Direct and indirect effects of early-life environment on lifetime fitness of bighorn ewes.

ABSTRACT: Cohort effects, when a common environment affects long-term performance, can have a major impact on population dynamics. Very few studies of wild animals have obtained the necessary data to study the mechanisms leading to cohort effects. We exploited 42 years of individual-based data on bighorn sheep to test for causal links between birth density, body mass, age at first reproduction (AFR), longevity and lifetime reproductive success (LRS) using path analysis. Specifically, we investigated whether the effect of early-life environment on lifetime fitness was the result of indirect effects through body mass or direct effects of early-life environment on fitness. Additionally, we evaluated whether the effects of early-life environment were dependant on the environment experienced during adult

SUBMITTER: Pigeon G 

PROVIDER: S-EPMC5784190 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature