Effects of drying and orientation to perennial refuges on aquatic biodiversity across two basins differing in aridity
Effects of drying and orientation to perennial refuges on aquatic biodiversity across two basins differing in aridity
复制标题
干燥和常年避难所的方向对两个不同干旱流域水生生物多样性的影响
DOI：
10.1002/ecs2.4071
复制
发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
Bogan, Michael T.
中科院分区：
文献类型：
--
作者：
Gill, Brian A.;Sanabria, Anthony;Gonzales, Miranda;Carlson, Stephanie M.;Bogan, Michael T.
间歇流分布于全球，占全球河网长度的一半以上，预计将变得更加普遍。然而，大多数关于间歇流的研究都是在极端尺度下进行的，在分类和时间范围上受到限制，并且只关注干燥模式。在这里，我们评估了在两个干旱程度不同的间歇河流流域中，水流间歇性和向多年生避难所的方向如何影响水生无脊椎动物和水生和半水生脊椎动物。我们用测井仪来表征水流的间歇性，用干湿测绘来确定河段的多年生避难所的方向。2015年和2016年冬季和夏季，我们收集和鉴定了无脊椎动物，并对脊椎动物进行了目测调查。利用距离矩阵的多变量方差分析发现，在干旱地区，无脊椎动物群落在流域、多年生或间歇流类和季节之间存在明显差异，脊椎动物群落在流域、流类和季节之间存在明显差异。无脊椎动物群落的β多样性在干旱盆地高于中度盆地，而脊椎动物群落的β多样性则相反。我们确定了所有流域和流级组合、两个流域组合的多年生河段、每个流域组合的多年生河段以及流域内流级和季节组合的指示物种。水流的间断性和朝向多年生避难所的预测因子与无脊椎动物和脊椎动物群落都有很好的相关性。然而，我们没有发现社区的筑巢性与偶然预期的显著不同，以响应不断增加的流动间歇性或到避难所的距离。最后，盆地、水流间断性和朝向多年生避难所的方向对类群丰富度和密度的模拟具有重要意义，丰富度和密度随水流间断性的增加和距离的增加而降低。总的来说，我们的数据表明间歇性溪流拥有独特的生物多样性，但也表明一些分类群对间歇性和多年生避难所具有环境依赖性反应。这些发现还表明，未来河流干涸的增加很可能导致河流群落的变化，这些群落极有可能丧失水生生物多样性。
Intermittent streams are globally distributed, comprise over half the length of the global river network, and are expected to become more prevalent. However, most studies of intermittent streams are conducted at extremes of scale, are limited in taxonomic and temporal scope, and focus exclusively on drying patterns. Here, we assessed how both flow intermittency and orientation to perennial refuges affect aquatic invertebrates and aquatic and semiaquatic vertebrates across 2 years within two intermittent river basins differing in their aridity. We used loggers to characterize flow intermittency and wet–dry mapping to determine orientation to perennial refuges of reaches. In winter and summer 2015 and 2016, we collected and identified invertebrates and visually surveyed vertebrates. Using permutational multivariate analyses of variance with distance matrices, we found distinct invertebrate communities by basin, flow class (perennial or intermittent), and season, and distinct vertebrate communities by basin, and between flow classes and seasons in the more arid basin. Invertebrate communities had higher beta diversity in the more arid than mesic basin, whereas the opposite was true for vertebrates. We identified indicator species for all combinations of basin and flow class, perennial reaches combined from both basins, each basin, and some combinations of flow class and season within basins. Flow intermittency and orientation to perennial refuge predictors correlated well with both invertebrate and vertebrate communities. However, we did not find nestedness of communities that differed significantly from that expected by chance in response to increasing flow intermittency or distance to refuges. Lastly, basin, flow intermittency, and orientation to perennial refuge predictors were generally important for modeling taxon richness and densities, and richness and densities decreased with increasing flow intermittency and distance to perennial refuges. Collectively, our data suggest that intermittent streams harbor unique biodiversity, but also that some taxa have context‐dependent responses to intermittency and orientation to perennial refuges. These findings also suggest that future increases in stream drying are likely to lead to changes to stream communities with high potential for the loss of aquatic biodiversity.
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影响因子：
5.9
作者：
Datry, T.;Larned, S. T.;Santos, A. N.
通讯作者：
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影响因子：
2.7
作者：
Drummond, Laura R.;McIntosh, Angus R.;Larned, Scott T.
通讯作者：
Larned, Scott T.
影响因子：
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作者：
Turner, Dale S.;Richter, Holly E.
通讯作者：
Richter, Holly E.
影响因子：
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作者：
R. Kawanishi;Mikio Inoue;R. Dohi;A. Fujii;Y. Miyake
通讯作者：
R. Kawanishi;Mikio Inoue;R. Dohi;A. Fujii;Y. Miyake
影响因子：
2.7
作者：
Davey, Andrew J. H.;Kelly, David J.
通讯作者：
Kelly, David J.