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Evolutionary processes in a continental island system: molecular phylogeography of the Aegean Nigella arvensis alliance (Ranunculaceae) inferred from chloroplast DNA

Identifieur interne : 000517 ( Istex/Corpus ); précédent : 000516; suivant : 000518

Evolutionary processes in a continental island system: molecular phylogeography of the Aegean Nigella arvensis alliance (Ranunculaceae) inferred from chloroplast DNA

Auteurs : C. Bittkau ; H. P. Comes

Source :

RBID : ISTEX:39975E344428E0AD4B6439DD52F296ECF89B9A87

English descriptors

Abstract

Continental shelf island systems, created by rising sea levels, provide a premier setting for studying the effects of past fragmentation, dispersal, and genetic drift on taxon diversification. We used phylogeographical (nested clade) and population genetic analyses to elucidate the relative roles of these processes in the evolutionary history of the Aegean Nigella arvensis alliance (= ‘coenospecies’). We surveyed chloroplast DNA (cpDNA) variation in 455 individuals from 47 populations (nine taxa) of the alliance throughout its core range in the Aegean Archipelago and surrounding mainland areas of Greece and Turkey. The study revealed the presence of three major lineages, with largely nonoverlapping distributions in the Western, Central, and Eastern Aegean. There is evidence supporting the idea that these major lineages evolved in situ from a widespread (pan‐Aegean) ancestral stock as a result of multiple fragmentation events, possibly due to the influence of post‐Messinian sea flooding, Pleistocene eustatic changes and corresponding climate fluctuations. Over‐sea dispersal and founder events appear to have played a rather insignificant role in the group's history. Rather, all analytical approaches identified the alliance as an organism group with poor seed dispersal capabilities and a susceptibility to genetic drift. In particular, we inferred that the observed level of cpDNA differentiation between Kikladian island populations of Nigella degenii largely reflects population history, (viz. Holocene island fragmentation) and genetic drift in the near absence of seed flow since their time of common ancestry. Overall, our cpDNA data for the N. arvensis alliance in general, and N. degenii in particular, indicate that historical events were important in determining the phylogeographical patterns seen, and that genetic drift has historically been relatively more influential on population structure than has cytoplasmic gene flow.

Url:
DOI: 10.1111/j.1365-294X.2005.02725.x

Links to Exploration step

ISTEX:39975E344428E0AD4B6439DD52F296ECF89B9A87

Le document en format XML

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<term>Allelic richness</term>
<term>Allopatric fragmentation</term>
<term>American journal</term>
<term>Amova</term>
<term>Anatolia</term>
<term>Andel</term>
<term>Andel shackleton</term>
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<term>Barrett</term>
<term>Biogeography</term>
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<term>Blackwell</term>
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<term>Botaniska notiser</term>
<term>Castelloe templeton</term>
<term>Central aegean</term>
<term>Central greece</term>
<term>Central greek lineage</term>
<term>Character states</term>
<term>Chloroplast</term>
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<term>Coalescent</term>
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<term>Late pleistocene</term>
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<term>Mainland areas</term>
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<term>Molecular ecology</term>
<term>Molecular markers</term>
<term>Molecular phylogenetics</term>
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<term>Nigella arvensis alliance</term>
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<term>Population history</term>
<term>Population structure</term>
<term>Population subdivision</term>
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<term>Primer</term>
<term>Quaternary</term>
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<term>Rechinger</term>
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<term>Regional sets</term>
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<term>Sample sizes</term>
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<term>Blackwell</term>
<term>Blackwell publishing</term>
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<term>Central greece</term>
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<term>Clade</term>
<term>Clade analysis</term>
<term>Cladistic analysis</term>
<term>Coalescent</term>
<term>Coalescent predictions</term>
<term>Coalescent theory</term>
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<term>Computer program</term>
<term>Cpdna</term>
<term>Cpdna data</term>
<term>Cpdna haplotypes</term>
<term>Cpdna level</term>
<term>Cpdna variation</term>
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<term>Founder events</term>
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<term>Gene flow</term>
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<term>Genetic drift</term>
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<term>Geographical distance</term>
<term>Geographical distances</term>
<term>Geographical distribution</term>
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<term>Haplotype</term>
<term>High level</term>
<term>Historical events</term>
<term>Hutchison</term>
<term>Hutchison templeton</term>
<term>Icarica</term>
<term>Independent polymorphisms</term>
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<term>Kassos</term>
<term>Kiklades</term>
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<term>Molecular ecology</term>
<term>Molecular markers</term>
<term>Molecular phylogenetics</term>
<term>Molecular variance</term>
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<term>Nigella degenii</term>
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<term>Population history</term>
<term>Population structure</term>
<term>Population subdivision</term>
<term>Posada</term>
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<term>Primer</term>
<term>Quaternary</term>
<term>Range expansion</term>
<term>Rechinger</term>
<term>Regional population structure</term>
<term>Regional sets</term>
<term>Relative roles</term>
<term>Restriction endonuclease mapping</term>
<term>Sample sizes</term>
<term>Seed flow</term>
<term>Sensu hutchison templeton</term>
<term>Shackleton</term>
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<term>Tfab</term>
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<div type="abstract" xml:lang="en">Continental shelf island systems, created by rising sea levels, provide a premier setting for studying the effects of past fragmentation, dispersal, and genetic drift on taxon diversification. We used phylogeographical (nested clade) and population genetic analyses to elucidate the relative roles of these processes in the evolutionary history of the Aegean Nigella arvensis alliance (= ‘coenospecies’). We surveyed chloroplast DNA (cpDNA) variation in 455 individuals from 47 populations (nine taxa) of the alliance throughout its core range in the Aegean Archipelago and surrounding mainland areas of Greece and Turkey. The study revealed the presence of three major lineages, with largely nonoverlapping distributions in the Western, Central, and Eastern Aegean. There is evidence supporting the idea that these major lineages evolved in situ from a widespread (pan‐Aegean) ancestral stock as a result of multiple fragmentation events, possibly due to the influence of post‐Messinian sea flooding, Pleistocene eustatic changes and corresponding climate fluctuations. Over‐sea dispersal and founder events appear to have played a rather insignificant role in the group's history. Rather, all analytical approaches identified the alliance as an organism group with poor seed dispersal capabilities and a susceptibility to genetic drift. In particular, we inferred that the observed level of cpDNA differentiation between Kikladian island populations of Nigella degenii largely reflects population history, (viz. Holocene island fragmentation) and genetic drift in the near absence of seed flow since their time of common ancestry. Overall, our cpDNA data for the N. arvensis alliance in general, and N. degenii in particular, indicate that historical events were important in determining the phylogeographical patterns seen, and that genetic drift has historically been relatively more influential on population structure than has cytoplasmic gene flow.</div>
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