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.

Adaptive Significance of Synchronized Breeding in a Colonial Bird: A New Hypothesis

Stephen T. Emlen and Natalie J. Demong
Science
New Series, Vol. 188, No. 4192 (Jun. 6, 1975), pp. 1029-1031
Stable URL: http://www.jstor.org/stable/1740740
Page Count: 3
  • More info
  • Cite this Item
Adaptive Significance of Synchronized Breeding in a Colonial Bird: A New Hypothesis
Preview not available

Abstract

Bank swallows nest gregariously in colonies usually ranging from 10 to 300 nests. Different pairs within the same colony are highly synchronized with each other, and 67 percent of the nests fledged their young over a period of only 6 days. This high degree of synchronization is demonstrated to be of adaptive significance. Reproductive fitness increases as a function of the precision of synchrony of the colony. It is proposed that social foraging plays an important role in maximizing the feeding efficiency in this species and that asynchronous breeding decreases the effectiveness of this social foraging, particularly in late nesters and among young, newly fledged birds. An individual that fledges either early or at the peak of synchrony will emerge to find a steady stream of other birds traveling to local, ephemeral, concentrations of food. The late emerger finds itself practically alone and thus is deprived of the potential benefits of the pooled information about locations of food resources available to the full colony.

Page Thumbnails

  • Thumbnail: Page 
1029
    1029
  • Thumbnail: Page 
1030
    1030
  • Thumbnail: Page 
1031
    1031