Adaptation to stressful environments : invasion success of the Colorado potato beetle (Leptinotarsa decemlineata)
Biological invasions, specifically human-induced dispersals, are one of the major
threats to our biodiversity and are predicted to increase. Invasive pests provide
an opportunity to study whether adaptation to human-induced environments
could promote invasions to other human-induced environments. One major
anthropogenic selection pressure is created by pesticides, and pests can be
exposed to various pesticides in their native, as well as introduced, ranges. I
investigated whether exposure to anthropogenic selection (i.e. insecticides and
herbicides) and exposure to multiple anthropogenic stressors selects for higher
stress tolerance. I also tested whether parental prolonged diapause or insecticide
exposure can increase larval stress tolerance, using an invasive pest (Leptinotarsa
decemlineata) as a study species. First, I found that populations differ in their
insecticide resistance, which could be due to their past invasion history, as well
as past intensity of selection by insecticides. Differences in the resistance were
due to both qualitative and quantitative changes in the insecticide target sites, but
also due to higher antioxidant defence. These differences also lead to differences
in stress tolerance when the individuals were exposed to other pesticides.
Second, I found that exposure to both herbicide and insecticide can have
interactive effects (both antagonistic and synergistic). Third, I found that
prolonged diapause could be a strategy to skip environmental conditions the
species is poorly adapted to, however, it carries a sex-specific fertility cost, which
could be mitigated by higher offspring body mass. Last, I found that exposure to
sublethal doses of insecticide had positive within- and transgenerational effects,
by means of increased female body mass and survival. To conclude, exposure to
anthropogenic stress could select in addition to pesticide resistance for higher
stress tolerance and can induce changes in fitness-related traits and thus
contribute to the invasion success of the Leptinotarsa decemlineata.
...


Publisher
Jyväskylän yliopistoISBN
978-951-39-7528-9ISSN Search the Publication Forum
2489-9003Contains publications
- Artikkeli I: Margus A., Piiroinen S., Lehmann P., Grapputo A., Chen Y., Ovčarenko I., Gilbert L., & Lindström L. Roles of acetylcholinesterase genes in organophosphate and carbamate resistance in Leptinotarsa decemlineata. Manuscript.
- Artikkeli II: Rainio, M. J., Margus, A., Lehmann, P., Helander, M., & Lindström, L. (2019). Effects of a glyphosate-based herbicide on survival and oxidative status of a non-target herbivore, the Colorado potato beetle (Leptinotarsa decemlineata). Comparative Biochemistry and Physiology Part C : Toxicology & Pharmacology, 215, 47-55. DOI: 10.1016/j.cbpc.2018.09.005
- Artikkeli III: Margus, A., Rainio, M., & Lindström, L. (2019). Can Indirect Herbicide Exposure Modify the Response of the Colorado Potato Beetle to an Organophosphate Insecticide?. Journal of Economic Entomology, 112 (5), 2316-2323. DOI: 10.1093/jee/toz115
- Artikkeli IV: Margus, Aigi; Lindström, Leena (2020). Prolonged diapause has sex-specific fertility and fitness costs. Evolutionary Ecology, 34 (1), 41-57. DOI: 10.1007/s10682-019-10024-1
- Artikkeli V: Margus, Aigi; Piiroinen, Saija; Lehmann, Philipp; Tikka, Santtu; Karvanen, Juha; Lindström, Leena (2019). Sublethal Pyrethroid Insecticide Exposure Carries Positive Fitness Effects Over Generations in a Pest Insect. Scientific Reports, 9, 11320. DOI: 10.1038/s41598-019-47473-1
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- JYU Dissertations [127]
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