Terrestrial bird species richness in urban riparian zone: hypotheses of area, isolation, productivity, heterogeneity and disturbance.
Date Issued
2014
Date
2014
Author(s)
Lu, Ya-Jung
Abstract
The relationship between bird species richness （BSR） and urban environment is important for concerns about the negative impact of urbanization. However, recent studies have started to focus on the maintenance of urban BSR in the face of increasing human population and expanding cities, and have proposed hypotheses that could lead to an increase in BSR.
Cities are typically located near large water bodies. Urban riparian zone is the hotspot of BSR. Compared with urban green spaces, riparian zones have contiguous and larger areas. In addition, habitat heterogeneity caused by irregular flood and disturbance provides various resources for birds, with many specialists living only in this area.
We examined patterns of habitat use by birds at the local and landscape level during 3-6 months 2013 at 72 riparian plots along an urban gradient in Taipei city. Using generalized linear regression, we test the hypothesis of area （surrogated by width of riparian）, isolation （surrogated by distance from mountain）, productivity [surrogated by normalized difference vegetation index （NDVI）], heterogeneity （surrogated by habitat heterogeneity index and tree diversity）, and disturbance （surrogated by percentage of built area） respectively for BSR and bird guilds. Besides, ranking the relative importance of environmental factors by Akaike weight.
We found that distance from mountain was the most important predictor of BSR. We suggest isolation is the primary process of BSR. Tree diversity, the second most important factor, was positively correlated with BSR; on the other hand, habitat specialist prefer the higher NDVI, and the distance from mountain are most important factor for habitat generalist.
The results of this study to clarify the effects of environmental factors on the riparian zone of BSR and bird guild in Taipei, and construct relative importance of hierarchy. We also suggest establish connectivity with mountain, and improve habitat quality inside the riparian zone. It will effectively maintain and increase BSR. for building a biodiversity-friendly city.in Taipei
Subjects
都市河濱
人為干擾
初級生產力
棲地異質性
鳥種多樣性
Type
thesis
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