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<br />73
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<br />Functional Feeding Group Concept:.
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<br />The functional feeding group concept h based on the trophic ecology
<br />of immature and adult stages of aquatic insects durinlt the aquatic phase of
<br />their life cycle (Cummins 1973, 1975). Organisms are categorized on the
<br />basis of specific morpho-behavioral adaptations for acquiring food such as
<br />chewing, filtering, scraping (grazing), piercing and sucking or consuming
<br />whole or parts of animals (predation) and not on the type of food eaten. A
<br />general classification system has been devised that defines six functional
<br />feeding groups (shredders, collectors, scrapers, predcLtors, pierc1. rs, and
<br />parasites) based on feeding mechanism, domh1ant food type consumed and
<br />detrital particle size categories (Table 2, Cumlllins 1 SI78). Food resources
<br />are partitioned on the basis of particle si:~e and on ~rhether they are in
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<br />suspension, drifting (fine particle detritus and plankton), stationary
<br />(periphyton, vascular plants, deposited detritus), or active (prey).
<br />
<br />Shredde rs
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<br />\ The functional group termed shredders includes those macro-
<br />' invertebrates that are often large and morphologically adapted for chewing,
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