title: Longitudinal Distribution of the Functional Feeding Groups of Aquatic Insects in Streams of the Brazilian Cerrado Savanna.
abstract: We demonstrate that the distribution of the functional feeding groups of aquatic insects is related to hierarchical patch dynamics. Patches are sites with unique environmental and functional characteristics that are discontinuously distributed in time and space within a lotic system. This distribution predicts that the occurrence of species will be based predominantly on their environmental requirements. We sampled three streams within the same drainage basin in the Brazilian Cerrado savanna, focusing on waterfalls and associated habitats (upstream, downstream), representing different functional zones. We collected 2,636 specimens representing six functional feeding groups (FFGs): brushers, collector-gatherers, collector-filterers, shredders, predators, and scrapers. The frequency of occurrence of these groups varied significantly among environments. This variation appeared to be related to the distinct characteristics of the different habitat patches, which led us to infer that the hierarchical patch dynamics model can best explain the distribution of functional feeding groups in minor lotic environments, such as waterfalls.
authors.affiliation: Depto de Ciências Biológicas, Univ do Estado de Mato Grosso-UNEMAT, CP 8, 78690-000, Nova Xavantina, MT, Brasil. brasil_biologia@hotmail.com.
authors.forename: L S
authors.initials: LS
authors.lastname: Brasil
authors.affiliation: Lab de Ecologia e Conservação, Instituto de Ciências Biológicas, Univ Federal do Pará, Belém, PA, Brasil.
authors.forename: L
authors.initials: L
authors.lastname: Juen
authors.affiliation: Depto de Ciências Biológicas, Univ do Estado de Mato Grosso-UNEMAT, CP 8, 78690-000, Nova Xavantina, MT, Brasil.
authors.forename: J D
authors.initials: JD
authors.lastname: Batista
authors.affiliation: Depto de Ciências Biológicas, Univ do Estado de Mato Grosso-UNEMAT, CP 8, 78690-000, Nova Xavantina, MT, Brasil.
authors.forename: M G
authors.initials: MG
authors.lastname: Pavan
authors.affiliation: Depto de Ciências Biológicas, Univ do Estado de Mato Grosso-UNEMAT, CP 8, 78690-000, Nova Xavantina, MT, Brasil.
authors.forename: H S R
authors.initials: HS
authors.lastname: Cabette
mesh_terms: D063147:Animal Distribution; D000818:Animals; D059001:Aquatic Organisms; D044822:Biodiversity; D001938:Brazil; D017753:Ecosystem; D065948:Grassland; D007313:Insecta
keywords: EPT; hierarchical patch dynamics; lotic; trophic groups; waterfall