Interspecific pollen transfer as a mechanism of competition: effect of &lt;i&gt;Castilleja&lt;/i&gt; &lt;i&gt;linariaefolia&lt;/i&gt; pollen on seed set of &lt;i&gt;Ipomopsis&lt;/i&gt; &lt;i&gt;aggregata&lt;/i&gt;

Caruso, Christina M.; Alfaro, Mónica

doi:10.1139/cjb-78-5-600

Cited by 19 publications

(5 citation statements)

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“…Additionally, the order of receipt of Euphorbia pollen may be important, as shown by the trend in the 2005 greenhouse study toward decreased seed set only when Euphorbia pollen is received prior to Viola pollen. For natural pollen receipt, conspecific pollen may be received first or simultaneously with heterospecific pollen, and similar to the trend in this study, other studies have found that heterospecific pollen reduces fecundity only if received prior to conspecific pollen (Waser and Fugate 1986;Caruso and Alfaro 2000).…”

Section: Discussionsupporting

confidence: 86%

“…Several studies in other systems (Waser 1978;Galen and Gregory 1989;Murphy and Aarssen 1995;Caruso and Alfaro 2000;Brown and Mitchell 2001) have found reduced fecundity resulting from heterospecific pollen receipt, as found here for Viola in the greenhouse. However, other studies have found no significant reduction in reproductive success with heterospecific pollen receipt (Campbell and Motten 1985;Armbruster and McGuire 1991;Kwak and Jennersten 1991), and it remains an ongoing challenge to determine what traits of pollen and recipient flowers lead heterospecific pollen to cause decreased fecundity (Murphy 2002).…”

Section: Discussionsupporting

confidence: 83%

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Effect of introduced Euphorbia esula on the pollination of Viola pedatifida

Montgomery

2009

Botany

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Introduced plants may compete for pollination with native plants, resulting in reduced fruit or seed set. In this study, I use several techniques to assess whether the invasive plant Euphorbia esula L. (leafy spurge, Euphorbiaceae) reduces the pollination success of chasmogamous flowers of the native plant Viola pedatifida G. Don (prairie violet, Violaceae), which has chasmogamous and cleistogamous flowers. Euphorbia pollen was found on most Viola stigmas, suggesting the potential for competition. Additionally, application of Euphorbia pollen to Viola stigmas prior to conspecific pollen reduced seed set. However, natural receipt of Euphorbia and other heterospecific pollen was not associated with decreased fruit or seed set. In the field, fruit set was higher for Viola in sites with Euphorbia despite increased Euphorbia pollen receipt, and seed set did not vary with the presence of Euphorbia. However, there was no significant interaction between the presence of Euphorbia and flower type (cleistogamous or chasmogamous), suggesting that increased fruit set near Euphorbia is unrelated to pollination. This study suggests that Viola and Euphorbia interact through shared pollinators, but there is no evidence that competition for pollination with Euphorbia reduces Viola's fecundity or results in increased reliance on cleistogamous flowers. Résumé :Les plantes introduites peuvent compétitionner pour la pollinisation avec les plantes indigènes, et entraîner ainsi une réduction des fruits ou des graines. L'auteur a utilisé plusieurs techniques pour déterminer si l'espèce adventice Euphorbia esula L. (euphorbe esule, Euphorbiaceae) réduit le succès de la pollinisation des fleurs chasmogames de la plante indigène Viola pedatifida G. Don (violette des prés) qui possède des fleurs chasmogames et cléistogames. On retrouve le pollen de l'euphorbe sur la plupart des stigmates de la violette, ce qui suggère une compétition potentielle. On observe de plus que l'addition de pollen de l'Euphorbe sur les stigmates de la violette avant une pollinisation conspécifique réduit la production de semences. Au champ, la violette produit plus de fruits sur les sites avec l'euphorbe en dépit d'une augmentation du pollen d'euphorbe reçu, et en présence de l'euphorbe la production de graines ne varie pas. Cependant, il n'y a pas d'interaction significative en présence de l'euphorbe et le type de fleur (cléistogames ou chasmogames), ce qui suggère que l'augmentation de la mise à fruit près de l'euphorbe ne serait pas liée à la pollinisation. Les résultats suggèrent que la violette et l'euphorbe interagissent par le partage de pollinisateurs, mais on n'observe aucune preuve de compétition pour la pollinisation entraînant une réduction de la fécondité de la violette par l'euphorbe ou un recours préférentiel aux fleurs cléistogames.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 83%

Effect of introduced Euphorbia esula on the pollination of Viola pedatifida

Montgomery

2009

Botany

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“…From the female perspective, further study is required to fully understand fitness consequences. Foreign pollen may block the stigmatic surface or clog the staminal column (Armbruster & Herzig 1984;Caruso & Alfaro 2000;Brown & Mitchell 2001), or it may fertilize ovules, leading to the production of inviable seeds or unfit hybrid offspring (Arnold & Hodges 1995). It should be noted that, from either the male or the female perspective, competition through interspecific pollen transfer differs from more traditional forms of competition in that the fitness costs will be experienced regardless of whether or not pollinators are a limiting resource.…”

Section: Discussionmentioning

confidence: 99%

“…In support of this idea, a recent meta-analysis of pollination studies demonstrated a global pattern in that plants in regions with the greatest species richness face the highest levels of pollen limitation ( Vamosi et al 2006). When multiple species share the same guild of pollinators, visitation patterns can lead to competition through interspecific pollen transfer (sensu Waser 1983), a form of reproductive interference (sensu Armbruster et al 1994) that imposes fitness costs, such as pollen loss to foreign stigmas and stigma blockage by foreign pollen (Campbell & Motten 1985;Caruso & Alfaro 2000;Brown & Mitchell 2001). Competition through interspecific pollen transfer differs from traditional forms of competition in that the pollinator 'resource' need not be limiting for the negative effects to be manifested.…”

Section: Introductionmentioning

confidence: 99%

Character displacement among bat-pollinated flowers of the genusBurmeistera: analysis of mechanism, process and pattern

2007

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Coexisting plants that share pollinators can compete through interspecific pollen transfer. A long-standing idea holds that divergence in floral morphology may reduce this competition by placing pollen on different regions of the pollinator's bodies. However, surprisingly little empirical support for this idea exists. Burmeistera is a diverse neotropical genus that exhibits wide interspecific variation in the degree to which the reproductive parts are exserted outside the corolla. Coexisting Burmeistera share bats as their primary pollinators, and the degree of exsertion determines the site of pollen deposition on the bats' heads. Here we study the mechanism, process and pattern of floral character displacement for assemblages of coexisting Burmeistera. Flight cage experiments with bats and pairs of Burmeistera species demonstrate that the greater the divergence in exsertion length, the less pollen transferred interspecifically. Null model analyses of exsertion lengths for 19 species of Burmeistera across 18 sites (each containing two to four species) demonstrate that observed assemblage structure is significantly overdispersed relative to what would be expected by chance. Local evolution, rather than ecological sorting, appears to be the primary process driving this pattern of overdispersion because local adaptation of the nine widespread species accounts for a large portion of the observed pattern. Taken together, results of this study provide strong support for the idea that competition through interspecific pollen transfer can drive character displacement in plants.

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“…Diferentes estudios observaron efectos negativos en la adecuación de las plantas cuando el polen interespecífico se depositó antes del polen conespecífico (Caruso & Alfaro, 2000) aunque esto depende de cada especie (Hao et al, 2023;Streher et al, 2020). Es probable que la transferencia de polen interespecífico durante esta primera hora reduzca las posibilidades de la existencia de estos efectos negativos en la adecuación de nuestras especies.…”

Section: Proporción De Flores Con Depósito De Análogos De Polenunclassified

Restricción y facilitación de transferencia de análogos de polen intra e interespecífica

Ramos-Chuquimia,

Zelada,

Benitez-Vieyra

et al. 2024

rcti

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Las flores han desarrollado diversas señales para atraer a los polinizadores, como el color y la forma. Además, algunas especies han desarrollado morfotipos que difieren en la posición de sus órganos sexuales (heterostilia). El objetivo de este estudio fue determinar si la transferencia de polen estará restringida por la especie, entre dos especies con flores morfológicamente similares, Turnera krapovickasii (Passifloraceae) y Pavonia sidifolia (Malvaceae), y si dentro de una misma especie, T. krapovickasii, la transferencia de polen está facilitada por la heterostilia. Para observar la transferencia de polen se utilizaron polvos fluorescentes como análogos. Se realizó una prueba de chi cuadrado para evaluar si la transferencia de análogos de polen fue mayor o menor de lo esperado al azar. Nuestros resultados muestran que la transferencia de análogos estuvo restringida por la especie siendo menor de lo esperado al azar. Por otro lado, la transferencia no fue facilitada por la presencia de heterostilia, la transferencia intra morfotipo fue mayor de lo esperado al azar. Los resultados reflejan la tendencia de los polinizadores a visitar las flores de un mismo individuo antes de moverse a otro, por lo menos durante la primera hora de exposición de los análogos. Se recomienda evaluar la transferencia de polen incrementando el tiempo de exposición de los análogos de polen, evaluar el efecto de la distancia entre los parches de T. krapovickasii y P. sidifolia y además investigar más sobre los polinizadores que comparten.

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Interspecific pollen transfer as a mechanism of competition: effect of <i>Castilleja</i> <i>linariaefolia</i> pollen on seed set of <i>Ipomopsis</i> <i>aggregata</i>

Cited by 19 publications

References 0 publications

Effect of introduced Euphorbia esula on the pollination of Viola pedatifida

Effect of introduced Euphorbia esula on the pollination of Viola pedatifida

Character displacement among bat-pollinated flowers of the genusBurmeistera: analysis of mechanism, process and pattern

Restricción y facilitación de transferencia de análogos de polen intra e interespecífica

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