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Occurrence of lemurs in landscapes and their species-specific scale responses to habitat loss.
American Journal of Primatology ( IF 2.4 ) Pub Date : 2020-02-21 , DOI: 10.1002/ajp.23110
Travis S Steffens 1, 2, 3 , Fernando Mercado Malabet 1 , Shawn M Lehman 1
Affiliation  

Studies on the impact of habitat loss on species occurrence consistently find that the amount of habitat (measured as patch area) is a major determinant of species occurrence at a patch-level. However, patch-level research may fail to detect important patterns and processes only observable at a landscape-level. A landscape-level approach that incorporates species-specific scale responses is needed to better understand what drives species occurrence. Our aim was to determine the landscape-level scale of effect of habitat amount on the occurrence of three species of nocturnal lemurs (Cheirogaleus medius, Microcebus murinus, and M. ravelobensis). We surveyed line transects to determine the occurrence of three lemur species within a fragmented landscape of deciduous dry forest and anthropogenic grassland in northwestern Madagascar. To determine the scale of effect of habitat loss on lemur occurrence, we compared logistic regression models of occurrence against habitat amount among eight different landscape scales using Akaike's Information Criterion values. We found differing scale responses among the lemurs in our study. Occurrence of C. medius responded to habitat amount at scales between 0.5-4 ha, M. murinus at scales between 1 and 4 ha and M. ravelobensis at scales between 0.125 and 4 ha. We suggest that the scale of effect for C. medius is mediated by their ability to hibernate. A relatively lower scale-response for Microcebus spp. likely reflect their omnivorous diet, small habitat requirements, and limited dispersal ability. Differences in scale responses between M. murinus and M. ravelobensis are likely a result of differing dispersal ability and responses to edge effects between these species. Our study is among the first on lemurs to show the value of a landscape-level approach when assessing the effects of habitat loss on species occurrence.

中文翻译:

狐猴在景观中的发生及其对栖息地丧失的特定物种尺度反应。

关于生境丧失对物种发生的影响的研究一致发现,生境数量(以斑块面积衡量)是斑块级别物种发生的主要决定因素。但是,补丁程序级别的研究可能无法检测到仅在景观级别可观察到的重要模式和过程。需要一种结合物种特定尺度响应的景观方法,以更好地了解是什么驱动物种发生。我们的目的是确定栖息地数量对三种夜间狐猴(Cheirogaleus medius,Microcebus murinus和M. ravelobensis)的发生产生影响的景观水平尺度。我们调查了线样以确定在马达加斯加西北部的落叶干燥森林和人为草地的零散景观中三种狐猴物种的发生。为了确定栖息地丧失对狐猴发生的影响的规模,我们使用Akaike的Information Criterion值比较了八种不同景观尺度上发生率对栖息地数量的逻辑回归模型。在我们的研究中,我们发现了狐猴之间不同的规模反应。棉铃虫的发生对栖息地数量的响应在0.5-4公顷之间,鼠穆拉姆氏菌在1到4公顷之间,拉夫洛比梭菌在0.125到4公顷之间对栖息地数量有反应。我们建议,C。medius的休眠程度是由其休眠能力决定的。Microcebus spp的规模响应相对较低。可能反映了他们的杂食饮食,较小的栖息地要求和有限的传播能力。M. murinus和M.之间尺度反应的差异 ravelobensis可能是这些物种之间不同的分散能力和对边缘效应的响应的结果。我们的研究是第一个关于狐猴的研究,它在评估生境丧失对物种发生的影响时显示了景观一级方法的价值。
更新日期:2020-04-13
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