| 1 | Human's impacts on the Pichavaram mangrove ecosystem a case study from Southern India Various type of human settlement and activities along the mangrove ecosystem in Pichavaram, Tamil Nadu (India) are described. This mangrove ecosystem is influenced by mixing of neritic water, brackish water and fresh water. Coastal human communities are highly dependent on mangrove ecosystem. Activities like grazing, bund construction for fishing, aquaculture and reclamation of land have caused erosion of the banks, species extinction, and ecological imbalance of the mangrove ecosystem Source: Krishnamurthy, K.; Jeyaseelan, M.J.P. Proceedings of the Asian Symposium on Mangrove Environment Research and Management. Soepadmo, E. ; Rao, A.N. Eds. 1984; 624-632. 0237. | ||
| 2 | Relationship between plankton and finfish and shellfish juveniles in Pichavaram mangrove waterways, south east coast of India Qualitative and quantitative assessments of phytoplankton in Pichavaram mangrove, Tamil Nadu, India waterways were made monthly for a period of two years (1980-82) in order to investigate the relationship between phytoplankton abundance and that of the juveniles of commercially important finfish and shrimps. Totally 84 species of phytoplankton comprising 74 species of diatoms, 5 species of dinoflagellates, 4 species of blue green algae and 1 species of green alga were recorded. The density of phytoplankton ranged from 12 to 40,11,872 cells/1 during the period with peaks during summer and post-monsoon seasons. The positive relationship observed between the phytoplankton and the finfish and shrimp juveniles, indicates that phytoplankton could be one of the major factors influencing the temporal fluctuations of the populations of fish juveniles in this mangrove biotope. Source: Chandrasekaran, V.S. Seaweed Res. Util.. 22(1-2); 2000; 199-207. 1131. | ||
| 3 | Studies on benthic nitrogen flux in a mangrove ecosystem The benthic nitrogen fluxes in the mangrove ecosystem of Achra Estuary, Ratnagiri, Maharashtra, India has been studied. The work was carried out at three stations along the estuary representing vegetated, partially vegetated and non-vegetated areas. It examined the sources of nutrients, their relationships and the influence of physical and biological processes on their abundance and distribution. The spatial heterogeneity in the nutrient pool was characterised by variations in the sediment structure, organic load and microbial mineralization rates. Ammonium was the dominant form of nitrogen at the mangrove zone whereas nitrate, at the non-mangrove zone. The autochthonous and allochthonous sources activity influenced the nutrient pool in different seasons. The benthic microalgal population showed significant succession in the taxonomic species composition and cell size structure with the season. The microbial processes were active in the non-monsoon months and showed well-marked spatial variations. The benthic microalgae utilized nitrogen nutrients from the overlying waters, besides from the pore waters. The spatial variations in the uptake rates were mainly due to the variations in the phytobenthos biomass at each locality Source: Dham, V.V. 2000; 165; pp. 1137.
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