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首页> 外文期刊>Estuarine Coastal and Shelf Science >Distribution, vertical position and ecological implications of shallow gas in Bahia Blanca estuary (Argentina)
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Distribution, vertical position and ecological implications of shallow gas in Bahia Blanca estuary (Argentina)

机译：巴伊亚布兰卡河口（阿根廷）浅层气体的分布，垂直位置及其生态意义

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There has been a growing interest in the study of shallow gas due its importance in relation to the marine environment, climate change and human activities. In Bahia Blanca estuary, Argentina, shallow gas has a wide distribution. Acoustic turbidity and blanking are the main seismic evidence for the presence of shallow gas in the estuary. The former prevails in the inner sector of the estuary where gas is either near or in contact with the seabed. Gas deposits are generally associated with paleochannels corresponding to the Holocene paleodeltaic environment. Distribution studies of shallow gas in this estuary are necessary because its presence implies not only a geological risk for harbor activities but also because it may have noxious effects on the marine ecosystem, mainly on benthic communities. The comparison of benthic communities at a gas site (GS) with those at a control site (CS) indicated that gas could generate impoverishment in terms of individuals' abundance (GS: N = 357; CS: N = 724). Also, diversity indices showed great differences in the community structure at each site. This indicates that methane gas may act as a natural disturbance agent in estuarine ecosystems. The presence of gas in seabed sediments must therefore be taken into account when distribution studies are conducted of estuarine benthic communities. (C) 2018 Elsevier Ltd. All rights reserved.
机译：由于浅层气体在海洋环境，气候变化和人类活动方面的重要性，因此人们对浅层气体的研究兴趣日益浓厚。在阿根廷的巴伊亚布兰卡河口，浅层气体分布广泛。声混浊和消隐是河口浅层气体存在的主要地震证据。前者主要存在于河口的内部区域，那里的气体靠近海床或与海床接触。气体沉积通常与对应于全新世古deltadelic环境的古河道有关。在此河口进行浅层气体的分布研究是必要的，因为它的存在不仅暗示着港口活动的地质风险，还因为它可能对海洋生态系统（主要是底栖生物群落）产生有害影响。天然气站点（GS）和控制站点（CS）的底栖生物群落的比较表明，就个人的丰度而言，天然气可能产生贫困（GS：N = 357； CS：N = 724）。此外，多样性指数显示每个站点的社区结构差异很大。这表明甲烷气体可能在河口生态系统中充当自然干扰剂。因此，在对河口底栖生物进行分布研究时，必须考虑到海底沉积物中的气体存在。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2018年第5期|222-231|共10页
  • 作者

    Bravo M. E.; Aliotta S.; Fiori S.; Ginsberg S.;

  • 作者单位

    Consejo Nacl Invest Cient & Tecn, Inst Argentino Oceanog, La Carrindanga Km 7, RA-8000 Bahia Blanca, Buenos Aires, Argentina;

    Consejo Nacl Invest Cient & Tecn, Inst Argentino Oceanog, La Carrindanga Km 7, RA-8000 Bahia Blanca, Buenos Aires, Argentina;

    Consejo Nacl Invest Cient & Tecn, Inst Argentino Oceanog, La Carrindanga Km 7, RA-8000 Bahia Blanca, Buenos Aires, Argentina;

    Consejo Nacl Invest Cient & Tecn, Inst Argentino Oceanog, La Carrindanga Km 7, RA-8000 Bahia Blanca, Buenos Aires, Argentina;

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