In most primitive groups, that belong to lower Diptera (Nematocera and Orthorrhapha), the mouthparts are composed of three median and unpaired appendages and two pairs of symmetrical appendages. 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 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. The same general behavioral mechanisms in different species can result in the ingestion of a wide range of food items. They form an important component of the food web. station Different streams will have different balances of these functional feeding groups, which can Diptera, particularly larvae, are frequently identified only to the order level. title = {Diet and functional feeding groups of Chironomidae (Diptera) in the Middle Paraná River floodplain (Argentina)}, journal = {Iheringia. Table 2: Functional feeding groups of macroinvertebrates in Zarin-Gol River. Feeding Group - Predator: Notes - The tolerance value and functional feeding group are quoted for Hexatoma. Hexatoma are common and widespread in North American streams, although they can live in both flowing and still waters. Functional feeding groups Different taxa perform different functions in aquatic systems. Functional feeding groups are a classification approach that is based on behavioral mechanisms of food acquisition rather than taxonomic group. Go to: Adult: Penny Picture structural and functional involvement of clypeolabral region in the mouthparts; development of the hypopharynx. For example, shredders break down leaves that fall into streams while scrapers use primary production. Representatives of every functional feeding group have been reported among the aquatic dipterans. They burrow into sediments where they sprawl and cling. 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). 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. 5.1.4 Level of functional groups and food webs. Keywords: Functional feeding groups, ... and Diptera were the most represented families in the study area. The feeding groups defined by Hövemeyer (1984) can be used in this approach. 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