Variation in phenotypic plasticity and selection patterns in blue tit breeding time: between- and within-population
Melody Porlier1, Anne Charmantier, Patrice Bourgault
1Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada. melody.porlier@usherbrooke.ca
The Journal of Animal Ecology
|May 10, 2012
Summary
Phenotypic plasticity allows organisms to adapt to changing environments. Blue tits show varied breeding time adjustments, with less plasticity in unpredictable habitats, challenging broad generalizations.
Area of Science:
- Evolutionary biology
- Behavioral ecology
- Ornithology
Background:
- Phenotypic plasticity enables organisms to cope with environmental variability.
- Individual variation in plasticity exists but is poorly understood across populations.
- Breeding timing in birds is a crucial fitness trait influenced by environment.
Purpose of the Study:
- Investigate population and individual variation in breeding time plasticity in blue tits (Cyanistes caeruleus).
- Examine selection patterns on breeding time across different Mediterranean habitats.
- Understand the causes and extent of plasticity variation within a species.
Main Methods:
- Studied four Mediterranean blue tit populations with varying habitat structure and quality.
- Analyzed breeding time, phenotypic plasticity, and selection patterns.
- Assessed inter-individual variation in plasticity for laying date.
Main Results:
- Earlier breeding observed in warmer years across all populations, with reduced plasticity in less predictable environments.
- Significant inter-individual variation in plasticity found in two of four populations.
- Selection for earlier laying was significant only in populations lacking inter-individual plasticity variation.
Conclusions:
- Plasticity patterns can vary significantly between populations, even at small spatial scales.
- Within-individual variation in phenotypic plasticity may be influenced by selective pressures.
- Generalizing plasticity patterns across populations of the same species is challenging.
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