Where nothing stands still: quantifying nomadism in Australian arid-zone birds
Where nothing stands still: quantifying nomadism in Australian arid-zone birds
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DOI：
10.1007/s10980-021-01343-2
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发表时间：
2021-10-10
影响因子：
5.2
通讯作者：
Willis, Stephen G.
中科院分区：
文献类型：
--
作者：
Gibson, Michelle R.;Runge, Claire A.;Willis, Stephen G.
游牧是一种应对非季节性环境变化的迁移策略。游牧物种运动的知识是穷人，但有必要了解生活史和制定适当的保护战略。目标我们提供了第一个量化的游牧在澳大利亚的干旱鸟类群落，这被认为是高度游牧，通过测量物种的发生和丰富的变化，以确定是否有明确的游牧和非游牧的战略家。方法2012 - 2016年每年对鸟类进行调查。我们测量了每个物种在一个地点存在的年份，并估计了物种丰度的年际变化，使用这两种方法来推断物种的运动模式。我们使用结果为现有的运动分类提供信息。结果干旱区植物群落中多数物种的生境持久性较低，在同一生境中发现的物种数平均为1.8个。迁移沿着一个连续体而变化，而不是分为不同的游牧和非游牧群体。被归类为游牧的物种表现出较高的丰度和较低的网站持久性比被归类为居民的物种的变化。我们的方法量化游牧密切复制现有的专家得出的干旱区鸟类的运动分类。结论在我们的研究中，许多物种的运动可能严重依赖于环境，而不是一个固定的属性，单个物种的个体可以在不同的时间和地点显示连续的运动。这使物种保护变得复杂，但对物种运动复杂性的日益认识为更细致地理解物种与环境之间的关系提供了机会。
Context Nomadism is a movement strategy in response to non-seasonal environmental variability. Knowledge of nomadic species movements is poor but is necessary to understand life histories and develop appropriate conservation strategies. Objectives We provide a first quantification of nomadism among Australia's arid bird community, which is presumed to be highly nomadic, by measuring variation in species' occurrence and abundance among years to determine whether there are clear nomadic and non-nomadic strategists. Methods We surveyed birds annually from 2012 to 2016. We measured how many years each species was present at a site and estimated inter-annual variability in species abundance, using both measures to infer species movement patterns. We used results to inform existing movement classifications. Results Most arid species showed low site persistence, with species detected at the same site, on average, 1.8 out of the five survey years. Movement varied along a continuum rather than grouping into distinct nomadic and non-nomadic groups. Species classified as nomadic showed higher variation in abundance and lower site persistence than species classified as resident. Our method of quantifying nomadism closely replicated existing expert-derived movement classifications of arid zone bird species. Conclusions Rather than a fixed attribute, movements of many species in our study can be heavily environment-dependent, and individuals of a single species can display a continuum of movements in different times and places. This complicates the conservation of species, but the growing recognition of the complexity of species movements offers opportunities for a more nuanced understanding of the relationship between species and environment.