Abstract

Species diversity of benthic macro-organisms as measured by Shannon’s formula was highest on the outer continental shelf. Benthic diversity was higher in polyhaline zones of estuaries than on the shallow shelf and decreased sharply into the mesohaline zone, declining to the lowest in oligohaline zones. In addition to environmental stability and salinity regime, sediment grain size and pollution also affect species diversity. Analysis of the components of informational diversity, species richness and equitability indicates that the richness component accounts for most of the observed pattern, although both components are important to within-habitat differences.

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