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Recent marine Ostracoda from East Indian shelf-slope sediments and their response to marine hydrodynamics

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Abstract

A total of 45 seafloor sediments procured from shelf-slope region off Chennai–Cuddalore in the Bay of Bengal and analyzed for ostracod population revealed the presence of 41 species in 30 genera. Based on the results, the dominant species include Cushmanidea spp., Actinocythereis scutigera, Caudites javanus, Neomonoceratina iniqua, Spinoceratina spinosa, Stigmatocythere spp., Tanella gracilis and Lankacythere spp. Shapes, sizes and sculpture of ostracod carapaces/valves reflect the textural characteristics of substrates displaying their preference of habitats along with other ecological factors such as temperature, salinity, pH and dissolved oxygen content which seem to positively influence the abundance of diverse ostracod population at various depths.

Research highlights

  1. 1.

    The study conducted in this region for the first time revealed the presence of 41 species.

  2. 2.

    The ostracod population is dominantly benthic preferring sandy sediment substrates.

  3. 3.

    Ornamentation of ostracod valves is influenced by the energy conditions prevailing in the shelf-slope region.

  4. 4.

    Overall, environmental factors play a role in the spatial distribution of ostracods.

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Acknowledgements

The authors thank the University Grants Commission, New Delhi for the financial support during research work, and the National Institute of Ocean Technology, Chennai (Ministry of Earth Sciences, Government of India) for sample collection. We also thank Mr D Rajashekar (Vessel Management Cell Head), crew members and scientists who accompanied us onboard. We are grateful to the SEM facility at Pondicherry University.

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The corresponding author has participated in sample collection and analyses, while writing, or revision of the manuscript was carried out along with the second author.

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Correspondence to K Tabita Symphonia.

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Communicated by Pratul K Saraswati

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Tabita Symphonia, K., Senthil Nathan, D. Recent marine Ostracoda from East Indian shelf-slope sediments and their response to marine hydrodynamics. J Earth Syst Sci 130, 195 (2021). https://doi.org/10.1007/s12040-021-01685-0

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  • DOI: https://doi.org/10.1007/s12040-021-01685-0

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