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.

Measurement of Niche Breadth and Overlap: The Colwell-Futuyma Method

Michael D. Sabath and J. Micheal Jones
Ecology
Vol. 54, No. 5 (Sep., 1973), pp. 1143-1147
Published by: Wiley
DOI: 10.2307/1935581
Stable URL: http://www.jstor.org/stable/1935581
Page Count: 5
  • Download ($42.00)
  • Subscribe ($19.50)
  • Cite this Item
Measurement of Niche Breadth and Overlap: The Colwell-Futuyma Method
Preview not available

Abstract

The Colwell-Futuyma niche metrics are examined by means of data on microgeographic distribution of 25 species of drosophilid flies. Niche metrics based on a variety of weighting factors (circular, non-circular, absolute, and relative) are highly positively correlated. Unweighted metrics are highly correlated with all weighted metrics. The niche breadth and overlap values with drosophilids as weighting factors are highly positively correlated to metrics using drosophilids matched with co-occurring plants, even though the weights are slightly negatively correlated. Increasing the number of species in the resource matrix (species X resource states table) decreases the variation in weights of resource states and they approach uniform distinctness. Most drosophilid species are broad niched for all calculation methods used. Samplig error may account for some skewing of breadth values because flies might be attracted into otherwise unfavorable environments by the baits.

Page Thumbnails

  • Thumbnail: Page 
[1143]
    [1143]
  • Thumbnail: Page 
1144
    1144
  • Thumbnail: Page 
1145
    1145
  • Thumbnail: Page 
1146
    1146
  • Thumbnail: Page 
1147
    1147