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Offspring-driven local dispersal in female sand lizards (Lacerta agilis)


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Ryberg, K, Olsson, M, Wapstra, E, Madsen, T, Anderholm, S and Ujvari, B 2004 , 'Offspring-driven local dispersal in female sand lizards (Lacerta agilis)' , Journal of Evolutionary Biology, vol. 17 , pp. 1215-1220 , doi: 10.1111/j.1420-9101.2004.00798.x.

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We report on a field study in which determinants of female breeding dispersal
(i.e. the shift in the mean home range coordinates between successive
breeding events) was investigated. Offspring were released in full sib groups
(or half sib ones if there was within-clutch multiple paternity) at a separation
distance from the females that varied between ‘families’. This allowed for
analysis of ‘offspring nearness’ effects on maternal dispersal. When a female’s
offspring were released more closely to her, she responded with greater
dispersal. Furthermore, when the data set was truncated at 100 m maternal–
offspring separation distance at offspring release (because perception at longer
distances is likely to be unrealistic), maternal dispersal resulted in greater
separation distance between female and offspring in the following year.
A corresponding analysis for juveniles revealed no effect of maternal nearness
on offspring dispersal but identified a significant effect of clutch size, to our
surprise with dispersal declining with increasing clutch size. We discuss this
result in a context of the ‘public information hypothesis’ (reinterpreted for
juveniles in a nonsocial foraging species), suggesting that conspecific abundance
perhaps acts as an indicator of local habitat quality. Thus, our analysis
suggests a microgeographic structuring of the adult female population driven
by genetic factors, either through inbreeding avoidance, or from simply
avoiding individuals with a similar genotype regardless of their pedigree
relatedness, while a nongenetic factor seems more important in their offspring.

Item Type: Article
Authors/Creators:Ryberg, K and Olsson, M and Wapstra, E and Madsen, T and Anderholm, S and Ujvari, B
Keywords: dispersal; inbreeding; maternal–offspring effects; nongenetic factors; ‘public information hypothesis’; relatedness
Journal or Publication Title: Journal of Evolutionary Biology
ISSN: 1010-061X
DOI / ID Number: 10.1111/j.1420-9101.2004.00798.x
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