Diversity of planktonic Ostracods (Crustacea: Ostracoda) in the mixed layer of northeastern Arabian Sea during the summer monsoon

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Jasmine Purushothaman


Planktonic ostracods contribute significantly to the biomass of zooplankton in the Arabian Sea with an unusually high density due to swarming.  However, due to the small size, their abundance is often underestimated.  In this paper, the diversity of planktonic ostracods in the mixed layer depth of the northeastern Arabian Sea in relation to environmental parameters during the summer monsoon is presented.  The mean abundance in the mixed layer depth was very high.  About 26 species belonging to 17 genera representing two families were recognized.  Out of this, 25 species belonged to (3 sub families, 16 genera) the order Myodocopa and one to the order Myodocopida.  The dominant species were Cypridina dentata, Euconchoecia aculeata, Conchoecia subarcuata and Orthoconchoecia atlantica.  Cypridina dentata and Euconchoecia aculeata contributed to about 89% of the total abundance.  The results suggest that the distribution and diversity of ostracods were very much influenced by the hydrographic conditions of the Arabian Sea during the summer monsoon.


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How to Cite
Purushothaman, J. 2015. Diversity of planktonic Ostracods (Crustacea: Ostracoda) in the mixed layer of northeastern Arabian Sea during the summer monsoon. Journal of Threatened Taxa. 7, 3 (Mar. 2015), 6980–6986. DOI:https://doi.org/10.11609/JoTT.o4112.6980-6.
Author Biography

Jasmine Purushothaman, Zoological Survey of India, M Block, New Alipore, Kolkata, West Bengal 700053, India

Jasmine Purushothaman is a scientist in the Zoological Survey of India. She has been working on zooplankton and the taxonomy of marine planktonic ostracods since 2002.  She has published 10 research papers in the SCI journals and is presently working on a MoES project - Marine faunal diversity along the Odisha coast under the Indian Ocean Biogeographic Information System (IndOBIS) programme.



Angel, M.V. (1983). A review on the progress of research on halocyprid and other oceanic planktonic ostracods 1972–82, pp. 529–548. In: Maddocks, R.F. (eds.). Applications of Ostracoda. University of Houston Geoscience Department, Houston Texas.

Angel, M.V. (1993). Marine planktonic ostracods, pp. 1–239. In: Kermack, D.M., R.S.K. Barnes & J.H. Crothers (eds.). Synopsis of the British Fauna, 48, Linnean Society of London and The Estuarine and Coastal Sciences Association by the Field Studies Council: Shrewsbury, New Series.

Angel, M.V. (1969a). Planktonic ostracods from the Canary Island region; their depth distributions, diurnal migrations and community organisation. Journal of Marine Biological Association U.K., 44: 515–553.

Angel, M.V. (1969b). The redescription of three halocypridostracods, Conchoeciahyalophyllum Claus, C. magna Claus and C. parthenoda Müller from the North Atlantic. Crustaceana 17: 45–63.

Angel, M.V. (1999). Ostracoda, pp. 815–868. In: South Atlantic Zooplankton. Boltovskoy, D. (eds.), Backhuys Publishers, Leiden.

Angel, M.V., K. Blachowiak-Samolyk, I. Drapun & R. Castillo (2007). Changes in the composition of planktonic ostracod populations across a range of latitudes in the Northeast Atlantic. Progress in Oceanography 73: 60–78;


Castillo, R., T. Antezana & P. Ayon (2007).The influence of El Nino 1997-98 on pelagic ostracods in the Humbolt Current Ecosystem off Peru. Hydrobiologia 585: 29–41; http://dx.doi.org/10.1007/s10750-007-0626-5

Carpenter, J.H. (1965). The Chesapeake Bay Institute technique for the Winkler dissolved oxygen method. Limnology & Oceanography 10: 141–143.

Drapun, I. & S.L. Smith (2012). Halocyprid Ostracods of The Arabian Sea Region. SultanQaboos University, Academic Publication Press, 223pp.

George, J. (1968). A preliminary report on the distribution and abundance of planktonic ostracods in the Indian Ocean. Bulletin of National Institute of Oceanography India 38: 641–648.

George, J. (1979). Redescription of Archiconchoecia striata Muller (Ostracoda, Halocyprididae) and its distribution in the Northern Indian Ocean. Crustaceana 36: 123–128.

George, J. & V.R. Nair (1980). Planktonic ostracods of the northern Indian Ocean. Mahasagar - Bulletin of National Institute of Oceanography 13: 29–44.

George, J., K.S. Purushan & M. Madhupratap (1975). Distribution of planktonic ostracods along the south west coast of India. Indian Journal of Marine Science 4: 210–202.

Hopkins, T.L. (1985). Food web of an Antarctic midwater ecosystem. Marine Biology 89: 197–212; http://dx.doi.org/10.1007/BF00392890

Hopkins, T.L. & J.J. Torres (1988). The zooplankton community in the vicinity of the ice edge, Western Weddell Sea, March 1986. Polar Biology 9: 79-87; http://dx.doi.org/10.1007/BF00442033

James, M.C. (1973). On Bathyconchoecia lacunosa (Muller) a rare halocyprid from the Arabian Sea. Journal of Marine Biological Association India 15: 433–438.

James, M.C. (1972). Conchoecia indica, a new ostracod from the south west coast of India. Journal of Marine Biological Association India 14: 819–826.

Jasmine, P., K.R. Muraleedharan, T.V. Raveendran & C.T. Achuthankutty (2007). Can swarming of the ostracod Cypridina dentata be an indicator of the Arabian Sea high saline water mass, pp. 36–39. In: Proceedings of the Symposium of the Arabian Sea International Conference on Science & Technology of Aquaculture, Fisheries and Oceanography, Kuwait.

Krishnakumari, L.K. & C.T. Achuthankutty (1989). Standing stock and biochemical composition of zooplankton in the northeastern Arabian Sea. Indian Journal of Marine Sciences 18: 103–105

Kumar, S.P., M. Madhupratap, M.D. Kumar, P.M. Muraleedharan, S.N. de Souza, M. Gauns & V.V.S.S. Sarma (2001). High biological productivity in the central Arabian Sea during summer monsoon driven by Ekman pumping and lateral advection. Current Science 81: 1633–1638.

Madhupratap, M., T.C. Gopalakrishnan, P. Haridas & K.K.C. Nair (2001). Meso zooplankton biomass, composition and distribution in the Arabian Sea during the fall intermonsoon: implications of oxygen gradients. Deep Sea Research II 48: 1345–1368; http://dx.doi.org/ 10.1016/S0967-0645(00)00142-9

Madhupratap, M., P. Haridas, N. Ramaiah & C.T. Achuthankutty (1992). Zooplankton of the southwest coast of India: abundance, composition, temporal and spatial variability in 1987, pp. 99–112. In: Desai, B.N. (eds.). Oceanography of the Indian Ocean. New Delhi.

Madhupratap, M., S.R.S. Nair, P. Haridas & G. Padmavati (1990). Response of zooplankton to physical changes the environment: coastal upwelling along the central west coast of India. Journal of Coastal Research 6: 413–426.

Madhupratap, M., T.C. Gopalakrishnan, P. Haridas, K.K.C. Nair, P.N. Aravindakshan, G. Padmavati & S. Paul (1996). Lack of seasonal and geographic variation in mesozooplankton biomass in the Arabian Sea and its structure in the mixed layer. Current Science 71: 863–868.

Martens, J.M. (1979). Die pelagischen Ostracoden der Marchile I - Expedition (Südost Pazifik), 1: Verbreitung, Zoogeographie und Bedeutung als Indikatoren für Wasserkörper. (Crust. Ostracoda: Myodocopida). Studies on Neotropical Fauna and Environment 16: 57–97.

Mathew, K.J. (1980). Studies on quantitative abundance of euphausiacea (Crustacea) with special reference to distribution in space and time along the southwest coast of India. Journal of Marine Biological Association of India 22: 123–148.

Muller, G.W. (1890). UeberHalocypriden. ZoologischeJahrbücher: AbteilungfürSystematik, Geographie und Biologie der Tiere 5: 253–280.

Muller, G.W. (1906). Ostracoda. Wissenschaftliche ergebnisse der Deutschen Tiefsee-Expedition 1898–1899. 8: 29–154.

Nair, V.R. (1978). Coincident occurrence of Sagitta enflata (Chaetognatha) & Cypridina dentata (Crustacea: Ostracoda: Cypridinidae) off Maharashtra Coast. Indian Journal of Marine Science 7(4): 304–306.

Nair, V.R. & M. Madhupratap (1984). Latitudinal range of epiplanktonic Chaetognatha and Ostracoda in the western tropical Indian Ocean. Hydrobiologia 112: 209–216.

Nielsen, E.S. (1952). The use of radioactive carbon (14C) for measuring organic production in the sea. Journal du Conseil., 18: 117–140.

Padmavathi, G., P. Haridas, K.K.C. Nair, T.C. Gopalakrishnan, S. Paul & M. Madhupratap (1998).Vertical distribution of zooplankton in the central and eastern Arabian Sea during the winter monsoon. Journal of Plankton Research 20(2): 343–354; http://dx.doi.org/10.1093/plankt/20.2.343

Panikkar, N.K. (1968). Maps on total zooplankton biomass in the Arabian Sea and Bay of Bengal, pp. 16–19. In: Plankton Atlas.International Indian Ocean Expedition (eds.). New Delhi.

Poulsen, E.M. (1969). Ostracoda-Myodocopa from the eastern tropical Atlantic. Videnskabelige Meddelelserfra Dansk Naturhistorisk Forening 132: 129–197.

Poulsen, E.M. (1973). Ostracoda-Myodocopa. 3b. Halocypriformes-Halocypridae. Conchoecinae. Dana Report, No. 84, 223pp.

Paulinose, V.T. & P.N. Aravindakshan (1977). Zooplankton biomass abundance and distribution in the north and northwestern Indian Ocean, pp. 132–136. In: Proceedings of the Symposium of Warm Water Zooplankton, NIO, Goa, India.

Qasim, S.Z. (1982). Oceanography of the northern Arabian Sea. Deep Sea Research 29: 1041–1068; http://dx.doi.org/10.1016/0198-0149(82)90027-9

Strickland, J.D.H. & T.R. Parsons (1972). A practical handbook of sea water analysis. Bulletin of Fisheries (Research Board, Canada) 167: 310pp.

Vannier, J., K. Abe & K. Ikuta (1998). Feeding in mydocopidostracods: functional morphology and laboratory observations from videos. Marine Biology 132: 391–408; http://dx.doi.org/10.1007/s002270050406