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首页> 外文期刊>Marine ecology progress series >Sedimentation and light penetration interact to maintain heterogeneity of subtidal habitats: algal versus invertebrate dominated assemblages
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Sedimentation and light penetration interact to maintain heterogeneity of subtidal habitats: algal versus invertebrate dominated assemblages

机译：沉积物和光的渗透相互作用以维持潮下生境的异质性：藻类与无脊椎动物为主的组合

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One of the most striking and widespread patterns observed on subtidal rocky reefs is that up-facing surfaces are monopolized by algae, whereas down-facing surfaces are dominated by sessile invertebrates. This study experimentally assessed the model that light and sedimentation interact with surface orientation to maintain this pattern of habitat heterogeneity. We tested the hypothesis that if epibiotic assemblages on down-facing surfaces were rotated to face upward, then the least change in assemblage structure would occur on shaded surfaces with reduced rates of sedimentation. In general, the alternate states of algal vs invertebrate dominated assemblages appeared to be primarily maintained by light intensity, which facilitated the cover of algae on up-facing surfaces (full light) and invertebrates on down-facing surfaces (reduced light). Although sedimentation was only partially responsible for differences between habitat types, it acted as a negative disturbance on the abundance of algae and survivorship of invertebrates. When combined with differences in light intensity, high rates of sediment accumulation had slight negative effects under natural light, but under shaded conditions these negative effects were substantially increased, causing changes to the structure of the whole assemblage. This result warns that attempts to identify the effects of sedimentation in isolation from light intensity, which depends on factors such as turbidity, may not reveal the true effects of sedimentation on epibiotic assemblages. The ability of invertebrates to withstand high rates of sediment accumulation was related to their morphology, whereby erect forms growing above accumulated sediments had greater rates of survivorship than prostrate growth forms, which tended to be smothered by sediments. To properly understand the physical processes of facilitation (e.g. light intensity) and disturbance (e.g. sedimentation) we need to assess them in meaningful combinations so that explanations of assemblage structure do not create the false impression that such processes, however complex, produce only small effects relative to other processes.
机译：在潮下礁石上观察到的最引人注目的和最普遍的模式之一是，朝上的表面被藻类所独占，而朝下的表面则由无脊椎动物组成。这项研究通过实验评估了光和沉积与表面取向相互作用以维持这种生境异质性模式的模型。我们检验了以下假设：如果朝下表面上的表观生物素组合旋转到面向上，则组合结构上的最小变化将发生在阴影表面上，沉降速率降低。通常，藻类与无脊椎动物为主的组合的交替状态似乎主要由光强度来维持，这有助于藻类在朝上的表面（全光）和无脊椎动物在朝下的表面（减弱的光）上覆盖。尽管沉积只是部分解释了生境类型之间的差异，但它却对藻类的丰富度和无脊椎动物的生存产生了负面影响。当结合光强度的差异时，高沉积物积累率在自然光下会产生轻微的负面影响，但是在阴影条件下，这些负面影响会大大增加，从而导致整个组件的结构发生变化。该结果警告说，试图从光强度中分离出沉降的影响的尝试可能无法揭示沉降对表生生物组合的真正影响，而光的强度取决于浊度等因素。无脊椎动物承受较高沉积物沉积速率的能力与其形态有关，因此，在堆积沉积物上方生长的直立形态的存活率要高于沉积物窒息的pro状生长形态。为了正确理解促进作用（例如光强度）和干扰作用（例如沉积）的物理过程，我们需要以有意义的组合进行评估，以使对组装结构的解释不会产生错误的印象，即这种过程无论多么复杂，只会产生很小的影响相对于其他过程。

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