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首页> 外文OA文献 >Effects of Changing Vegetation Composition on Community Structure, Ecosystem Functioning, and Predator–Prey Interactions at the Saltmarsh-Mangrove Ecotone
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Effects of Changing Vegetation Composition on Community Structure, Ecosystem Functioning, and Predator–Prey Interactions at the Saltmarsh-Mangrove Ecotone

机译：改变植被组成对Saltmarsh-Mangrove Ecotone的群落结构，生态系统功能和捕食者 - 猎物交互的影响

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Decreasing frequency of freeze events due to climate change is enabling the poleward range expansion of mangroves. As these tropical trees expand poleward, they are replacing herbaceous saltmarsh vegetation. Mangroves and saltmarsh vegetation are ecosystem engineers that are typically viewed as having similar ecosystem functions. However, few studies have investigated whether predation regimes, community structure, and ecosystem functions are shifting at the saltmarsh-mangrove ecotone. In this study, we manipulated predator access to marsh and mangrove creekside habitats to test their role in mediating vegetation and invertebrate structure and stability in a two-year experiment. We also conducted a survey to evaluate how shifting vegetation is modifying structural complexity, invertebrate communities, and ecosystem functioning at the ecotone. Excluding larger (> 2 cm diameter) predators did not affect vegetation or invertebrate structure or stability in either saltmarsh or mangrove habitats. The survey revealed that the two habitat types consistently differ in structural metrics, including vegetation height, inter-stem distance, and density, yet they support similar invertebrate and algal communities, soil properties, and predation rates. We conclude that although mangrove range expansion immediately modifies habitat structural properties, it is not altering larger predator consumptive effects, community stability, community composition, or some other ecosystem functions and properties at the ecotone.
机译：降低由于气候变化导致的冻结事件的频率正在实现红树林的极向扩展。随着这些热带树膨胀的原因，它们正在取代草本盐养生植被。红树林和Saltmarsh植被是生态系统工程师，通常被视为具有相似的生态系统功能。然而，很少有研究已经调查了捕食制度，社区结构和生态系统功能是否在Saltmarsh-Mangrove Ecotone转变。在这项研究中，我们操纵沼泽地和红树林栖息地溪畔捕食者访问，以测试他们在为期两年的实验介导植物和无脊椎动物的结构和稳定性的作用。我们还进行了一项调查，以评估转移植被如何修改体内遗传物的结构复杂性，无脊椎动物社区和生态系统。排除较大（> 2厘米直径）捕食者不会影响植被或无脊椎动物结构或盐沼或红树林栖息地的稳定性。调查显示，两种栖息地类型在结构度量中始终如一地不同，包括植被高度，茎间距离和密度，但它们支持类似的无脊椎动物和藻类社区，土壤性质和捕食率。我们得出结论，虽然红树林范围扩张立即改变栖息地结构性质，但它没有改变更大的捕食者消费效果，社区稳定，社区组成，或在Ecotone的其他一些生态系统功能和属性。

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