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International Journal of Zoology and Applied Biosciences

Volume (2) - Issue (5), 2017 pp 227-231

Title

Index value H, D and E of marine crab from Akkaraipettai coastal waters, Nagapattinam Area, Tamil Nadu, India

Author

U. Sathiya and V. Valarmathi

Abstract

The crustaceans are commercially important valuable sea food. The data collected on landings of crabs contributing directly to support the mankind. Nearly 13 varieties of commercially important species were identified during the study period January 2014 to December 2014 at the Akkaraipettai coastal landing in Nagapattinam area. Monthly variation in the total number of individuals (kg) was observed. The calculated index values showed that the highest Shannon’s diversity value observed was 0.113 (July), 0.111(August), 0.116 (September) and 0.102 (October). The Evenness index value was 0.110 (July), 0.109 (August), 0.113 (September) and 0.100 (October). The calculated richness index value was 3.432 (January), 3.400 (February), 3.465 (March), 3.615 (April) and 3.532 (June). Season wise mean (kg) variation of species recorded was premonsoon> monsoon> post monsoon> summer. From this study the highest and lowest index values for the crab species was calculated and recorded which is a useful technique to assess the crab species diversity in a marine ecosystem.

Keywords

Crab, Diversity, Richness, Evenness, Season, Index values.

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Article History

Received on 08/10/2017, Accepted on 12/10/2017, Published on 25/10/2017

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