There was a unique brackish water ecosystem and affected a chance in the plankton composition at lagoon and riverside in Segara Anakan Cilacap. This study aimed to map phytoplankton and zooplankton composition consisting of freshwater and marine plankton from the lagoon to the marine entrance in the west part of Segara Anakan Cilacap. The survey method was taken with purposive random sampling in fourteen stations and four replicates with new and full moon conditions from March to April 2018 in a wet season. The result showed 52 species of plankton. All species belonged to phylum Cyanophyta (9 species), Chlorophyta (13 species), Chrysophyta (19 species), Euglenozoa (2 species), Rotifera (2 species) and Arthropoda (7 species). Of the 52 species collected in all stations and replicates, phytoplankton has a greater species richness (41 species) than zooplankton (11 species). And also, freshwater plankton (47 species) has a higher species richness than marine plankton (5 species) due to the wet season condition causing freshwater enters brackish water. The largest freshwater of River Citanduy enters the brackish water of Segara Anakan mangrove ecosystem in Cilacap and causing the freshwater phytoplankton abundance, especially Staurastrum sp. in inland waters of Segara Anakan Cilacap.
The present investigation deals with the comparative study of zooplankton diversity in two different lentic ecosystem of Patna, Bihar classified as pristine (Sanjay Gandhi Biological Park) and disturbed (Nalanda medical college and hospital) pond which deals with the interrelationship between composition of zooplankton community and various physiochemical parameters of water. The study was carried out from July to September 2015 and three groups of zooplankton taken into consideration that includes Rotifera, Cladocera and Copepoda. A total of 38 species of zooplanktons were observed from the study sites and dominated by Rotifera by 18 species (47.36%), followed by the species of Cladocera and Copepoda by 11 species (28.94%) and 9 species (23.68%), respectively. Out of the total of 38 species, about 8 species (21%) were common in both ponds. The diversity and richness of zooplankton are higher in unmanaged pond. However, both ponds are considered as polluted based on the physiochemical characteristics of water and presence of pollution indicating zooplankton species which exhibit eutrophication.
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