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Mother-offspring interactions affect natal dispersal in a lizard.
Jean-François Le Galliard1, Régis Ferrière, Jean Clobert
1Laboratoire Fonctionnement et Evolution des Systèmes Biologiques, Ecole Normale Supérieure, 46 rue d'Ulm, 75005 Paris, France. galliard@biologie.ens.fr
Proceedings. Biological Sciences
|June 21, 2003
Summary
Parental presence influences offspring dispersal in common lizards (Lacerta vivipara). The study found sex-specific dispersal patterns, with females dispersing more when the mother is present, suggesting kinship influences behavior.
Area of Science:
- Ecology
- Behavioral Ecology
- Evolutionary Biology
Background:
- Dispersal is a key life-history trait influenced by social interactions and kinship.
- Previous correlative studies suggested mother-offspring interactions affect dispersal in the common lizard (Lacerta vivipara).
Purpose of the Study:
- To experimentally investigate the plastic response of natal dispersal to mother-offspring interactions and conspecific density.
- To determine sex-specific dispersal patterns in relation to kinship and density.
Main Methods:
- A factorial experiment was conducted using experimental patches of common lizards.
- Treatments included the presence versus absence of the mother and high versus low patch density.
- Offspring dispersal was monitored at juvenile and yearling stages.
Main Results:
- Offspring dispersal showed sex-dependent responses to the mother's presence at both juvenile and yearling stages.
- Females dispersed more in the presence of the mother at the juvenile stage; responses opposed at the yearling stage.
- Dispersal was negatively related to patch density at the juvenile stage, with no interaction between density and mother presence.
Conclusions:
- Kinship and density-dependent factors appear to influence dispersal independently in common lizards.
- Kinship assessment likely occurs at a small social scale.
- Competition and inbreeding avoidance may explain observed dispersal patterns.