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

Economics of Feeding Territoriality in the Golden-Winged Sunbird

Frank B. Gill and Larry L. Wolf
Ecology
Vol. 56, No. 2 (Early Spring, 1975), pp. 333-345
Published by: Wiley
DOI: 10.2307/1934964
Stable URL: http://www.jstor.org/stable/1934964
Page Count: 13
  • Download ($42.00)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Economics of Feeding Territoriality in the Golden-Winged Sunbird
Preview not available

Abstract

Feeding territories of Golden-winged Sunbirds contain enough energy to support an individual's daily energy requirements, and the amount of nectar per flower inside a territory tends to average higher than in adjacent undefended flowers. When undefended nectar levels are low (especially below 2 @ml per flower) the costs of territorial defense can easily be offset by energy saved from shortened foraging time budgets made possible by feeding at the higher average nectar levels. At higher undefended nectar levels the costs of territorial defense should no be recoverable. The balance between these costs and gains appears to define the conditions when territorial defense in this species is advantageous.

Page Thumbnails

  • Thumbnail: Page 
333
    333
  • Thumbnail: Page 
334
    334
  • Thumbnail: Page 
335
    335
  • Thumbnail: Page 
336
    336
  • Thumbnail: Page 
337
    337
  • Thumbnail: Page 
338
    338
  • Thumbnail: Page 
339
    339
  • Thumbnail: Page 
340
    340
  • Thumbnail: Page 
341
    341
  • Thumbnail: Page 
342
    342
  • Thumbnail: Page 
343
    343
  • Thumbnail: Page 
344
    344
  • Thumbnail: Page 
345
    345