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Population dynamics, diversity and community structure of Odonata were studied on three adjacent riparian microecosystems in Vadodara district, Gujarat, India. Population dynamics was studied by observing their population by point count method on three microhabitats (Mini River at Sankarda, Sindhrot and Mahi River at Fazalpur). In the course of a twenty-eight-week study, a total of 4783 Odonata were encountered on three microecosystems. Odonata density 9% throughout September 2014 (39th Meteorological Week) and gained its peak during October 2014 (44th Meteorological Week). A definite drop in the density was observed during November 2014 (48th Meteorological Week) and it achieved precisely 1% throughout December 2014 (51st Meteorological Week). Amongst the three microecosystems, at Fazalpur, species richness began rising from the 4th week of September (6%) and made it to its highest (11%) throughout the 4th week of October. At Sankarda, maximum absolute richness (12.61%) was recorded in 3rd week of October. At Sindhrot, the relative abundance of odonates started increasing in 3rd week of September (7%) and achieved its highest (13%) during 4th week of October. A total of twenty-five species were encountered in the terrain. The diversity index was maximum for Sankarda (2.35) followed by Fazalpur (2.27) and Sindhrot (2.01). A total of four species (Ditch Jewel (26.6%), Pigmy Dartlet (19.5%), Green Marsh Hawk (10.3%) and Senegal Golden Dartlet (8.3%) were dominant in all three microhabitats. [ABSTRACT FROM AUTHOR]

Odonate diversity reflected by wetland quality was carried out on three riverine wetlands (Fazalpur, Sankarda and Sindhrot) of Vadodara district in Central Gujarat during 2014-15. The value of Dissolve Oxygen (DO) and Biological Oxygen Demand (BOD) was highest and the values of Electrical Conductivity (EC), Chemical Oxygen Demand (COD) as well as total solids in the water were lowest at Fazalpur as compared to other sites. Sankarda Point was slightly more polluted than Fazalpur with a marshy habitat structure which is ideal habitat for Odonates. Odonates diversity was evaluated during September and October at eleven wetland sites around Anand and correlated with water quality parameters. Maximum species richness and species diversity index were recorded at Pariej tank which was the least polluted point. Minimum species richness was observed at Navagam Canal 2 (8 Species) and Canal 1 (10 species) all having huge loads of industrial effluents. The correlation coefficient between the water quality parameter and diversity index (H') showed that pH had a significant moderate positive correlation (P < 5.0, df. 9) and BOD3 had a significantly higher positive correlation (P < 1.0, df. 9). EC, Total Suspended Solids (TSS) and Total Solids (TS) had negative correlation with Odonate diversity. COD and Total Dissolved Solids (TDS) exhibited weak negative correlation with Odonate diversity. [ABSTRACT FROM AUTHOR]