Environmental Constraints on Evolution in Soay Sheep
Author Information
Author(s): Wilson A. J, Pemberton J. M, Pilkington J. G, Coltman D. W, Mifsud D. V, Clutton-Brock T. H, Kruuk L. E. B
Primary Institution: Institute of Evolutionary Biology, University of Edinburgh
Hypothesis
Does environmental heterogeneity limit phenotypic evolution through effects on heritability or selection, or both simultaneously?
Conclusion
Environmental heterogeneity constrains the evolution of birthweight in Soay sheep by affecting heritable variation and the strength of selection.
Supporting Evidence
- Environmental heterogeneity was shown to induce a negative correlation between selection strength and genetic variance.
- Harsh conditions led to strong selection for increased birthweight but low genetic variance.
- The study analyzed data from a long-term study covering 20 years.
Takeaway
The study shows that the environment can change how animals evolve, making it harder for them to adapt if conditions are not stable.
Methodology
The study used a random regression animal model to analyze birthweight in Soay sheep over 20 years, considering environmental quality.
Limitations
The study's predictions may be cautious due to assumptions of the breeder's equation being violated.
Participant Demographics
Soay sheep population on the Scottish island of Hirta, St. Kilda.
Statistical Information
P-Value
0.15
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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