Tropical rainforest bird community structure in relation to altitude, tree species composition, and null models in the Western Ghats, India
Tropical rainforest bird community structure in relation to altitude, tree species composition, and null models in the Western Ghats, India
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印度西高止山脉热带雨林鸟类群落结构与海拔、树种组成和零模型的关系
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发表时间：
2005
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通讯作者：
R. Sukumar
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作者：
T. Raman;N. Joshi;R. Sukumar
海拔梯度上物种分布的研究是必不可少的，以了解社区组织的原则，以及保护物种在山区。本研究探讨了物种丰富度，丰富度，成分，范围大小和分布的热带雨林鸟类在14个站点沿着海拔梯度（500-1400米）在Kalakad-Mundanthurai老虎保护区（KMTR）的西高止山脉，印度。与理论预期相反，留鸟的物种丰富度并没有随海拔的变化显着，但物种组成的变化很大（<10%的相似性）之间的最低和最高海拔网站。物种丰富度的恒定性可能是由于生产力的相对恒定性和植被结构缺乏海拔趋势。鸟类的海拔范围大小，预计将增加海拔根据拉波波特的规则，被发现显示出一个相反的倒U形模式，因为物种与狭窄的海拔分布，包括地方性，发生在两端的梯度（低于800米和高于1,200米）。鸟类物种组成也没有随机变化沿着梯度使用层次结构的零模型的社区大会，从完全不受约束的模型，物种丰富度和范围大小分布的限制。相反，鸟类群落组成与海拔和树种组成的网站显着相关，表明鸟类群落结构的决定性因素的影响。保护低海拔和高海拔地区和维护树种组成对栖息地的改变是重要的鸟类保护在南部西高止山脉雨林。
Studies of species distributions on elevational gradients are essential to understand principles of community organisation as well as to conserve species in montane regions. This study examined the patterns of species richness, abundance, composition, range sizes, and distribution of rainforest birds at 14 sites along an elevational gradient (500-1400 m) in the Kalakad-Mundanthurai Tiger Reserve (KMTR) of the Western Ghats, India. In contrast to theoretical expectation, resident bird species richness did not change significantly with elevation although the species composition changed substantially (<10% similarity) between the lowest and highest elevation sites. Constancy in species richness was possibly due to relative constancy in productivity and lack of elevational trends in vegetation structure. Elevational range size of birds, expected to increase with elevation according to Rapoport's rule, was found to show a contrasting inverse U-shaped pattern because species with narrow elevational distributions, including endemics, occurred at both ends of the gradient (below 800 m and above 1,200 m). Bird species composition also did not vary randomly along the gradient as assessed using a hierarchy of null models of community assembly, from completely unconstrained models to ones with species richness and range-size distribution restrictions. Instead, bird community composition was significantly correlated with elevation and tree species composition of sites, indicating the influence of deterministic factors on bird community structure. Conservation of low- and high-elevation areas and maintenance of tree species composition against habitat alteration are important for bird conservation in the southern Western Ghats rainforests.