Ecology, Environment and Conservation Paper

Vol.07, Issue 03, 2001; Page No.(289-295)

BLOOMS OF LEPTOCYLINDRUS SPECIES AND THEIR SUBSURFACE AGGREGATION IN THANE CREEK9 INDIA

Vidya Ullal, Goldin Quadros, Vidya Mishra, K.S. Gokhale and R.P. Athalye.

Abstract

Blooms of diatom, Leptocylindrus spp were observed in the shallow region ofThane creek, west coast of India, during postmonsoon (October to March, I 991-92 and 1992-93) when there was a build up of nutrients.The blooms formed subsurface aggregates at approximately half meter depth and below, under certain environmental conditions such as abrupt change in salinity at the onset of the bloom and depletion of nutrients in the surface waters. No toxic effects of the diatom blooms were apparent. In fact, formation of aggregates and their sinking improved light penetration.Termination of the blooms occurred due to depletion of nutrients, primarily the nitrates, associated with rise in salinity and temperature during summer.

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