How fine sediment in riverbeds impairs growth and survival of juvenile salmonids

Kenwyn B. Suttle, Mary E. Power, Jonathan M. Levine, Camille McNeely

Research output: Contribution to journalArticle

151 Scopus citations

Abstract

Although excessive loading of fine sediments into rivers is well known to degrade salmonid spawning habitat, its effects on rearing juveniles have been unclear. We experimentally manipulated fine bed sediment in a northern California river and examined responses of juvenile salmonids and the food webs supporting them. Increasing concentrations of deposited fine sediment decreased growth and survival of juvenile steelhead trout. These declines were associated with a shift in invertebrates toward burrowing taxa unavailable as prey and with increased steelhead activity and injury at higher levels of fine sediment. The linear relationship between deposited fine sediment and juvenile steelhead growth suggests that there is no threshold below which exacerbation of fine-sediment delivery and storage in gravel bedded rivers will be harmless, but also that any reduction could produce immediate benefits for salmonid restoration.

Original languageEnglish (US)
Pages (from-to)969-974
Number of pages6
JournalEcological Applications
Volume14
Issue number4
DOIs
StatePublished - Aug 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology

Keywords

  • Fine sediment
  • Oncorhynchus mykiss
  • Pacific salmonids
  • Parr
  • River food web
  • Sedimentation
  • Steelhead trout

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