Journal
AMERICAN NATURALIST
Volume 176, Issue 4, Pages 414-423Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/656267
Keywords
bighorn sheep ewe; heritability; reproductive effort; life-history traits; parent-offspring conflict; fitness
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Alberta Fish and Wildlife
- Alberta Conservation Association
- Universite de Sherbrooke
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (Quebec)
Ask authors/readers for more resources
Several studies of large mammals report no direct reproductive costs for females. Individual heterogeneity may hide fitness costs of reproduction, but mothers could also transfer some costs to their offspring. Using data on 442 lambs weaned by 146 bighorn sheep (Ovis canadensis) ewes at Ram Mountain, Alberta, we studied how reproductive effort varied with environmental and maternal conditions. During summer, lactating ewes should gain enough mass to survive the winter and to support their next gestation, while nursing their current lamb. We measured reproductive effort as summer mass gain by lambs corrected for maternal mass in June and maternal mass gain during summer. Females lowered their reproductive effort when population density increased and if they had weaned a lamb the previous year. A reduction in reproductive effort led to lower winter survival by lambs. Bighorn ewes have a conservative reproductive tactic and always favor their own body condition over that of their lambs. When resources are limited, ewes appear to transfer reproductive costs to their lambs, as expected from the much greater relative fitness consequences of a reduction in maternal than in offspring survival.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available