Ecological Differentiation Among Clones: The Frozen Niche Variation Model

Vrijenhoek, R. C.

doi:10.1007/978-3-642-69646-6_18

Cited by 185 publications

(171 citation statements)

References 48 publications

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“…Our data alternatively support an extended frozen niche variation model to explain habitat differences between sexuals and apomicts. This model implies that niche occupation by apomicts reflects a subset of that of their parental sexual taxa, whereby apomictic progeny adopt the adaptive peak of sexuals to their ecological niche (31).…”

Section: Discussionmentioning

confidence: 99%

“…26). GP could be explained by (i) an escape from competition between sexuals and apomicts occupying similar niches (27)(28)(29), (ii) selection for asexual genotypes with wider ecological tolerance compared with sexuals ("general purpose" genotype model) (30), and (iii) niche partitioning between sexual parents and their hybrid apomictic progeny, the latter of which have a fixed subset of genetic variation from the sexuals ("frozen-niche variation" model) (31). Despite substantial evidence for GP, the factors responsible for this pattern are poorly understood.…”

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confidence: 99%

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Hybrid apomicts trapped in the ecological niches of their sexual ancestors

Mau

Lovell

Corral

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Asexual reproduction is expected to reduce the adaptive potential to novel or changing environmental conditions, restricting or altering the ecological niche of asexual lineages. Asexual lineages of plants and animals are typically polyploid, an attribute that may influence their genetic variation, plasticity, adaptive potential, and niche breadth. The genus Boechera (Brassicaceae) represents an ideal model to test the relative ecological and biogeographic impacts of reproductive mode and ploidy because it is composed of diploid sexual and both diploid and polyploid asexual (i.e., apomictic) lineages. Here, we demonstrate a strong association between a transcriptionally conserved allele and apomictic seed formation. We then use this allele as a proxy apomixis marker in 1,649 accessions to demonstrate that apomixis is likely to be a common feature across the Boechera phylogeny. Phylogeographic analyses of these data demonstrate (i) species-specific niche differentiation in sexuals, (ii ) extensive niche conservation between differing reproductive modes of the same species, (iii) ploidy-specific niche differentiation within and among species, and (iv) occasional niche drift between apomicts and their sexual ancestors. We conclude that ploidy is a substantially stronger and more common driver of niche divergence within and across Boechera species although variation in both traits may not necessarily lead to niche evolution on the species scale.Boechera | UPGRADE2 | APOLLO | geographic parthenogenesis | niche conservation

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Hybrid apomicts trapped in the ecological niches of their sexual ancestors

Mau

Lovell

Corral

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…Schley et al (2004) showed that coexistence is indeed impossible unless there are significant differences in the competitive ability of the two species. Coexistence could be enhanced if asexuals have a narrower niche than sexuals (the frozen niche variation hypothesis, Vrijenhoek (1984)). However, this may be a difficult argument to apply for many gynogenetic species complexes.…”

Section: Introductionmentioning

confidence: 99%

How populations persist when asexuality requires sex: the spatial dynamics of coping with sperm parasites

2008

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The twofold cost of sex implies that sexual and asexual reproduction do not coexist easily. Asexual forms tend to outcompete sexuals but may eventually suffer higher extinction rates, creating tension between short-and long-term advantages of different reproductive modes. The 'short-sightedness' of asexual reproduction takes a particularly intriguing form in gynogenetic species complexes, in which an asexual species requires sperm from a related sexual host species to trigger embryogenesis. Asexuals are then predicted to outcompete their host, after which neither species can persist. We examine whether spatial structure can explain continued coexistence of the species complex, and assess the evidence based on data on the Amazon molly (Poecilia formosa). A modification of the Levins metapopulation model creates two regions of good prospects for coexistence, connected by a region of poorer patch occupancy levels. In the first case, mate discrimination and/or niche differentiation keep local extinction rates low, and most patches contain both species; the other possibility resembles host-parasite dynamics where parasites frequently drive the host locally extinct. Several dynamical features are counterintuitive and relate to the parasitic nature of interactions in the species complex: for example, high local extinction rates of the asexual species can be beneficial for its own persistence. This creates a link from the evolution of sexual reproduction to that of prudent predation.

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“…Alternatively, asexual species may be hybrids between related sexual species (e.g. Vrijenhoek, 1984;Parker et al, 1989). The various possible origins of asexuality affect the potential genetic variation in the new species.…”

Section: Discussionmentioning

confidence: 99%

Evolution of parthenogenesis in the Otiorhynchus scaber complex

Tomiuk

Loeschcke

1992

Heredity

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A new approach for estimating genetic identity values was applied to a data set on allozyme variation in the weevil, Otiorhynchus scaber (Coleoptera: Curculionidae). This species complex contains sexuals and different races of polyploid asexuals. The results were used to reanalyse the phylogenetic relationship among races and to discuss the monophyletic versus the polyphyletic origin of parthenogenesis. A polyphyletic origin of parthenogenesis was suggested based on the assumption of hybridization between related species, and the extinction of an ancestral species. The genetic diversity among the different races was compared. A decreased number of new mutations with increased ploidy level was found among current populations. This correlation was explained by a lower evolutionary rate in polyploid asexual races than in diploid sexual races.

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Ecological Differentiation Among Clones: The Frozen Niche Variation Model

Cited by 185 publications

References 48 publications

Hybrid apomicts trapped in the ecological niches of their sexual ancestors

Hybrid apomicts trapped in the ecological niches of their sexual ancestors

How populations persist when asexuality requires sex: the spatial dynamics of coping with sperm parasites

Evolution of parthenogenesis in the Otiorhynchus scaber complex

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