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When predicting the fate and consequences of recurring deleterious mutationsin self-fertilising populations most models developed make the assumption thatpopulations have discrete non-overlapping generations. This makes thembiologically irrelevant when considering perennial species with over-lappinggenerations and where mating occurs independently of the age group. Previousmodels studying the effect of perennial life-histories on the geneticproperties of populations in the presence of self-fertilisation have done soconsidering age-dependent selection and have found that, contrary to empiricalobservations, perennial populations should exhibit lower levels of inbreedingdepression. Here we propose a simple deterministic model in continuous timewith selection at different fitness traits and feedback between populationfitness and size. We find that a perennial life-history can result in highlevels of inbreeding depression in spite of inbreeding, due to higherfrequencies of heterozygous individuals at the adult stage. We also proposethat there may be demographic advantages for self-fertilisation that areindependent of reproductive success.

Perennial life-histories and demographic advantages may play contradictory roles in the evolution of plant mating systems