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Journal of Entomology and Zoology Studies , 2017
A study on diversity of odonates was conducted at Kuvempu University Campus located in Bhadravti Taluk, Shivamogga District of Karnataka. The study was conducted to explore status, diversity and threats of Odonates during February 2012 to January 2014. During the study period, a total of 43 species of Odonates in 31 genera belonging to 7 families have been reported. Among them the order-Anisoptera (Dragonflies) dominated with 30 species, followed by the order-Zygoptera (damselflies) with 13 species. The family Libellulidae dominated with 24 species among the Anisoptera. Among the Zygoptera, Coenagrionidae was found to be the dominant family with 8 species. The occurrence of IUCN categorized two Near Threatened species like Vestalis gracilis and Indothemis carnatica, one Data Deficient species like Orthetrum pruinosum and one Endemic species like Anaciaeschna jaspidea were remarkable this indicates that, the area was found to be rich in odonate diversity.
International Journal of Zoology Studies, 2018
The study was conducted to find out the status, diversity and conservation threats of Odonata at Dyamannana Lake, Shivamogga Disrtict during October 2015 to September 2016. Sampling was done by direct counts method and collected data were statistically analyzed to work out the magnitude of Odonate diversity. A total of 470 individuals of odonates belonging to 41 species in 29 genera under 6 families were recorded. The order-Anisoptera was found to be the most dominant with 76% (n=31) species, belonging to 3 families, followed by order-Zygoptera with 24% (n=10) species, under 3 families respectively. Among the order-Anisoptera, the family wise, abundance, richness, diversity and evenness indices was found to be maximum in Libellulidae (340, 4.1, 2.9, 0.72) followed by the Aeshnidae (38, 0.8, 1.3, 0.93) and minimum in Gomphidae (26, 0.3, 0.7, 1.0) respectively (Table 2). Similarly, among the order: Zygoptera, it was found to be maximum in Coenagrionidae (42, 1.6, 1.9, 0.92) and minimum in Platycnemididae (12, 0.5, 0.6, 0.94), however, it was least in Lestidae (12, but showed no significant indices value with only single species) respectively. The study revealed that, odonates and their habitats were under threat due to intensive anthropogenic activities, which are attributed to encroachment and loss of habitat. Also, addition of fertilizers and insecticides from the surrounding arecanut plantation lead to pollution and eutrophication of the lake, which not only affect the assemblage of Odonata population but also cause local extinctions.
A preliminary study on diversity status of Odonates in and around college of forestry Campus
Journal of Entomology and Zoology Studies, 2021
Odonata is an insect order with two sub orders, Zygoptera and Anisoptera. They are an amazing insect group with an amphibious life cycle. This makes them an important component of freshwater ecosystems and indicators of ecosystem health. The present study was an attempt made to document and analyse the odonate diversity of College of Forestry Sirsi campus, a 14-ha site in Sirsi, Karnataka, India. The study was done in the field where individual observations were identified and recorded with the help of appropriate field guides. A total of 32 odonate species, i.e., 22 dragonflies and 10 damselflies belonging to 7 families were observed in the study area. Within this diversity, a higher proportion of families Libellulidae and Coenagrionidae within orders Anisoptera and Zygoptera respectively was found. This presence of generalists more than specialists might be due to higher proportion of anthropogenic disturbances in the study site.
Odonates from Bodoquena Plateau: checklist and information about endangered species
Biota Neotropica, 2017
Here we provide an updated checklist of the odonates from Bodoquena Plateau, Mato Grosso do Sul state, Brazil. We registered 111 species from the region. The families with the highest number of species were Libellulidae (50 species), Coenagrionidae (43 species) and Gomphidae (12 species). 35 species are registered in the IUCN Red List species, four being Data Deficient, 29 of Least Concern and two species being in the threatened category. Phyllogomphoides suspectus Belle, 1994 (Odonata: Gomphidae) was registered for the first time in the state.
Diversity and distribution of odonates in Rani Reserve Forest, Assam, India
Journal of Threatened Taxa
Odonata are the bioindicators of freshwater ecosystem health and is recognised as an excellent ‘flagship’ group among insects. Baseline knowledge on the diversity and distribution of odonates over spatiotemporal scale is the key to biodiversity conservation. Rani Reserve Forest of Assam is a mosaic of all the habitat types suitable for odonates. The present work aims at studying the diversity and distribution of Odonates in Rani Reserve Forest. The study was carried out from December 2014 to November 2017 by categorising the study area into three major habitat types: 1. lentic system, 2. lotic system and 3. terrestrial woodland. A total of 67 species belonging to 44 genera, representing 11 families were recorded. First published records of three species, Onychothemis testacea (Libellulidae), Philoganga montana (Philogangidae) and Indocnemis orang (Platycnemididae) from the state are also provided herewith. Species richness was the highest in lentic system whereas recorded the ...
Odonate diversity along different habitats of Koraput district, Odisha, India
Odonates are considered to be indicator of ecological balance. An inventory was carried out to document the over looked odonate diversity in four habitat types (hill stream, river, reservoir and pond) of Koraput district, southern Odisha, India. The study recorded 64 species representing 45 genera under 9 families. Family Libellulidae was the dominant group representing 32 species. Maximum species (n=58, 90.6%) were recorded along hill streams. Forty-one species were recorded from single habitat type, of which 37 species were confined to hill streams. A decreasing trend in species diversity was observed from the water bodies in the forested areas to human dominated landscapes indicating human impact on odonate species diversity. Ditch Jewel (Brachythemis contaminate) was most frequently sighted in the water bodies near human habitations, indicating highly polluted water not suitable for human consumption, whereas species like Common Clubtail (Ictinogomphus rapax) and Common Hooktail (Paragomphus lineatus) were only recorded along hill streams, indicating unpolluted water.