may lead to biotic homogenization in bird communities in Taiwan.

Wednesday April 11, 2018 10:15am - 10:30am CDT
LaSalle 2 (7th Floor)

Attendees (3)