Elevation and climatic tolerance: a test using dung beetles
Elevation and climatic tolerance: a test using dung beetles
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DOI：
10.2307/3546663
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发表时间：
1999-09-01
期刊：
影响因子：
3.4
通讯作者：
Chown, SL
中科院分区：
文献类型：
--
作者：
Gaston, KJ;Chown, SL
随着海拔的增加，物种在群落中出现的海拔范围增加，这被解释为个体生物必须能够在更高海拔承受更广泛的气候条件的结果;气候变异性假说。在这里，我们表明，圣甲虫粪甲虫（26种）跨越海拔样带（约。2500 In）在南部非洲的热耐受范围确实随着个体和物种之间海拔的增加而增加。最大热耐受范围随海拔升高而缓慢增加，最小热耐受范围随海拔升高而迅速增加。变化的机械基础似乎是一个快速变化的临界热最小值（CTmin）与海拔和只有小的变化，临界热最大值（CTmax）。当然，即使气候变异性假说所假设的物种耐受模式是正确的，也不一定会出现海拔范围随海拔增加而增加的情况。然而，虽然取样有限，但这一物种组合的海拔高度范围似乎有所增加。
An increase in the altitudinal range of occurrence of species in an assemblage with increasing elevation has been explained as a consequence of individual organisms having to be able to withstand a broader range of climatic conditions at higher elevations; the climatic variability hypothesis. Here we show that for scarab dung beetles (26 species) across an elevational transect (approx. 2500 In) in southern Africa thermal tolerance range does increase with increasing elevation across individuals and across species. The maximal thermal tolerance range exhibited increases slowly with elevation and the minimum range increases more rapidly. The mechanistic basis of the change appears to be one of rapidly changing critical thermal minimum (CTmin) with elevation and only small changes in critical thermal maximum (CTmax). Of course, even if the pattern of tolerance of species assumed by the climatic variability hypothesis is correct, an increase in altitudinal range with increasing elevation need not necessarily follow. However, although sampling has been limited, there does appear to be an elevational increase in altitudinal range for this species assemblage.