Processes contributing to rotifer community assembly in shallow temporary aridland waters
Processes contributing to rotifer community assembly in shallow temporary aridland waters
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DOI：
10.1007/s10750-022-04842-8
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发表时间：
2022-03-30
期刊：
影响因子：
2.6
通讯作者：
Walsh, E. J.
中科院分区：
文献类型：
--
作者：
Brown, P. D.;Schroeder, T.;Walsh, E. J.
了解当地条件和扩散动力学如何构成被动分散的水生无脊椎动物群落仍然不确定，特别是在干旱系统中。在这些系统中，扩散是不规则的，成功的殖民化受制于优先效应。为了研究这些因素，我们比较了奇瓦瓦沙漠岩石池、playas和坦克的轮虫种类组成。(1)有132种不同位点间存在高β差异（> 0.8）。(2)各样地物种丰富度与生境面积呈显著相关性，但相关性较弱。(3)离散-生态位连续指数（DNCI）为负值的差异分析表明，随机过程主导了群落聚集。(4)研究了三个重要的环境变量：水期、藻席和大型植物的发育以及电导率对丰富度和群落结构的影响；我们还研究了轮虫营养类型（一种功能性状）如何影响DNCI并确定了指示物种。水期对playas和tanks很重要，但对岩石池却不重要。电导率有很强的影响。丰富度在植被最多的生境中最大。环境因素解释了大约12%的群落组成变化，这表明虽然确定性过程很重要，但随机过程在这些系统中占主导地位。我们提供了一个概念模型，突出了与温带地区相比，干旱地区自然水生群落的独特性。
Understanding how local conditions and dispersal dynamics structure communities of passively dispersing aquatic invertebrates remains uncertain, especially in aridland systems. In these systems, dispersal is irregular and successful colonization is subject to priority effects. To investigate these factors, we compared rotifer species composition from Chihuahuan Desert rock pools, playas, and tanks. (1) We found 132 species with high beta-dissimilarity among sites (> 0.8). (2) Correlation between species richness and habitat area was significant, but weak, for all sites. (3) Dissimilarity analyses, supported by negative Dispersal-Niche Continuum Index (DNCI) values, showed that stochastic processes dominate community assembly. (4) We examined influence of three important environmental variables on richness and community structure: hydroperiod, algal mat and macrophyte development, and conductivity; we also examined how rotifer trophi type (a functional trait) affected DNCI and identified indicator species. Hydroperiod was important for playas and tanks, but not rock pools. Conductivity had a strong influence. Richness was greatest in habitats with highest amounts of vegetation. Environmental factors explained similar to 12% of variation in community composition, indicating that while deterministic processes are significant, stochastic processes dominate in these systems. We provide a conceptual model that highlights the distinctive of nature aquatic communities in aridlands compared to temperate regions.