Divergent and Reticulate Evolution in Closely Related Species of Sphagnum Section Subsecunda

Shaw, A. Jonathan; Melosik, Iwona; Cox, Cymon J.; Boles, Sandra B.

doi:10.1639/0007-2745(2005)108[0363:dareic]2.0.co;2

Cited by 20 publications

(14 citation statements)

References 36 publications

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“…In R. riparioides, like in other groups of aquatic mosses (e.g. Fontinalis, Shaw and Allen, 2000; Sphagnum, Shaw et al, 2005), geography rather than morphology accounts for the patterns of genetic variation observed. Thus the European accessions of R. riparioides are resolved as sister to the European endemic R. alopecuroides, whereas the North American accessions of R. riparioides occur at the opposite side of the phylogeny along with the pantropical R. aquaticum.…”

Section: Discussionmentioning

confidence: 87%

Morphology informed by phylogeny reveals unexpected patterns of species differentiation in the aquatic moss Rhynchostegium riparioides s.l.

Hutsemékers

Vieira

Ros

et al. 2012

Molecular Phylogenetics and Evolution

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a b s t r a c tBryophyte floras typically exhibit extremely low levels of endemism. The interpretation, that this might reflect taxonomic shortcomings, is tested here for the Macaronesian flora, using the moss species complex of Rhynchostegium riparioides as a model. The deep polyphyly of R. riparioides across its distribution range reveals active differentiation that better corresponds to geographic than morphological differences. Morphometric analyses are, in fact, blurred by a size gradient that accounts for 80% of the variation observed among gametophytic traits. The lack of endemic diversification observed in R. riparioides in Macaronesia weakens the idea that the low rates of endemism observed in the Macaronesian bryophyte flora might solely be explained by taxonomic shortcomings. To the reverse, the striking polyphyly of North American and European lineages of R. riparioides suggests that the similarity between the floras of these continents has been over-emphasized. Discriminant analyses point to the existence of morphological discontinuities among the lineages resolved by the molecular phylogeny. The global rate of error associated to species identification based on morphology (0.23) indicates, however, that intergradation of shape and size characters among species in the group challenges their identification.

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Section: Discussionmentioning

confidence: 87%

Morphology informed by phylogeny reveals unexpected patterns of species differentiation in the aquatic moss Rhynchostegium riparioides s.l.

Hutsemékers

Vieira

Ros

et al. 2012

Molecular Phylogenetics and Evolution

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“…However, in spite of extensive molecular studies on the S. subsecundum complex (Shaw et al 2005), the origin of S. denticulatum is still unknown and several scenarios may be considered, e.g., a "homoploid hybrid speciation" from a diploid, or different evolutionary lineages of S. inundatum in which reproductive isolation might arise, e.g., through ecological divergence (see also: Ungerer et al 1998, Buerkle et al 2000, Doyle et. al.…”

Section: Origin Of S Denticulatummentioning

confidence: 99%

“…In a study by Shaw et al (2005), the demarcation of species in the S. subsecundum complex was based on polymorphisms of nuclear rDNA sequences, anonymous nuclear loci, and chloroplast sequence data (cpDNA) for over 70 samples collected across the Northern Hemisphere. The ShimodairaHasegawa tests (Swofford 2001) indicated that the monophyly of S. denticulatum is supported, whereas that of other members of the complex such as S. inundatum, S. lescurii, and S. subsecundum is rejected (Shaw et al 2005).…”

Section: Genetic Backgroundmentioning

confidence: 99%

“…The ShimodairaHasegawa tests (Swofford 2001) indicated that the monophyly of S. denticulatum is supported, whereas that of other members of the complex such as S. inundatum, S. lescurii, and S. subsecundum is rejected (Shaw et al 2005).…”

Section: Genetic Backgroundmentioning

confidence: 99%

“…A relatively low level of genotypic diversity of terrestrial populations, which occasionally exhibit sexual reproduction, compared to the aquatic, permanently submerged, and clonally propagated plants in analyzed nuclear and chloroplast DNA regions (Shaw et al 2005, see also Stenøien and Såstad 2001), may be explained by recurrent and quick adaptation of the gametophores growing on the lake shore to permanently submerged conditions. When extinctions in the sink populations and migrants from the source are frequent, one can expect some or small genetic differentiation between sink and source populations.…”

Section: Genetic Backgroundmentioning

confidence: 99%

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The effect of the ploidy level and genetic background of Sphagnum denticulatum on its morphology and ecological requirements

Melosik

2009

Oceanological and Hydrobiological Studies

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This paper presents a current study on the morphology, genetic variability, and ecological requirements of the gametophytically diploid S. denticulatum (Bryophyta, Sphagnaceae). Its broad variations in morphology and physiology, coupled with its low genetic variability, may be explained by epigenetic remodeling in response to environmental heterogeneity.Phenotypes initiated via a plastic response can be canalized in the stable and predictable conditions on the bottom of Lobelia lakes. The problem of the different development of these isolated populations is a matter for further taxonomic studies and discussion.Taking into account the great physiological tolerance and massive development of S. denticulatum, predominantly in man-made and man-modified habitats, the question arises: how far should we go to protect this species? This is particularly important at sites where it threatens the survival of other protected plants. 1

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Resolving boundaries between species inSphagnumsectionSubsecundausing microsatellite markers

Karlin

Boles

Shaw

2008

TAXON

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Populations and species of Sphagnum section Subsecunda are morphologically variable and it is often difficult from studying field‐collected plants and herbarium specimens to delimit species. Allelic patterns at 20 microsatellite loci indicate that three distinguishable gene pools can be identified among plants from Australia and New Zealand. All three species are morphologically variable along a moisture gradient and this appears to be largely plastic, without genetic differentiation among species specific morphotypes. Sphagnum novozelandicum and S. comosum appear to have monoploid gametophytes, are closely related, and are endemic to Australia and New Zealand. The former usually occurs at or above water level and the latter is an aquatic plant with extensive morphological variation, ranging from simplex to branched morphotypes. Sphagnum fuscovinosum and S. simplex are synonyms of S. comosum. The third species is a highly disjunct population of the S. auriculatum/S. inundatum complex of Europe, which has not previously been reported for Australia and New Zealand. These plants appear to be polyploid and are genetically and morphologically distinct from both S. novo‐zelandicum and S. comosum. All three species had duplicated loci amplified by one of the microsatellite primer pairs. Ten Sphagnum species are now reported for Australia and New Zealand, with three of these being endemic.

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Divergent and Reticulate Evolution in Closely Related Species of Sphagnum Section Subsecunda

Cited by 20 publications

References 36 publications

Morphology informed by phylogeny reveals unexpected patterns of species differentiation in the aquatic moss Rhynchostegium riparioides s.l.

Morphology informed by phylogeny reveals unexpected patterns of species differentiation in the aquatic moss Rhynchostegium riparioides s.l.

The effect of the ploidy level and genetic background of Sphagnum denticulatum on its morphology and ecological requirements

Resolving boundaries between species inSphagnumsectionSubsecundausing microsatellite markers

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