Self‐compatibility is over‐represented on islands

Grossenbacher, Dena L.; Brandvain, Yaniv; Auld, Josh R.; Burd, Martin; Cheptou, Pierre‐Olivier; Conner, Jeffrey K.; Grant, Alannie G; Hovick, Stephen M.; Pannell, John R.; Pauw, Anton; Petanidou, Theodora; Randle, April M.; Casas, Rafael Rubio de; Vamosi, Jana C.; Winn, Alice A.; Igić, Boris; Busch, Jeremiah W.; Kalisz, Susan; Goldberg, Emma E.

doi:10.1111/nph.14534

Cited by 87 publications

(89 citation statements)

References 55 publications

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“…Given that continental islands have been connected to the mainland in the past, mates and pollinators might be less likely to be lacking than on the usually much younger and more remote oceanic islands, which have never been connected to the mainland and where all species were new colonizers or their descendants. In line with this, Grossenbacher et al () found that for Asteraceae, Brassicaceae and Solanaceae, self‐compatible species occurred more often on islands than self‐incompatible ones did, and that this effect was stronger for oceanic than for continental islands. Whether this also holds true across other angiosperm families remains to be tested.…”

Section: Introductionmentioning

confidence: 74%

Autofertility and self‐compatibility moderately benefit island colonization of plants

Razanajatovo

Kleunen

Kreft

et al. 2018

Global Ecol Biogeogr

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Aim The current geographical distribution of species largely reflects colonization success after natural long‐distance dispersal or introduction by humans. Plants with selfing ability should have an advantage when establishing on islands where mates and pollinators are limited (Baker’s law). However, high percentages of dioecious and self‐incompatible species have been reported for some islands, possibly resulting from post‐colonization evolution. Given that such evolution is less likely to apply to alien species recently introduced to islands by humans, tests of Baker’s law on islands need to consider both native and naturalized alien species. Location Global. Time period Undefined. Major taxa studied Angiosperms. Methods To test whether the colonization of islands is associated with selfing ability (self‐compatibility and autofertility), we combined three comprehensive global databases: one on breeding systems of species, one on island and mainland distributions of native species and one on global naturalization of alien plants. We assigned each of a total of 1,752 species, from 161 angiosperm families, as mainland species, island colonists and/or island endemics (i.e., species that are restricted to islands). To assess potential relationships between island occurrence and selfing ability of species, we used multinomial logistic regressions. Results We found that species with high selfing ability were slightly more likely to be island colonist than mainland species. However, selfing ability did not increase the likelihood of being an island endemic in contrast to mainland species. Among island colonists, selfing ability did not differ between species on oceanic and on continental islands or between species native to islands and naturalized on islands. Main conclusions We performed a comprehensive test of Baker’s law by considering many angiosperm families, using continuous metrics of self‐compatibility and autofertility and including both native and naturalized species. We provide global evidence that high selfing ability may foster island colonization of angiosperms.

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Section: Introductionmentioning

confidence: 74%

Autofertility and self‐compatibility moderately benefit island colonization of plants

Razanajatovo

Kleunen

Kreft

et al. 2018

Global Ecol Biogeogr

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“…Evolutionary shifts towards larger leaf and seed sizes on islands, for example, may be driven by competition between congeneric species (Kavanagh & Burns, ). Similarly, the abundance of adaptive floral morphologies and pollination traits such as self‐compatibility may be driven both by the scarcity of compatible mates or the absence of pollinators (Grossenbacher et al ., ; Razanajatovo et al ., ). Taxa that do not rely heavily on biotic interactions should be favoured in island colonisation because a population may be founded on a single individual (Crawford et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Island disharmony revisited using orchids as a model group

et al. 2019

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Summary One central concept in island biology is that island assemblages form subsets of the mainland species pool, being disproportionately rich or poor in certain taxonomic groups. This unbalanced composition, termed ‘disharmony’, is generally explained using a taxon‐centred approach, linking the over‐ or under‐representation of taxa to their colonisation abilities. However, islands may also harbour ‘functionally’ disharmonic flora, being disproportionately rich or poor in species with certain traits, which may offer greater insights into the processes driving island colonisation. Here, we use orchids as a model to illustrate key processes involved in the formation of functionally disharmonic island floras, including filtering effects (for example biotic interactions), and speciation. Our synthesis is based on a comprehensive orchid dataset of 27 637 species and combines both a literature review and simple exploratory analyses to show that orchids are significantly under‐represented on islands relative to mainland regions and that insular orchids display shifts in functional traits, from the shortening of nectar spurs to facilitate ornithophily to changes in colour associated with generalist insect pollinators. We highlight that taxa are simply coarse proxies and that we need to consider species traits and interactions to gain a full understanding of the processes constraining plant assembly on islands.

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“…Subsequent work has revealed other examples of this general pattern (Barrett ; Grossenbacher et al. ), but also important exceptions, notably the abundance of dioecious plants on the Hawaiian archipelago (Carlquist ).…”

mentioning

confidence: 98%

Effect of partial selfing and polygenic selection on establishment in a new habitat

Sachdeva

2019

Evolution

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This article analyzes how partial selfing in a large source population influences its ability to colonize a new habitat via the introduction of a few founder individuals. Founders experience inbreeding depression due to partially recessive deleterious alleles as well as maladaptation to the new environment due to selection on a large number of additive loci. I first introduce a simplified version of the inbreeding history model to characterize mutation‐selection balance in a large, partially selfing source population under selection involving multiple nonidentical loci. I then use individual‐based simulations to study the eco‐evolutionary dynamics of founders establishing in the new habitat under a model of hard selection. The study explores how selfing rate shapes establishment probabilities of founders via effects on both inbreeding depression and adaptability to the new environment, and also distinguishes the effects of selfing on the initial fitness of founders from its effects on the long‐term adaptive response of the populations they found. A high rate of (but not complete) selfing is found to aid establishment over a wide range of parameters, even in the absence of mate limitation. The sensitivity of the results to assumptions about the nature of polygenic selection is discussed.

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Self‐compatibility is over‐represented on islands

Cited by 87 publications

References 55 publications

Autofertility and self‐compatibility moderately benefit island colonization of plants

Autofertility and self‐compatibility moderately benefit island colonization of plants

Island disharmony revisited using orchids as a model group

Effect of partial selfing and polygenic selection on establishment in a new habitat

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