Effects of flow and fine sediment dynamics on spatial and temporal turnover of stream invertebrate assemblages

Cristina Buendia, Chris N. Gibbins, Damia Vericat, Ramon J. Batalla

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Interactions between flow regime, sediment dynamics and benthic invertebrates have seldom been studied in rivers experiencing naturally high suspended sediment loads. This paper examines invertebrate responses to hydrological and sedimentary processes over an annual cycle in a morphologically heterogeneous reach of a river that receives large volumes of fine sediment. Flow regime and sedimentary conditions showed a marked seasonal pattern, with fine sediment accumulating during low flows and after small flood events and not being removed until the large floods that occurred in autumn. The magnitude of sediment accumulation differed between habitats (e.g. being greater in pools than in riffles). The turnover in invertebrate assemblages, measured as beta diversity, was greatest in winter and decreased during summer as deposited fine sediment accumulated across the reach, suggesting that observed patterns of turnover were influenced by seasonal and habitat-specific rates of sedimentation. Some of the spatial and temporal patterns in invertebrate assemblages were subtle, complex and difficult to interpret, but co-inertia analysis indicated an overriding influence of low flows and associated sedimentation on their composition. Floods capable of entraining coarser bed material, along with smaller events accompanied by extensive mobilization of fine sediment, also influenced assemblages and resulted in immediate changes to assemblage composition and abundance. Assemblages appeared to exhibit resilience over the timescale of the study, with similar assemblages found at the beginning and at the end of the study period. Copyright © 2013 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)1105-1123
Number of pages19
JournalEcohydrology
Volume7
Issue number4
Early online date15 Nov 2013
DOIs
Publication statusPublished - Aug 2014

Fingerprint

turnover
invertebrate
invertebrates
sediments
sediment
low flow
sedimentation
rivers
riffle
habitat
habitats
river
inertia
annual cycle
suspended sediment
mobilization
effect
seasonal variation
autumn
timescale

Keywords

  • fine sediment
  • beta-diversity
  • floods
  • low flows

Cite this

Effects of flow and fine sediment dynamics on spatial and temporal turnover of stream invertebrate assemblages. / Buendia, Cristina; Gibbins, Chris N.; Vericat, Damia; Batalla, Ramon J.

In: Ecohydrology, Vol. 7, No. 4, 08.2014, p. 1105-1123.

Research output: Contribution to journalArticle

Buendia, Cristina ; Gibbins, Chris N. ; Vericat, Damia ; Batalla, Ramon J. / Effects of flow and fine sediment dynamics on spatial and temporal turnover of stream invertebrate assemblages. In: Ecohydrology. 2014 ; Vol. 7, No. 4. pp. 1105-1123.
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