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Recent Ostracoda from the shelf sediments of southwestern part of Bay of Bengal: implication on microenvironments
Priyanka, T.S.A.; Anbuselvan, N.; Senthil, N.; Hussain, S.M. (2021). Recent Ostracoda from the shelf sediments of southwestern part of Bay of Bengal: implication on microenvironments. Thalassas 37(1): 65-79. https://dx.doi.org/10.1007/s41208-020-00275-z
In: Thalassas. Universidad de Vigo: Vigo. ISSN 0212-5919; e-ISSN 2366-1674
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| Trefwoorden |
Ostracoda [WoRMS]
Marien/Kust |
| Author keywords |
Recent Ostracod, Shelf sediments, South-Western part of bay of Bengal, Microenvironments |
| Auteurs | | Top |
- Priyanka, T.S.A.
- Anbuselvan, N.
- Senthil, N.
- Hussain, S.M.
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| Abstract |
A detailed study on Recent Ostracoda was carried out in twenty-six surface sediment samples collected from shelf region of the Southwestern part of Bay of Bengal. A total of 21 species of Ostracoda belonging to 18 genera have been identified, of which, seven species are abundant (>5%). The Q-mode and R-mode cluster analyses of the abundant species resulted in two assemblage defining different microenvironments. The shallowest assemblage (I) from 10 to 80 m water depth is characterised by Hemikrithe Orientalis, Pterygocythereis chennaiensis and Lankacythere multifora which are associated with sand to slightly muddy sand. The second assemblage (II) from 80 to 200 m water depth is associated by Keijella reticulata, Bairdoppilata paraalcyonicola, Actinocythereis scutigera and Stigmatocythere indica and the nature of sediments varies from slightly muddy sand to slightly sandy mud. The sediments from 50-100 m water depth are foundto contain higher concentration of organic matter (TOC and TN) suggesting the high productivity zone. The C/N ratio value ranges from 4 to 8 in 52% of sediment samples indicating both marine and terrestrial source. The shallower part of the seafloor up to 30 m depth is dominated by sandysediments, reflecting the occurence of high-energy conditions. The higher mud content in the deeper part is due to the prevalance of low energy condition. The carapace-valve ratio (1:9) indicates that the study area experiencing a slower rate of sedimentation. Our study results revealed that the distribution of Ostracoda in the Southwestern part of Bay of Bengal is controlled by the type of sediment, depth and physicochemical parameters of the bottom water. |
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