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首页> 外文期刊>Ostrich >Niche partitioning and densities of Albertine Rift endemics and their congeners in Bwindi Impenetrable Forest, Uganda.
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Niche partitioning and densities of Albertine Rift endemics and their congeners in Bwindi Impenetrable Forest, Uganda.

机译：乌干达布恩迪难以穿越的森林中阿尔伯汀纵谷特有种及其同类的生态位划分和密度。

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Biogeographical theory predicts that restricted-range species should typically occur at lower densities than ecologically similar, but geographically widespread species. Exceptions may arise where endemics occupy distinctive habitats, in which they are capable of reaching higher densities than their more widespread competitors. This paper describes the habitat requirements and abundance of a sample of insectivores in Bwindi Impenetrable Forest, part of the Albertine Rift mountains Endemic Bird Area. The altitude ranges, habitat preferences, foraging niches and densities of five Albertine Rift endemics from the genera Phylloscopus, Apalis, Batis and Parus were compared with those of their congeners, or with ecologically similar species. The five endemics were associated with ridgetop forest, steeply sloping ground and a sparse understorey or field layer. They foraged within a narrower height range and used a wider range of substrates than their partner species, but showed no significant differences with regard to altitude range, the number of habitat features with which they were associated, foraging niche width or population density. Two endemic apalises were among the most abundant of their genus, achieving densities at least seven times that of the least abundant apalis at Bwindi. These findings are broadly consistent with results from studies of other montane bird communities in Africa, which suggest that bird species endemic to Afromontane forests often achieve densities comparable with those of widespread, ecologically similar species, and may thus avoid the 'double jeopardy' of small range size and low population density.
机译：生物地理学理论预测，范围受限的物种通常应以比生态相似但地理分布广泛的物种更低的密度发生。当地方性流行病占据独特的栖息地时，它们比其他更广泛的竞争者能够达到更高的密度时，可能会出现例外。本文描述了阿尔伯丁纵谷山区特有鸟类地区一部分的布恩迪难以穿越的森林中食虫动物的栖息地需求和丰富度。 Phylloscopus ， Apalis ， Batis 和 Parus属的五种艾伯汀纵谷特有物种的海拔范围，栖息地偏好，觅食生态位和密度与同类动物或生态相似的物种进行了比较。这五种地方病与山脊森林，陡峭的地面和稀疏的地下层或田间地层有关。他们在较窄的高度范围内觅食，并使用了比其伴侣物种更大范围的底物，但在海拔范围，与之相关的栖息地特征数量，生态位宽度或种群密度方面没有显着差异。两个地方性骨质疏松是其属中最丰富的，其密度至少是布恩迪地区最不丰富的apalis的七倍。这些发现与非洲其他山地鸟类群落的研究结果大致相符，该研究表明，Afromontane森林特有的鸟类物种的密度通常可与广泛的，生态上相似的物种相媲美，从而可以避免小型鸟类的“双重危害”范围大小和低人口密度。

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