<Original>Preliminary results on seasonal changes of radiolarian fluxes in the monsoonal environment in the Arabian Sea

Iijima Katsunori, Takahashi K., Ittekkot V., Nair R.R.

An international collaborative effort has been expended since 1986 to collect marine particle fluxes in the Arabian Sea. High biological productivity mainly due to Monsoon occurs twice a year in the region. The south west (SW) Monsoon occurs in June to September and the north eastern (NE) Monsoon occurs in Decenber to February with a varying degree depending on the regions. PARFLUX sediment traps have been deployed at three locations in the western, central, and eastern Arabian Sea, each consisting of two traps, one at 1,000m below the sea surface ano the other at 1,000m above the sea bottom. In this report the data from the shallow traps are presented. At Western Station much of the annual radiolarian fluxes have been measured during the SW Monsoon. At Central Station during the NE Monsoon total radiolarian fluxes exceeded significantly that of the SW Monsoon. At Eastern Station an increase of total radiolarian fluxes are observed during NE Monsoon. Details of the seasonal flux patterns of individual species, however, are unique, reflecting subtle change in environmental parameters. Three major patterns of radiolarian fluxes are observed : (1) high fluxes during NE monsoon : Phormacantha hystrix and Pseudodictyophimus gracilipes ; (2) high fluxes during intermonsoon period : Tetrapyle octacantha and Lithomelissa setosa ; and (3) high fluxes during SW Monsoon : Cladococcus viminalis. Fluxes of Cladococcus viminalis occured during only SW Monsoonal upwelling period and thus this taxon is considered to be a monsoonal upwelling species.

<Original>Preliminary results on seasonal changes of radiolarian fluxes in the monsoonal environment in the Arabian Sea

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