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首页> 外文期刊>Scientific reports. >The effect of land-use on the diversity and mass-abundance relationships of understory avian insectivores in Sri Lanka and southern India
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The effect of land-use on the diversity and mass-abundance relationships of understory avian insectivores in Sri Lanka and southern India

机译：土地利用对斯里兰卡和印度南部林下鸟类食虫的多样性和质量－丰度关系的影响

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Understory avian insectivores are especially sensitive to deforestation, although regional differences in how these species respond to human disturbance may be linked to varying land-use histories. South Asia experienced widespread conversion of forest to agriculture in the nineteenth century, providing a comparison to tropical areas deforested more recently. In Sri Lanka and the Western Ghats of India, we compared understory insectivores to other guilds, and to insectivores with different vertical strata preferences, both inside mixed-species flocks and for the whole bird community. Overall species richness did not change across the land-use gradient, although there was substantial turnover in species composition between land-use types. We found that the proportion of species represented by insectivores was ~1.14 times higher in forest compared to agriculture, and the proportion of insectivores represented by understory species was ~1.32 times higher in forests. Mass-abundance relationships were very different when analyzed on mixed-species flocks compared to the total community, perhaps indicating reduced competition in these mutualisms. We show that South Asia fits the worldwide pattern of understory insectivores declining with increased land-use intensity, and conclude that these species can be used globally as indicator and/or umbrella species for conservation across different disturbance time scales.
机译：林下鸟类食虫动物对森林砍伐特别敏感，尽管这些物种对人为干扰的反应方式方面的地区差异可能与土地使用历史的变化有关。南亚在19世纪经历了从森林到农业的广泛转化，这可以与最近被砍伐的热带地区进行比较。在斯里兰卡和印度的西高止山脉，我们将林下食虫类动物与其他行会以及具有不同垂直层次偏好的食虫性动物进行了比较，包括混合物种群内部和整个鸟类群落。尽管土地利用类型之间的物种组成发生了很大的变化，但总体物种丰富度并未随土地利用梯度的变化而变化。我们发现，与农业相比，森林中以食虫类为代表的物种比例约高1.14倍，而森林中以林下食虫类所代表的食虫动物比例约高1.32倍。当对混合物种群进行分析时，与整个社区相比，群体质量-丰度关系有很大不同，这可能表明这些互惠关系的竞争减少了。我们表明，南亚符合随着土地利用强度的增加而下降的地下食虫动物的全球格局，并得出结论，这些物种可在全球范围内用作在不同干扰时间尺度上进行保护的指示性和/或保护性物种。

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