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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Role of macrofauna on benthic oxygen consumption in sandy sediments of a high-energy tidal beach
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Role of macrofauna on benthic oxygen consumption in sandy sediments of a high-energy tidal beach

机译：大型动物对高能潮汐沙滩含沙沉积物中底栖耗氧的作用

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Sandy beaches exposed to tide and waves are characterized by low abundance and diversity of benthic macrofauna, because of high-energy conditions. This is the reason why there are few studies on benthic communities living in such highly dynamic environments. It has been shown recently that tidal sandy beaches may act as biogeochemical reactors. Marine organic matter that is supplied in the sand during each flood tide is efficiently mineralized through aerobic respiration. In order to quantify the role of macrofauna in the whole beach benthic respiration, we studied the macrofauna and the pore water oxygen content of an exposed sandy beach (Truc Vert, SW of France) during four seasons in 2011. The results showed that macrofauna was characterised by a low number of species of specialized organisms such as the crustaceans Eurydice naylori and Gastrosaccus spp. and the polychaetes Ophelia bicornis and Scolelepis squamata. The distribution and abundance of macrofauna were clearly affected by exposure degree and emersion time. The combined monitoring of benthic macrofauna and pore waters chemistry allowed us to estimate (1) the macrofauna oxygen uptake, calculated with a standard allometric relationship using biomass data, and (2) the total benthic oxygen uptake, calculated from the oxygen deficit measured in pore waters. This revealed that benthic macrofauna respiration represented a variable but low (< 10%) contribution to the total benthic oxygen consumption. This suggests that oxygen was mainly consumed by microbial respiration. (C) 2016 Elsevier Ltd. All rights reserved.
机译：由于高能条件，暴露于潮汐和波浪的沙滩的特征是底栖大型动物群的丰度低和多样性。这就是为什么很少有人研究生活在这种高度动态环境中的底栖生物群落的原因。最近显示，潮汐沙滩可作为生物地球化学反应器。每次潮汐期间在沙子中供应的海洋有机物通过有氧呼吸被有效矿化。为了量化大型动物在整个海滩底栖呼吸中的作用，我们研究了2011年四个季节裸露的沙滩（法国西南部的Truc Vert）的大型动物和孔隙水中的氧含量。其特点是特种生物种类少，例如甲壳类Eurydice naylori和Gastrosaccus spp。和多毛cha Ophelia bicornis和Scolelepis squamata。大型动物的分布和丰度明显受到暴露程度和出苗时间的影响。底栖大型动物和孔隙水化学物质的联合监测使我们能够估计（1）利用生物量数据通过标准异速关系计算的大型动物氧气摄入量，以及（2）根据孔隙中测得的缺氧量计算的底栖动物总氧气摄入量水域。这表明底栖大型动物的呼吸作用代表了底栖氧气总消耗量的可变但低（<10％）贡献。这表明氧气主要通过微生物呼吸消耗。 （C）2016 Elsevier Ltd.保留所有权利。

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