Small mammal community composition varies among Ozark glades

Small mammal community composition varies among Ozark glades
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奥扎克空地的小型哺乳动物群落组成各不相同

DOI:
10.1093/jmammal/gyz102
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发表时间:
2019
影响因子:
1.7
通讯作者:
Maher, Sean P
Maher, Sean P
中科院分区:
生物学3区
文献类型:
--
作者:
Beasley, Emily M;Maher, Sean P

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岛屿生物地理学理论(IBT)解释和估计岛屿和孤立的栖息地斑块之间的大规模生态模式。具体来说,IBT 预测,由于局部殖民和灭绝,每个栖息地斑块的物种数量会随着面积和隔离的变化而变化。物种丰富度的准确估计对于检验 IBT 的预测至关重要,但物种可检测性的差异可能会导致经验数据的偏差。分层群落模型通过利用整个群落的信息来估计物种特定的占用率和检测概率,从而纠正不完美的检测。使用支离破碎的奥索卡空地作为我们的模型系统,我们构建了一个分层群落模型,以 1)估计小型哺乳动物的地点水平和区域物种丰富度,同时纠正检测误差,2)确定驱动占用的环境协变量。我们于 2016 年至 2017 年夏季对密苏里州西南部的 16 个空地进行了采样,并对空地网络内的哺乳动物群落结构进行了量化。检测到的物种库包括 8 个物种,模型得出的区域物种估计值为 8.6 个物种,平均每个林间空地有 3.47 个物种。物种丰富度随着斑块面积的增加而增加,但不随隔离度的增加而增加,并且斑块形状的影响因群落中的物种而异。
Island biogeography theory (IBT) explains and estimates large-scale ecological patterns among islands and isolated habitat patches. Specifically, IBT predicts that the number of species per habitat patch differs as a function of area and isolation as a result of local colonization and extinction. Accurate estimates of species richness are essential for testing predictions of IBT, but differences in detectability of species can lead to bias in empirical data. Hierarchical community models correct for imperfect detection by leveraging information from across the community to estimate species-specific occupancy and detection probabilities. Using the fragmented Ozark glades as our model system, we constructed a hierarchical community model to 1) estimate site-level and regional species richness of small mammals while correcting for detection error, and 2) determine environmental covariates driving occupancy. We sampled 16 glades in southwestern Missouri in summer 2016–2017 and quantified mammal community structure within the glade network. The detected species pool included eight species, and the model yielded a regional species estimate of 8.6 species, with a mean of 3.47 species per glade. Species richness increased with patch area but not isolation, and effects of patch shape varied between species in the community.
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