I would like to assess a freshwater ecosystem health using faunal diversity of immature and adult dragonflies and damselflies. Please be informed that the study will be carried out in Bangladesh (Indian subcontinent).
For identifying adult odonates I usually follow the keys of "The Fauna Of British India, including Ceylon and Burma. Volume I-III by Fraser, F. C. 1936." For identifying immature odonate niads you could take the help of "Dragonfly larvae (Odonata): A guide to the identification of larvae of Australian families and identification and ecology of larvae of New South Wales. Identification Guide No. 24, Cooperative research center or freshwater Ecology, Albury' and also "Freshwater Biology by Ward, H.B. and Whipple, G.C. 1959 John Wiley and Sons, New York, London." And for assessing the health of the freshwater ecosystem you have to use biotic index method and for such you could see "Hilsenhoff, W.L. 1988. Rapid Field Assessment of Organic Pollution with a family level Biotic Index. In Journal of North American Benthological Society 7: 65-68."
Depends very much on the region in which you wish to study dragonflies.
As your study area is Bangladesh, so for adult identification of the odonates you better follow the identification keys given by Fraser, F.C. (1936) in Fauna of British India (Odonata). For the immature odonates you could see 'Freshwater Biology " by Ward, H.B. and Whipple, G.C. (1959) and also 'A guide to the study of Freshwater Biology' by Needham, J.G. and Needham, R.P. (1962).
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