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首页> 外文期刊>Freshwater science >Modeling changes in freshwater mussel diversity in an agriculturally dominated landscape
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Modeling changes in freshwater mussel diversity in an agriculturally dominated landscape

机译：在农业主导的景观中模拟淡水贻贝多样性的变化

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Freshwater mussels perform critical ecosystem functions and provide many valuable ecological services. However, anthropogenic effects have severely decreased mussel diversity and abundance at both local and regional scales. Understanding how human disturbances, particularly landuse change, and fish assemblages are related to mussel assemblages is essential for effective conservation and restoration. We used Random Forests (RF) regressions, a data-mining technique, to examine how mussel species richness, total abundance, and abundances of individual species were related to land use at different spatial scales and to fish species richness and abundance in east central Illinois, USA. Mussel richness increased with % wetlands, % open water, % grassland in the riparian zone, and total fish abundance; decreased with % urban land in the riparian zone; but responded poorly to fish species richness and fish Index of Biotic Integrity (IBI) scores. Total mussel abundance mainly increased with total fish abundance and decreased with both % urban land in the riparian zone and road density. Of 8 mussel species modeled, the abundances of 3 were strongly related to total fish abundance or fish-host abundance, 3 with both fish abundance and land use, and 2 with land use and other physical variables. These findings can help researchers and resource managers explain the spatial variation of mussel assemblages and choose abiotic and biotic variables to monitor or manipulate for maintaining or restoring overall mussel diversity or the populations of individual species.
机译：淡水贻贝发挥关键的生态系统功能，并提供许多有价值的生态服务。然而，在地方和区域尺度上，人为影响已导致贻贝多样性和丰度严重降低。了解人为干扰，尤其是土地利用的变化以及鱼类种群与贻贝种群之间的关系，对于有效的保护和恢复至关重要。我们使用数据挖掘技术随机森林（RF）回归来检验贻贝物种丰富度，总物种丰富度和单个物种的丰富度与伊利诺伊州中东部不同空间尺度的土地利用以及鱼类物种丰富度和丰富度之间的关系， 美国。贻贝的丰富度随着湿地百分比，开放水百分比，河岸带草地的百分比以及鱼类的总丰度的增加而增加;随着河岸带城市土地百分比的降低而减少;但对鱼类物种丰富度和鱼类生物完整性指数（IBI）得分的反应较差。贻贝的总丰度主要随鱼类的总丰度而增加，而随着河岸带的城市土地百分比和道路密度的降低而降低。在建模的8种贻贝物种中，3种鱼的丰度与总鱼的丰度或鱼类寄主的丰富度密切相关，3种与鱼的丰度和土地利用都密切相关，2种与土地利用和其他物理变量有关。这些发现可以帮助研究人员和资源管理者解释贻贝组合的空间变化，并选择非生物和生物变量来监测或操纵以维持或恢复贻贝的整体多样性或单个物种的种群。

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