PHYTOPLANKTON PRIMARY PRODUCTION IN A MESOTROPHIC POND IN SUBTROPICALBANGLADESH

Annual gross primary productivity in mesotrophic Shahidullah Hall pond (Dhaka, Bangladesh) was 1383.35 g C m(-2) y(-1) (arithmetic mean). Da ily primary productivity (between 1.6 and 6.8 g C m(-2) d(-1) was corr elated with chlorophyll a, day length and dissolved silica. Chlorophyl l a related significantly with k, incident light, SRP, alkalinity and conductivity. A negative correlation existed between biomass and rainf all. Productivity, biomass, conductivity, alkalinity, and SRP increase d after mid-winter. k, I-k and Z(en) varied according seasonally. P-ma x related directly with temperature. Seasonal variation of proportiona l to(B) was 0.0049-0.0258 mg C (mg chl a mmol PAR)(-1) m(-2). Q(10) wa s 2.12, community respiration 1334.99 g C m(-2) y(-1), and the underwa ter light climate 186.43 mu E m(-2) s(-1).