| Title: |
Subtle ecophysiological divergences in a deceptive strategy to attract the same pollinators in two sympatric Arum |
| Authors: |
Leclerc, Mathieu; Gibernau, Marc; Perdereau, Elfie; Pincebourde, Sylvain |
| Contributors: |
Institut de recherche sur la biologie de l'insecte (IRBI); Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS); Laboratoire « Sciences pour l’Environnement » (UMR CNRS 6134 SPE) (SPE); Centre National de la Recherche Scientifique (CNRS)-Università di Corsica Pasquale Paoli Université de Corse Pascal Paoli |
| Source: |
ISSN: 0305-7364. |
| Publisher Information: |
CCSD; Oxford University Press (OUP) |
| Publication Year: |
2025 |
| Collection: |
Université François-Rabelais de Tours: HAL |
| Subject Terms: |
[SDV.EE.IEO]Life Sciences [q-bio]/Ecology; environment/Symbiosis |
| Description: |
International audience ; Abstract Background and Aims Integrative approaches are mandatory to comprehend the evolution of deceptive pollination strategies, by combining the co-variations in different floral traits and the behaviour of the insects. We applied an ecophysiological approach to compare floral traits – scent and thermogenesis – in two deceptive sympatric Arum that are pollinated mainly by Psychoda moth flies. We hypothesized that floral traits diverged between the two arums to minimize their interference in pollinators’ attraction. Methods We measured several floral traits, including the timing of anthesis, thermogenesis patterns and floral volatile organic compounds, in Arum italicum and A. maculatum. Additionally, we conducted laboratory experiments to determine the diel activity rhythm of the moth fly Psychoda sigma. We compared the flies’ activity window to the anthesis timing and we compared the two arums in the ability of their volatiles to increase pollinator activity. Key Results The main thermogenesis peak involved in pollinator attraction was cooler and occurred slightly earlier during the day in A. maculatum compared to A. italicum. The fly P. sigma appeared to be nocturnal, so inflorescences emitting their floral scent before sunset are less likely to be visited by pollinators due to the relatively short attractive (few hours) female phase. Regarding scents, we confirmed a strong differentiation between the two Arum species. Behavioural assays with P. sigma revealed a slightly stronger stimulation to the odour of A. maculatum compared to A. italicum. Conclusions Our integrative approach highlights that the two Arum species exhibit slightly shifted daily timing of anthesis, indicating a fine-tuned variation in their attractive volatiles and thermogenesis sequences in relation to pollinator behaviour. A trade-off may exist between odour specificity and the ability to maximize volatile emission. These findings illustrate how evolutionarily close and sympatric species have shifted their ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1093/aob/mcaf090 |
| Availability: |
https://hal.science/hal-05127910; https://hal.science/hal-05127910v1/document; https://hal.science/hal-05127910v1/file/Leclerc%20et%20al.%202025%20annals%20of%20botany_accepted.pdf; https://doi.org/10.1093/aob/mcaf090 |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.39121BBC |
| Database: |
BASE |