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The annual pattern of distribution and abundance of tintinnids and copepods -taking them as the representatives of the major components of microzooplankton (20 to 200 µm) and mesozooplankton (200 µm to 2 mm), respectively-was studied at the Pichavaram mangroves (India). Monthly samplings were made from January to December 1989, covering three stations. For tintinnids, density varied from 60 to 44,990 org./m3. Agglomerated tintinnids were the dominant form. The maximum abundance (80,740 org./m3) of copepods was recorded in the freshwater and neritic water mixing zone (station 2) during summer and the lowest (80 org./m3) in the freshwater zone (station 1). The genera Acartia and Acrocalanus (belonging to the suborder Calanoida), Macrosetella and Euterpina (belonging to the Harpacticoida), and Oithona (belonginp to the Cyclopoida) were coincident with the maximum species abundance at station 2. Species like Acartia southwellii and Oithona brevicornis were observed during the lower abundance period. Calanoid and harpacticoid copepods were also dominant at station 3. A significant positive relationship between the abundance of tintinnids and copepods was observed. The seasonal distribution and abundance of tintinnids and copepods are discussed in relation to hydrographical parameters.
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