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dc.contributor.authorKusum, K.K.
dc.contributor.authorVineetha, G.
dc.contributor.authorRaveendran, T.V.
dc.contributor.authorMuraleedharan, K.R.
dc.contributor.authorNair, M.
dc.contributor.authorAchuthankutty, C.T.
dc.date.accessioned2011-12-08T07:35:52Z
dc.date.available2011-12-08T07:35:52Z
dc.date.issued2011
dc.identifier.citationDeep-Sea Research I, vol.58; 2011; 1163-1174
dc.identifier.otherno
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3961
dc.description.abstractThe influence of a thick layer of oxygen-depleted water (<0.2 ml l sup(-1)) on the abundance and distribution of chaetognaths was investigated in the northeastern Arabian Sea (NEAS), a natural oxygen-deficient system in the global ocean. The species and maturity stage-wise distribution of this group were studied at five discrete depths down to 1000 m. A total of 22 species belonging to four genera were observed, and the genus Sagitta dominated, representing 60% (500-1000 m) to 89% (Mixed layer depth) of the total chaetognath population. Based on their vertical distribution limits, four groups were recognised, as follows: I: species abundant in surface water with a maximum distribution limit up to 300 m; II: species confined mainly to deeper waters (>500 m); III: species present throughout the water column (0–1000 m); and IV: species present in most layers, but with a preference for a specific depth stratum. A positive correlation (P<0.01) was observed in the abundance of chaetognaths and their main prey copepods, emphasising the strong trophic relationship between these groups. It was found that the intensely oxygen-deficient waters of the NEAS play a crucial role in the vertical distribution and abundance of chaetognath species of all four genera. This report presents information on the maturity stages and ontogenetic migration of this important planktonic group in relation to the oxygen-depleted water in the study region for the first time. The results obtained are also important for understanding the biological processes associated with a major oxygen minimum zone (OMZ) in the global ocean.
dc.language.isoen
dc.publisherElsevier
dc.relation.requiresDeep-Sea_Res_I_58_1163.jpg
dc.rightsAn edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
dc.subjectzooplankton
dc.subjectvertical distribution
dc.subjectspecies diversity
dc.titleImpact of oxygen-depleted water on the vertical distribution of chaetognaths in the northeastern Arabian Sea
dc.typeJournal Article


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