Macrobenthic recovery from hypoxia in an estuarine tidal mudflat
Macrobenthic recovery from hypoxia in an estuarine tidal mudflat
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河口潮汐滩涂大型底栖动物从缺氧中恢复
DOI：
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发表时间：
2008
期刊：
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通讯作者：
S. Degraer
中科院分区：
文献类型：
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作者：
C. Colen;F. Montserrat;M. Vincx;P. Herman;T. Ysebaert;S. Degraer
在一个多盐的河口泥滩上，研究了实验诱导的缺氧导致的完全退化后的大型底栖生物再定殖模式。通过对16 m2对照和退化样地的生物和环境变量的同步采样，在6个月的高分辨率时间内，阐明了与大型底栖动物重组相关的生态相互作用。定植主要由幼鱼的招募决定，确定了3个演替阶段，每个阶段都以不同的物种组合和环境特征为特征。在恢复过程中，功能类群的优势发生了转变，从流动地表沉积物取食者到管栖地表沉积物取食者再到生物不稳定类群，而在整个实验过程中，它们的比例优势在对照区保持相当稳定。后期殖民者的物种定殖模式揭示了与早期殖民的机会性造管多毛类（Pygospio elegans）的积极相互作用，而后来的演替物种（Het- eromastus filiformis, Macoma balthica）对动物体内造管创造的稳定有利条件产生了不利影响。不同演替阶段之间的过渡与物种的补充、环境特征的变化（沉积物的氧化状态）、直接和间接的生态相互作用（生物（de）稳定、对食物的开发竞争）有关。总的来说，我们的研究表明，缺氧后的大型底栖生物重组与不同类型的相互作用有关，所有相互作用都以独特的方式起作用。因此，大型底栖动物在潮滩栖息地的演替动态应被视为一个动态过程，与资源可用性、自然时间变化、生活史特征（如机会主义行为）和定殖物种的生物工程能力有关。
Macrobenthic recolonisation patterns after complete defaunation resulting from exper- imentally induced hypoxia were investigated in a polyhaline, estuarine mudflat. Based on simultane- ous sampling of biotic and environmental variables in replicated 16 m 2 control and defaunated plots, with a high resolution in time during 6 mo, the ecological interactions related to the macrobenthos reassembly were elucidated. Colonisation was predominantly determined by juvenile recruitment, and 3 successional stages were identified, each characterised by different species assemblages and environmental characteristics. During recovery, a shift in functional group dominance from mobile surface deposit feeders to tube-dwelling surface deposit feeders to biodestabilising taxa occurred, while their proportional dominance remained quite stable in the control plots throughout the experi- ment. Species colonisation patterns of later colonists revealed positive interactions with early colonis- ing opportunistic tube-building polychaetes Pygospio elegans, while later successional species (Het- eromastus filiformis, Macoma balthica) adversely affected the stable, favourable conditions created by the tube-building infauna. Transitions between different successional stages were related to recruitment of species, changes in environmental characteristics (oxygenation state of the sediment), direct and indirect ecological interactions (bio(de)stabilisation, exploitation competition for food). In general, our study suggests that macrobenthic reassembly after hypoxia is related to different types of interactions, all acting in a unique manner. Hence, macrobenthic successional dynamics in a tidal mudflat habitat should be considered as a dynamic process, related to resource availability, natural temporal variation, life history traits (e.g. opportunistic behaviour) and bio-engineering capacities of the colonising species.