Imperial College London
Emeritus Professor Russell Lande

Emeritus ProfessorRussellLande

Faculty of Natural Sciences, Department of Life Sciences (Silwood Park)

Emeritus Professor of Population Biology
 
 
 
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Contact

 

r.lande

 
 
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Location

 

Silwood ParkSilwood Park

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Summary

 

Publications

Citation

BibTex format

@article{Porcher:2016:10.1186/s12862-016-0668-2,
author = {Porcher, E and Lande, R},
doi = {10.1186/s12862-016-0668-2},
journal = {BMC Evolutionary Biology},
title = {Inbreeding depression under mixed outcrossing, self-fertilization and sib-mating.},
url = {http://dx.doi.org/10.1186/s12862-016-0668-2},
volume = {16},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - BACKGROUND: Biparental inbreeding, mating between two relatives, occurs at a low frequency in many natural plant populations, which also often have substantial rates of self-fertilization. Although biparental inbreeding is likely to influence the dynamics of inbreeding depression and the evolution of selfing rates, it has received limited theoretical attention in comparison to selfing. The only previous model suggested that biparental inbreeding can favour the maintenance of stable intermediate selfing rates, but made unrealistic assumptions about the genetic basis of inbreeding depression. Here we extend a genetic model of inbreeding depression, describing nearly recessive lethal mutations at a very large number of loci, to incorporate sib-mating. We also include a constant component of inbreeding depression modelling the effects of mildly deleterious, nearly additive alleles. We analyze how observed rates of sib-mating influence the mean number of heterozygous lethals alleles and inbreeding depression in a population reproducing by a mixture of self-fertilization, sib-mating and outcrossing. We finally use the ensuing relationship between equilibrium inbreeding depression and population selfing rate to infer the evolutionarily stable selfing rates expected under such a mixed mating system. RESULTS: We show that for a given rate of inbreeding, sib-mating is more efficient at purging inbreeding depression than selfing, because homozygosity of lethals increases more gradually through sib-mating than through selfing. Because sib-mating promotes the purging of inbreeding depression and the evolution of selfing, our genetic model of inbreeding depression also predicts that sib-mating is unlikely to maintain stable intermediate selfing rates. CONCLUSIONS: Our results imply that even low rates of sib-mating affect plant mating system evolution, by facilitating the evolution of selfing via more efficient purging of inbreeding depression. Alternative mechanisms, such as pol
AU  - Porcher,E
AU  - Lande,R
DO  - 10.1186/s12862-016-0668-2
PY  - 2016///
SN  - 1471-2148
TI  - Inbreeding depression under mixed outcrossing, self-fertilization and sib-mating.
T2  - BMC Evolutionary Biology
UR  - http://dx.doi.org/10.1186/s12862-016-0668-2
UR  - http://hdl.handle.net/10044/1/33136
VL  - 16
ER  -
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