Evol Ecol Res 5: 229-237 (2003) Full PDF if your library subscribes.
Natural selection on individual clutch size–
laying date trends in the Ural owl
Jon E. Brommer,1* Hannu Pietiäinen1 and Heikki Kolunen2
1Bird Ecology Unit, Department of Ecology and Systematics, University of Helsinki, PO Box 65 (Viikinkaari 1), FIN-00014 Helsinki and 2Niikarinkatu 52, FIN-15500 Lahti, Finland
Author to whom all correspondence should be addressed.
Clutch size declines with advancing laying date in many birds. This relationship is thought to represent a reaction norm of individual optimization in response to local environmental conditions. This implies that: (1) individuals should vary in the properties of their clutch size–laying date trends; (2) these differences should be reflected in their fitness; and (3) parts of this variation should be heritable. Here, we show that 44 Ural owl females of known lifespan, with a statistically sufficient number (≥ 5) of clutch size–laying date observations each, differed individually both in the slope and the elevation of their clutch size–laying date relationships. As an estimate of individual fitness, we used the lifetime production of fledglings, which is a known correlate of recruitment in this population. Females with a higher elevation had a higher lifetime reproductive success. However, plasticity – that is, the slope of the clutch size–laying date relationship – did not have apparent advantages in terms of a female’s fitness.
Keywords: clutch size–laying date trend, life history, lifetime reproductive success, phenotypic plasticity, Strix uralensis, Ural owl.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2003 Jon E. Brommer. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.