Document Detail


Age-dependent genetic effects on a secondary sexual trait in male Alpine ibex, Capra ibex.
MedLine Citation:
PMID:  17444905     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Secondary sexual traits, such as horns in ungulates, may be good indicators of genetic quality because they are costly to develop. Genetic effects on such traits may be revealed by examining correlations between multilocus heterozygosity (MLH) and trait value. Correlations between MLH and fitness traits, termed heterozygosity-fitness correlations (HFC), may reflect inbreeding depression or associative overdominance of neutral microsatellite loci with loci directly affecting fitness traits. We investigated HFCs for horn growth, body mass and faecal counts of nematode eggs in wild Alpine ibex (Capra ibex). We also tested if individual inbreeding coefficients (f') estimated from microsatellite data were more strongly correlated with fitness traits than MLH. MLH was more strongly associated with trait variation than f'. We found HFC for horn growth but not for body mass or faecal counts of nematode eggs. The effect of MLH on horn growth was age-specific. The slope of the correlation between MLH and yearly horn growth changed from negative to positive as males aged, in accordance with the mutation accumulation theory of the evolution of senescence. Our results suggest that the horns of ibex males are an honest signal of genetic quality.
Authors:
Achaz Von Hardenberg; Bruno Bassano; Marco Festa-Bianchet; Gordon Luikart; Paolo Lanfranchi; David Coltman
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Molecular ecology     Volume:  16     ISSN:  0962-1083     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-20     Completed Date:  2007-11-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1969-80     Citation Subset:  IM    
Affiliation:
Département de biologie, Université de Sherbrooke, Sherbrooke, Quebec, Canada. fauna@pngp.it
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Body Size
Feces / parasitology
Gene Frequency
Genetics, Population*
Goats / anatomy & histology,  genetics*,  parasitology
Horns / anatomy & histology,  growth & development*
Italy
Male
Microsatellite Repeats / genetics
Nematoda
Sex Characteristics*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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