Rakotondranary S Jacques, Ganzhorn Jörg U
Department of Animal Ecology and Conservation, University of Hamburg, Biozentrum Grindel, Hamburg, Germany.
Folia Primatol (Basel). 2011;82(4-5):212-23. doi: 10.1159/000334816. Epub 2012 Jan 12.
We investigated whether or not habitat structure contributes to the separation of two sister species of lemurs and their hybrids. For this, we studied Microcebus murinus and M. griseorufus along a continuous vegetation gradient where populations of the two species occur in sympatry or in allopatry. In allopatry, the two species are generalists without any sign of microhabitat selectivity. In sympatry, both species differed significantly and discriminated against certain habitat structures: M. murinus was found in microhabitats with larger trees than average while M. griseorufus utilized microhabitats with smaller trees. Hybrids between the two species did not show any significant discrimination for or against microhabitat structure and did not differ in their habitat utilization from either parent species. Both species can go into torpor and hibernation. M. griseorufus is seen more frequently during the cool dry season than M. murinus. We assume that M. murinus goes into extended torpor or hibernation more frequently than M. griseorufus. We interpret the different occurrence of large-sized trees in microhabitats of M. murinus as a prerequisite for M. murinus to be able to spend extended periods of time in tree holes that are isolated and allow hibernation at reduced temperature levels.
我们研究了栖息地结构是否有助于狐猴的两个姐妹物种及其杂种的分离。为此，我们沿着一个连续的植被梯度研究了小鼠狐猴（Microcebus murinus）和灰红狐猴（M. griseorufus），这两个物种的种群在同域或异域分布。在异域分布中，这两个物种是泛化种，没有任何微生境选择性的迹象。在同域分布中，这两个物种有显著差异，并对某些栖息地结构有偏好：小鼠狐猴出现在树木比平均尺寸更大的微生境中，而灰红狐猴利用树木较小的微生境。这两个物种之间的杂种对微生境结构没有表现出任何显著的偏好或排斥，并且在栖息地利用方面与任一亲本物种没有差异。这两个物种都可以进入蛰伏和冬眠状态。在凉爽干燥的季节，灰红狐猴比小鼠狐猴更频繁地出现。我们假设小鼠狐猴比灰红狐猴更频繁地进入长时间的蛰伏或冬眠状态。我们将小鼠狐猴微生境中大型树木的不同出现情况解释为小鼠狐猴能够在隔离的树洞中长期停留并在较低温度水平下冬眠的先决条件。
