Abstract
Species diversity and trophic structure of plankton communities have been considered as most important biological features. The Fisher (α) and Simpson (λ) indices and the information index H=-Σ pi log2 pi (Margalef) were used for evaluation of species diversity. The indices have been calculated within the group of filter feeders by numbers (α and H′) and biomass (λ and H″) of the species; the best results were obtained in the latter case. The index H=-Σ pi log2 pi is proposed for the quantitative evaluation of trophic structure, where a portion of an individual trophic group is taken as pi. The plankton material was collected by the R.V. “Vityaz” in the northern Indian Ocean in January through February, 1960. Analysis of characteristics of zooplankton distribution, species and trophic diversity in connection with characteristics of the water regime resulted in the definition of 3 types of the plankton communities: (a) those in intensive divergence zones; (b) those in poor divergence zones; (c) those in regions with stable water stratification or with feebly marked convergence, distiguished by different values of biomass, species diversity, and trophic group ratios.
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Timonin, A.G. The structure of plankton communities of the Indian Ocean. Mar. Biol. 9, 281–289 (1971). https://doi.org/10.1007/BF00372822
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DOI: https://doi.org/10.1007/BF00372822