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Connectedness of land use, nutrients, primary production, and fish assemblages in oxbow lakes

机译:牛b湖土地利用,养分,初级生产和鱼类种群之间的联系

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We explored the strength of connectedness among hierarchical system components associated with oxbow lakes in the alluvial valley of the Lower Mississippi River. Specifically, we examined the degree of canonical correlation between land use (agriculture and forests), lake morphometry (depth and size), nutrients (total nitrogen and total phosphorus), primary production (chlorophyll-a), and various fish assemblage descriptors. Watershed (p < 0.01) and riparian (p = 0.02) land use, and lake depth (p = 0.05) but not size (p = 0.28), were associated with nutrient concentrations. In turn, nutrients were associated with primary production (p < 0.01), and primary production was associated with sunfish (Centrarchidae) assemblages (p < 0.01) and fish biodiversity (p = 0.08), but not with those of other taxa and functional guilds. Multiple chemical and biological components of oxbow lake ecosystems are connected to landscape characteristics such as land use and lake depth. Therefore, a top-down hierarchical approach can be useful in developing management and conservation plans for oxbow lakes in a region impacted by widespread landscape changes due to agriculture.
机译:我们探索了下密西西比河冲积河谷中与牛弓湖相关的分级系统组件之间的连通性强度。具体来说,我们研究了土地利用(农业和森林),湖泊形态(深度和大小),养分(总氮和总磷),初级生产(叶绿素-a)和各种鱼类组合之间的典范相关程度。流域(p <0.01)和河岸(p = 0.02)土地利用,湖泊深度(p = 0.05)而不是大小(p = 0.28)与养分含量相关。反过来,养分与初级生产相关(p <0.01),初级生产与翻车鱼(Centrarchidae)组合(p <0.01)和鱼类生物多样性(p = 0.08)相关,而与其他分类群和功能行会无关。牛b湖生态系统的多种化学和生物成分与土地利用和湖泊深度等景观特征相关。因此,自上而下的分级方法对于为受农业景观变化影响的地区的牛弓湖制定管理和保护计划很有用。

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