STARDUST II - Spatial and Temporal Assessment
of high Resolution Depth profiles Using novel Sampling Technologies The fate of pollutants in fluvial and marine sediments in cross-border zones
Protozoa associated with leaf litter degradation in Coringa mangrove forest, Kakinada Bay, east coast of India
Dorothy, K.P.; Satyanarayana, B.; Kalavati, C.; Raman, A.V.; Dehairs, F. (2003). Protozoa associated with leaf litter degradation in Coringa mangrove forest, Kakinada Bay, east coast of India. Indian J. Mar. Sci. 32(1): 45-51
In: Indian Journal of Marine Sciences. National Institute of Science Communication and Information Resources, CSIR: New Delhi. ISSN 0379-5136; e-ISSN 0975-1033
Observations (1995-'96) on mangrove leaf litter revealed a variety of microorganisms dominated by bacteria (5 types), 12 species of flagellates, 2 sarcodines, 17 ciliates, 2 suctorids and 2 sessile ciliates besides several diatoms, nematodes and nauplii. Overall, bacteria outnumbered (4.59 x 105 no. g-1 dry weight) all others constituting 80-90% of the population followed by flagellates (4.8%), ciliates (4.4%) and, sessile ciliates (0.2%). Chromulina sp., Spumella socialis and Euglena acus (flagellates), Cyclidium sp., Prorodon sp., Euplotoides aediculatus and Zoothamnium sp. (ciliates) were relatively dominant (mean density 4,331 individuals l-1) in the litter collected from Avicennia plot. Flagellates, Astasia sp., Heteronema sp. and Paranema sp. and, ciliates, Prorodon sp., Holosticha sp. and E. aediculatus were, however, more common in Excoecaria (mean density 3719 individuals l-1). In situ experiments on leaf decay showed that the entire process lasted 12-18 days in summer and 26-32 days during monsoon. Bacteria were the first to settle, followed by nanoflagellates (2-20 µm), microciliates (20-100 µm), macrociliates (100-200 µm) and sessile ciliates. Nematodes indicated culmination. Bacterial (mean) biomass registered highest value (6.43 x 10-3 mgC g-1) within 24 hours but decreased (3.1 x 10-6 mgC g-1) by day-3 to 5. Mean flagellate biomass peaked (32.6 mgC g-1) by day-2 and microciliates (92 mgC g-1) by day-5 in summer and (47 mgC g-1) by day-24 during monsoon. Macrociliates registered highest biomass (168.4 mgC g-1) by day-6 in summer but lagged behind until day-26 to day-30 (154 mgC g-1) during monsoon. A distinct prey predator relationship, direct dependence of ciliate species on nanoflagellate and bacterial populations as well as, a well marked microbial community succession were evident.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders
French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)
