Hexatoma are common and widespread in North American streams, although they can live in both flowing and still waters. Predator mainly Odonata, Hemiptera and Coleoptera was the most common group and found in high densities in Bogak River (modified river) and Kerian River (main river). Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River oodplain (Argentina) M. Celeste Galizzi 1 , Florencia Zilli 2 & Mercedes Marchese 1,2 Functional feeding groups are a classification approach that is based on behavioral mechanisms of food acquisition rather than taxonomic group. Different streams will have different balances of these functional feeding groups, which can They burrow into sediments where they sprawl and cling. Feeding Group - Predator: Notes - The tolerance value and functional feeding group are quoted for Hexatoma. functional feeding groups was discussed regarding the functions of the ecosystem and water quality assessment. The four major functional groups are: Collectors (filtering and gathering) – This group includes organisms that filter small particulate organic matter from the water column. Identification to family or subfamily enables the investigator to specify more precisely their position in food webs. Keywords: Functional feeding groups, ... and Diptera were the most represented families in the study area. They eat oligochaetes and fly larvae. Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River floodplain (Argentina) Dieta y grupos funcionales tróficos de Chironomidae (Diptera) de la llanura aluvial del río Paraná Medio (Argentina) M. Celeste Galizzi I; Florencia Zilli II; Mercedes Marchese I,II Table 2: Functional feeding groups of macroinvertebrates in Zarin-Gol River. For example, shredders break down leaves that fall into streams while scrapers use primary production. The feeding groups defined by Hövemeyer (1984) can be used in this approach. Functional Feeding Groups and the River Continuum In discussing families of insects in previous entries I've mentioned the phrase "Functional Feeding Group" (FFG) on more than one occasion. The same general behavioral mechanisms in different species can result in the ingestion of a wide range of food items. Functional feeding groups Different taxa perform different functions in aquatic systems. They form an important component of the food web. Go to: Adult: Penny Picture functional feeding group (FFG) in Bogak, Kerian and Serdang rivers of Kerian River Basin showed that there were 120 genera from 59 families of 13 orders of macroinvertebrates. structural and functional involvement of clypeolabral region in the mouthparts; development of the hypopharynx. station Representatives of every functional feeding group have been reported among the aquatic dipterans. A functional feeding group refers to the type of food resource that a particular species utilizes in the stream. 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