| Title: | Microbial metabolites elicit distinct olfactory and gustatory preferences in bumblebees |
| Author(s): | Schaeffer RN; Rering CC; Maalouf I; Beck JJ; Vannette RL; |
| Address: | "Department of Entomology, Washington State University, Pullman, WA 99164, USA. Department of Entomology and Nematology, University of California Davis, Davis, CA 95616, USA. Chemistry Research Unit, Center for Medical, Agricultural, and Veterinary Entomology, Agricultural Research Service, United States Department of Agriculture, Gainesville, FL 32608, USA" |
| ISSN/ISBN: | 1744-957X (Electronic) 1744-9561 (Print) 1744-9561 (Linking) |
| Abstract: | "Animals such as bumblebees use chemosensory cues to both locate and evaluate essential resources. Increasingly, it is recognized that microbes can alter the quality of foraged resources and produce metabolites that may act as foraging cues. The distinct nature of these chemosensory cues however and their use in animal foraging remain poorly understood. Here, we test the hypothesis that species of nectar-inhabiting microbes differentially influence pollinator attraction and feeding via microbial metabolites produced in nectar. We first examined the electrophysiological potential for bumblebee (Bombus impatiens) antennal olfactory neurons to respond to microbial volatile organic compounds (mVOCs), followed by an olfactory preference test. We also assessed gustatory preferences for microbial-altered nectar through both no-choice and choice feeding assays. Antennal olfactory neurons responded to some mVOCs, and bees preferred nectar solutions inoculated with the bacterium Asaia astilbes over the yeast Metschnikowia reukaufii based on volatiles alone. However, B. impatiens foragers consumed significantly more Metschnikowia-inoculated nectar, suggesting distinct roles for mVOCs and non-volatile metabolites in mediating both attraction and feeding decisions. Collectively, our results suggest that microbial metabolites have significant potential to shape interspecific, plant-pollinator signalling, with consequences for forager learning, economics and floral host reproduction" |
| Keywords: | Animals Bees Flowers *Metschnikowia Plant Nectar Plants *Pollination Smell Asaia astilbes Metschnikowia reukaufii bumblebee microbial volatile organic compounds nectar microbes pollination; |
| Notes: | "MedlineSchaeffer, Robert N Rering, Caitlin C Maalouf, Isabelle Beck, John J Vannette, Rachel L eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2019/07/18 Biol Lett. 2019 Jul 26; 15(7):20190132. doi: 10.1098/rsbl.2019.0132. Epub 2019 Jul 17" |
