Abstract
Odonates are valuable as indicators of aquatic and terrestrial ecosystem health and also play a vital role as prey and predator to maintain the balance of trophic levels of food chain. Diversity and distribution of different species of Odonata and physico-chemical properties of water of their habitat in the rural (RA), urban (UA) and tea garden (TG) area of Cachar district of Assam was investigated. A total of fourteen (14) species (larva and adult) were recorded from the three areas. Six species were recorded in RA, four species in TG and six species in UA. Two species Ischnura aurora aurora and Agriocnemis pygmaea pygmaea were recorded common in TG and UA. In TG presence of only two tolerant families indicated that the water quality of the area is polluted. In RA, presence of Aeshnidae indicated relatively better condition of water quality.
Highlights
Fresh water species throughout the world depend on clean, pure and healthy water for their survival. 1 knowledge of freshwater biodiversity is improving 2, large gaps remain, among invertebrates and especially in tropics where data deficient species is greater (50 to 75% data deficient)[3 ]
The adults are terrestrial and larvae are aquatic. They are valuable as indicators of aquatic and terrestrial ecosystem health and play a vital role as prey and predator to maintain the balance of trophic levels of food chain and useful in the control of mosquitoes which pass on diseases to human beings[7]
Invertebrates possess the capacity of responding to environmental perturbation at different levels of organization and serve as bioindicators of pollution25,. 26, . 27,28 For the investigation of the impact of global warming and climate change, order Odonata can be considered as ideal taxa[29,30]
Summary
Fresh water species throughout the world depend on clean, pure and healthy water for their survival. 1 knowledge of freshwater biodiversity is improving 2, large gaps remain, among invertebrates and especially in tropics where data deficient species is greater (50 to 75% data deficient)[3 ]. Odonata species are more sensitive to environmental changes in the water 10. Air temperature (AT) was recorded during for the study have been categorized into three areas collection. As these sites are unique in respect to their environment it is Larvae of Odonata were collected from thought that a wide array of Odonata larvae and adult each site by a circular net (mesh size 60mm) by will be explored from these areas.
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