Elevational gradients of species richness, community structure, and niche occupation of tropical rove beetles (Coleoptera: Staphylinidae: Steninae) across mountain slopes in Northern Thailand
Elevational gradients of species richness, community structure, and niche occupation of tropical rove beetles (Coleoptera: Staphylinidae: Steninae) across mountain slopes in Northern Thailand
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DOI：
10.1007/s10682-020-10036-2
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发表时间：
2020-04-01
影响因子：
1.9
通讯作者：
Puthz, Volker
中科院分区：
文献类型：
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作者：
Betz, Oliver;Srisuka, Wichai;Puthz, Volker
我们评估的物种丰富度，异质性，生态位占领，和群落结构/相似性的隐翅虫亚科Steninae在整个海拔2500米的热带山区在北方泰国的模式。捕食性Steninae从各种生境类型收集。随着海拔的增加，索伦森差异的增加被解释为物种周转（特别是在低海拔地区）和物种数量的下降（特别是在海拔> 1400米）。与物种数量随海拔升高而急剧下降不同，物种密度（即，物种总数除以各海拔带采集点的数量）的下降幅度要平缓得多，表明物种数量的负梯度是由山脉形状所固有的土地面积效应叠加而成的。在枯落物栖息物种和瀑布相关物种中，物种数量均呈现中海拔高峰。物种频率呈正相关，海拔（“Dianous”和Stenus）和栖息地生态位宽度（Stenus只）。Stenus表现出高种间多样性的宽到窄的生态位宽度的海拔和栖息地。古北界和东方种的数量偏离统计预期，表明气候生态位保守性在其海拔分布中发挥了作用。“Dianous”甲虫的分布模式，其强大的湿生生物的喜好与岩石在流水和瀑布，可能解释的源-汇动态沿着山溪。
We evaluated patterns of species richness, heterogeneity, niche occupation, and community structuring/similarity of staphylinid beetles of the subfamily Steninae across a 2500-m elevational gradient of a tropical mountain area in Northern Thailand. Predaceous Steninae were collected from a variety of habitat types. Increasing Sorensen dissimilarity with increasing elevation was explained by both species turnover (especially across the lower elevational zones) and declining numbers of species (especially across elevations > 1400 m). Unlike the strong decline of the number of species with increasing elevation, species density (i.e., total number of species divided by the number of collection sites at the respective elevational zone) showed a much smoother decline suggesting that the negative gradient in the number of species was superimposed by a land-area effect inherent in mountain shape. In both the litter-inhabiting species and waterfall-associated species, the numbers of species showed a mid-elevational peak. Species frequency was positively correlated to both elevational ("Dianous" and Stenus) and habitat niche width (Stenus only). Stenus showed high interspecific variety of wide to narrow niche widths for both elevation and habitat. Numbers of Palearctic and Oriental species deviated from statistical expectation, suggesting that climate niche conservatism has played a role in their elevational distribution. The distributional patterns of "Dianous" beetles, with their strong hygrobiont preferences associated with rocks in running water and waterfalls, are potentially explained by source-sink dynamics along mountain streams.