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Morphometric signals of population decline in diademed sifakas occupying degraded rainforest habitat in Madagascar

机译:马达加斯加退化雨林栖息地中已退化的锡法卡人种群减少的形态计量信号

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摘要

Anthropogenic habitat change can have varied impacts on primates, including both negative and positive outcomes. Even when behavioural shifts are seen, they may reflect decreased health, or simply behavioural flexibility; understanding this distinction is important for conservation efforts. This study examines habitat-related variation in adult and immature morphometrics among diademed sifakas (Propithecus diadema). We collected morphometric data from sifakas at Tsinjoarivo, Madagascar (19 years, 188 captures, 113 individuals). Captures spanned 12 groups, five within continuous forest (“CONT”), and seven in degraded fragments (“FRAG”) where sifakas have lower nutritional intakes. Few consistent differences were found between CONT and FRAG groups. However, using home range quality as a covariate rather than a CONT/FRAG dichotomy revealed a threshold: the two FRAG groups in the lowest-quality habitat showed low adult mass and condition (wasting), and low immature mass and length (stunting). Though less-disturbed fragments apparently provide viable habitat, we suggest the sifakas in the most challenging habitats cannot evolve fast enough to keep up with such rapid habitat change. We suggest other long-lived organisms will show similar morphometric “warning signs” (wasting in adults, stunting in immatures); selected morphometric variables can thus be useful at gauging vulnerability of populations in the face of anthropogenic change.
机译:人为栖息地的变化可能会对灵长类动物产生不同的影响,包括负面和正面结果。即使看到行为转变,也可能反映出健康状况的下降,或者仅仅是行为上的灵活性。理解这种区别对于保护工作很重要。这项研究检查了成年的sifakas(Propithecus diadema)的成年和未成熟形态计量学中与栖息地相关的变化。我们从马达加斯加的Tsinjoarivo的sifakas收集了形态计量学数据(19年,188次捕获,113个人)。捕捞物分为12个组,其中5个位于连续森林(“ CONT”)内,另外7个处于降解片段(“ FRAG”)内,其中sifakas营养摄入较低。 CONT和FRAG组之间几乎没有一致的差异。但是,使用家庭范围质量作为协变量而不是CONT / FRAG二分法显示了一个阈值:质量最低的栖息地中的两个FRAG组的成年质量和状况(消瘦)低,未成熟的质量和长度(发昏)低。尽管受干扰程度较小的碎片显然提供了可行的栖息地,但我们建议最具挑战性的栖息地中的sifakas不能足够快地进化以适应如此迅速的栖息地变化。我们建议其他长寿的生物体会显示出类似的形态“警告信号”(成年成年,发育不良)。因此,选择的形态计量学变量可用于衡量面对人为变化的人群的脆弱性。

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