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International Journal of Zoology and Applied Biosciences Research Article
Index value H, D and E of marine crab from Akkaraipettai coastal waters, Nagapattinam Area, Tamil Nadu, India
U. Sathiya and V. Valarmathi
Year : 2017 | Volume: 2 | Issue: 5 | Pages: 227-231
Received on: 10/08/2017
Revised on: 10/10/2017
Accepted on: 10/12/2017
Published on: 10/25/2017
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U. Sathiya and V. Valarmathi( 2017).
Index value H, D and E of marine crab from Akkaraipettai coastal waters, Nagapattinam Area, Tamil Nadu, India
. International Journal of Zoology and Applied Biosciences, 2( 5), 227-231.
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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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© The Author(s) 2025. This article is published by International Journal of Zoology and Applied Biosciences under the terms of the Creative Commons Attribution 4.0 International License (creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
