Species diversity and protozooplankton abundance in konam reservoir, visakhapatnam, andhra pradesh
Abstract
Protozooplankton plays a crucial role in aquatic ecosystems as primary grazers of phytoplankton and links to higher trophic levels. Their growth rates, abundance, biomass, and diversity serve as indicators of ecosystem health and pollution. A study was conducted in six stations of Konam Reservoir, during the period from July, 2015 to June, 2016 to investigate protozooplankton communities. During the study, two flagellate assemblages were identified: Cryptomonas-Peridinium (predominant at all stations) and Euglenids (seasonal occurrence). Ciliates formed three assemblages: Vorticella-Coleps (stagnant waters), Pelagostrombidium-Holophrya(catchment area), and Halteria-Strobilidiumgyrans (stations 2-4). These species were found to be more nutrient-dependent than water quality-dependent. The abundance of flagellates showed a gradual increase in their abundance from station 1 to 5 but the ciliates were more abundant at station 3 than at other locations. The gradual rise in ciliate composition from 1 to 3 and fall in 4 to station 6 may be attributable to the rich anthropogenic activity at station 3 than at other points of reservoir. In addition to the above, the flagellates cyanophycean and filamentous diatoms also occur in the reservoir waters playing significant role in the trophic levels of the aquatic ecosystems.
Keywords:
Protozooplankton, Flagellates, Cilitaes, Euglenids, Species DiversityDOI
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