Benthic macroinfaunal communities of the pockmark fields in the south-eastern Bay of Biscay

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2023-12-09 DOI:10.1016/j.csr.2023.105162

Joxe Mikel Garmendia , Iñigo Muxika , José Germán Rodríguez , Beatriz Arrese , Irene Díez-García , María Gómez-Ballesteros , Francisco Sánchez , Ángel Borja , Ibon Galparsoro

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Abstract

Pockmarks are concave depressions on the sea bottom produced by fluid escape from subaqueous sediments which can be found worldwide in muddy and silt/clay sediments. Due to their morphological and geochemical characteristics, certain pockmarks play an important role in structuring benthic communities, and consequently, they have been proposed to be protected. The present research provides a characterisation of the benthic macrofauna composition in pockmark fields in the southeaster Bay of Biscay. A total of 11 samples were acquired in and close to pockmarks covering a range of depths of 414–992 m. The survey strategy considered the acquisition of one sample inside of each of the selected pockmarks and another sample near, but out of them. Collected macrofaunal organisms were identified at lowest taxonomical level (species) when possible, structural parameters were calculated and a hierarchical cluster analysis carried out with species data. Species density, biomass, richness, diversity and evenness were found to be higher in samples collected inside pockmarks in comparison to samples obtained outside but not statistically significant. This could be explained by the inactivity of the studied pockmarks, which do not offer/generate a particular environment with unusual characteristics that limit or enhance the development of specific species/groups with special traits.

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比斯开湾东南部麻子地底栖大型底栖动物群落

麻点是海底的凹陷，由水下沉积物中的流体逸出而形成，在世界各地的泥质和淤泥/粘土沉积物中均可发现。由于其形态和地球化学特征，某些麻点在构建底栖生物群落方面发挥着重要作用，因此被建议加以保护。本研究提供了比斯开湾东南部麻子地底大型底栖生物组成的特征。在麻子区内和附近共采集了 11 个样本，深度范围为 414-992 米。调查策略是在每个选定的麻点内采集一个样本，在麻点附近但不在麻点范围内采集另一个样本。在可能的情况下，对采集到的大型底栖生物进行最低分类级别（物种）鉴定，计算结构参数，并对物种数据进行分层聚类分析。发现在麻子坑内采集的样本与在麻子坑外采集的样本相比，物种密度、生物量、丰富度、多样性和均匀度较高，但在统计学上并不显著。这可能是由于所研究的痘痕并不活跃，没有提供/产生具有特殊特征的特定环境，从而限制或促进具有特殊特征的特定物种/群体的发展。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.