Landscape use by two opossums is shaped by habitat preferences rather than by competitive interactions
Landscape use by two opossums is shaped by habitat preferences rather than by competitive interactions
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两只负鼠的景观利用是由栖息地偏好决定的，而不是由竞争性相互作用决定的
DOI：
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发表时间：
2019
影响因子：
1.7
通讯作者：
M. D. Di Bitetti
中科院分区：
文献类型：
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作者：
P. Cruz;M. E. Iezzi;C. De Angelo;D. Varela;M. D. Di Bitetti
鉴于负鼠（Didelphis spp.）的系统发育接近和相似的形态，它们是研究促进或阻碍同域物种共存的因素以及更好地了解景观变化如何影响物种分布和栖息地利用的良好模型。为了这个目的，我们使用单种和两种占用模型使用的记录D。albiventris为优势种，D.在阿根廷大西洋森林的农业和保护景观进行的相机陷阱调查。我们评估了哪些因素决定了物种发生的概率：栖息地偏好或种间关系。我们还估计了物种之间的日常活动模式的重叠，并评估了D。aurita活动响应于D.白腹鱼在连续的天然林中，Didelphis aurita的占有率较高，而D. albiventris在植被结构不太复杂和更开放的碎片化森林中具有更高的占用概率，并且更接近建筑物。这两种负鼠几乎没有在松树种植园。共现模型和昼夜活动重叠的结果表明，D。奥瑞塔没有回避D。白腹鱼这两种负鼠的发生率最可能反映了每个物种对不同栖息地的不同适应，竞争性相互作用似乎在塑造它们目前的分布中起着次要作用。Didelphis albiventris可能取代D.这主要是由于环境条件的变化，这变得不利于后者，但促进了前者创造新的栖息地。
Given the phylogenetic proximity and similar morphology of opossums (Didelphis spp.), they are good models to study factors that facilitate or impede coexistence of syntopic species and to better understand how landscape changes affect species distributions and habitat use. For this purpose, we used single-species and two-species occupancy models using records of D. albiventris, considered the dominant species, and D. aurita from a camera-trap survey conducted in an agricultural and conservation landscape in the Atlantic Forest of Argentina. We evaluated which factors determined the probability of species occurrence: habitat preferences or interspecific relationships. We also estimated the overlap in daily activity patterns between species, and evaluated changes in D. aurita activity in response to the occupancy probability of D. albiventris. Didelphis aurita had higher occupancy probabilities in the continuous native forest, whereas D. albiventris had higher occupancy probabilities in fragmented forests with less complex and more open vegetation structure, and greater proximity to buildings. Both opossums were almost absent in pine plantations. Results of the co-occurrence models and the overlap in diel activity suggest that D. aurita is not avoiding D. albiventris. Occurrences of these two opossums most probably reflect different adaptations by each species to different habitats, and competitive interactions seem to play a minor role in shaping their current distributions. Didelphis albiventris may be replacing D. aurita mainly as a result of changing environmental conditions, which become unfavorable to the latter but promote the creation of new habitat for the former.