Summary of Abstract Submission

Abstract Submission No. IO50-09-0018PresentationPoster

FROM PLANKTON TO FISH: A PERSPECTIVE OF ECOSYSTEM DYNAMICS IN THE EASTERN ARABIAN SEA

A C Anil*1

1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India

ABSTRACT :

Studies over the past five decades have shown that the characteristics of the ecosystem in the Eastern Arabian Sea (along the west coast of India), differ considerably from south to the north. This is also reflected in the fisheries of the region. Observations along the west coast of India show that the fishery in the north is dominated by carnivores, whereas the fishery of the south is dominated by planktivores and omnivores. The region is influenced by the monsoon, seasonal reversal of currents, upwelling during southwest monsoon and convective mixing in the north during winter. These events facilitate seasonal enrichment in nutrients and trigger primary production. Spatial heterogeneities during different seasons, in turn, affect the community structure. The differences in the composition of the primary producers and their influence on the food web dynamics are critical to the fishery. The area covered by the fishery has also expanded over the years in the region and other studies point out that expansion has apparently met its natural limits. An analysis of the factors that influence the functioning of the ecosystem and their implications is presented.