Pollinator-mediated evolution of floral signals

Schiestl, Florian P.; Johnson, Steven D.

doi:10.1016/j.tree.2013.01.019

Cited by 470 publications

(452 citation statements)

References 92 publications

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“…The benefit of larger floral displays is associated with the cognition ability of bees (Schiestl & Johnson 2013), for which visual cues might enhance their efficiency (Kunze & Gumbert 2001). The lack of a relationship between tree visitation rate and density of flowering conspecifics could be related to the absence of competition or facilitation.…”

Section: Discussionmentioning

confidence: 99%

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil

2018

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Plant-pollinator interactions and their reproductive implications are of central importance to the organization of plant populations and communities in restoration areas. We studied the breeding system and flower visitors of Pleroma trichopodum, a pioneer species of the Atlantic Forest. We attempted to answer three questions: (1) Is P. trichopodum dependent on pollinators and mates for reproduction? (2) What are the pollinators of P. trichopodum? (3) Do tree flower-density and flowering-tree density of P. trichopodum enhance the visitation rate of focal trees and their flowers? We tested the breeding system through pollination treatments. We performed focal observations on 10 trees and analyzed the relationship between tree and flower visitation rates, and the tree flower-density and flowering-tree density with Generalized Linear Mixed Models (GLMM). Pleroma trichopodum sets fruits by selfing and outcrossing, both of which occur only through pollinator visits. Bees visited P. trichopodum, and their visitation increased with tree flower-density. Thus, individuals with greater floral displays may function as magnet species, enhancing the pollination of nearby plant species. This characteristic, allied with the ability to reproduce without a mate (selfing) and a tolerance of soggy soils, make P. trichopodum a candidate for Atlantic Forest restoration.

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Section: Discussionmentioning

confidence: 99%

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil

2018

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“…That said, the strength of the interaction is unlikely to have been solely determined by flower abundance, given that factors including nectar and pollen reward (Hoover et al, 2012;Schiestl and Johnson, 2013), flower colour (Campbell et al, 2010), and odours (Cunningham et al, 2006;Junker et al, 2010) have also been shown to predict the number of interactions.…”

Section: Size Of Potential Effects Between Mango and Plant Species Inmentioning

confidence: 99%

“…Flower abundance is often an important predictor of indirect interactions, as a greater number of flowers equates to a greater chance of being encountered, patches containing many flowers can be more easily detected (Schiestl and Johnson, 2013), and pollinators tend to visit more inflorescences in larger patches of flowers (Goulson, 2000). That the strength of indirect effects increased with flower abundance at a greater rate for weeds and exotic plant species flowering in mango fields than for species growing in natural vegetation highlights the value of weeds in supporting flower visitors, an observation that has been noted elsewhere (Carvalheiro et al, 2011;Nel et al, 2017).…”

Section: Factors Affecting Potential Indirect Effects Between Mango Amentioning

confidence: 99%

Indirect interactions between crops and natural vegetation through flower visitors: the importance of temporal as well as spatial spillover

Simba

Foord

Thébault

et al. 2018

Agriculture, Ecosystems & Environment

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“…This wide floral variation is considered to be the result of their interactions with pollinators (Darwin, 1862; Fægri & van der Pijl, 1979). Flowers signal to pollinators by a variety of cues and the extent of fertilization success associated with the variance of a trait creates selection on this trait (Aigner, 2006; Harder & Johnson, 2009; Schiestl & Johnson, 2013; Sletvold, Grindeland, & Ågren, 2010). Much attention was given in the last decades to the quantification of the extent of selection exerted by pollinators on various floral traits, including flower size, color, and scent (Harder & Johnson, 2009; Schiestl & Johnson, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Flowers signal to pollinators by a variety of cues and the extent of fertilization success associated with the variance of a trait creates selection on this trait (Aigner, 2006; Harder & Johnson, 2009; Schiestl & Johnson, 2013; Sletvold, Grindeland, & Ågren, 2010). Much attention was given in the last decades to the quantification of the extent of selection exerted by pollinators on various floral traits, including flower size, color, and scent (Harder & Johnson, 2009; Schiestl & Johnson, 2013). However, the mechanisms maintaining within‐population variation are much less understood and are not necessarily pollinator‐mediated (Gigord, Macnair, & Smithson, 2001; Imbert et al., 2014; de Jager & Ellis, 2014; Lau & Galloway, 2004; Melendez‐Ackerman, Campbell, & Waser, 1997; Rymer, Johnson, & Savolainen, 2010).…”

Section: Introductionmentioning

confidence: 99%

Pollinator‐mediated selection on floral size and tube color in Linum pubescens: Can differential behavior and preference in different times of the day maintain dimorphism?

Lebel

Obolski

Hadany

et al. 2017

Ecology and Evolution

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Diversity of flower traits is often proposed as the outcome of selection exerted by pollinators. Positive directional pollinator‐mediated selection on floral size has been widely shown to reduce phenotypic variance. However, the underlying mechanism of maintaining within‐population floral color polymorphism is poorly understood. Divergent selection, mediated by different pollinators or by both mutualists and antagonists, may create and maintain such polymorphism, but it has rarely been shown to result from differential behavior of one pollinator. We tested whether different behaviors of the same pollinators in morning and evening are associated with dimorphic floral trait in Linum pubescens, a Mediterranean annual plant that exhibits variable within‐population frequencies of dark‐ and light‐colored flower tubes. Usia bicolor bee‐flies, the major pollinators of L. pubescens, are mostly feeding in the flower in the morning, while in the evening they are mostly visiting the flowers for mating. In 2 years of studying L. pubescens in a single large population in the Carmel, Israel, we found in one year that dark‐centered flowers received significantly higher fraction of visits in the morning. Fitness was positively affected by number of visits, but no fitness differences were found between tube‐color morphs, suggesting that both morphs have similar pollination success. Using mediation analysis, we found that flower size was under positive directional pollinator‐mediated selection in both years, but pollinator behavior did not explain entirely this selection, which was possibly mediated also by other agents, such as florivores or a‐biotic stresses. While most pollinator‐mediated selection studies show that flower size signals food reward, in L. pubescens, it may also signal for mating place, which may drive positive selection. While flower size found to be under pollinator‐mediated selection in L. pubescens, differential behavior of the pollinators in morning and evening did not seem to explain flower color polymorphism.

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Pollinator-mediated evolution of floral signals

Cited by 470 publications

References 92 publications

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil

Indirect interactions between crops and natural vegetation through flower visitors: the importance of temporal as well as spatial spillover

Pollinator‐mediated selection on floral size and tube color in Linum pubescens: Can differential behavior and preference in different times of the day maintain dimorphism?

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