Tidal influence on the diel vertical migration pattern of zooplankton in a tropical monsoonal Estuary

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dc.contributor.author Vineetha, G.
dc.contributor.author Jyothibabu, R.
dc.contributor.author Madhu, N.V.
dc.contributor.author Kusum, K.K.
dc.contributor.author Sooria, P.M.
dc.contributor.author Shivaprasad, A.
dc.contributor.author Reny, P.D.
dc.contributor.author Deepak, M.P.
dc.date.accessioned 2015-08-26T04:26:42Z
dc.date.available 2015-08-26T04:26:42Z
dc.date.issued 2015
dc.identifier.citation Wetlands, vol.356(3); 2015; 597-610
dc.identifier.uri http://drs.nio.org/drs/handle/2264/4775
dc.description.abstract Monsoonal estuaries, located along the coastline of the Indian subcontinent, differ from other estuaries by their time dependence on the salinity characteristics. Effective sustenance and retention of the mesozooplankton community in the estuarine habitats is often determined by their dominant behavioral patterns: diel vertical migration (DVM) and tidal vertical migration (TVM). The modes of these endogenous rhythms often vary among estuaries based on the river runoff and tidal characteristics. The present study is a pioneering attempt to depict the vertical migration pattern of zooplankton along a diel and tidal scale in a tropical, microtidal, monsoonal estuary. We observed that in spite of the prominent asymmetry in the magnitude of the river runoff between the seasons, most of the zooplankton groups exhibited strong DVM, with a clear increase in biomass and abundance in surface waters during night. The peak increase in biomass and abundance at night always synchronized with the slack periods in the tidal cycles, which differed from the general concepts of downward migration during ebb tide and upward migration during flood tide in estuarine systems. The weak currents during the slack period might have favored the effective vertical migration of the mesozooplankton community in this monsoonal estuarine system.
dc.language.iso en
dc.publisher Springer
dc.rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2015] Springer.
dc.subject AQUATIC COMMUNITIES::Zooplankton
dc.subject POPULATION STUDIES::Migrations and rhythms
dc.subject OCEANOGRAPHY AND LIMNOLOGY::Nearshore dynamics
dc.subject OCEANOGRAPHY AND LIMNOLOGY::Tides, surges and sea level
dc.title Tidal influence on the diel vertical migration pattern of zooplankton in a tropical monsoonal Estuary
dc.type Journal Article

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