Analysis of sexual phenotype and prezygotic fertility in natural populations of<i>Fucus spiralis, F. vesiculosus</i>(Fucaceae, Phaeophyceae) and their putative hybrids

Billard, Emmanuelle; Serrão, Ester Á.; Pearson, Gareth A.; Engel, Carolyn R.; Destombe, Christophe; Valéro, Myriam

doi:10.1080/09670260500334354

Cited by 32 publications

(37 citation statements)

References 44 publications

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“…Species-specific allele frequencies were also identified at all loci except Fsp3 and the combination of microsatellite loci allowed the distinction between the two species across their range. This is consistent with the species-specific alleles already identified by Billard et al, (2005b) to distinguish F. spiralis, F. vesiculosus and F. ceranoides in Brittany (France).…”

Section: Marker Resolution For Distinguishing Genotypessupporting

confidence: 74%

Implications of mating system for genetic diversity of sister algal species:Fucus spiralisandFucus vesiculosus(Heterokontophyta, Phaeophyceae)

Perrin¹,

Daguin²,

Vliet³

et al. 2007

European Journal of Phycology

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The implications of mating system for genetic diversity were assessed in the sister species Fucus spiralis and Fucus vesiculosus using a combination of ten microsatellite markers. Five new microsatellite markers specific for F. spiralis were developed in order to increase marker resolution and complement the results (i.e. mating system and genetic diversity extended to a larger geographic scale) acquired using five microsatellite loci previously developed from a mixed fucoid seaweed DNA library that excluded F. spiralis. Low genetic diversities observed at the population and species level in F. spiralis using the five new F. spiralis-specific loci described here were consistent with the results obtained previously with non-specific microsatellite loci. Results revealed that selfing is characteristic in F. spiralis across its latitudinal distribution along the Iberian and French Atlantic coasts. Higher levels of within-population genetic diversity were observed in the outcrossing species F. vesiculosus, decreasing towards the southern distributional range of the species. Some cases of significant biparental inbreeding in this species are indicative of short gamete dispersal or mating of spatially or temporally structured populations. In contrast to within-population diversities, higher total genetic diversity among populations was observed in the hermaphroditic species in comparison to the dioecious F. vesiculosus.

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Section: Marker Resolution For Distinguishing Genotypessupporting

confidence: 74%

Implications of mating system for genetic diversity of sister algal species:Fucus spiralisandFucus vesiculosus(Heterokontophyta, Phaeophyceae)

Perrin¹,

Daguin²,

Vliet³

et al. 2007

European Journal of Phycology

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“…Methods to estimate the influence of species' traits on lineage diversification establish hermaphroditic lineages as ancestral in the family, evolving into dioecious lineages, folowed by switches from dioecy to hermaphroditism in the genus Fucus , contradicting earlier suggestions [24,51]. There is considerable support for hermaphroditism (cosexuality) as the ancestral state in plants [15], and simple genetic mechanisms of dioecious sex determination and sex chromosome evolution have been proposed (reviewed by [52,53]).…”

Section: Discussionmentioning

confidence: 87%

Driving south: a multi-gene phylogeny of the brown algal family Fucaceae reveals relationships and recent drivers of a marine radiation

et al. 2011

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BackgroundUnderstanding the processes driving speciation in marine ecosystems remained a challenge until recently, due to the unclear nature of dispersal boundaries. However, recent evidence for marine adaptive radiations and ecological speciation, as well as previously undetected patterns of cryptic speciation is overturning this view. Here, we use multi-gene phylogenetics to infer the family-level evolutionary history of Fucaceae (intertidal brown algae of the northern Pacific and Atlantic) in order to investigate recent and unique patterns of radiative speciation in the genus Fucus in the Atlantic, in contrast with the mainly monospecific extant genera.ResultsWe developed a set of markers from 13 protein coding genes based on polymorphic cDNA from EST libraries, which provided novel resolution allowing estimation of ancestral character states and a detailed reconstruction of the recent radiative history. Phylogenetic reconstructions yielded similar topologies and revealed four independent trans-Arctic colonization events by Fucaceae lineages, two of which also involved transitions from hermaphroditism to dioecy associated with Atlantic invasions. More recently, reversion of dioecious ancestral lineages towards hermaphroditism has occurred in the genus Fucus, particularly coinciding with colonization of more extreme habitats. Novel lineages in the genus Fucus were also revealed in association with southern habitats. These most recent speciation events occurred during the Pleistocene glaciations and coincided with a shift towards selfing mating systems, generally southward shifts in distribution, and invasion of novel habitats.ConclusionsDiversification of the family occurred in the Late-Mid Miocene, with at least four independent trans-Artic lineage crossings coincident with two reproductive mode transitions. The genus Fucus arose in the Pliocene but radiated within a relatively short time frame about 2.5 million years ago. Current species distributions of Fucus suggest that climatic factors promoted differentiation between the two major clades, while the recent and rapid species radiation in the temperate clade during Pleistocene glacial cycles coincided with several potential speciation drivers.

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“…A. Coyer & G. Hoarau 2004, unpublished data). The apparent generality of asymmetrical hybridization in Fucus involving a hermaphroditic mother and a dioecious father may be due to differences in sperm-egg recognition proteins and/or to the production of substantially fewer sperm per egg in hermaphroditic species of Fucus (40 : 1) relative to dioecious species (400 : 1) (Vernet & Harper 1980;Billard et al 2005).…”

Section: Results and Discussion (A) Icelandmentioning

confidence: 99%

Convergent adaptation to a marginal habitat by homoploid hybrids and polyploid ecads in the seaweed genusFucus

et al. 2006

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Hybridization and polyploidy are two major sources of genetic variability that can lead to adaptation in new habitats. Most species of the brown algal genus Fucus are found along wave-swept rocky shores of the Northern Hemisphere, but some species have adapted to brackish and salt marsh habitats. Using five microsatellite loci and mtDNA RFLP, we characterize two populations of morphologically similar, muscoides-like Fucus inhabiting salt marshes in Iceland and Ireland. The Icelandic genotypes were consistent with Fucus vesiculosus × Fucus spiralis F 1 hybrids with asymmetrical hybridization, whereas the Irish ones consisted primarily of polyploid F. vesiculosus .

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Analysis of sexual phenotype and prezygotic fertility in natural populations ofFucus spiralis, F. vesiculosus(Fucaceae, Phaeophyceae) and their putative hybrids

Cited by 32 publications

References 44 publications

Implications of mating system for genetic diversity of sister algal species:Fucus spiralisandFucus vesiculosus(Heterokontophyta, Phaeophyceae)

Implications of mating system for genetic diversity of sister algal species:Fucus spiralisandFucus vesiculosus(Heterokontophyta, Phaeophyceae)

Driving south: a multi-gene phylogeny of the brown algal family Fucaceae reveals relationships and recent drivers of a marine radiation

Convergent adaptation to a marginal habitat by homoploid hybrids and polyploid ecads in the seaweed genusFucus

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