Effect of climate change on population dynamics of bark beetles: relationships between temperature and development rate of Ips sexdentatus (Boern.)

Abstract : Global warming may trigger higher risk of biotic damage in forests because pest insects can quickly respond to increasing temperature through improved reproductive success. The present study aimed at studying the effect of warmer conditions on the population dynamics of Ips sexdentatus, the stenographer bark beetle. We performed breeding trials at six temperature regimes to determine the thermal requirements for complete development and we developed a model of degree-days to estimate the voltinism of the insect. We also tested the effects of temperature and breeding substrate on the number of offspring and their individual fitness. The minimum temperature threshold for I. sexdentatus development was estimated at 11±1°C, and the sum of degree-days at 517±52 DD. Adult developmental time required from 35 days at 25.5°C to 121 days at 15°C. On average, I. sexdentatus had two complete generations per year in Southern France over the past 17 years. The number of offspring per female exponentially increased with increasing temperature and volume of phloem whereas these variables had no influence on the sex ratio and individual beetle's fitness. This suggests that increasing temperatures would result in more generations per year and more offspring per generation and in consequence higher risk of bark beetle outbreaks.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2014_PETER_ZSUZSANNA.pdf
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Zsuzsanna Peter. Effect of climate change on population dynamics of bark beetles: relationships between temperature and development rate of Ips sexdentatus (Boern.) . Environmental Sciences. 2014. ⟨hal-01836196⟩

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