Abstracts (first author)
Temperature stress of preceding generations modifies the response to insecticide stress in the invasive Colorado potato beetle
Environmental stress is considered to play a significant role in species invasions. As invasive species expand their range to new areas they have to tolerate and adapt to various stressors such as changes in temperature and stress imposed by human action. It has been hypothesized that phenotypic plasticity may facilitate adaptations by providing broad stress tolerance or inducing adaptive responses when organisms face novel environments. Thus far, only few experimental studies have experimentally investigated the short-term responses of organisms to stressors and how these responses can affect their invasion potential. The influence of cross-generational stress effects on species invasions has received even less attention. We studied whether parental temperature stress affects tolerance to insecticide in the insecticide resistant Colorado potato beetle (Leptinotarsa decemlineata) population. We results show that beetles were in general tolerant to stress. The parental temperature stress alone affected beetles positively (increased adult body mass) but it impaired their tolerance to insecticide exposure. In contrast, offspring from the favourable temperature regime showed compensatory weight gain in response to insecticide exposure. Our study show that exposure to stress can involve various responses which can differ in the degree and direction (beneficial, harmful) depending on whether preceding generations have experienced temperature stress. Our study emphasizes the importance of evolution as well as plastic responses in the invasion of species to novel environments.