Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Detritus Processing, Ecosystem Engineering and Benthic Diversity: A Test of Predator-Omnivore Interference

Yixin Zhang, John S. Richardson and Junjiro N. Negishi
Journal of Animal Ecology
Vol. 73, No. 4 (Jul., 2004), pp. 756-766
Stable URL: http://www.jstor.org/stable/3505284
Page Count: 11
  • Read Online (Free)
  • Download ($18.00)
  • Subscribe ($19.50)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Detritus Processing, Ecosystem Engineering and Benthic Diversity: A Test of Predator-Omnivore Interference
Preview not available

Abstract

1. Interference between species from different functional groups may influence ecosystem functioning and biological diversity. This study tested whether interactions between predacious cutthroat trout and an omnivorous signal crayfish modified the crayfish's trophic and engineering effects within a detrital-based, stream benthic community. 2. We show in a trough experiment that omnivorous crayfish through their trophic and engineering roles enhance detritus decomposition, reduce particulate organic matter (POM) accumulation, and diminish diversity in leaf packs. 3. In crayfish troughs by day 30, leaf dry weight loss was 1·8-fold greater, whereas POM trapped in leaf packs was 80% less, than of those in controls, and the abundance, biomass and taxon richness of benthos in leaf packs were lower than those in controls. Predatory cutthroat trout did not affect those variables and did not interfere with the crayfish. 4. Crayfish and cutthroat trout both decreased fine material sedimentation in the troughs. 5. Thus, with no interference from cutthroat trout, the signal crayfish acted as ecosystem processors and engineers, and strongly influenced detrital processing, benthic diversity, and the accumulation of POM and fine sediments.

Page Thumbnails

  • Thumbnail: Page 
[756]
    [756]
  • Thumbnail: Page 
757
    757
  • Thumbnail: Page 
758
    758
  • Thumbnail: Page 
759
    759
  • Thumbnail: Page 
760
    760
  • Thumbnail: Page 
761
    761
  • Thumbnail: Page 
762
    762
  • Thumbnail: Page 
763
    763
  • Thumbnail: Page 
764
    764
  • Thumbnail: Page 
765
    765
  • Thumbnail: Page 
766
    766