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Plant-Insect Ecosystems

10-Minute Paper

P-IE: Biocontrol On-Demand Presentations

Effects of genetic diversity on Mastrus ridens (Hymenoptera: Ichneumonidae) fitness when exposed to variable and extreme temperatures

On-Demand
On-Demand

    Presenting Author(s)

  • Barbara Morales

    Agricultural engineer
    Pontificia Universidad Católica de Chile
    Santiago, Region Metropolitana, Chile

    • Co-Author(s)

  • Tania Zaviezo

    Full Professor
    Pontificia Universidad Católica de Chile
    Santiago, Region Metropolitana, Chile

Genetic variability can affect the response of insects to variable and stressful environmental conditions. In this study we compared fitness traits of females of the parasitoid Mastrus ridens (Hymenoptera: Ichneumonidae) from endogamic and exogamic populations when exposed to optimum constant temperatures (OT = 25°C) or variable extreme temperatures (VT = 1 h at 33°C, 20 min at 25ºC and 1 h at 6°C and the rest of the time at 25°C) throughout their adult life.
There was no significant effect of population types or temperature regimes on parasitism and longevity, although there was a trend for females from endogamic populations in VT to live less than in OT and less than females from exogamic populations in both conditions. There was an effect of population, temperature regimes and their interaction on total progeny, with more progeny produced by females from exogamic populations in OT, followed by exogamic populations VT, endogamic populations OT and endogamic populations VT. There was a trend for fewer sons in VT, and in the case of number of daughters, there was a significant interaction of populations and temperature regimes, with females from exogamic populations producing more daughters in OT while females in endogamic populations producing more in VT.
In general, our results support the hypothesis that lower genetic variability can have a negative impact on the fitness of parasitoids when exposed to stressful environmental conditions.