Benthic foraminifera as depth estimators in the tropical carbonate shelf of northeastern Brazil

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY
Davy Barbosa Bérgamo , Josefa Nilmara Lopes Lacerda , Rilda Verônica Cardoso de Araripe , Antônio Vicente Ferreira Júnior , David Holanda de Oliveira
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Abstract

Benthic foraminifera are valuable proxies for oceanographic and environmental research due to their high degree of species-specific habitat use. The present study describes the distribution of benthic foraminifera across the continental carbonate shelf of northeastern Brazil, and relates their distribution patterns to environmental parameters associated with the texture of the sediment and the depth of the water. Sediment samples were collected at depths between 0.5 and 57 m. In the laboratory, the samples were analyzed following the standard protocol established for Quaternary foraminifera research. Sediments dominated by carbonate sand, which were approximately symmetric in the first depth interval (0.5–20 m), and asymmetric in the second (20–40 m) and third (40–57 m) intervals. The foraminiferal assemblages composed of 96 species, although they were dominated by the five species – Archaias angulatus, Textularia agglutinans, Amphistegina lessonii, Quinqueloculina lamarckiana, and Peneroplis carinatus. Most tests were intact and the species composition varied across the continental shelf, with Pseudotriloculina laevigata and Globobulimina? sp. Only occurring from 0.5 to 20 m depth in shelf, while Pyrgo elongata, Quinqueloculina sp. A, Quinqueloculina sp. C, Fissurina sp. A, Fissurina sp. B, Elphidium morenoi, Glabratella brasilensis, and Siphogenerina sp. Were restricted from 20 to 40 m, and Sigmoilina sp., Fursenkoina sp., and Textularia sp. A was only recorded in depth >40 m. The diversity of the foraminiferal assemblages is favored by the attenuation of hydrodynamic conditions at deeper intervals (20–57 m). Therefore, it can be concluded that the benthic foraminiferal species respond to the depth and variation in sediment characteristics through changes in their population and assemblage structures.

Abstract Image

底栖有孔虫作为巴西东北部热带碳酸盐大陆架的深度估算器
底栖有孔虫是海洋学和环境研究的宝贵代用指标,因为它们对特定物种栖息地的利用程度很高。本研究描述了巴西东北部碳酸盐大陆架底栖有孔虫的分布情况,并将其分布模式与沉积物质地和水深相关的环境参数联系起来。沉积物样本采集深度在 0.5 米至 57 米之间。沉积物以碳酸盐砂为主,在第一个深度区间(0.5-20 米)大致对称,在第二个深度区间(20-40 米)和第三个深度区间(40-57 米)不对称。有孔虫有 96 个种类,但以 Archaias angulatus、Textularia agglutinans、Amphistegina lessonii、Quinqueloculina lamarckiana 和 Peneroplis carinatus 五种为主。大多数测试结果完好无损,大陆架上的物种组成各不相同,Pseudotriloculina laevigata 和 Globobulimina? sp. 仅出现在大陆架 0.5 至 20 米深处,而 Pyrgo elongata、Quinqueloculina sp.A、Quinqueloculina sp.C、Fissurina sp.A、Fissurina sp.B、Elphidium morenoi、Glabratella brasilensis 和 Siphogenerina sp.仅限于 20 至 40 米水深,Sigmoilina sp、有孔虫群的多样性得益于深层(20-57 米)水动力条件的衰减。因此,可以得出结论,底栖有孔虫物种通过其种群和组合结构的变化对深度和沉积物特征的变化做出反应。
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来源期刊
Continental Shelf Research
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.
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