Description

This data set is extracted from a study of genetic polymorphisms potentially associated to migration behaviour in the blackcap (Sylvia atricapilla). Across different populations in Europe and Africa, the average migration behaviour was found to correlate with average allele size (dependent on the number of repeats of a small DNA motif) at the locus ADCYAP1, encoding a neuropeptide. This data set is quite small and ill-suited for separating random-effect variance from residual variance. The likelihood surface for the Matérn model actually has local maxima.

Usage

Format

The data frame includes 14 observations on the following variables:

latitude

latitude, indeed.

longitude

longitude, indeed.

migStatus

migration status as determined by Mueller et al, from 0 (resident populations) to 2.5 (long-distance migratory populations)

means

Mean allele sizes in each population

pos

Numerical index for the populations

Details

Migration status was coded as : pure resident populations as '0', resident populations with some migratory restlessness as '0.5', partial migratory populations as '1', completely migratory populations migrating short-distances as '1.5', intermediate-distance migratory populations as '2' and distinct long-distance migratory populations as '2.5'.

Source

Data from Mueller et al. (2011), including supplementary material now available from doi: 10.1098/rspb.2010.2567.

References

Mueller, J. C., Pulido, F., and Kempenaers, B. 2011. Identification of a gene associated with avian migratory behaviour, Proc. Roy. Soc. (Lond.) B 278, 2848-2856.

Examples