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首页> 外文期刊>Journal of Biogeography >Richness and composition of plants and birds on land-bridge islands: effects of island attributes and differential responses of species groups
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Richness and composition of plants and birds on land-bridge islands: effects of island attributes and differential responses of species groups

机译：陆桥岛上植物和鸟类的丰富性和组成：岛屿属性的影响和物种组的不同反应

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Aim To test relationships between the richness and composition of vascular plants and birds and attributes of habitat fragments using a model land-bridge island system, and to investigate whether the effects of fragmentation differ depending on species natural history traits. Location Thousand Island Lake, China. Methods We compiled presence/absence data of vascular plant and bird species through exhaustive surveys of 41 islands. Plant species were assigned to two categories: shade-intolerant and shade-tolerant species; bird species were assigned to three categories: edge, interior, and generalist species. We analysed the relationships between island attributes (area, isolation, elevation, shape complexity, and perimeter to area ratio) and species richness using generalized linear models (GLMs). We also investigated patterns of composition in relation to island attributes using ordination (redundancy analysis). Results We found that island area explained a high degree of variation in the species richness of all species groups. The slope of the speciesarea relationship (z) was 0.16 for all plant species and 0.11 for all bird species. The lowest z-value was for generalist birds (0.04). The species richness of the three plant species groups was associated with island area per se, while that of all, generalist, and interior birds was explained mainly by elevation, and that of edge bird species was associated primarily with island shape. Patterns of species composition were most strongly related to elevation, island shape complexity, and perimeter to area ratio rather than to island area per se. Species richness had no significant relationship with isolation, but species composition did. We also found differential responses among the species groups to changes in island attributes. Main conclusions Within the Thousand Island Lake system, the effects of fragmentation on both bird and plant species appear to be scale-dependent and taxon-specific. The number of plant species occurring on an island is strongly correlated with island area, and the richness of birds and the species composition of plants and birds are associated with variables related to habitat heterogeneity. We conclude that the effects of fragmentation on species diversity and composition depend not only on the degree of habitat loss but also on the specific patterns of habitat fragmentation.
机译：目的使用模型陆桥岛系统测试维管植物和鸟类的丰富度与组成与栖息地碎片属性之间的关系，并研究碎片化的影响是否因物种的自然历史特征而异。地点中国千岛湖。方法我们通过对41个岛屿的详尽调查，汇总了维管植物和鸟类物种的有无数据。植物种类被分为两类：耐荫性和耐荫性物种;鸟类物种分为三类：边缘物种，内部物种和通才物种。我们使用广义线性模型（GLM）分析了岛屿属性（面积，隔离度，海拔，形状复杂度和周长与面积之比）与物种丰富度之间的关系。我们还使用排序（冗余分析）研究了与岛屿属性相关的构图模式。结果我们发现岛区解释了所有物种组物种丰富度的高度变化。所有植物物种的物种面积关系（z）的斜率分别为0.16和所有鸟类物种的0.11。 Z值最低的是通才鸟类（0.04）。这三个植物物种组的物种丰富度本身与岛屿面积有关，而所有鸟类，普通鸟类和室内鸟类的物种丰富度主要由海拔高度解释，边缘鸟类的物种丰富度主要与岛屿形状有关。物种组成的模式与海拔高度，岛屿形状的复杂性以及周长与面积之比（而不是与岛屿面积本身）最相关。物种丰富度与隔离没有显着关系，但物种组成却没有。我们还发现物种组之间对岛屿属性变化的不同响应。主要结论在千岛湖系统中，破碎对鸟类和植物物种的影响似乎与规模有关，并且与分类群有关。岛屿上发生的植物物种数量与岛屿面积密切相关，鸟类的丰富程度以及植物和鸟类的物种组成与与栖息地异质性有关的变量相关。我们得出结论，破碎化对物种多样性和组成的影响不仅取决于生境丧失的程度，还取决于生境破碎化的具体模式。

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