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Zooplankton biomass and abundance of Antarctic krillEuphausia superba DANA in Indian ocean sector of the southern ocean

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Abstract

Zooplankton sampling was carried out during the first six Indian Scientific Expeditions to Antarctica (1981—1987) to estimate krill abundance in the Indian sector of the southern ocean (between 35° to 70° S and 10° to 52° E). This study aims to understand the distribution of biomass of zooplankton, especially the krill, using the data collected by net sampling techniques. Total zooplankton biomass for all the sampling stations ranged from 9 to 684 ml/1000m3 (x: 143.34±138.61 SD; n=150). Biomass data grouped by 5° latitude interval shows the presence of higher biomass (x: 191 ml/1000 m3;n = 31) in the Antarctic divergence region (between 60° to 65° S). EuphausiidEuphausia superba DANA formed a considerable component of biomass and together with eggs and larvae represented over 60% (n = 39) of mean total zooplankton-biomass in the coastal ice region. The values for population density and biomass of adult-size krill varied between 0 to 4320 individuals and 6 to 305 ml/1000 m3, respectively.

The highest values were recorded between 62° to 69° S and between 16° to 30° E. A high density of krill larvae was encountered in the shelf region during January 1987 which was related to chlorophyll concentration. However, the values obtained during six consecutive summers showed that values of adult krill biomass at given location was highly variable and, hence, not comparable on inter-annual basis, during the sampling years.

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  1. National Institute of Oceanography, 403 003, Dona Paula, Goa, India

    B. S. Ingole & A. H. Parulekar

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  1. B. S. Ingole
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Ingole, B.S., Parulekar, A.H. Zooplankton biomass and abundance of Antarctic krillEuphausia superba DANA in Indian ocean sector of the southern ocean. J Biosci 18, 141–148 (1993). https://doi.org/10.1007/BF02703045

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