Abstract
Gross and net primary production together with chlorophyll-a biomass were investigated with respect to depth and diurnal changes in three categories of inland waters (reservoirs, temporary ponds, brackish water lagoons) in Sri Lanka. Ten field sites, in both the dry and wet zones of the island, were investigated. Bimodal productivity profiles were recorded in two of the three reservoirs studied. The diel pattern of net photosynthetic rate varied between sites although peak photosynthetic efficiency occurred at solar noon. Surface photoinhibition was characteristic of the reservoirs and brackish water lagoons but not of the temporary ponds. Mean gross primary production was 3.02 g C m−2 d−1 but was higher in the temporary ponds than in the reservoirs. The gross primary production in the brackish water Koggala Lagoon at 0.08 g C m−2 d−1 is a record low for tropical lagoons and was 2.5 times less than the two other lagoons investigated. Variability in net primary production between sites was similar to the variation in gross production with a relatively low mean value for tropical inland waters of 0.495 C m−2 d−1. Mean maximum photosynthetic rate was 0.30 mg C m−3 h−1 but was lower in the reservoirs than in the temporary ponds and lagoons.
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Silva, E.I.L., Davies, R.W. Primary productivity and related parameters in three different types of inland waters in Sri Lanka. Hydrobiologia 137, 239–249 (1986). https://doi.org/10.1007/BF00004237
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DOI: https://doi.org/10.1007/BF00004237