Lewis, Lily R.;
Biersma, Elisabeth M.;
Carey, Sarah B.;
Holsinger, Kent;
McDaniel, Stuart F.;
Rozzi, Ricardo;
Goffinet, Bernard
Resolving the northern hemisphere source region for the long-distance dispersal event that gave rise to the South American endemic dung moss Tetraplodon fuegianus
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Medientyp:
E-Artikel
Titel:
Resolving the northern hemisphere source region for the long-distance dispersal event that gave rise to the South American endemic dung moss Tetraplodon fuegianus
Beteiligte:
Lewis, Lily R.;
Biersma, Elisabeth M.;
Carey, Sarah B.;
Holsinger, Kent;
McDaniel, Stuart F.;
Rozzi, Ricardo;
Goffinet, Bernard
Beschreibung:
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<label>PREMISE OF THE STUDY:</label>
<p>American bipolar plant distributions characterize taxa at various taxonomic ranks but are most common in the bryophytes at infraspecific and infrageneric levels. A previous study on the bipolar disjunction in the dung moss genus <italic>Tetraplodon</italic> found that direct long-distance dispersal from North to South in the Miocene–Pleistocene accounted for the origin of the Southern American endemic <italic>Tetraplodon fuegianus</italic>, congruent with other molecular studies on bipolar bryophytes. The previous study, however, remained inconclusive regarding a specific northern hemisphere source region for the transequatorial dispersal event that gave rise to <italic>T</italic>. <italic>fuegianus</italic>.</p>
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<label>METHODS:</label>
<p>To estimate spatial genetic structure and phylogeographic relationships within the bipolar lineage of <italic>Tetraplodon</italic>, which includes <italic>T</italic>. <italic>fuegianus</italic>, we analyzed thousands of restriction-site-associated DNA (RADseq) loci and single nucleotide polymorphisms using Bayesian individual assignment and maximum likelihood and coalescent model based phylogenetic approaches.</p>
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<label>KEY RESULTS:</label>
<p>Northwestern North America is the most likely source of the recent ancestor to <italic>T</italic>. <italic>fuegianus</italic>.</p>
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<label>CONCLUSIONS:</label>
<p>
<italic>Tetraplodon fuegianus</italic>, which marks the southernmost populations in the bipolar lineage of <italic>Tetraplodon</italic>, arose following a single longdistance dispersal event involving a <italic>T</italic>. <italic>mnioides</italic> lineage that is now rare in the northern hemisphere and potentially restricted to the Pacific Northwest of North America. Furthermore, gene flow between sympatric lineages of <italic>Tetraplodon mnioides</italic> in the northern hemisphere is limited, possibly due to high rates of selfing or reproductive isolation.</p>
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