scholarly journals Peripatric speciation

2018 ◽  
Vol 1 (2) ◽  
pp. 008
Author(s):  
Andrew Z Colvin
Keyword(s):  
Peripatric Speciation

scholarly journals Review of the dinoflagellate cyst <i>Stephanelytron</i> Sarjeant 1961 emend

1999 ◽  
Vol 18 (2) ◽  
pp. 169-182 ◽  
Author(s):  
Bernard Courtinat
Keyword(s):  
New Species ◽  
New Combinations ◽  
Dinoflagellate Cyst ◽  
Peripatric Speciation ◽  
Two New Species ◽  
Endemic Population ◽  
New Evidence ◽  
Upper Callovian ◽  
Posterior Position ◽  
Stratigraphic Range

Abstract. The stratigraphic distribution of the Late Callovian to Early Oxfordian dinoflagellate cyst Stephanelytron Sarjeant 1961 emend provides new evidence pertaining to its evolution. Middle and Upper Callovian times favoured the development of speciations to a short-ranging Stephanelytron community with corona(s) in ventral–posterior position (Stephanelytron brontes, S. callovianum, S. ceto and S. tabulophorum) from eurytopic species with antapical coronas (S. caytonense, S. membranoidium, S. redcliffense and S. scarburghense). The former group of species (except S. tabulophorum) may represent an example of peripatric speciation from an unfavourable mutation. The reduced stratigraphic range gives the appearance of an endemic population. The genus Lagenadinium Piel, 1985 is a junior synonym of Stephanelytron Sarjeant, 1961. A new emendation of Stephanelytron, two new combinations (S. callovianum and S. membranoidium) and two new species (?S. brontes and S. ceto) are proposed.

scholarly journals Peripatric speciation in an endemic Macaronesian plant after recent divergence from a widespread relative

PLoS ONE ◽  
2017 ◽  
Vol 12 (6) ◽  
pp. e0178459 ◽  
Author(s):  
Francisco J. Valtueña ◽  
Tomás Rodríguez-Riaño ◽  
Josefa López ◽  
Carlos Mayo ◽  
Ana Ortega-Olivencia
Keyword(s):  
Peripatric Speciation

scholarly journals Peripatric speciation associated with genome expansion and female-biased sex ratios in the moss genusCeratodon

2018 ◽  
Vol 105 (6) ◽  
pp. 1009-1020 ◽  
Author(s):  
Marta Nieto-Lugilde ◽  
Olaf Werner ◽  
Stuart F. McDaniel ◽  
Petr Koutecký ◽  
Jan Kučera ◽  
...  
Keyword(s):  
Sex Ratios ◽  
Genome Expansion ◽  
Peripatric Speciation

A revision of the New World Euphorbia adiantoides complex (Euphorbiaceae)

Phytotaxa ◽  
2018 ◽  
Vol 350 (3) ◽  
pp. 201
Author(s):  
VICTOR W. STEINMANN ◽  
PABLO CARRILLO-REYES
Keyword(s):  
New World ◽  
Phylogenetic Analyses ◽  
The Other ◽  
Central Mexico ◽  
Northern Population ◽  
Southern Mexico ◽  
Sierra Madre ◽  
Peripatric Speciation ◽  
Nuclear Its ◽  
Multiple Samples

The Euphorbia adiantoides complex is here considered to consist of four species. This group is readily distinguished from other New World Euphorbia by the combination of two unusual features: entire styles with capitate stigmas and dichasial bracts with relatively long, filiform stipules. Euphorbia sonorae is reduced to a synonym of Euphorbia adiantoides, a taxon disjunctly distributed between Mexico and western South America. The other species of the complex are all restricted to Mexico. Two of these are described as new: E. zamudioi, an endemic to the Sierra Madre Oriental, and E. breedlovei, which is widespread in central and southern Mexico. A key to distinguish the species is provided, as too are data concerning their morphology, distribution, habitat, phenology, common names, and uses. Phylogenetic analyses were conducted using the nuclear ITS and the chloroplast psbA-trnH regions and including multiple samples of each species. The phylogenetic results are not always congruent with morphology, and of the four species herein recognized, only Euphorbia zamudioi is suggested to form an exclusive, well-supported lineage. This species is nested within E. breedlovei, and two collections of E. breedlovei from central Mexico are more closely related to E. zamudioi than they are to other E. breedlovei from southern Mexico. We hypothesize that E. zamudioi arose through peripatric speciation, in which a northern population of E. breedlovei became reproductively isolated and morphologically differentiated from the remainder of the populations of E. breedlovei.

scholarly journals Peripatric speciation associated with genome expansion and female-biased sex ratios in the moss genus Ceratodon

2017 ◽  
Author(s):  
Marta Nieto-Lugilde ◽  
Olaf Werner ◽  
Stuart F. McDaniel ◽  
Petr Koutecký ◽  
Jan Kučera ◽  
...  
Keyword(s):  
New Species ◽  
Genome Size ◽  
Population Divergence ◽  
Size Change ◽  
Pcr Marker ◽  
Mediterranean Populations ◽  
Homogeneous Groups ◽  
A Genome ◽  
Peripatric Speciation ◽  
Well Differentiated

ABSTRACTPREMISE OF THE STUDYA period of allopatry is widely believed to be essential for the evolution of reproductive isolation. However, strict allopatry may be difficult to achieve in some cosmopolitan, spore-dispersed groups, like mosses. Here we examine the genetic and genome size diversity in Mediterranean populations of the moss Ceratodon purpureus s.l. to evaluate the role of allopatry and ploidy change in population divergence.METHODSWe sampled populations of the genus Ceratodon from mountainous areas and lowlands of the Mediterranean region, and from western and central Europe. We performed phylogenetic and coalescent analyses on sequences from five nuclear introns and a chloroplast locus to reconstruct their evolutionary history. We also estimated the genome size using flow cytometry, employing propidium iodide, and determined their sex using a sex-linked PCR marker.KEY RESULTSTwo well differentiated clades were resolved, discriminating two homogeneous groups: the widespread C. purpureus and a local group mostly restricted to the mountains in southern Spain. The latter also possessed a genome size 25% larger than the widespread C. purpureus, and the samples of this group consist entirely of females. We also found hybrids, and some of them had a genome size equivalent to the sum of the C. purpureus and Spanish genome, suggesting that they arose by allopolyploidy.CONCLUSIONSThese data suggest that a new species of Ceratodon arose via peripatric speciation, potentially involving a genome size change and a strong female-biased sex ratio. The new species has hybridized in the past with C. purpureus.

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