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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Invertebrate dispersal and habitat heterogeneity: Expression of biological traits in a seagrass landscape
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Invertebrate dispersal and habitat heterogeneity: Expression of biological traits in a seagrass landscape

机译：无脊椎动物的扩散和生境异质性：海草景观中生物特征的表达

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Seagrass meadows harbour diverse faunal assemblages, but the relative importance of landscapes attributes, settlement processes and biological traits of individual species for recruitment patterns is poorly understood. To quantify the influence of habitat heterogeneity on larval, juvenile and adult post-larval dispersal, invertebrates (>125 μm) were collected in benthic settlement traps at five occasions (June-August) in three habitats; continuous seagrass, seagrass patches and bare sand. The study was carried out by SCUBA diving in a subtidal (2.5 m depth) seagrass landscape dominated by Zostera marina L. in the Baltic Sea. Traps collected totally >30 taxa, with non-significant effects of habitat on species richness and total abundance. Total number of invertebrates exhibited strong temporal variability, probably driven by wind-induced bedload and water column transport. Surprisingly, traps located in small (<12 m~2) patches contained on average almost twice as many individuals as traps located in the continuous vegetation. Dominating taxa such as nematodes, copepods, and oligochaetes were found in similar densities across the landscape, in contrast, location within the landscape had strong effects on bivalve settlement and redistribution patterns, resulting in significantly lower densities in continuous vegetation compared to patches and bare sand. A biological trait analysis indicated that semi-mobile taxa with annual protracted direct development, and short-distance dispersal are probably of higher importance for the community assembly process in this environment than long-distance larval dispersal. Results suggest that seagrass landscapes are highly dynamic environments, characterized by time and species-specific effects of landscape attributes on animal dispersal and recruitment. A conceptual model illustrating interactions between settling larvae and landscape heterogeneity is presented.
机译：海草草地上有各种各样的动物群落，但人们对景观特征，定居过程和单个物种的生物学特性对于募集模式的相对重要性了解甚少。为了量化生境异质性对幼虫，幼体和成年幼虫后扩散的影响，在三个生境中五次（6月至8月）在底栖生物沉积陷阱中收集了无脊椎动物（> 125μm）。连续的海草，海草斑块和裸露的沙子。这项研究是通过SCUBA潜水在波罗的海的Zostera marina L.主导的潮下（2.5 m深度）海草景观中进行的。陷阱总共收集了> 30个分类单元，其栖息地对物种丰富度和总丰度没有显着影响。无脊椎动物的总数表现出很强的时间变化性，这可能是由风诱发的床荷和水柱运输驱动的。令人惊讶的是，位于小片（<12 m〜2）斑块中的陷阱平均包含的个体几乎是连续植被中陷阱的两倍。在整个景观中以相似的密度发现了主要的分类单元，例如线虫，co足类和寡足类，相反，景观中的位置对双壳类动物的定居和再分布模式有很大的影响，与斑块和裸露的沙地相比，连续植被的密度明显降低。一项生物学特性分析表明，在这种环境下，具有长期持续直接发展和短距离散布的半流动生物分类对于这种群落的组装过程可能比长距离幼虫散布具有更高的重要性。结果表明，海草景观是高度动态的环境，其特征是景观属性对动物传播和募集的时间和物种特异性影响。提出了一个概念模型，说明了沉降幼虫和景观异质性之间的相互作用。

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