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 Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Food-Web Patterns: Lessons from a Species-Rich Web

S.J. Hall and D. Raffaelli
Journal of Animal Ecology
Vol. 60, No. 3 (Oct., 1991), pp. 823-841
DOI: 10.2307/5416
Stable URL: http://www.jstor.org/stable/5416
Page Count: 19
  • Read Online (Free)
  • Download ($18.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Food-Web Patterns: Lessons from a Species-Rich Web
Preview not available

Abstract

(1) The properties of a large and well-documented estuarine food web are examined to see how closely they conform to the patterns described for food webs in general. Average food-chain lengths are longer and the degree of omnivory is higher than for the majority of published webs. The web is similar to others in the proportions of top, intermediate and basal species and the links between them, and in the relationships between the number of trophic links and web size and between the number of predators and the number of prey. (2) The effects of taxonomic resolution on web properties are examined by progressively aggregating web elements into coarser taxonomic classes. Aggregation resulted in a marked reduction in average food-chain length and reproduced the relationship between the number of trophic links and the number of species and between the number of predators and the number of prey. The proportions of top, intermediate and basal species and the proportions of links between these groupings were insensitive to our aggregation procedure.

Page Thumbnails

  • Thumbnail: Page 
823
    823
  • Thumbnail: Page 
824
    824
  • Thumbnail: Page 
825
    825
  • Thumbnail: Page 
826
    826
  • Thumbnail: Page 
827
    827
  • Thumbnail: Page 
828
    828
  • Thumbnail: Page 
829
    829
  • Thumbnail: Page 
830
    830
  • Thumbnail: Page 
831
    831
  • Thumbnail: Page 
832
    832
  • Thumbnail: Page 
833
    833
  • Thumbnail: Page 
834
    834
  • Thumbnail: Page 
835
    835
  • Thumbnail: Page 
836
    836
  • Thumbnail: Page 
837
    837
  • Thumbnail: Page 
838
    838
  • Thumbnail: Page 
839
    839
  • Thumbnail: Page 
840
    840
  • Thumbnail: Page 
841
    841