Outbreeding and possibly inbreeding depression in a pollinating fig wasp with a mixed mating system

Greeff, Jaco M.; Vuuren, Gert J. Jansen Van; Kryger, Per; Moore, Jamie

doi:10.1038/hdy.2009.2

Cited by 29 publications

(18 citation statements)

References 89 publications

(101 reference statements)

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“…However, the types of organisms we are interested in routinely sibmate and are fairly resistant to inbreeding depression (but see Antolin, 1999;Henter, 2003Greeff et al, 2009), and we do not consider inbreeding depression here.…”

mentioning

confidence: 99%

Sex ratio dependent dispersal when sex ratios vary between patches

Nelson

Greeff

2011

Journal of Theoretical Biology

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Female biased sex ratios reduce competition between brothers when mating takes place within local patches. Male dispersal prior to mating is another strategy that reduces competition between brothers. One may thus expect these two traits to co-evolve and this is partially met in that sex ratios becomes less female biased as dispersal increases. However, the evolutionary stable degree of dispersal is unaffected by the sex ratio. The analytical models developed to reach these conclusions ignored variance in sex ratios since this increases the structural complexity of models. For similar reasons finite clutch sizes are also routinely ignored. To overcome these shortfalls, we developed individual based simulations that allowed us to 2 incorporate realistic clutch sizes and binomial variance in sex ratios between patches. We show that under variable sex ratios, males evolve to more readily disperse away from patches with higher sex ratios than lower sex ratios. We show that, while the dispersal rate is insensitive to the sex ratio when sex ratios are precise, it is affected by the number of males with dispersal decreasing as the number of males decreases.

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confidence: 99%

Sex ratio dependent dispersal when sex ratios vary between patches

Nelson

Greeff

2011

Journal of Theoretical Biology

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“…Although the ecological mechanism persists after the second generation, genetic incompatibility is expected to be fully expressed as recombination breaks cis parental genes complexes (Lynch, 1991). Other mechanisms could also be involved in outbreeding depression, such as interactions between Wolbachia and a fig wasp (Greeff et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Inbreeding depression and low between-population heterosis in recently diverged experimental populations of a selfing species

et al. 2010

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In fragmented populations, genetic drift and selection reduce genetic diversity, which in turn results in a loss of fitness or in a loss of evolvability. Genetic rescue, that is, controlled input of diversity from distant populations, may restore evolutionary potential, whereas outbreeding depression might counteract the positive effect of this strategy. We carried out self-pollination and crosses within and between populations in an experimental subdivided population of a selfing species, Triticum aestivum L., to estimate the magnitude of these two phenomena. Surprisingly, for a self-fertilizing species, we found significant inbreeding depression within each population for four of the six traits studied, indicating that mildly deleterious mutations were still segregating in these populations. The progeny of within-and betweenpopulation crosses was very similar, indicating low betweenpopulation heterosis and little outbreeding depression. We conclude that relatively large population effective sizes prevented fixation of a high genetic load and that local adaptation was limited in these recently diverged populations. The kinship coefficient estimated between the parents using 20 neutral markers was a poor predictor of the progeny phenotypic values, indicating that there was a weak link between neutral diversity and genes controlling fitnessrelated traits. These results show that when assessing the viability of natural populations and the need for genetic rescue, the use of neutral markers should be complemented with information about the presence of local adaptation in the subdivided population.

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“…Offspring that are viable after the Bernoulli trial become adults. Given our current objectives, we simulate evolution under conditions where inbreeding avoidance is adaptive due to strong inbreeding depression, not where inbreeding preference is adaptive due to weak or zero inbreeding depression (Parker, 1979;Kokko & Ots, 2006; or outbreeding depression (Bateson, 1983;Greeff et al, 2009). However, as described above, positive M p and F p values resulting in inbreeding preference are not precluded from evolving, and could potentially arise due to mutation or drift.…”

Section: Inbreeding Depressionmentioning

confidence: 99%

Evolution of precopulatory and post-copulatory strategies of inbreeding avoidance and associated polyandry

Duthie

Bocedi

Germain

et al. 2018

Journal of Evolutionary Biology

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Inbreeding depression is widely hypothesized to drive adaptive evolution of precopulatory and post‐copulatory mechanisms of inbreeding avoidance, which in turn are hypothesized to affect evolution of polyandry (i.e. female multiple mating). However, surprisingly little theory or modelling critically examines selection for precopulatory or post‐copulatory inbreeding avoidance, or both strategies, given evolutionary constraints and direct costs, or examines how evolution of inbreeding avoidance strategies might feed back to affect evolution of polyandry. Selection for post‐copulatory inbreeding avoidance, but not for precopulatory inbreeding avoidance, requires polyandry, whereas interactions between precopulatory and post‐copulatory inbreeding avoidance might cause functional redundancy (i.e. ‘degeneracy’) potentially generating complex evolutionary dynamics among inbreeding strategies and polyandry. We used individual‐based modelling to quantify evolution of interacting precopulatory and post‐copulatory inbreeding avoidance and associated polyandry given strong inbreeding depression and different evolutionary constraints and direct costs. We found that evolution of post‐copulatory inbreeding avoidance increased selection for initially rare polyandry and that evolution of a costly inbreeding avoidance strategy became negligible over time given a lower‐cost alternative strategy. Further, fixed precopulatory inbreeding avoidance often completely precluded evolution of polyandry and hence post‐copulatory inbreeding avoidance, but fixed post‐copulatory inbreeding avoidance did not preclude evolution of precopulatory inbreeding avoidance. Evolution of inbreeding avoidance phenotypes and associated polyandry is therefore affected by evolutionary feedbacks and degeneracy. All else being equal, evolution of precopulatory inbreeding avoidance and resulting low polyandry is more likely when post‐copulatory inbreeding avoidance is precluded or costly, and evolution of post‐copulatory inbreeding avoidance greatly facilitates evolution of costly polyandry.

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Outbreeding and possibly inbreeding depression in a pollinating fig wasp with a mixed mating system

Cited by 29 publications

References 89 publications

Sex ratio dependent dispersal when sex ratios vary between patches

Sex ratio dependent dispersal when sex ratios vary between patches

Inbreeding depression and low between-population heterosis in recently diverged experimental populations of a selfing species

Evolution of precopulatory and post-copulatory strategies of inbreeding avoidance and associated polyandry

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