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High levels of effective long-distance dispersal may blur ecotypic divergence in a rare terrestrial orchid

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High levels of effective long-distance dispersal may blur ecotypic divergence in a rare terrestrial orchid. / Vanden Broeck, An; Van Landuyt, Wouter; Cox, Karen; De Bruyn, Luc; Gyselings, Ralf; Oostermeijer, Gerard; Valentin, Bertille; Bozic, Gregor; Dolinar, Branko; Illyés, Zoltán; Mergeay, Joachim.

In: BMC Ecology, Vol. 14, Nr. 1, 07.07.2014, blz. 20.

Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikel

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@article{ee2f24fe0ff54129adfe1d96e2614d97,
title = "High levels of effective long-distance dispersal may blur ecotypic divergence in a rare terrestrial orchid",
abstract = "BACKGROUND: Gene flow and adaptive divergence are key aspects of metapopulation dynamics and ecological speciation. Long-distance dispersal is hard to detect and few studies estimate dispersal in combination with adaptive divergence. The aim of this study was to investigate effective long-distance dispersal and adaptive divergence in the fen orchid (Liparis loeselii (L.) Rich.). We used amplified fragment length polymorphism (AFLP)-based assignment tests to quantify effective long-distance dispersal at two different regions in Northwest Europe. In addition, genomic divergence between fen orchid populations occupying two distinguishable habitats, wet dune slacks and alkaline fens, was investigated by a genome scan approach at different spatial scales (continental, landscape and regional) and based on 451 AFLP loci.RESULTS: We expected that different habitats would contribute to strong divergence and restricted gene flow resulting in isolation-by-adaptation. Instead, we found remarkably high levels of effective long-distance seed dispersal and low levels of adaptive divergence. At least 15{\%} of the assigned individuals likely originated from among-population dispersal events with dispersal distances up to 220 km. Six (1.3{\%}) 'outlier' loci, potentially reflecting local adaptation to habitat-type, were identified with high statistical support. Of these, only one (0.22{\%}) was a replicated outlier in multiple independent dune-fen population comparisons and thus possibly reflecting truly parallel divergence. Signals of adaptation in response to habitat type were most evident at the scale of individual populations.CONCLUSIONS: The findings of this study suggest that the homogenizing effect of effective long-distance seed dispersal may overwhelm divergent selection associated to habitat type in fen orchids in Northwest Europe.",
author = "{Vanden Broeck}, An and {Van Landuyt}, Wouter and Karen Cox and {De Bruyn}, Luc and Ralf Gyselings and Gerard Oostermeijer and Bertille Valentin and Gregor Bozic and Branko Dolinar and Zolt{\'a}n Illy{\'e}s and Joachim Mergeay",
year = "2014",
month = "7",
day = "7",
doi = "10.1186/1472-6785-14-20",
language = "English",
volume = "14",
pages = "20",
journal = "BMC Ecology",
publisher = "BioMed Central Ltd",
number = "1",

}

RIS

TY - JOUR

T1 - High levels of effective long-distance dispersal may blur ecotypic divergence in a rare terrestrial orchid

AU - Vanden Broeck, An

AU - Van Landuyt, Wouter

AU - Cox, Karen

AU - De Bruyn, Luc

AU - Gyselings, Ralf

AU - Oostermeijer, Gerard

AU - Valentin, Bertille

AU - Bozic, Gregor

AU - Dolinar, Branko

AU - Illyés, Zoltán

AU - Mergeay, Joachim

PY - 2014/7/7

Y1 - 2014/7/7

N2 - BACKGROUND: Gene flow and adaptive divergence are key aspects of metapopulation dynamics and ecological speciation. Long-distance dispersal is hard to detect and few studies estimate dispersal in combination with adaptive divergence. The aim of this study was to investigate effective long-distance dispersal and adaptive divergence in the fen orchid (Liparis loeselii (L.) Rich.). We used amplified fragment length polymorphism (AFLP)-based assignment tests to quantify effective long-distance dispersal at two different regions in Northwest Europe. In addition, genomic divergence between fen orchid populations occupying two distinguishable habitats, wet dune slacks and alkaline fens, was investigated by a genome scan approach at different spatial scales (continental, landscape and regional) and based on 451 AFLP loci.RESULTS: We expected that different habitats would contribute to strong divergence and restricted gene flow resulting in isolation-by-adaptation. Instead, we found remarkably high levels of effective long-distance seed dispersal and low levels of adaptive divergence. At least 15% of the assigned individuals likely originated from among-population dispersal events with dispersal distances up to 220 km. Six (1.3%) 'outlier' loci, potentially reflecting local adaptation to habitat-type, were identified with high statistical support. Of these, only one (0.22%) was a replicated outlier in multiple independent dune-fen population comparisons and thus possibly reflecting truly parallel divergence. Signals of adaptation in response to habitat type were most evident at the scale of individual populations.CONCLUSIONS: The findings of this study suggest that the homogenizing effect of effective long-distance seed dispersal may overwhelm divergent selection associated to habitat type in fen orchids in Northwest Europe.

AB - BACKGROUND: Gene flow and adaptive divergence are key aspects of metapopulation dynamics and ecological speciation. Long-distance dispersal is hard to detect and few studies estimate dispersal in combination with adaptive divergence. The aim of this study was to investigate effective long-distance dispersal and adaptive divergence in the fen orchid (Liparis loeselii (L.) Rich.). We used amplified fragment length polymorphism (AFLP)-based assignment tests to quantify effective long-distance dispersal at two different regions in Northwest Europe. In addition, genomic divergence between fen orchid populations occupying two distinguishable habitats, wet dune slacks and alkaline fens, was investigated by a genome scan approach at different spatial scales (continental, landscape and regional) and based on 451 AFLP loci.RESULTS: We expected that different habitats would contribute to strong divergence and restricted gene flow resulting in isolation-by-adaptation. Instead, we found remarkably high levels of effective long-distance seed dispersal and low levels of adaptive divergence. At least 15% of the assigned individuals likely originated from among-population dispersal events with dispersal distances up to 220 km. Six (1.3%) 'outlier' loci, potentially reflecting local adaptation to habitat-type, were identified with high statistical support. Of these, only one (0.22%) was a replicated outlier in multiple independent dune-fen population comparisons and thus possibly reflecting truly parallel divergence. Signals of adaptation in response to habitat type were most evident at the scale of individual populations.CONCLUSIONS: The findings of this study suggest that the homogenizing effect of effective long-distance seed dispersal may overwhelm divergent selection associated to habitat type in fen orchids in Northwest Europe.

U2 - 10.1186/1472-6785-14-20

DO - 10.1186/1472-6785-14-20

M3 - A1: Web of Science-article

C2 - 24998243

VL - 14

SP - 20

JO - BMC Ecology

JF - BMC Ecology

IS - 1

ER -

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