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

Body Size, Activity Budgets, and Diets of Sea Ducks Wintering in Newfoundland

R. I. Goudie and C. D. Ankney
Ecology
Vol. 67, No. 6 (Dec., 1986), pp. 1475-1482
Published by: Wiley
DOI: 10.2307/1939078
Stable URL: http://www.jstor.org/stable/1939078
Page Count: 8
  • Download ($42.00)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Body Size, Activity Budgets, and Diets of Sea Ducks Wintering in Newfoundland
Preview not available

Abstract

Morphology, diets, and activity budgets of four co-existing sea ducks, Harlequin Ducks, (Histrionicus histrionicus), Oldsquaws (Clangula hyemalis), Black Scoters (Melanitta nigra), and Common Eiders (Somateria mollissima), were studied during the fall and winter of 1983-1984 at Cape St. Mary's, Newfoundland. The diets and behavior of these species were related to body size. The smaller species, H. histrionicus and C. hyemalis, had diets with higher energy densities and spent more time feeding than did the larger M. nigra and S. mollissima. Multiple regression models were used to determine how the proportion of time spent feeding varied with five environmental and two temporal variables; we found that the two smaller species showed little flexibility in adjusting their activity budgets. This could become critical to survival of these diurnal feeders during periods of severe winter weather or ice conditions. As suggested by Bergmann in 1847, closely related species, such as these syntopic sea ducks in a harsh marine environment, adjust their behavior and diets to compensate for the thermodynamic differences associated with body size.

Page Thumbnails

  • Thumbnail: Page 
1475
    1475
  • Thumbnail: Page 
1476
    1476
  • Thumbnail: Page 
1477
    1477
  • Thumbnail: Page 
1478
    1478
  • Thumbnail: Page 
1479
    1479
  • Thumbnail: Page 
1480
    1480
  • Thumbnail: Page 
1481
    1481
  • Thumbnail: Page 
1482
    1482