Plant Pollinator Networks along a Gradient of Urbanisation

Abstract : Background: Habitat loss is one of the principal causes of the current pollinator decline. With agricultural intensification, increasing urbanisation is among the main drivers of habitat loss. Consequently studies focusing on pollinator community structure along urbanisation gradients have increased in recent years. However, few studies have investigated how urbanisation affects plant-pollinator interaction networks. Here we assessed modifications of plant-pollinator interactions along an urbanisation gradient based on the study of their morphological relationships. Methodology/Principal Findings: Along an urbanisation gradient comprising four types of landscape contexts (semi-natural, agricultural, suburban, urban), we set up experimental plant communities containing two plant functional groups differing in their morphological traits (“open flowers” and “tubular flowers”). Insect visitations on these communities were recorded to build plant-pollinator networks. A total of 17 857 interactions were recorded between experimental plant communities and flower-visitors. The number of interactions performed by flower-visitors was significantly lower in urban landscape context than in semi-natural and agricultural ones. In particular, insects such as Syrphidae and solitary bees that mostly visited the open flower functional group were significantly impacted by urbanisation, which was not the case for bumblebees. Urbanisation also impacted the generalism of flower-visitors and we detected higher interaction evenness in urban landscape context than in agricultural and suburban ones. Finally, in urban context, these modifications lowered the potential reproductive success of the open flowers functional group. Conclusions/Significance: Our findings show that open flower plant species and their specific flower-visitors are especially sensitive to increasing urbanisation. These results provide new clues to improve conservation measures within urbanised areas in favour of specialist flower-visitors. To complete this functional approach, studies using networks resolved to the species level along urbanised gradients would be required.
Type de document :
Article dans une revue
PLoS ONE, Public Library of Science, 2013, 8 (5), pp.e63421. 〈10.1371/journal.pone.0063421〉
Liste complète des métadonnées

Littérature citée [77 références]  Voir  Masquer  Télécharger

https://hal.sorbonne-universite.fr/hal-01620226
Contributeur : Gestionnaire Hal-Upmc <>
Soumis le : vendredi 20 octobre 2017 - 11:52:33
Dernière modification le : vendredi 16 novembre 2018 - 02:11:40
Document(s) archivé(s) le : dimanche 21 janvier 2018 - 13:56:36

Fichier

journal.pone.0063421.PDF
Publication financée par une institution

Licence


Distributed under a Creative Commons Paternité 4.0 International License

Identifiants

Citation

Benoît Geslin, Benoit Gauzens, Elisa Thebault, Isabelle Dajoz. Plant Pollinator Networks along a Gradient of Urbanisation. PLoS ONE, Public Library of Science, 2013, 8 (5), pp.e63421. 〈10.1371/journal.pone.0063421〉. 〈hal-01620226〉

Partager

Métriques

Consultations de la notice

579

Téléchargements de fichiers

45