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In nomen omen:the effect of flower distance on female reproductive success of the lax-flowered orchid Anacamptis laxiflora(Orchidaceae)

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Journal of Plant Ecology 2021年第3期14卷 451-464页

作者： Giovanni Scopece nicola criscuolo Salvatore Cozzolino Department of Biology University Federico IIComplesso Universitario MSAvia Cinthia1-80126 NaplesItaly Department of Environmental Systems Science ETH ZiirichZurichSwitzerland

Aims In multiflowered species,the architecture of inflorescences is of primary importance in shaping plant *** aim of this study was to disentangle the role of inflorescence traits in plant female reproductive success and pollination patterns along the inflorescence in the lax-flowered orchid Anacamptis laxiflora,a terrestrial species exploiting a deceptive pollination *** also evaluated whether the relationship between inflorescence traits and female reproductive success was modified by the height of surrounding vegetation and/or by population *** We delimited experimental plots in a natural population of *** tallied the individuals within each plot and categorized low-density plots and high-density plots;then,in part of the plots we manually removed surrounding grass thus producing an equal number of plots with high grass and low *** these plots,we recorded inflorescence traits and female reproductive success(*** number of fruit and their position along the inflorescence).We analyzed these data using generalized linear mixed-effects models(GLMMs)and calculated selection *** Findings We found that all the investigated inflorescence traits influenced female reproductive *** particular,our GLMMs showed that'average flower distance'was the best predictor for shaping reproductive success *** detected significant positive selection on the investigated inflorescence traits,but these selective trends were strictly linked to both the height of the surrounding vegetation and the population density,suggesting a significant influence of local environmental context in shaping selective *** reproductive success was not linked to the position of flowers along the inflorescence,suggesting that pollinators visit flowers randomly along the inflorescence without a detectable preference for a specific *** study highlights the importance of inflorescence traits in shaping female

关键词： food-deceptive orchids inflorescence phenotypic selection plant fitness pollinator-mediated selection

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