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- W3006771872 abstract "1. Climate effects on plant defences, and subsequently insect herbivores, have received considerable attention. However, climate also directly affects the physiological condition of insects that may influence their ability to combat plant defences. 2. This study tested the effects of body fat and water content on the ability of mountain pine beetles, Dendroctonus ponderosae Hopkins, to tolerate monoterpenes, the primary defences of their host pine trees. To manipulate their physiological condition, we exposed beetles to one of three environmental treatments: cold (4 °C, 30% RH), humid (21 °C, 70% RH) or dry (21 °C, 30% RH). Beetles had the highest fat and water content in the cold treatment, followed by lower fat but the same water content in the humid treatment, and the lowest of both in the dry treatment . Following environmental treatments, beetles were exposed to 0, 312.5 or 625 ppm vapours of monoterpenes (−)‐α‐pinene or ( R )‐(+)‐limonene. 3. Survival during both environmental and monoterpene treatments was highest for the cold treatment, less for the humid treatment, and lowest for the dry treatment. Fat and water content positively predicted survival. In response to increasing monoterpene concentration, survival, body condition and water content, but not fat, declined. 4. These results indicate that water content of insect herbivores was important for the realised toxicity of plant defences, presumably due to the process of excreting detoxified compounds. Energetic costs of detoxification were less evident. Dehydration of insects has not been widely considered in insect–plant interactions, but effects of climate change on humidity may become increasingly important for these interactions." @default.
- W3006771872 created "2020-03-06" @default.
- W3006771872 creator A5040920892 @default.
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- W3006771872 date "2020-02-18" @default.
- W3006771872 modified "2023-09-27" @default.
- W3006771872 title "Realised toxicity of plant defences to an insect herbivore depends more on insect dehydration than on energy reserves" @default.
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- W3006771872 doi "https://doi.org/10.1111/een.12851" @default.
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