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首页> 外文期刊>Marine ecology >Rapid invertebrate responses to macroalgal wrack: two novel field experiments on intertidal mudflats in SouthernAustralia
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Rapid invertebrate responses to macroalgal wrack: two novel field experiments on intertidal mudflats in SouthernAustralia

机译：无脊椎动物对大型藻类残骸的快速反应：澳大利亚南部潮间带滩涂的两个新野外实验

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Macroalgal wrack deposition along coasts is highly variable but it plays an important role in the structure and function of marine communities. To date, most research has focused on the effects of decomposing wrack as it assimilates into the system but little is known about the immediate effects of wrack when it is first deposited in the habitat. Freshly deposited wrack may either wash away after a short period (1-2days) or remain in the habitat and decay depending on tide and weather conditions. To understand the effects of this dynamic resource we experimentally manipulated wrack deposits on intertidal mudflats in Port Phillip Bay, Victoria, Australia. We conducted two experiments using defaunated patches of wrack (300g wet weight) that were a mixture of seagrass and macroalgae and measured community responses after 2days. The first experiment included real and artificial wrack patches to differentiate between taxa that responded to the biological and physical structure of the wrack. The second experiment used multiple wrack patches to investigate responses to a focal wrack patch that was surrounded by varying numbers of wrack additional patches (0, 2 or 4x300g wet weight of wrack). Overall, wrack increased abundances of invertebrates and changed their distributions throughout the wrack and underlying sediment habitat. Mechanisms responsible for immediate taxa responses to the wrack related to the physical structure in the habitat and not biological attributes associated with the real patches. Ostracods and leptostracans were the exception to these patterns with colonization only occurring in real wrack and not the artificial wrack. In the multiple patch experiment the majority of the fauna moved vertically into the wrack from the bare sediment and not between surrounding patches of wrack. We suggest that specific characteristics, such as invertebrate mobility, feeding mode and sensitivity to changes in sediment condition, are important factors that influence individual taxa and overall community responses. Understanding the interactive effects of these characteristics with the characteristics of the wrack (magnitude, frequency, spatial arrangement and composition) is the key to developing predictive models that will inform the management of wrack in marine coastal habitats.
机译：沿海大型藻类残骸的沉积变化很大，但在海洋群落的结构和功能中起着重要作用。迄今为止，大多数研究都集中在分解残骸吸收到系统中时所产生的影响，但是对于残骸最初沉积在栖息地中时的即时影响知之甚少。新鲜沉积的残骸可能会在短时间（1-2天）后被冲走，或者会保留在栖息地中并根据潮汐和天气条件而腐烂。为了了解这种动态资源的影响，我们通过实验对澳大利亚维多利亚州菲利普港湾潮间带滩涂的残骸进行了处理。我们使用海藻和大型藻类混合物混合的残骸（湿重300克）进行了两个实验，并在2天后测量了群落响应。第一个实验包括真实的和人工的残骸补丁，以区分对残骸的生物和物理结构有响应的分类单元。第二个实验使用多个残骸补丁来研究对局部残骸补丁的响应，该残骸被不同数量的残骸附加补丁包围（0、2或4x300g湿重的残骸）。总体而言，沉船增加了无脊椎动物的数量，并改变了其在沉船和下层沉积物生境中的分布。负责对残骸进行即时分类分类反应的机制与栖息地的物理结构有关，而不是与实际斑块有关的生物学特性。这些模式的例外是兽脚类和钩端螺旋体，仅在真正的残骸而不是人工残骸中发生定殖。在多斑块实验中，大多数动物区系都是从裸露的泥沙垂直移入残骸的，而不是在周围的残骸斑块之间。我们建议特定的特征，例如无脊椎动物的活动能力，进食方式和对沉积物状况变化的敏感性，是影响单个分类群和整体社区反应的重要因素。了解这些特征与残骸特征（幅度，频率，空间布置和组成）的交互作用，是开发预测模型的关键，该模型将为沿海沿海生境的残骸管理提供信息。

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