title: [Distribution and species composition of hyporheic macroinvertebrates in a mountain stream].
abstract: Hyporheic macroinvertebrates are an important component of stream ecosystem. The composition and distribution of the hyporheic macroinvertebrates were investigated using artificial substrates in the upper reaches of Heishuitan River in August, December 2013 and April 2014. The results indicated that a total of 27 microinvertbrate species were identified in all three seasons. In summer, 22 species were identified, accounting for 81.8% of aquatic insects. 16 species were identified both in winter and spring, accounting for 75.0% and 62.5% of aquatic insects, respectively. The density of macroinvertebrate assemblage was significantly lower in summer than in winter and spring, and was the highest in spring. The biomass of macroinvertebrate assemblage was significantly higher in winter than in summer and spring, and was the lowest in summer. Species richness, Shannon index and Pielou index all had no significant difference among the three seasons. The density and richness of macroinvertebrates decreased with bed depth, and the maximum invertebrate density was found within the top 20 cm of the stream bed. Collector-filterer and collector-gatherer were the dominant functional feeding group in all three seasons. The community structure and temporal-spatial distribution of macroinvertebrates were determined by interactions and life history strategy of macroinvertebrates, and physical-chemical factors of hyporheic zone.
authors.forename: Yue-wei
authors.initials: YW
authors.lastname: Zhang
authors.forename: Xing-zhong
authors.initials: XZ
authors.lastname: Yuan
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Hai-qing
authors.initials: HQ
authors.lastname: Ren
authors.forename: Wei
authors.initials: W
authors.lastname: Deng
authors.forename: Xiao-feng
authors.initials: XF
authors.lastname: Wang
mesh_terms: D000818:Animals; D018533:Biomass; D058448:Biota; D002681:China; D017753:Ecosystem; D007313:Insecta; D007448:Invertebrates; D045483:Rivers; D012621:Seasons