The Importance Of Biodiversity Insects

Introduction
Biodiversity is the unevenness amongst the species from all sources, including aquatic and terrestrial ecosystems and the ecological complexes of which they are a part. It is essential for stabilization of ecosystem, protection of overall environmental quality for understanding intrinsic worth of all species on the earth. It is the variety of life forms at every level viz. molecular, population, species and ecosystem of natural organization. United Nations Earth Summit (1992) defined biodiversity as, the variability among living organisms from all sources viz. terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are a part (Hawksworth, 1996).
According to Gaston and Spicer, (2004) “Biodiversity

Almost every inland water body whether it is a river, stream, seepage or lake supports a biological community within it (Gullan and Cranston, 2000). Insects are now recognized as important components of biodiversity (Kim, 1993; Kremen et al., 1993; Oliver & Beatlie, 1996; Yen & Butcher, 1997). They play vital roles in processes such as pollination, soil formation and fertility, plant productivity, organic decomposition and the regulation of populations of other organisms through predation and parasitism (Daily et al., 1997; Yen and Butcher, 1997). Insects are also the food source of many vertebrates (Vantomme et al. 2012). They play important roles in nutrient cycling, primary production, decomposition and ma terial translocation. The wider acceptance of insects as indispensable components of biodiversity has led to a rapid increase in broad based surveys and greater pressure to provide information and guidelines for insect conservation and

Only a few species spend their lives uninterruptedly in water. Some live out of water only as pupae. But most pass through all their developmental stages in water and take to the air as adults.
The orders of insects that are almost exclusively aquatic in their immature stages are the Ephemeroptera (may flies), Odonata (damsel flies and dragon flies), Plecoptera (stone flies), and Trichoptera (caddish flies). Amongst the major insect orders a substantial number of Hemiptera, Coleoptera and Diptera have at least some aquatic stages and among the minor orders, Megaloptera and some Neuroptera develop in fresh