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Diversity and Distribution of Zooplankton in Ropar Wetland (Ramsar Site) Punjab, India

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Diversity and Distribution of Zooplankton in Ropar Wetland (Ramsar Site) Punjab, India Nature Environment and Pollution Technology p-ISSN: 0972-6268 Vol. 18 No. 2 pp. 451-458 2019 An International Quarterly Scientific Journal e-ISSN: 2395-3454 Original Research Paper Open Access Diversity and Distribution of Zooplankton in Ropar Wetland (Ramsar Site) Punjab, India Onkar Singh Brraich and Saima Akhter† Department of Zoology and Environmental Science, Punjabi University, Patiala-147 002, India †Corresponding author: Saima Akhter ABSTRACT Nat. Env. & Poll. Tech. The present study reveals the diversity, abundance and composition of zooplankton in Ropar wetland. Website: www.neptjournal.com A total of 17 genera of zooplankton population were recorded and categorized into 5 different groups, Received: 01-10-2018 i.e. Protozoa, Rotifera, Cladocera, Copepoda and Ostracoda at all the sites (S1, S2, S3 and S4) from Accepted: 09-12-2018 October 2015 to September 2017. Among these, Protozoa and Rotifera were the dominant groups consisting of 6 genera each. Of all the seasons, summer season depicted the highest density of Key Words: zooplankton at all the sites and lowest diversity during monsoon season. The diversity indices were Ropar wetland observed to be maximum at S2 and S4 sites as compared to S1 and S3 sites indicating that the wetland Zooplankton is moderately polluted as the values of Shannon-Weaver diversity index for zooplankton are above Diversity indices two in different seasons. This signifies that this wetland receives pollution from various sources, but Seasonal variation still has low impact. The correlation of zooplankton population has also been studied with different Correlation pyhsico-chemical parameters, which showed a negative correlation with dissolved oxygen (DO) and free CO2 at all the sites and also with total dissolved solids (TDS) at S3 site. INTRODUCTION tration in their bodies as per the external environment (Law- rence et al. 2004, Ojaveer et al. 2010). In semi-enclosed Zooplankton being heterotrophic organisms and foremost water bodies, factors like warming of surface waters and trophic link in food chain play a pivotal role in aquatic freshwater input are very important in the process of stratifi- ecosystems by cycling of organic materials, energy transfer cation (Rabalais et al. 2002). These environmental param- in the food web and energy transfer from primary producer eters ultimately affect the composition and density of to secondary consumer (Steinberg & Robert 2009). Apart zooplankton by affecting their breeding (Greenwood et al. from this, certain species of zooplankton have the ability of 2001). The present study was conducted to assess the diver- indicating the deterioration in the quality of water caused sity and distribution of zooplankton in Ropar wetland by pollution or eutrophication (Mahajan 1981). The sur- (Ramsar site) Punjab, India. vival and growth of fishes are directly related to zooplankton due to the fact that they feed on them and also serve as base MATERIALS AND METHODS of food chains and food webs in all aquatic ecosystems (Miah et al. 2013, Shivashankar & Venkataramana 2013). Study area: Ropar Wetland is a man-made freshwater The ability of zooplankton to react rapidly to the changes riverine as well as lacustrine wetland. It came into existence in environmental conditions as well as physical and chemi- with the impoundment of water by constructing a barrage cal conditions of water body makes them a good indicator on the River Sutlej near Ropar town. It was created in 1952 of changes occurring in water quality, thus helping in un- on the Sutlej River in the Punjab State of India, by building derstanding the status of water pollution (Contreras et al. a head regulator to store and divert water for beneficial uses 2009). Numerous factors like physico-chemical properties of irrigation through canals, drinking and industrial water of habitat, biotic factors and climate change affect the oc- supply (Fig. 1). It is situated at 30°58’-31°02’ N latitude currence and distribution of plankton fauna (Richardson and 76°30’-76°33’ E longitude. This important ecological 2008, Rajagopal et al. 2010, Ahmad et al. 2011, Alexander zone is located in the Shivalik foothills of the Lower Hima- 2012). Environmental factors like water temperature serve layas. Shallow water features exist along both the sides of as an essential element, affecting the growth and develop- the river located within the wetland area. Climatically this ment of organisms, thus controlling their death rate (Hall & area is sub-moist or humid and comparatively less hot re- Burns 2001, Andrulewicz et al. 2008, Tunowski 2009). An- gion of Punjab with mean annual rainfall of 1518 mm. The other environmental factor like salinity, significantly af- total area covered by the wetland is 1365 ha, which in- fects the organisms as they have to adjust the saline concen- cludes 800 ha area of the river and the reservoir, 30 ha of 452 Onkar Singh Brraich and Saima Akhter forest area named as Sadabarat Forest (Evergreen) and 30 ha Data analysis: Statistical analysis of the data was made in under marshy plants, which serves as an important habitat Microsoft Excel and PAST software. The statistical calcula- for some rare and threatened species of the Shivalik foot- tions like range, statistical mean, standard deviation (S.D.) hills. It is also an important staging and resting ground for and Pearson correlation coefficient between different migratory waterfowl (Ladhar 2005). physico-chemical factors and zooplankton diversity were Collection, preservation and identification of zoopla- determined. nkton samples: Four representative sampling sites, i.e. S1, Determination of diversity indices: The percentage occur- S2, S3, S4 were identified keeping in view of the variation rence and relative numerical abundance of zooplankton were in the microhabitat and hydrological features of the Ropar subjected to diversity analysis using different indices like wetland (Fig. 1). Sampling sites were recognized with an Shannon Diversity Index “H” (Shannon & Weiner 1963), objective of obtaining zooplankton samples and physico- Pielou Evenness Index “J” (Pielou 1969) and Simpson Di- chemical characteristics from the wetland. Samples were col- versity Index “D” (Simpson 1949). lected monthly from October 2015 to September 2017 for a RESULT AND DISCUSSION period of two years. A nylon bolting cloth plankton net was used having a mesh size of 24 mesh/mm2 for collection of Zooplankton, being an important biotic element of aquatic plankton samples. One hundred litres of water was sieved ecosystems, has a huge impact on all its essential compo- every time through the net. Samples were collected and pre- nents, viz. food chain, energy flow and trophic networks. served in plastic sample bottles containing formaldehyde Aquatic environments have varied abundance and compo- solution (5%) and kept in the laboratory for identification sition of zooplankton, which renders ecological importance and further analysis as per Trivedy & Goel (1986) and APHA to their biomass and makes it a viable tool for assessing (2012). In the laboratory, plankton slides were prepared for global warming, pollution, eutrophication and other envi- identification. Using binocular and light microscope, iden- ronmental problems. Zooplankton plays a pivotal role in tification and counting of zooplankton was done. To deter- transferring energy inside food web, from primary produc- mine the density, Sedgwick Rafter Counting Chamber ers to secondary consumers and recycling of nutrients. The (Welch 1948) was used. The planktons were identified to present study was carried out for a period of 2 years from genus level as per the guidelines given by Needham & October 2015 to September 2017 to examine the distribu- Needham (1966), Kodakar (1992), Edmondson (1992), tion, assemblage structure and seasonal variations of Gupta (2012), APHA (2012), Gupta (2012). zooplankton diversity of Ropar wetland. During the present study, 17 genera of zooplankton population were recorded and these were categorized into 5 different groups i.e. Pro- tozoa, Rotifera, Cladocera, Copepoda and Ostracoda at all the sites. Among these 17 genera, Protozoa and Rotifera consists of 6 genera each, Cladocerans and Copepods com- prises of 2 genera each and Ostracods with 1 genus only at all the sites (Tables 1, 2, 3, 4). Our results are in coherence with Negi & Negi (2010) who studied the zooplankton di- versity of Hinval freshwater stream at Shivpuri of Garhwal region (Uttarakhand) and reported a total of 16 genera among which rotifers constituted the major zooplanktonic diver- sity (7 genera) followed by Protozoans (4 genera), Cladocerans (4 genera) and Nemata (1 genus). Similar study on zooplankton diversity of Julur Nalgonda district revealed 26 genera of zooplankton, out of which 8 genera were repre- sented by Rotifers, 5 by Copepods, 12 by Cladocera and 1 by Ostracods (Ankathi & Piska 2009). Another study on zooplankton diversity of a tropical wetland system reported 36 genera of zooplankton, categorized into 6 groups, Rhizo- poda, Cladocera, Rotifera, Ciliophora, Copepoda and oth- ers included Zooflagellates, Ostracoda, Callanoids and Herpacticoids (Nirmal Kumar et al. 2011). The zooplankton Fig. 1: Map of Ropar Wetland. diversity of Ambadi reservoir, Talika Kinwat, Maharashtra Vol. 18 No. 2, 2019 Nature Environment and Pollution Technology DIVERSITY AND DISTRIBUTION STATUS OF ZOOPLANKTON IN ROPAR WETLAND 453 showed 17 species of zooplankton. These included 6 spe- monsoon season, whereas maximum peak density was re- cies of rotifers, 4 species of copepods, 6 species of cladocerans corded in pre and post monsoon seasons but the former peak and 1 species of ostracods (Kamble & Mudkhede 2013). was higher than pre monsoon in some lentic water bodies of Our results are also parallel to Brraich & Kaur (2015) who Karwar (Vasanthkumar et al. 2015). The low population recorded 17 genera of zooplankton in Nangal wetland, clas- density of zooplankton during monsoon season may be at- sified into 5 different groups, Protozoa (6 genera), Rotifera tributed to the dilution factor by rain and high water level (6 genera), Cladocera (2 genera), Copepoda (2 genera) and (Akbulut 2004, Mulani et al.
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