Asymmetrical nature of the Trollius-Chiastocheta interaction: insights into the evolution of nursery pollination systems

Détails

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_ECEC52EBE930
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Asymmetrical nature of the Trollius-Chiastocheta interaction: insights into the evolution of nursery pollination systems
Périodique
Ecology and Evolution
Auteur(s)
Suchan T., Beauverd M., Trim N., Alvarez N.
ISSN
2045-7758 (electronic)
ISSN-L
2045-7758
Statut éditorial
Publié
Date de publication
2015
Volume
5
Numéro
21
Pages
4766-4777
Langue
anglais
Résumé
The mutualistic versus antagonistic nature of an interaction is defined by costs and benefits of each partner, which may vary depending on the environment. Contrasting with this dynamic view, several pollination interactions are considered as strictly obligate and mutualistic. Here, we focus on the interaction between Trollius europaeus and Chiastocheta flies, considered as a specialized and obligate nursery pollination system - the flies are thought to be exclusive pollinators of the plant and their larvae develop only in T.europaeus fruits. In this system, features such as the globelike flower shape are claimed to have evolved in a coevolutionary context. We examine the specificity of this pollination system and measure traits related to offspring fitness in isolated T.europaeus populations, in some of which Chiastocheta flies have gone extinct. We hypothesize that if this interaction is specific and obligate, the plant should experience dramatic drop in its relative fitness in the absence of Chiastocheta. Contrasting with this hypothesis, T.europaeus populations without flies demonstrate a similar relative fitness to those with the flies present, contradicting the putative obligatory nature of this pollination system. It also agrees with our observation that many other insects also visit and carry pollen among T.europaeus flowers. We propose that the interaction could have evolved through maximization of by-product benefits of the Chiastocheta visits, through the male flower function, and selection on floral traits by the most effective pollinator. We argue this mechanism is also central in the evolution of other nursery pollination systems.
Mots-clé
Asymmetrical interactions, brood-site pollination, Chiastocheta, conditional outcomes, mutualism, plant-pollinator interactions, pollinator community, pollinator loss, reproductive ecology, reproductive success, Trollius europaeus
Web of science
Open Access
Oui
Création de la notice
07/12/2015 10:05
Dernière modification de la notice
20/08/2019 16:14
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