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[40]Generalist foraging of pollinators: diet expansion at high density

   [41]C Fontaine, [42]CL Collin, [43]I Dajoz - Journal of Ecology, 2008 - Wiley
   Online Library
   [44]C Fontaine, [45]CL Collin, [46]I Dajoz
   Journal of Ecology, 2008 o Wiley Online Library
   Summary 1 Plant-pollinator interactions are crucial for the reproduction of most
   angiosperms. When faced with perturbations, plant-pollinator networks might be
   robust
   mainly due to the presence of highly generalist species. Perturbations can, in
   turn, affect
   how pollinators exploit their food sources and therefore their degree of
   generalization. 2 In
   particular, generalization of pollinators might vary with forager density. At
   high densities
   floral resources available in plant communities would be more rapidly depleted
   than at low ...
   Summary
     * 1
       Plant-pollinator interactions are crucial for the reproduction of most
       angiosperms. When faced with perturbations, plant-pollinator networks might
       be robust mainly due to the presence of highly generalist species.
       Perturbations can, in turn, affect how pollinators exploit their food sources
       and therefore their degree of generalization.
     * 2
       In particular, generalization of pollinators might vary with forager density.
       At high densities floral resources available in plant communities would be
       more rapidly depleted than at low densities. According to optimal foraging
       theory (OFT), this decrease in resources should lead to an increase in diet
       breadth.
     * 3
       We investigated the impact of pollinator density on diet breadth of Bombus
       terrestris. We recorded the individual foraging behaviour of bumblebees from
       eight colonies. They foraged in presence of either one or several
       conspecifics on experimental plant communities composed of five plant
       species. Diet breadth was calculated as the number of plant species visited,
       as well as by the Levins index. We analyzed the effect of forager density on
       diet breadth at both the individual and the colony levels.
     * 4
       We found that forager density affected degree of generalization at individual
       and colony levels. A more competitive environment increased individual
       generalization, as predicted by OFT, and decreased the variability in
       generalization across colonies. Moreover, we found that bumblebee size was
       positively related to the amplitude of diet breadth change.
     * 5
       Synthesis. Our study sheds light on an additional level of complexity of
       plant-pollinator systems, showing that pollinator diet breadth is a flexible
       trait which results from behavioural adaptation to resource availability.
       More generally, changes in foraging insects' diet via competition for
       resources are likely to ensue from anthropogenic ecosystem disturbance and to
       impact upon the functioning of plant-pollinator networks.

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