Journal
JOURNAL OF CHEMICAL ECOLOGY
Volume 43, Issue 2, Pages 164-171Publisher
SPRINGER
DOI: 10.1007/s10886-017-0818-z
Keywords
Carbon dioxide; Acyrthosiphon pisum; Predator-prey interaction; (E)-beta-farnesene; Signal dynamic
Categories
Funding
- Fund for Research Training in Industry and Agriculture (FRIA)
- Centre Universitaire de Recherche en Agronomie et ingenierie biologique de Gembloux (CURAGx), University of Liege
- Fund for Scientific Research (F.R.S.- FNRS)
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Insects often rely on olfaction to communicate with conspecifics. While the chemical language of insects has been deciphered in recent decades, few studies have assessed how changes in atmospheric greenhouse gas concentrations might impact pheromonal communication in insects. Here, we hypothesize that changes in the concentration of atmospheric carbon dioxide affect the whole dynamics of alarm signaling in aphids, including: (1) the production of the active compound (E)-beta-farnesene (E beta f), (2) emission behavior when under attack, (3) perception by the olfactory apparatus, and (4) the escape response. We reared two strains of the pea aphid, Acyrthosiphon pisum, under ambient and elevated CO2 concentrations over several generations. We found that an increase in CO2 concentration reduced the production (i.e., individual content) and emission (released under predation events) of E beta f. While no difference in E beta f neuronal perception was observed, we found that an increase in CO2 strongly reduced the escape behavior expressed by an aphid colony following exposure to natural doses of alarm pheromone. In conclusion, our results confirm that changes to greenhouse gases impact chemical communication in the pea aphid, and could potentially have a cascade effect on interactions with higher trophic levels.
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