Ecology and Distribution of Soil Protozoa in the Bellanwila Wetland

Abstract

The present investigation into the protozoan population and distribution in a wetland ecosystem revealed thatthe wetland soil facilitates a large number of species to live. Most probably due to the continuous moisture condition which enhance the appearance of additional species. 29 species of protozoa have been reported during this study period. Of them 8 species were amoebae, 14 species were ciliates and 7 species were flagellates. Of the amoebae Arcella sp. was the most widespread, being found in all 3 soil environments. Of the flagellates, Astasia sp. was the predominant type. Colpoda sp. was the commonest ciliate found during the whole study period. Not all the 29 species of protozoa occurred at the same time and in all the 3 selected study areas. Of the measured abiotic factors, temperature and soil moisture exerted general effects but pH and other chemical parameters showed no direct correlation. Also high content of organic matter in wetland soil influenced the growth of testaceans. Seasonal and spatial variations of protozoa both in number and types were seen.