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Coexistence of species of Acartiidae (Copepoda) in the Cochin Backwater, a monsoonal estuarine lagoon

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Abstract

A study was made of copepods of the family Acartiidae which form the dominant component of the plankton in the Cochin Backwater (Kerala, India). At least nine species inhabit the backwater at one time or another, more than have been recorded for any other area. Reasons were sought for this diversity. The surface plankton was sampled from the head of the estuary to the mouth and from one season to another. There were large seasonal changes in salinity (0 to 35 ‰), due to monsoonal flooding, and associated changes in species composition. Species diversity was highest during the dry season and lowest in the wet. It is suggested that this annual catastrophic flooding leads, in the long run, to high species diversity by imposing a regular check on interspecific competition.

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Author notes

  1. D. J. Tranter

    Present address: CSIRO Division of Fisheries and Oceanography, P.O. Box 21, 2230, Cronulla, N.S.W., Australia

Authors and Affiliations

  1. Indian Ocean Biological Centre, Cochin, Kerala, India

    D. J. Tranter & S. Abraham

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  1. D. J. Tranter
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  2. S. Abraham
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Communicated by G. F. Humphrey, Cronulla

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Tranter, D.J., Abraham, S. Coexistence of species of Acartiidae (Copepoda) in the Cochin Backwater, a monsoonal estuarine lagoon. Mar. Biol. 11, 222–241 (1971). https://doi.org/10.1007/BF00401271

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