Metacommunity patterns of Amazonian Odonata: the role of environmental gradients and major rivers
Metacommunity patterns of Amazonian Odonata: the role of environmental gradients and major rivers
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DOI：
10.7717/peerj.6472
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发表时间：
2019-05-06
期刊：
影响因子：
2.7
通讯作者：
Hortal, Joaquin
中科院分区：
文献类型：
--
作者：
Alves-Martins, Fernanda;Brasil, Leandro Schlemmer;Hortal, Joaquin
背景。我们对巴西亚马逊地区豆娘（裂翅目）和蜻蜓（异翅目）元群落进行了鉴定和分类，将物种分布模式与已知的生物梯度和生物地理历史联系起来。我们期望双翅目和异翅目在间隔内的随机分布。在亚马逊尺度上，我们预计异翅目元群落的分布是随机的，因为它们具有更高的扩散能力和更大的环境耐受性。相比之下，我们预计夜翅目群落将呈现克莱门特模式，由于其低扩散能力而受到亚马孙大河的限制。我们使用了一个数据集，其中包含了亚马逊河流域4个一到三阶采样良好的溪流，并应用了元群落结构元素（EMS）框架的扩展，其中我们通过已知的空间和生物地理预测因子对双翅目和异翅目元群落进行了排序。在亚马逊尺度上，双翅目和异翅目在生物地理区域（间隙）、年平均温度、生境完整性和年降水量等环境和生物地理因子的驱动下均呈现克莱门特模式。在干预量表上，结果不太一致，仅部分支持我们的假设。圭亚那的夜翅目元群落和Tapajes的异翅目元群落被分类为随机的，表明中性过程在较小的空间尺度上更重要。我们的发现与之前的研究一致，表明环境梯度和主要河流限制了大腹蛇群落的分布，支持较大的亚马逊河流作为该群体扩散的障碍。此外，生境完整性的重要性表明，河岸植被的完整性是塑造亚马逊河河川元群落结构的重要过滤器。
Background. We identified and classified damselfly (Zygoptera) and dragonfly (Anisoptera) metacommunities in Brazilian Amazonia, relating species distribution patterns to known biological gradients and biogeographical history. We expected a random distribution of both Zygoptera and Anisoptera within interfluves. At the Amazonian scale, we expected Anisoptera metacommunities to be randomly distributed due to their higher dispersal ability and large environmental tolerance. In contrast, we expected Zygoptera communities to exhibit a Clementsian pattern, limited by the large Amazonia rivers due to their low dispersal ability.Methods. We used a dataset of 58 first-to-third order well-sampled streamlets in four Amazonian interfluves and applied an extension of the Elements of Metacommunity Structure (EMS) framework, in which we order Zygoptera and Anisoptera metacommunities by known spatial and biogeographic predictors.Results. At the Amazonian scale, both Zygoptera and Anisoptera presented a Clementsian pattern, driven by the same environmental and biogeographical predictors, namely biogeographic region (interfluve), annual mean temperature, habitat integrity and annual precipitation. At the interfiuve scale, results were less consistent and only partially support our hypothesis. Zygoptera metacommunities at Guiana and Anisoptera metacommunities at Tapajes were classified as random, suggesting that neutral processes gain importance at smaller spatial scales.Discussion. Our findings were consistent with previous studies showing that environmental gradients and major rivers limit the distribution of Odonata communities, supporting that larger Amazonian rivers act as barriers for the dispersal of this group. In addition, the importance of habitat integrity indicates that intactness of riparian vegetation is an important filter shaping metacommunity structure of Amazonian stream Odonata.