Determinants of species richness, endemism and turnover in European longhorn beetles
Determinants of species richness, endemism and turnover in European longhorn beetles
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DOI：
10.1111/j.0906-7590.2008.5335.x
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发表时间：
2008-04-01
期刊：
影响因子：
5.9
通讯作者：
Baselga, Andres
中科院分区：
文献类型：
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作者：
Baselga, Andres
本研究评估了欧洲天牛科昆虫的多样性格局，并检验了以下假设：1）该高度多样性类群的丰富度梯度是由水和能量变量驱动的; 2）特有性是由相同的因素解释的，但地区之间的差异也反映了冰后期的再殖民过程;（3）区系组成由相同的气候变量决定，因此，β多样性（物种更替）与丰富度梯度有关。物种丰富度，特有性和β多样性进行建模，使用库存的37个欧洲领土，从一个数据库中包含609种的分布。面积，空间位置，和9个地形和气候变量被用作主坐标modeling.Species丰富度的回归和约束分析的预测因子主要是由温度梯度，产生了一个南到北递减的丰富度梯度解释。特有现象遵循同样的模式，但也取决于纵向变化，在大陆的西南角和东南角达到顶峰。区系周转解释了一个重要的纯粹的空间格局和空间结构的环境梯度。因此，与其他群体相反，天牛丰富度主要由环境能量解释，而不是由水的可用性。地方病主要集中在伊比利亚半岛和希腊半岛，而不是在意大利。因此，后一个地区可能是欧洲长角甲虫在冰川期后重新定居的主要来源，否则，在冰川期是一个贫穷的避难所。营业额模式是独立的丰富度梯度，因为北方动物群嵌套在南方的。营业额，丰富的对比，是由独立的气候和地理限制，可能反映扩散限制或随机殖民事件的影响，这表明丰富度梯度比营业额模式更环境决定性的现象。
This study assessed the diversity patterns of a large family of beetles, Cerambycidae, in Europe and tested the following hypotheses: 1) richness gradients of this hyperdiverse taxon are driven by water and energy variables; 2) endemism is explained by the same factors, but variation between areas also reflects post-glacial re-colonization processes; and 3) faunal composition is determined by the same climatic variables and, therefore, beta diversity (species turnover) is related to richness gradients. Species richness, endemism and beta diversity were modelled using inventories of 37 European territories, built from a database containing the distributions of 609 species. Area, spatial position, and nine topographical and climatic variables were used as predictors in regression and constrained analysis of principal coordinates modelling.Species richness was mostly explained by a temperature gradient, which produced a south-to-north decreasing richness gradient. Endemism followed the same pattern, but was also determined by longitudinal variation, peaking in the southwestern and southeastern corners of the continent. Faunal turnover was explained by an important purely spatial pattern and a spatially structured environmental gradient. Thus, contrary to other groups, cerambycid richness was mostly explained by environmental energy, but not by water availability. Endemism was concentrated in the Iberian and Greek peninsulas, but not in Italy. Thus, the latter area may have been the major source of post-glacial re-colonization for European longhorn beetles or, otherwise, a poor refuge during glaciations. Turnover patterns were independent of the richness gradient, because northern faunas are nested in southern ones. Turnover, in contrast to richness, was driven by both the independent effects of climate and geographic constraints that might reflect dispersal limitation or stochastic colonization events, suggesting that richness gradients are more environmentally deterministic phenomena than turnover patterns.