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Title: Protozoa associated with leaf litter degradation in Coringa mangrove forest, Kakinada Bay, east coast of India
Authors: Dorothy, K. Padma
Satyanarayana, B.
Kalavati, C.
Raman, A. V.
Keywords: Mangrove leaf litter
east coast of India
Issue Date: Mar-2003
Publisher: CSIR
Abstract: 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 10<sup>5</sup> no. g<sup>-1</sup> dry weight) all others constituting 80-90% of the population followed by flagellates (4.8%), ciliates (4.4%) and, sessile ciliates (0.2%). <i>Chromulina</i> sp., <i>Spumella socialis</i> and <i>Euglena acus</i> (flagellates), <i>Cyclidium</i> sp., <i>Prorodon</i> sp., <i>Euplotoides aediculatus</i> and <i>Zoothamnium</i> sp. (ciliates) were relatively dominant (mean density 4,331 individuals l<sup>–1</sup>) in the litter collected from <i>Avicennia</i> plot. Flagellates, <i>Astasia</i> sp., <i>Heteronema</i> sp. and<i> Paranema</i> sp. and, ciliates, <i>Prorodon </i>sp<i>., Holosticha </i>sp. and<i> E. aediculatus</i> were, however, more common in <i>Excoecaria </i>(mean density 3719 individuals l<sup>–1</sup>). <i>In situ </i>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 <img src='/image/spc_char/micro.gif'>m), microciliates (20-100 <img src='/image/spc_char/micro.gif'>m), macrociliates (100-200 <img src='/image/spc_char/micro.gif'>m) and sessile ciliates. Nematodes indicated culmination. Bacterial (mean) biomass registered highest value (6.43x10<sup>-3</sup> mgC g<sup>-1</sup>) within 24 hours but decreased (3.1x10<sup>-6</sup> mgC g<sup>-1</sup>)<sup> </sup>by day-3 to 5. Mean flagellate biomass peaked (32.6 mgC g<sup>-1</sup>) by day-2 and microciliates (92 mgC g<sup>-1</sup>) by day-5 in summer and (47mgC g<sup>-1</sup>) by day-24 during monsoon. Macrociliates registered highest biomass (168.4mgC g <sup>–1</sup>) by day-6 in summer but lagged behind until day-26 to day-30 (154mgC g <sup>–1</sup>) 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.
Description: 45-51
ISSN: 0379-5136
Appears in Collections:IJMS Vol.32(1) [March 2003]

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