Abstract：
Understanding diversity patterns and underlying drivers is one of the central topics in the fields of biogeography and community ecology. Aquatic macroinvertebrates are widely distributed in various wetlands and play vital ecological roles. Previous studies mainly have focused on macroinvertebrate diversity in a single type of wetland. Our understanding of the differences in diversity patterns and underlying drivers between different wetland types remains limited. Here, we compared diversity patterns and community assembly of floodplain wetlands (FWs) and non-floodplain wetlands (NWs) in the Sanjiang Plain, Northeast China. We found that the taxonomic richness and abundance were higher in NWs than those in FWs. Nineteen taxa were identified as habitat specialists in the NWs, whereas only four taxa were designated as habitat specialists in the FWs. In addition, the FW and NW assemblages exhibited contrasting compositions. Spatial and environmental variables explained the largest variations in the macroinvertebrate assemblages of NWs and FWs, respectively. Normalised stochasticity ratios and Sloan neutral models confirmed that the macroinvertebrate community assembly of both wetland types was driven largely by stochastic processes. Stochastic processes were more prominent in shaping macroinvertebrate communities of FWs, whereas a stronger dispersal limitation was detected in NWs. Our results revealed contrasting diversity patterns and assembly mechanisms of macroinvertebrate communities in FWs and NWs. We underscore the importance of flood disturbance in shaping wetland ecosystems in the Sanjiang Plain and highlight that conservation and restoration actions cover different types of wetland habitats.
摘要：
了解多样性模式和潜在驱动因素是生物地理学和社区生态学领域的中心主题之一。水生大型无脊椎动物在各种湿地中分布广泛，发挥着重要的生态作用。以往的研究主要集中在单一类型湿地中的大型无脊椎动物多样性。我们对不同湿地类型之间多样性模式和潜在驱动因素的差异的理解仍然有限。这里,我们比较了三江平原洪泛区湿地（FWs）和非洪泛区湿地（NWs）的多样性模式和群落聚集，中国东北。我们发现，NW的分类丰富度和丰度高于FW。19个分类群被确定为NW的栖息地专家，而FW中只有四个分类群被指定为栖息地专家。此外,FW和NW组合表现出对比的组成。空间和环境变量解释了NW和FW的大型无脊椎动物组合的最大变化，分别。归一化的随机性比和Sloan中性模型证实，两种湿地类型的大型无脊椎动物群落组装在很大程度上是由随机过程驱动的。随机过程在塑造大型无脊椎动物群落中更为突出，而在NW中检测到更强的分散限制。我们的结果揭示了FW和NW中大型无脊椎动物群落的多样性模式和组装机制。我们强调了洪水扰动在塑造三江平原湿地生态系统中的重要性，并强调了保护和恢复行动涵盖了不同类型的湿地栖息地。
