Fine-scale genetic structure in the orchid Gymnadenia conopsea is not associated with density of flowering plants

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Sletvold, NinaUppsala universitet,Växtekologi och evolution (author)

Fine-scale genetic structure in the orchid Gymnadenia conopsea is not associated with density of flowering plants

Article/chapterEnglish2024

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John Wiley & Sons,2024
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LIBRIS-ID:oai:DiVA.org:uu-513565
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-513565URI
https://doi.org/10.1002/ajb2.16273DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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Premise: Density-dependent pollinator visitation can lead to density-dependent mating patterns and within-population genetic structure. In Gymnadenia conopsea, individuals in low-density patches receive more self pollen than individuals in high-density patches, suggesting higher relatedness at low density. Ongoing fragmentation is also expected to cause more local matings, potentially leading to biparental inbreeding depression.Methods: To evaluate whether relatedness decreases with local density, we analyzed 1315 SNP loci in 113 individuals within two large populations. We quantified within-population genetic structure in one of the populations, recorded potential habitat barriers, and visualized gene flow using estimated effective migration surfaces (EEMS). We further estimated the magnitude of biparental inbreeding depression that would result from matings restricted to within 5 m.Results: There was no significant relationship between local density and relatedness in any population. We detected significant fine-scale genetic structure consistent with isolation by distance, with positive kinship coefficients at distances below 10 m. Kinship coefficients were low, and predicted biparental inbreeding depression resulting from matings within the closest 5 m was a modest 1–3%. The EEMS suggested that rocks and bushes may act as barriers to gene flow within a population.Conclusions: The results suggest that increased self-pollen deposition in sparse patches does not necessarily cause higher selfing rates or that inbreeding depression results in low establishment success of inbred individuals. The modest relatedness suggests that biparental inbreeding depression is unlikely to be an immediate problem following fragmentation of large populations. The results further indicate that habitat structure may contribute to governing fine-scale genetic structure in G. conopsea.

Subject headings and genre

NATURVETENSKAP Biologi Genetik hsv//swe
NATURAL SCIENCES Biological Sciences Genetics hsv//eng
NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
coancestry
density-dependence
fine-scale genetic structure
gene flow
kinship
local density
orchid
pollen dispersal
relatedness
seed dispersal
Biology with specialization in Ecological Botany
Biologi med inriktning mot ekologisk botanik

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Joffard, NinaUnité Evolution-Ecologie-Paléontologie, UMR 8198, University of Lille, France (author)
Söderquist, LinusUppsala universitet,Zooekologi,Växtekologi och evolution(Swepub:uu)linso268 (author)
Uppsala universitetVäxtekologi och evolution (creator_code:org_t)

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In:American Journal of Botany: John Wiley & Sons111:20002-91221537-2197

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By the author/editor: Sletvold, Nina; Joffard, Nina; Söderquist, Linu ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Genetics

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Botany

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

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By the university: Uppsala University

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