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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Sediment deposition dampens positive effects of substratum complexity on the diversity of macroalgal assemblages
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Sediment deposition dampens positive effects of substratum complexity on the diversity of macroalgal assemblages

机译：沉积物沉积减弱了基质复杂性对大型藻类组合多样性的积极影响

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摘要

A three-year experimental study was performed to evaluate the interactive effects of topographic complexity and sedimentation in determining the structure of rocky macroalgal assemblages. The following hypotheses were tested: i) the structure of macroalgal assemblages varies according to the complexity of the substratum; ii) high sediment deposition reduces variations in the structure of assemblages among substrata characterized by different complexity. At natural levels of sediment deposition, greater substratum complexity enhanced species richness and favored the development of assemblages dominated by architecturally complex species, such as large corticated Rhodophyta. Under high sediment deposition, turfs became the main component of macroalgal assemblages, although different filamentous forms responded differently to substratum complexity. In addition, high sediment deposition increased the abundance of the invasive Chlorophyta, Caulerpa cylindracea, on low complexity substrata, but decreased it on high complexity substrata. These results show that an increase in sediment deposition can dampen variations between assemblages associated to substrata characterized by different complexity, with consequent reduction of both alpha (i.e., species loss) and beta diversity (i.e., decreased small-scale variation in community structure). (C) 2015 Elsevier B.V. All rights reserved.
机译：进行了为期三年的实验研究，以评估地形复杂性和沉积在确定岩石大型藻类组合体结构方面的相互作用。测试了以下假设：i）大型藻类集合体的结构根据基质的复杂性而变化； ii）高沉积物沉积减少了以不同复杂性为特征的地层之间组合结构的变化。在沉积物的自然水平上，更大的基质复杂性增加了物种的丰富性，并促进了由建筑复杂的物种（例如大型皮质红藻）主导的集合的发展。在高沉积物沉积下，草皮成为大型藻类组合的主要组成部分，尽管不同的丝状形态对基质复杂性的反应不同。此外，高沉积物沉积物在低复杂度地层上增加了侵入性绿藻，Caulerpa cylindracea的丰度，但在高复杂度地层上则降低了其含量。这些结果表明，沉积物沉积的增加可以抑制以复杂程度不同为特征的与基底相关的组合之间的差异，从而减少α（即物种损失）和β多样性（即减少群落结构的小规模变异）。 （C）2015 Elsevier B.V.保留所有权利。

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