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Field and Laboratory Observations on Predation and Prey Selectivity of the Scyphomedusa Chrysaora *** in Southeast Indian Waters

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Journal of Ocean University of China 2011年第1期10卷 47-54页

作者： Govindan Kanagaraj Pazhaniyappan Ezhilarasan pitchai sampathkumar André C.Morandini Velayudhan pillai Sivakumar Southeastern Institute of Marine Biology Thomas Nagar Department of Zoology V.O.Chidambaram College Centre of Advanced Study in Marine Biology Departamento de Zoologia Instituto de BiociênciasUniversidade de So Paulo

Chrysaora ***,one of the most abundant medusae species in India,seems to be an important predator in the coastal waters of Bay of *** ability of Chrysaora *** to feed at maximum rate in high prey concentrations implies that this jellyfish can efficiently exploit dense prey patches,at least for a short *** study presents preliminary information regarding digestion and feeding rate upon copepods in a warm water *** ingestion rate of the average-sized medusae Chrysaora *** is well balanced in nature,which in turn implies that this jellyfish is tuned for optimal utilization of available prey *** with earlier research indicates that prey escape speed is one important factor governing which prey will be captured.A full understanding of predation mechanics awaits further investigation of both predator and prey ***,because of the scarcity of long-term quantitative population data most insights have to be made ***,low abun-dance of Chrysaora *** in the water column during summer (May 2007) and the overall annual abundance seem not to con-siderably affect the zooplankton population,especially *** present work contributes to the knowledge of prey-predator relationship of the forgotten fauna in Indian waters,which is especially crucial for understanding the process of ecological recovery of coastal water environment.

关键词： predation prey selectivity jellyfish Bay of Bengal copepods

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Hydrographical parameters and phytoplankton assemblages along the Pondicherry—Nagapattinam coastal waters,southeast coast of India

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Advances in Climate Change Research 2015年第1期6卷 36-45页

作者： pitchai sampathkumar Srinivasan BALAKRISHNAN Krishnamoorthy KAMALAKANNAN Rethinavelu SANKAR Lakshmanan RAMKUMAR Subramani RAMESH Neelamegam KABILAN Thambusamy SURESHKUMAR Chellam THENMOZHI Mookapillai GOPINATH Sekar JAYASUDHA Amalanathan AROKIYASUNDRAM Thiruvarasan LENIN Thangavelu BALASUBRAMANIAN Centre of Advanced Study in Marine Biology Faculty of Marine Sciences Annamalai University

Hydrographical parameters and phytoplankton assemblages were determined along the Pondicherry, Parangipettai and Nagapattinam coastal waters, southeast coast of India. All the hydrographical parameters such as sea surface temperature, salinity, p H, total alkalinity, dissolved oxygen and nutrients like nitrate, nitrite, inorganic phosphate and reactive silicate, chlorophyll a and phytoplankton assemblages were studied for a period of five months(May, August, September 2010, March and November 2011). Over 121 species of phytoplankton represented by 93 species of diatoms, 16 species of dinoflagellates, 9 species of blue-green algae, 2 species of greens and 1 species of silicoflagellate were recorded. High phytoplankton species diversity was found in March 2011 when salinity and nitrate concentrations were low and reactive silicate and inorganic phosphates were moderate. Species diversity was low during May 2010 when increased sea surface temperature, salinity and low nutrients availability were observed. Coscinodiscus centralis, Diatoma vulgaris and Proboscia alata were dominant, especially Coscinodiscus sp. distributed in all stations whereas Skeletonema costatum, Odontella sinensis and Ditylum brightwellii were abundant in August and September 2010. From principal component analysis and multiple regression analysis, it is evident that variables like sea surface temperature and dissolved oxygen are the most important factors influencing the seasonal pattern of phytoplankton population.

关键词： Hydrographical parameters Phytoplankton Southeast coast Bay of Bengal Seasonal variations

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