DOI: 10.1016/j.palaeo.2017.05.004
论文题名: Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India
作者: Mohammed Nishath N. ; Hussain S.M. ; Neelavnnan K. ; Thejasino S. ; Saalim S. ; Rajkumar A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 483 起始页码: 70
结束页码: 82
语种: 英语
英文关键词: Bathymetry
; Biodiversity
; Ostracoda
; Shelf to slope and Bay of Bengal
英文摘要: Thirty seven surface sediment samples collected through a multi-corer in seven transects of ORV Sagar Kanya, SK 308 Leg-1 from off central Bay of Bengal (shelf to slope environment) were analysed for living and dead Ostracoda. The samples, which ranged in water depth from ~ 29 m to 2540 m, yielded a total of 46 species belonging to 32 genera. The ostracod fauna of the Bay of Bengal exhibit a depth-related distribution that is controlled by substrate and hydrographic conditions. Sandy substrates of shallow water depth (~ 28 m) are characterized by Propontocypris sp. and Cytherelloidea malaccaensis. These species are replaced by Neonesidea cracenticlavula and Bairdoppilata paraalcyonicola in high population, which shows positive linear correlation with salinity, temperature and Total Calcium Carbonate (TCC) in the outer shelf ~ 55–73 m. Paijenborchella sp. dominates at ~ 763 m in the bathypelagic zone, giving way to Parakrithella sp. at greater depths of ~ 2540 m on soft-bottom substrates. The fauna represents an interesting mixture of displaced species and others known from bathyal and abyssal depths in the Bay of Bengal, including some pandemic deep sea species. The ostracod faunal diversity is higher in shallower water than in the deeper water, which may be due to the optimum temperature, pH, salinity and substrate. The fauna are comprised of three associations (Shelf/Upper Slope; Slope; Lower Slope/Abyss). A marked faunal turnover occurs at the outer-shelf. Factor Analysis was performed to determine the correlation of water and sediment parameters with the ostracod species. This study provides a detailed account of bathymetry and ostracod biodiversity recorded in the study area. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67778
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai, India; Micropaleontology Lab, Geological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa, India
Recommended Citation:
Mohammed Nishath N.,Hussain S.M.,Neelavnnan K.,et al. Ostracod biodiversity from shelf to slope oceanic conditions, off central Bay of Bengal, India[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,483