The study of Odonata communities along wetlands requires the basic understanding of the abundance, distribution and number of species present. As habitat conditions change, they also exhibit changes in their diversity and distribution. Odonata assemblages were surveyed along the Densu River at Atewa Range Forest Reserve (ARFR) and Nsawam in the Eastern Region of Ghana and Weija in the Greater Accra Region of Ghana. Of the 177 species recorded for Ghana, 66 species (43 dragonfly and 23 damselfly species) were sampled along the Densu River. These belonged to eight families of which the Libellulidae dominated. The distribution of species was significantly different between the sites with the most diverse area being ARFR with 47 species. The various environmental variables along the river were recorded and their effects discussed.

	 Key words: Atewa range

https://www.academicjournals.org/article/article1381826382_Acquah - Lamptey et al.pdf

Using odonates as markers of the environmental health of water and its land related ecotone

The Odonata is important in identifying the habitat health of freshwater ecosystems. In this study, the species richness and relative abundance of Odonata were determined in 12 sampling sites in Zamboanga del Sur. Field work was conducted in August-December, 2012 using the random sampling method. Thirty-six species belonging to 10 families were documented of which 16 (44%) species are Philippine endemic. High species richness was recorded in Cabilinan Stream which is considered to be the most undisturbed site in the 12 sampling sites. Species richness was also considerably high in eight sampling sites despite habitat modification and water pollution from agricultural run-offs. The presence of Oriental species which are indicators of degraded environments suggests that the streams are disturbed. However, the presence of some endemic species indicates that these endemic fauna can thrive in disturbed habitats.

Species richness of Odonata in selected freshwater systems in Zamboanga del Sur, Philippines.

This paper reports a pioneer study dealing with the impact of dam construction on Odonata communities, because no similar study has been undertaken in Algeria and the consequences of this artificialization on the Odonata assemblages have rarely been studied elsewhere. The main purpose of this study was to determine if the Tichi Haf dam is really having a negative effect on the Odonata communities living on the Boussellam watercourse, as there has hitherto been a lack of knowledge about its odonatofauna and aquatic microinvertebrates. This study showed that changes due to the construction of this dam, involving riparian vegetation, bank aspect and water parameters, affected the Odonata assemblages inhabiting both sides of the dam wall. The richness and abundance of dragonflies and damselflies found upstream from the dam is quite different from those found downstream from the dam. The survey also identified four new species for the Bejaia region. Among these, we report on the rediscovery of the critically endangered (EN) Calopteryx exul in Algeria, recorded in the nineteenth century and deemed to have been extinct after an absence of more than a century. The presence of an extant population C. exul in this location does not correspond to any historical locality reported for this species.

/pdf/does-the-tichi-haf-dam-construction-affect-dragonfly-and-4tyuda7h10.pdf

Does the Tichi Haf dam construction affect dragonfly and damselfly (Odonata : Insecta) assemblages of the Boussellam watercourse (central north Algeria)? A preliminary study

Mosquito control is essential for the control of vector borne diseases. Many synthetic insecticides are widely used for controlling adult and larval mosquito populations. However, there are multirole effects: e.g. the harmful effects of chemicals on non-target organisms, the development of resistance to these chemicals in mosquitoes and the recent resurgence of different mosquito-borne diseases. The objectives of this study are to determine the potential breeding habitats of the mosquitoes, mosquito indices, mosquito species, density of mosquito larvae, perceptions of respondents on bio control and to conduct captivity studies on predator–prey relationships. Entomological surveillance was carried out in six localities in the urban and suburban areas from January until December 2010 to identify potential breeding sites for mosquitoes and mosquito species populations. A total of 442 representative households in six localities were selected. Breeding habitats were sampled outdoors in the surroundings of the housing areas. There was a significant difference in the number of mosquito larvae collected, where the urban areas had a higher density in contrast to suburban areas. The study indicated that the most predominant species found in both areas was Aedes albopictus with gardening utensils as a preferred breeding habitat for urban area and artificial containers for suburban area. Entomological indices were calculated to predict future outbreaks in the localities. Ovitrap surveillance was carried out in one year to study the relationship between ovitrap surveillance and environmental parameters, which revealed no significant difference in the population numbers for both areas and no correlation to the environmental factors. Questionnaires on the perceptions of chemical in mosquito control and the potential use of bio control were distributed to staffs in health office and also public in both study areas. In general the public had high uncertainties (scoring on ‘not sure’ for all the 4 questions given ranging from 47.9% to 27%. This is due to the public being unfamiliar to bio control as indicated in question 1 (56%) in contrast to staff very aware on bio control (75%). Fatigue was the
iv
most frequently reported symptom by staff and breathing difficulty reported by public. Natural bio control agent surveillance was conducted in both study areas. Poecilicia reticulata and Odonata nymph species was the most natural predator collected at study areas. Three species of Odonata nymphs consumed more Aedes species than Culex species but there was no significant difference in the predator feeding efficiency. In terms of prey preferences of guppy, both male and female consumed more Aedes species than Culex species. The behaviour of mosquito larvae species and predator (guppy and Odonata nymph) species showed direct influence on the predatory activities. All predators exhibited diurnal activities; they were day-time stalkers and actively consumed more mosquito larvae during the day time. The efficiency of predatory activities depends on several factors such as water volume, number of predator, and number of prey density. These results concluded that both common biocontrol agent (guppies) and potential biocontrol agent (Odonata nymphs) are efficient predators in laboratory experiment and thus likely candidates to be utilized as an environmental friendly mosquito management strategy.

Studies of breeding habitats and seasonal occurrence of mosquitoes in Putrajaya and Kuala Selangor, with laboratory experiments of guppies and dragonfly nymphs as potential biocontrol predators against mosquito larvae / Siti Nurhafizah Saleeza Ramlee

Odonata is one of the most predominant natural enemy of the rice ecosystems and their diversity in rice fields from different parts of Tamil Nadu viz., Coimbatore, Aduthurai, Pudukkottai, Ramanathapuram, Bhavanisagar and Gudalur was studied. The Odonata assemblage comprised 21 species under 19 genera under 4 families. Anisoptera (dragonflies) were dominant with 15 species and 14 genera over Zygoptera (damselflies) (6 species, 5 genera). Libellulidae (Anisoptera) was the most speciose family with 14 species followed by Coenagrionidae (Zygoptera) with 5 species. Diversity analysis of Odonata from rice fields of Tamil Nadu revealed that the order of Simpson Diversity index (SID) of diversity was Coimbatore (0.89) > Bhavanisagar (0.88) > Aduthurai (0.87) > Ramanathapuram (0.87) > Gudalur (0.84) > Pudukottai (0.82). Margalef index (α) of species richness were high in Coimbatore (2.33) and least in Gudalur (1.55). Eveness of species within the region (Pielou`s evenness index, E1) was the highest for Bhavanisagar (0.94) and the lowest for Aduthurai (0.84). Among the different regions, Odonata in rice fields of the Coimbatore and Aduthurai were found to have a maximum similarity.

https://www.entomoljournal.com/archives/2020/vol8issue5/PartAC/8-5-271-286.pdf

Diversity of Odonata in the rice fields of Tamil Nadu

Odonata diversity was assessed in 13 temporary water bodies of Coimbatore and Salem districts in Tamil Nadu. Assessment revealed the presence of 21 species of Odonata (14 species of Anisoptera and seven species of Zygoptera) belonging to 17 genera under four families. Libellulidae (Anisoptera) was represented by the maximum number of species and individuals. Pantala flavescens (Libellulidae) was the most abundant among 21 species. Among the temporary water bodies, the maximum number of individuals as well as species was recorded from Utkulam tank (Coimbatore district). Odonata diversity was higher in Kamalapuram tanks 1 and 2 (Salem district) and lower in Ukkadam tank (Coimbatore District). Diplacodes trivialis (Rambur), Orthetrum sabina (Drury) and Pantala flavescens (Fabricius) were identified as temporary water body specialists because of their presence in all the 13 temporary water bodies sampled.

/pdf/abundance-and-diversity-of-odonata-in-temporary-water-bodies-21txhrd5ht.pdf

Abundance and diversity of Odonata in temporary water bodies of Coimbatore and Salem districts in Tamil Nadu

Odonata diversity assessed in the rice fields of five major rice growing areas of Pattukkottai in Tamil Nadu viz., Agricultural Research Station (ARS) Farm, Pattukkottai, Anaikadu (ANA), Pokirikadu (POK), Ponnavarayankottai (PON) and Palanchur (PAL) revealed the occurrence of 19 species. These belong to 16 genera under 3 families viz., Libellulidae (12 species), Coenagrionidae (6 species) and Lestidae (1 species). Maximum Odonata abundance, species richness, diversity and evenness was found in the ARS and only 10–15% variation in species composition was found. Diplacodes trivialis (Rambur), Pantala flavescens (Fabricius), Orthetrum sabina (Drury), Crocothemis servilia (Drury), Trithemis pallidinervis (Kirby), Ischnura aurora (Brauer) and Agriocnemis pygmaea (Rambur) were the abundant ones.

Biodiversity of Odonata in rice at Pattukkottai in Tamil Nadu

Odonata is one of the most important predators in the rice ecosystems and their occurrence in rice fields from different parts India was inventoried. Odonata diversity in the rice fields from India comprised of 127 species under 71 genera of 13 families. Anisoptera (Dragonflies) were dominant with 81 species and 52 genera under six families over Zygoptera (Damselflies) (46 species, 19 genera under 7 families). Libellulidae (Anisoptera) was the most speciose family with 53 species and 32 genera followed by Coenagrionidae (Zygoptera) with 27 species and 7 genera. Orthetrum sabina (Drury, 1770) (Libellulidae) was observed to occur in all the rice fields studied across the country. Analysis of Odonata from rice fields in different biogeographical regions of India revealed that the order of dominance of species was: Gangetic Plain Zone (76 species) > Western Ghat Zone (57 species) > Deccan Plateau Zone (54 species) > Semi Arid Zone (39 species) > Northeast Zone (14 species) > Coastal Zone (10 species) > Himalayan Zone (1 species). Odonata in rice fields of the Western Ghat Zone and Deccan Plateau Zone were found to have a maximum of 50.48% similarity.

Checklist of odonata in the rice fields of India

A study was designed to ascertain the impact of agrochemicals on the biodiversity of Odonata in rice fields at a Wetland farm. Adult Odonata diversity was assessed at weekly intervals from two rice fields, one with normal application of agrochemicals and other without any agrochemicals application (control). Eighteen and ten species of Odonata were recorded in Control Rice Field (CRF) and Agrochemicals Applied Rice Field (AARF), respectively. Odonata abundance, diversity and species richness was higher in CRF than AARF. Among the different stages of the rice crop, active tillering stage had Maximum abundance, diversity and species richness of Odonata. Among the families, Libellulidae was dominant in both CRF and AARF. Among the species, Diplacodes trivialis (Rambur) and Pantalaflavescens (Fabricius) (Anisoptera) were dominant in CRF and AARF, respectively and Ischnura aurora (Brauer) (Zygoptera) was abundant in both CRF and AARF. Eight species of Odonata, which were present in CRF and absent in AARF, may be identified as indicator Odonata species for agrochemicals contamination in rice ecosystem.

Impact of Agrochemicals on the Abundance and Diversity of Odonata In Rice Fields

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