Heterozygosity, inbreeding and neonatal traits in Soay sheep on St Kilda.

Abstract:

:We investigated whether birth weight and neonatal survival, a period within which 24% of all mortalities occur, were correlated with levels of inbreeding in St Kilda Soay sheep, using pedigree inbreeding coefficients and four marker-based estimators of inbreeding. None of the inbreeding estimators, either of the offspring, or of their mothers, explained significant variation in a lamb's birth weight or probability of surviving the neonatal period, suggesting low inbreeding depression for these traits. We evaluated the correlation between the marker-based measures of inbreeding and inbreeding coefficients obtained from the Soay pedigree, where paternal links were inferred using the same panel of microsatellite markers. Even when using a relatively complete portion of the pedigree, in which all individuals had known maternal and paternal grandparents, the correlation was found to be weak (r = -0.207, where mean f = 0.0168). These results add support to the recent prediction that when the mean and variance in inbreeding are low in a population, heterozygosity-fitness correlations can be very weak or even undetectable. The pursuit of more detailed pedigrees offers the best prospect for identifying inbreeding depression within this study population.

journal_name

Mol Ecol

journal_title

Molecular ecology

authors

Overall AD,Byrne KA,Pilkington JG,Pemberton JM

doi

10.1111/j.1365-294X.2005.02682.x

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

3383-93

issue

11

eissn

0962-1083

issn

1365-294X

pii

MEC2682

journal_volume

14

pub_type

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