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Influence of Water Quality on the Biodiversity of Phytoplankton in Dhamra River Estuary of Odisha Coast, Bay of Bengal

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Influence of Water Quality on the Biodiversity of Phytoplankton in Dhamra River Estuary of Odisha Coast, Bay of Bengal March JASEM ISSN 1119-8362 Full-text Available Online at J. Appl. Sci. Environ. Manage. , 2011 All rights reserved www.bioline.org.br/ja Vol. 15 (1) 69 - 74 Influence of Water quality on the biodiversity of phytoplankton in Dhamra River Estuary of Odisha Coast, Bay of Bengal PALLEYI, S; KAR, R N; *PANDA, C R Institute of Minerals & Materials Technology, Bhubaneswar-751013, India *Corresponding author : [email protected] ABSTRACT: Dhamra estuarine ecosystem is a hotspot of rich biological diversity which supports a patch of mangrove along with unique flora and fauna. In this study, the diversity of phytoplankton population and other factors that control their growth and biodiversity were investigated. The samples were collected monthly from Dhamra estuary of Bay of Bengal at 6 different stations (grouped under three regions) from March -2008 to February -2009. A total of 41 genera of phytoplankton species belonging to 4 classes of algae were identified. The maximum value of 9.3 X 10 4 cells l -1 was recorded in post monsoon season. Phytoplankton of Bacillariophyceae, appearing throughout the year, and represent majority of population (75-94%) at all the sampling stations, followed by Dinophyceae (3-14%), Cyanophyceae (3-8%) and Chlorophyceae (0-4%) classes. The Shannon- weavers diversity index (H) remains between 0.22 and 2.49. Based on the correlation coefficient data, phytoplankton shows positive relationship with DO, salinity, nutrients and negative relationship with temperature and turbidity. Present study shows that the occurrence and diversity of these primary producers do not subscribe to a single dimensional phenomenon of a single factor, rather than, a consequence of a series of supported factors which will help to maintain and balance such type of fragile ecosystem. @JASEM Estuaries are characterized by the gradient of salinity is the world’s most important nesting beach for Olive in a semi enclosed coastal system, flourishing a group Ridley sea turtles on the Orissa coast of Bay of of organisms uniquely capable of using the salinity Bengal. gradient to a competitive advantage. Phytoplanktons represent the base of pelagic food webs in estuarine Although, a number of studies have been carried out ecosystem and play a major role in the global cycling on the ecological conditions of estuarine region, as of carbon, nitrogen, phosphorus and other elements Bay of Bengal is considered as a low productive zone and the regulation of earth’s climate. The biomass (Madhupratap, et al ., 2003), very limited work has distribution and species composition of been done in the east coast of Orissa. Moreover, not phytoplankton have important effects on carbon as much of information on phytoplankton species fixation rates and on transfer of energy in food webs. composition and diversity is available in this Studies of the abundance, distribution and particular estuarine region. composition of phytoplankton communities are, therefore, a fundamental contribution to our MATERIALS AND METHODS understanding of the structure and function of Sampling of surface water was carried out throughout estuarine ecosystems. Phytoplankton communities the year (March-2008 to February-2009) on a are multispecies communities, which are highly monthly basis at Dhamra River Estuarine region. A multifaceted in terms of their diversity and dynamics. total of 6 stations ,where station-1 and 2 covers the Successional shifts in phytoplankton community lower estuarine region (marine region, depth-63 ft), structure are mainly due to changes in environmental station-3 and station-4 covers the river mouth region variables such as nutrients and other physico- having depth of 27ft and 26ft, respectively and chemical variables which influence the distribution station-5 (26ft) and station-6 (26ft) were the riverine and abundance of plankton communities in estuaries region or fluvial region dominated by freshwater but (Cleorn, 1987; Ferreira et al ., 2005; Madhu et al ., subjected to tidal action. 2007). Water samples for the measurement of salinity, Estuarine regions are important sinks for several turbidity and nutrient parameters were collected in elements. In this study we tried to identify and asses Polypropylene bottles and for DO and BOD the trend of phytoplankton species diversity at measurement, water samples were collected in DO Dhamra Estuarine region with the water physico – bottles and analysed by Winkler method. The chemical parameters. Dhamra river is the union of temperature and salinity was measured in situ using river Brahmani and Baitarani, the two largest rivers sensor based Multi WTW 340i/set. Salinity was of Orissa, situated at the Bhadrakh district, just north again cross-checked by silver nitrate titration (Oxner, of the boundary of Bhitarkanika wild life sanctuary, 1920). Turbidity was measured by Nephlometric famous for its estuarine crocodiles and approximately method using HACH 2100P Turbidimeter. Basic 10 km from the Gahirmatha marine sanctuary, which nutrient parameters (nitrite, nitrate, ammonia and *Corresponding author : [email protected] 70 phosphate) were measured according to standard reflection of significant alteration in ambient methods (Grasshoff, 1999). For quantitative and conditions within an ecosystem. Basically, Diatom qualitative analyses of phytoplankton (Verlencar, (class- Bacillariophyceae), Dinoflagellates (class- 2004), a Sedgwick-Rafter plankton counting chamber Dinophyceae), Cocolithophores and Silicoflagellates was used and samples were examined (class- Chrysophyceae) and blue-green algae (class- microscopically by trinocular Nikon 90i Eclipse Cyanophyceae) are the principal phytoplankton taxa automated microscope. All 1,000 squares on the in the ocean. In Dhamra estuarine water sample, chamber were screened (Gilbert, 1942). Empty phytoplankton belonging to class Bacillariophyceae frustules were not included in the total counts. dominated over other classes of phytoplanktons at all Phytoplankton cell identifications were based on the 6 stations in the whole year (March-08 to Feb- standard taxonomic keys (Verlencar, 2004; Botes, 09). After Bacillariophyceae, some genus of 2003). The results are expressed as numbers of cells Dinophyceae, few of Cyanophyceae and occasionally L–1 and phytoplankton diversity was calculated using Chlorophyceae genus were observed (Fig 2). Shannon’s diversity index. (Shannon and Weaver, 1949) Plankton communities in the estuary can be served as an indicator for the change in ecosystems under the H = -∑ pi ln pi pollution stress. In ecology, a diversity index is a statistics, which is applied to measure the species Where H - is the diversity index; ln - is the natural biodiversity in an ecosystem. A stressed environment logarithm; i - is an index number for each species typically has a lower number of species with one or present in a sample; pi - is the number of individuals two species (those adapted to the stress) having many within a species (ni) divided by the total number of more individuals than the other species (Gao and individuals (N) present in the entire sample. Song, 2005). As our study area was identified as a low productive zone (Madhupratap et al ., 2003), the RESULT AND DISCUSSION diversity index remained between 0.22 and 2.49 Phytoplankton abundance and species composition throughout the year at all the sampling stations (Fig showed both spatial and seasonal variation. The 2). During the post monsoon season, as a result of dominant species recorded at different sampling fresh water flushing and changes in salinity, the stations belonged to the genera Coscinodiscus, estuarine region experiences the most dramatic Skeletonema, Nitzschia, Navicula, Thallasiothrix, change in phytoplankton species composition, as is Triceratium, Biddulphia, Ceratium, Rhizosolenia, evident from the diversity index data (Fig 2). The Thallasionema, Bacillaria, Chaetocerous, Melosira, highest phytoplankton population density reached 4 –1 Trichodesmium, Podosira, Pleurosigma . There was upto 9.3 x 10 cells l at river mouth region during succession of different species recorded during the month of December-2008 (in the post monsoon different sampling seasons at different sampling season). The total phytoplankton community during points. The numbers of phytoplankton genus under this proliferation was composed mainly of diatoms these classes are identified as Bacillariophyceae 31 and dominated by a single diatom species genus and several species, 2 genus of Chlorophyceae, Pleurosigma angulatum . Abiotic features in estuaries 6 genus of Dinophyceae and 2 genus of vary depending upon the degree of protection from Cyanophyceae. The percentage occurrence of water motion (waves, tidal currents), the quality of different phytoplankton groups with respect to total fresh water input and circulation patterns including phytoplankton taxa at six different stations of residence time of the water, depth and salinity Dhamra estuary throughout the year has been given gradient. Further abiotic factors change both in Figure-I. The Shannon’s diversity indexes were temporally and spatially, so that a wide variety of also graphically presented in Figure-II. The habitats exist in estuaries. Diversity and abundance correlation coefficient values of different physico- of phytoplankton are related to the physico chemical chemical and biological data of Dhamra estuarine parameters in general and more particularly to water samples throughout the year are presented in temperature, DO, BOD, salinity and nutrient Table 1.
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