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Sediment segregation by biodiffusing bivalves

机译：生物扩散双壳类动物对沉积物的隔离

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摘要

The selective processing of sediment fractions (sand and mud; >63 μm and ≤63 μm median grain size) by macrofauna was assessed using two size classes of inert, UV-fluorescent sediment fraction tracers (luminophores). The luminophores were applied to the sediment surface in 16 m~2 replicated plots, defaunated and control, and left to be reworked by infauna for 32 days. As the macrofaunal assemblage in the ambient sediment and the control plots was dominated by the common cockle Cerastoderma edule, this species was used in an additional mesocosm experiment. The diversity, abundance and biomass of the defaunated macrobenthic assemblage did not return to control values within the experimental period. Both erosion threshold and bed elevation increased in the defaunated plots as a response to the absence of macrofauna and an increase in microphytobenthos growth. In the absence of macrobenthos, we observed an accretion of 7 mm sediment, containing ca. 60% mud. Image analysis of the vertical distribution of the different luminophore size classes showed that the cockles preferentially mobilised fine material from the sediment, thereby rendering it less muddy and effectively increasing the sand:-mud ratio. Luminophore profiles and budgets of the mesocosm experiment under "no waves-no current" conditions support the field data very well.
机译：使用两种尺寸的惰性紫外线荧光沉积物分数示踪剂（发光体）评估了大型动物对沉积物分数（沙和泥；中值粒径> 63μm和≤63μm）的选择性处理。将发光体以16 m〜2个重复的样点施加到沉积物表面上，进行消光和控制，并留给动物染整32天。由于周围沉积物中的大型动物组合和对照样地均由常见的鸟蛤角皮病小白菜占主导地位，因此将该物种用于其他的介观实验。被破坏的大型底栖动物的多样性，丰度和生物量在实验期内没有恢复到控制值。在消失的土地上，侵蚀阈值和河床高度均增加，这是对缺乏大型动物和微底栖鱼类生长的反应。在没有大型底栖动物的情况下，我们观察到了约7 mm的沉积物积聚。 60％的泥浆。对不同发光体尺寸类别的垂直分布进行的图像分析表明，海蛤优先从沉积物中动员细颗粒物质，从而使其泥泞程度降低，并有效提高了沙泥比。 “无波无电流”条件下的中观实验的发光体轮廓和预算很好地支持了现场数据。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第4期|379-391|共13页
  • 作者

    F. Montserrat; C. Van Colen; P. Provoost; M. Milla; M. Ponti; K. Van den Meersche; T. Ysebaert; P.M.J. Herman;

  • 作者单位

    Delft University of Technology, Faculty of Civil engineering and Ceosciences, Hydraulics Section, P.O. Box 5048, 2600 GA Delft, The Netherlands Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands;

    Ghent University, Marine Biology Department, Krijgslaan 281 - S8, B-9000, Ghent, Belgium;

    Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands;

    Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands;

    Centro Interdipartimentale di Ricerca per le Scienze Ambientali in Ravenna (CIRSA), University of Bologna, Via S. Alberto 163, 48100 Ravenna, Italy;

    Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands Ghent University, Marine Biology Department, Krijgslaan 281 - S8, B-9000, Ghent, Belgium;

    Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands Wageningen IMARES, P.O. Box 77, 4400 AB Yerseke, The Netherlands;

    Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Korringaweg 7, 4401 NT, Yerseke, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    intertidal; cohesive; sediment; sand; mud; erosion; deposition; luminophores; image analysis; bioturbation; ecosystem engineering;

    机译：潮间带凝聚力沉淀;砂;泥;侵蚀;沉积发光体图像分析;生物扰动生态工程;

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