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.

Laying Asynchrony in Gentoo Penguins on Crozet Islands: Causes and Consequences

C. A. Bost and P. Jouventin
Ornis Scandinavica (Scandinavian Journal of Ornithology)
Vol. 21, No. 1 (Mar., 1990), pp. 63-70
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3676380
Stable URL: http://www.jstor.org/stable/3676380
Page Count: 8
  • Read Online (Free)
  • 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.
Laying Asynchrony in Gentoo Penguins on Crozet Islands: Causes and Consequences
Preview not available

Abstract

In contrast to the majority of sub-Antarctic species, the Gentoo Penguin Pygoscelis papua has a long laying season, especially in the Crozet archipelago. A 3-year study at this locality has provided the first detailed analysis of laying patterns and inter-annual variations in its breeding. Unusually large variations in the timing of breeding may be related to food shortage early in the breeding season. The capacity of this penguin to overcome reproductive failure by relaying seems to be the major factor responsible for the extended laying season. Relaying was, however, associated with a cost; birds breeding late in one year often either did not breed or had their breeding delayed in the following year. Delayed laying in the Gentoo Penguin is unexpected for a bird of smaller size and shorter breeding cycle than larger seabirds such as albatrosses and King Penguins Aptenodytes patagonicus that also exhibit this phenomenon. In this northernmost locality for the Gentoos, delayed laying seems to be linked to its difficult reproduction in a limited inshore feeding-niche.

Page Thumbnails

  • Thumbnail: Page 
63
    63
  • Thumbnail: Page 
64
    64
  • Thumbnail: Page 
65
    65
  • Thumbnail: Page 
66
    66
  • Thumbnail: Page 
67
    67
  • Thumbnail: Page 
68
    68
  • Thumbnail: Page 
69
    69
  • Thumbnail: Page 
70
    70