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首页> 外文期刊>Estuarine Coastal and Shelf Science >Hydrodynamic conditioning of diversity and functional traits in subtidal estuarine macrozoobenthic communities
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Hydrodynamic conditioning of diversity and functional traits in subtidal estuarine macrozoobenthic communities

机译：潮下河口大型兽类群落多样性和功能性状的水动力条件

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摘要

Variations in abundance and diversity of estuarine benthic macrofauna are typically described along the salinity gradient. The influence of gradients in water depth, hydrodynamic energy and sediment properties are less well known. We studied how these variables influence the distribution of subtidal macrofauna in the polyhaline zone of a temperate estuary (Westerschelde, SW Netherlands). Macrofauna density, biomass and species richness, combined in a so-called ecological richness, decreased with current velocities and median grain-size and increased with organic carbon of the sediment, in total explaining 39% of the variation. The macrofauna community composition was less well explained by the three environmental variables (approx. 12-15% in total, with current velocity explaining approx. 8%). Salinity, water depth and distance to the intertidal zone had a very limited effect on both ecological richness and the macrofauna community. The proportion of (surface) deposit feeders (including opportunistic species), decreased relative to that of omnivores and carnivores with increasing current velocity and sediment grain-size. In parallel, the proportion of burrowing sessile benthic species decreased relative to that of mobile benthic species that are able to swim. Correspondingly, spatial variations in hydrodynamics yielded distinct hotspots and coldspots in ecological richness. The findings highlight the importance of local hydrodynamic conditions for estuarine restoration and conservation. The study provides a tool based on a hydrodynamic model to assess and predict ecological richness in estuaries. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通常沿盐度梯度描述河口底栖大型动物的丰度和多样性变化。人们对水深，水动力能量和沉积物特性的梯度的影响鲜为人知。我们研究了这些变量如何影响温带河口（Westerschelde，SW荷兰）的多卤带中潮间带大型动物的分布。大型动物的密度，生物量和物种的丰富度结合在一起，即所谓的生态丰富度，随着流速和中值粒径的降低而降低，并随着沉积物的有机碳而增加，总共解释了39％的变化。三种环境变量（总共约占12-15％，流速约占8％）不能很好地解释大型动物群落的组成。盐度，水深和到潮间带的距离对生态丰富度和大型动物群落的影响非常有限。相对于杂食动物和食肉动物，（表面）沉积物给食者（包括机会性物种）的比例随着电流速度和沉积物粒度的增加而降低。同时，相对于能够游泳的活动底栖物种而言，穴居无土底栖物种的比例下降了。相应地，水动力的空间变化在生态丰富度上产生了不同的热点和冷点。这些发现突出了当地水动力条件对河口恢复和保护的重要性。该研究提供了一种基于水动力模型的工具，可以评估和预测河口的生态丰富度。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2017年第15期|80-92|共13页
  • 作者

    van der Wal Daphne; Lambert Gwladys I.; Ysebaert Tom; Plancke Yves M. G.; Herman Peter M. J.;

  • 作者单位

    NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands;

    NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Anglesey, Wales;

    NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Wageningen Marine Res, POB 77, NL-4400 AB Yerseke, Netherlands;

    Flemish Govt, Flanders Hydraul Res, Antwerp, Belgium;

    NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|POB 177, NL-2600 MH Delft, Netherlands;

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  • 正文语种 eng
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  • 关键词

    Macrozoobenthos; Estuarine gradients; Functional traits; Hydrodynamics; Flow; Westerschelde;

    机译：大型动物;河口梯度;功能性状;水动力;流动;Westerschelde;

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