Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea

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Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea. / Chapurlat, Elodie; Ågren, Jon; Anderson, Joseph; Friberg, Magne; Sletvold, Nina.

I: New Phytologist, Vol. 222, Nr. 4, 2019, s. 2009-2022.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Chapurlat, E, Ågren, J, Anderson, J, Friberg, M & Sletvold, N 2019, 'Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea', New Phytologist, vol. 222, nr. 4, s. 2009-2022. https://doi.org/10.1111/nph.15747

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Author

Chapurlat, Elodie ; Ågren, Jon ; Anderson, Joseph ; Friberg, Magne ; Sletvold, Nina. / Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea. I: New Phytologist. 2019 ; Vol. 222, Nr. 4. s. 2009-2022.

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TY - JOUR

T1 - Conflicting selection on floral scent emission in the orchid Gymnadenia conopsea

AU - Chapurlat, Elodie

AU - Ågren, Jon

AU - Anderson, Joseph

AU - Friberg, Magne

AU - Sletvold, Nina

PY - 2019

Y1 - 2019

N2 - Floral scent is a crucial trait for pollinator attraction. Yet only a handful of studies have estimated selection on scent in natural populations and no study has quantified the relative importance of pollinators and other agents of selection. In the fragrant orchid Gymnadenia conopsea, we used electroantennographic data to identify floral scent compounds detected by local pollinators and quantified pollinator-mediated selection on emission rates of 10 target compounds as well as on flowering start, visual display and spur length. Nocturnal pollinators contributed more to reproductive success than diurnal pollinators, but there was significant pollinator-mediated selection on both diurnal and nocturnal scent emission. Pollinators selected for increased emission of two compounds and reduced emission of two other compounds, none of which were major constituents of the total bouquet. In three cases, pollinator-mediated selection was opposed by nonpollinator-mediated selection, leading to weaker or no detectable net selection. Our study demonstrates that minor scent compounds can be targets of selection, that pollinators do not necessarily favour stronger scent signalling, and that some scent compounds are subject to conflicting selection from pollinators and other agents of selection. Hence, including floral scent traits into selection analysis is important for understanding the mechanisms behind floral evolution.

AB - Floral scent is a crucial trait for pollinator attraction. Yet only a handful of studies have estimated selection on scent in natural populations and no study has quantified the relative importance of pollinators and other agents of selection. In the fragrant orchid Gymnadenia conopsea, we used electroantennographic data to identify floral scent compounds detected by local pollinators and quantified pollinator-mediated selection on emission rates of 10 target compounds as well as on flowering start, visual display and spur length. Nocturnal pollinators contributed more to reproductive success than diurnal pollinators, but there was significant pollinator-mediated selection on both diurnal and nocturnal scent emission. Pollinators selected for increased emission of two compounds and reduced emission of two other compounds, none of which were major constituents of the total bouquet. In three cases, pollinator-mediated selection was opposed by nonpollinator-mediated selection, leading to weaker or no detectable net selection. Our study demonstrates that minor scent compounds can be targets of selection, that pollinators do not necessarily favour stronger scent signalling, and that some scent compounds are subject to conflicting selection from pollinators and other agents of selection. Hence, including floral scent traits into selection analysis is important for understanding the mechanisms behind floral evolution.

KW - agents of selection

KW - conflicting selection

KW - diurnal and nocturnal scent emission

KW - floral evolution

KW - floral scent

KW - pollinator-mediated selection

KW - volatile organic compounds

U2 - 10.1111/nph.15747

DO - 10.1111/nph.15747

M3 - Article

VL - 222

SP - 2009

EP - 2022

JO - New Phytologist

T2 - New Phytologist

JF - New Phytologist

SN - 1469-8137

IS - 4

ER -