Aquatic Insect Fauna and Diversity in Urban Fresh Water Lakes of Tripura, Northeast India (original) (raw)

Freshwater lakes are integral part of aquatic ecosystem and provide numerous benefits to human beings directly or indirectly. Aquatic insects are the primary bio-indicators of freshwater bodies such as lakes, ponds, wetland, streams and rivers. The presence or absence of certain families of aquatic insects can indicate whether a particular water body is healthy or polluted, because they cannot escape pollution and show the collective effects of short and long term pollution events. An investigation was carried out to study the aquatic entomofauna, their diversity and distribution in eight stations of LakhaBanjaralake of Sagar (M. P.) for a period of six months from July 2014 to December 2014. The aquatic insects were sampled systematically and randomly in station-wise habitats, using standard protocols. A total of 2207 individuals representing 12 species belonging to 12 genera, 10 families and 4 orders were recorded. Among the collected insects Hemiptera ranked first with the large population of individuals and percentage (87%). The orders followed by Hemiptera in their number and percentage were Coleoptera (7%), Odonata (4%) and Diptera (2%).

Abstract:The present work deals with the diversity of aquatic insects and physico-chemical parameters of Kelageri Lake, Dharwad, Karnataka, India. It is one of the biggest lakes in Dharwad district, which used to facilitate drinking water and irrigation needs of Dharwad and was also known for its range of floral and faunal diversity. The aquatic entomo-fauna and physico-chemical parameters were studied using standard protocols. Aquatic insects belonging to eleven species under nine families and one spider family were collected during the present study. The taxonomic groups (order) encountered were Hemiptera, Coleoptera, Odonata, Acarina, Araneae (spider). The order Hemiptera was the most abundant and prominent having more number of species (04), while order Coleoptera was represented by three species and least number (01) of species were observed in the order Odonata, Acarina, Araneae. The highest numbers of individual species were observed during the month of January and June and l...

29 species of aquatic insects have been recorded from a weed infested man made wetland near Tamluk Station. Hemiptera was numerically the most abundant group comprising 39% of the total aquatic insects followed by Coleoptera (36%) and Odonata 25%. Hemiptera and Odonata were represented by 10 species each while Coleopteran was represented by 9 species. Of these only one coleopteran species, Canthydrus latitabilis was found to be dominant. The water body under investigation was considered moderately polluted. On the basis of Diversity index, Evenness value and Dominance value indicated the equitability and heterogeneity of the aquatic system. While Coleoptera and Odonata exhibited a peak in July and May respectively but no distinct peak could be seen for Hemiptera. Correlation between the abiotic factors and insect species revealed that abiotic factors had some regulatory effects on aquatic insect population.

The present study deals with the aquatic insects survey conducted from March 2018 to May 2018 in Semara Taal. This study enumerated 20 different species belonging to 6 orders and 19 families. Order Hemiptera represent the highest number of species (8 genera) followed by Diptera (4 genera), Coleoptera (3 genera), Odonta (2 genera), Ephemeroptera (2 genera), and Trichoptera (single genus). Dominance of Hemipteran, Odonata and Coleoptera insects suggested that the Semara taal is relatively less polluted.

In total 20 species of aquatic insects have been recorded from a weed infested pond. Odonata was numerically the most abundant group constituting of 54% of the total aquatic insects even though these belonged to three species. Coleoptera though constituted only 22% of aquatic insects had 10 species. Urothemis signata and Ranatra filiformes were eudominant and dominant species respectively. Hydrometra butlen is recorded from West Bengal for the first time. Five species of Hemiptera, Ranatra filiformes, Ranatra elongata, Diplonychus rusticus, Micronecta merope, Gerris nitida and Hydrometra butlen; three species of Odonata, Urothemis signata, Agriocnemis pygmoea and Enllagma parvum and one species of Coleoptera viz., Coplatus indicus have been recorded from Paschim Medinipore district for the first time. Species diversity and evenness indices fluctuated from month to month and from one sampling site to other being <1 suggest a stressed and disturbed environment.

A study on aquatic insects biodiversity and abundance along with physicochemical parameters of two lentic water bodies (Varuna and Dalvoy) of Mysore district was carried out on monthly basis from October 2018 to March 2019. A total of 31 species belonging to 19 families and 6 orders were recorded during the study period. At order level, Coleoptera showed maximum relative abundance (57%) followed by Hemiptera (13%) in Varuna Lake, while in Dalvoy Lake, the order Hemiptera (66%) was most abundant, followed by Coleoptera (16%). Computation of dominant status of different species of aquatic insects in lakes based on Engelmann's scale revealed that Canthydrus laetabilis and Gyrinus distinctus, from the order Coleoptera, were dominant in Varuna Lake, while two Hemipteran species, Diplonychus rusticus and Anisops sp., were dominant in Dalvoy Lake. The highest Shannon diversity index (2.803) and evenness values (0.66) were recorded in Varuna Lake, which was slightly greater than Dalvoy Lake (2.028 and 0.45). Similarly, the Biological Working Party Score (BMWP) and Average Score Per Taxon (ASPT) values were 80 and 5.33 in Varuna Lake and 53 and 4.08 in Dalvoy Lake. This indicates Varuna Lake is less polluted and has higher species diversity than Dalvoy Lake. In terms of the physico-chemical properties of water, a significant difference was noted in electrical conductivity, total dissolved solids, free carbon dioxide, dissolved oxygen, total alkalinity, hardness, nitrate, sulphate, and chloride concentrations between Dalvoy Lake and Varuna Lake. The results of physicochemical analysis and diversity indices suggest stressed and disturbed water quality conditions at Dalvoy Lake.

An investigation was done to study the diversity of aquatic insect community and physico-chemical parameters in Sagar Lake, India. The aquatic insects were collected by using insects net from the study area during the month of November 2013 to October 2014. The aquatic insect community was represented by 10 species, 10 genus, 12 families and 4 orders. The most abundant order was Hemiptera, followed by Coleoptera during study period. Physico-chemical parameters studied were Temperature, pH,

A study was carried out on the diversity and density of aquatic insect community in the two urban temple ponds – Radhamadhav akhra pond and Mandir dighi pond of Silchar town, Assam, Northeast India. All total 22 taxa of aquatic insects were recorded, 13 taxa from Radhamadhav akhra pond and 18 taxa from Mandir dighi pond. 9 taxa were found common in both the ponds. In Radhamadhav akhra pond classical relationship of dissolved oxygen and free carbon dioxide was established with low dissolved oxygen and high free carbon dioxide concentration. Pearson correlation coefficient analysis showed that the number of taxon was highly correlated with the density of taxon in both the ponds. Canonical correspondence analysis revealed that for Radhamadhav akhra pond, eigen values were 0.784 for axis 1 and 0.630 for axis 2 while for Mandir dighi pond eigen values were 0.825 for axis 1 and 0.740 for axis 2. Taxonenvironment correlation showed that aquatic insect community and environmental variables were highly correlated in both the ponds. Shannon diversity index of Radhamadhav akhra pond was in the range of 1.5−1.7 and Mandir dighi pond was in the range of 1.9−2.0. According to the dominance status by Engelmann’s Scale, only Rhagovelia sp. was found Eudominant in Radhamadhav akhra pond. No eudominant taxon was found in Mandir dighi pond.