Oecologia

, Volume 139, Issue 3, pp 354–358

Supplementary fed Ural owls increase their reproductive output with a one year time lag

  • Jon E. Brommer
  • Patrik Karell
  • Hannu Pietiäinen
Population Ecology

DOI: 10.1007/s00442-004-1528-0

Cite this article as:
Brommer, J.E., Karell, P. & Pietiäinen, H. Oecologia (2004) 139: 354. doi:10.1007/s00442-004-1528-0

Abstract

Life-history components may be food-limited. We supplemented food to 18 Ural owl, Strix uralensis, nests during the nestling period. Food supplementation led to a higher somatic condition in the female parent, but effects in males were moderate. Parents delivered less food to fed nests than to control nests. Offspring survival and fledging condition did not differ between control and fed nests. In the season following food supplementation, fed pairs bred 1 week earlier than control pairs and, coupled to this advance in laying date, fed pairs produced 0.6 eggs more than control pairs. This is the first evidence that food limitation in the current season may constrain next season’s reproduction. Such carry-over effects of food-limitation may have important consequences for population dynamics.

Keywords

Carry-over effect Clutch size – laying date relationship Food limitation Residual reproductive value Ural owl 

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Jon E. Brommer
    • 1
  • Patrik Karell
    • 1
  • Hannu Pietiäinen
    • 1
  1. 1.Bird Ecology Unit, Department of Biological and Environmental SciencesUniversity of HelsinkiFinland

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