Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations.
Several lines of evidence suggest that recent long-distance dispersal may have been important in the evolution of intercontinental distribution ranges of bryophytes. However, the absolute rate of intercontinental migration and its relative role in the development of certain distribution ranges is st...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/348963 2024-09-09T19:57:37+00:00 Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. Szövényi P. TERRACCIANO, STEFANO Ricca M. GIORDANO, SIMONETTA Shaw A. J. Szövényi, P. Terracciano, Stefano Ricca, M. Giordano, Simonetta Shaw, A. J. 2008 STAMPA http://hdl.handle.net/11588/348963 https://doi.org/10.1111/j.1365-294X.2008.04003.x eng eng volume:17 firstpage:5364 lastpage:5377 numberofpages:14 journal:MOLECULAR ECOLOGY http://hdl.handle.net/11588/348963 doi:10.1111/j.1365-294X.2008.04003.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-57449118274 info:eu-repo/semantics/closedAccess Sphagnum ancestral shared polymorphism Genetic structure peat mosses info:eu-repo/semantics/article 2008 ftunivnapoliiris https://doi.org/10.1111/j.1365-294X.2008.04003.x 2024-06-17T15:19:25Z Several lines of evidence suggest that recent long-distance dispersal may have been important in the evolution of intercontinental distribution ranges of bryophytes. However, the absolute rate of intercontinental migration and its relative role in the development of certain distribution ranges is still poorly understood. To this end, the genetic structure of intercontinental populations of six peatmoss species showing an amphi-Atlantic distribution was investigated using microsatellite markers. Methods relying on the coalescent were applied (IM and MIGRATE) to understand the evolution of this distribution pattern in peatmosses. Intercontinental populations of the six peatmoss species were weakly albeit significantly differentiated (average FST = 0.104). This suggests that the North Atlantic Ocean is acting as a barrier to gene flow even in bryophytes adapted to long-range dispersal. The IM analysis suggested a relatively recent split of intercontinental populations dating back to the last two glacial periods (9000–289 000 years ago). In contrast to previous hypotheses, analyses indicated that both ongoing migration and ancestral polymorphism are important in explaining the intercontinental genetic similarity of peatmoss populations, but their relative contribution varies with species. Migration rates were significantly asymmetric towards America suggesting differential extinction of genotypes on the two continents or invasion of the American continent by European lineages. These results indicate that low genetic divergence of amphi-Atlantic populations is a general pattern across numerous flowering plants and bryophytes. However, in bryophytes, ongoing intercontinental gene flow and retained shared ancestral polymorphism must both be considered to explain the genetic similarity of intercontinental populations. Article in Journal/Newspaper North Atlantic IRIS Università degli Studi di Napoli Federico II Molecular Ecology 17 24 5364 5377 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Napoli Federico II |
op_collection_id |
ftunivnapoliiris |
language |
English |
topic |
Sphagnum ancestral shared polymorphism Genetic structure peat mosses |
spellingShingle |
Sphagnum ancestral shared polymorphism Genetic structure peat mosses Szövényi P. TERRACCIANO, STEFANO Ricca M. GIORDANO, SIMONETTA Shaw A. J. Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
topic_facet |
Sphagnum ancestral shared polymorphism Genetic structure peat mosses |
description |
Several lines of evidence suggest that recent long-distance dispersal may have been important in the evolution of intercontinental distribution ranges of bryophytes. However, the absolute rate of intercontinental migration and its relative role in the development of certain distribution ranges is still poorly understood. To this end, the genetic structure of intercontinental populations of six peatmoss species showing an amphi-Atlantic distribution was investigated using microsatellite markers. Methods relying on the coalescent were applied (IM and MIGRATE) to understand the evolution of this distribution pattern in peatmosses. Intercontinental populations of the six peatmoss species were weakly albeit significantly differentiated (average FST = 0.104). This suggests that the North Atlantic Ocean is acting as a barrier to gene flow even in bryophytes adapted to long-range dispersal. The IM analysis suggested a relatively recent split of intercontinental populations dating back to the last two glacial periods (9000–289 000 years ago). In contrast to previous hypotheses, analyses indicated that both ongoing migration and ancestral polymorphism are important in explaining the intercontinental genetic similarity of peatmoss populations, but their relative contribution varies with species. Migration rates were significantly asymmetric towards America suggesting differential extinction of genotypes on the two continents or invasion of the American continent by European lineages. These results indicate that low genetic divergence of amphi-Atlantic populations is a general pattern across numerous flowering plants and bryophytes. However, in bryophytes, ongoing intercontinental gene flow and retained shared ancestral polymorphism must both be considered to explain the genetic similarity of intercontinental populations. |
author2 |
Szövényi, P. Terracciano, Stefano Ricca, M. Giordano, Simonetta Shaw, A. J. |
format |
Article in Journal/Newspaper |
author |
Szövényi P. TERRACCIANO, STEFANO Ricca M. GIORDANO, SIMONETTA Shaw A. J. |
author_facet |
Szövényi P. TERRACCIANO, STEFANO Ricca M. GIORDANO, SIMONETTA Shaw A. J. |
author_sort |
Szövényi P. |
title |
Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
title_short |
Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
title_full |
Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
title_fullStr |
Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
title_full_unstemmed |
Recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-Atlantic peatmoss populations. |
title_sort |
recent divergence, intercontinental dispersal and shared polymorphisms are shaping the genetic structure of amphi-atlantic peatmoss populations. |
publishDate |
2008 |
url |
http://hdl.handle.net/11588/348963 https://doi.org/10.1111/j.1365-294X.2008.04003.x |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
volume:17 firstpage:5364 lastpage:5377 numberofpages:14 journal:MOLECULAR ECOLOGY http://hdl.handle.net/11588/348963 doi:10.1111/j.1365-294X.2008.04003.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-57449118274 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/j.1365-294X.2008.04003.x |
container_title |
Molecular Ecology |
container_volume |
17 |
container_issue |
24 |
container_start_page |
5364 |
op_container_end_page |
5377 |
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1809928545036664832 |