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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >DIVERSITY OF SPECIES ASSEMBLAGES OF ISLANDS - PREDICTIONS AND THEIR TEST USING TREE SPECIES COMPOSITION OF SHOLA FRAGMENTS
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DIVERSITY OF SPECIES ASSEMBLAGES OF ISLANDS - PREDICTIONS AND THEIR TEST USING TREE SPECIES COMPOSITION OF SHOLA FRAGMENTS

机译：岛屿物种组成的多样性-利用SHOLA片段的树种组成进行预测和试验。

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Based on all possible combinations of species that can theoretically exist on islands of different sizes, we estimated similarities among islands of equal size in their species compositions. We found that similarity coefficients among islands of equal sizes increases and the coefficients of variation for similarities decreases with increase in the size of islands. Accordingly, it can be predicted that the species compositions of small fragments shall be more diverse compared to large fragments. We tested this prediction using the tree species composition of the shola fragments at BR Hills, Western Ghats. Similarities among sholas were measured as coefficients of correlation between the frequencies of species in them and also as proportions of species shared among sholas. Small sholas were less similar and shared fewer species among themselves, compared to medium and large sholas. Also, small sholas showed higher coefficient of variation for the correlation coefficients and for proportion of species shared than medium or large sholas. In other words, species assemblage diversity among sholas was found to decrease with their size and large islands appeared to converge towards a common assemblage of species. Based on our results, we argue that small fragments add structural and functional heterogeneity to the ecosystem and hence are as important as are the large fragments in conserving biodiversity. [References: 12]
机译：基于理论上可以存在于不同大小岛屿上的所有可能物种组合，我们估算了大小相同的岛屿之间物种组成的相似性。我们发现，大小相等的岛之间的相似性系数会增加，而相似性的变异系数会随着岛的大小增加而减小。因此，可以预见，与大片段相比，小片段的物种组成将更加多样化。我们使用西高止山脉BR Hills的shola碎片的树种组成测试了这一预测。铲之间的相似性被测量为它们中物种频率之间的相关系数，也被当作铲之间共享的物种比例。与中型和大型铲子相比，小型铲子的相似性较低，彼此之间共享的物种较少。而且，小铁锹与中或大铁锹相比，相关系数和物种共享比例显示出更高的变异系数。换句话说，发现铁锹之间的物种组合多样性随着其大小而减少，大岛似乎趋向于共同的物种组合。根据我们的研究结果，我们认为小碎片会增加生态系统的结构和功能异质性，因此与大碎片在保护生物多样性方面同样重要。 [参考：12]

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