Are thermal constants constant? A test using two species of ladybird
Language English Country England, Great Britain Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
24556254
DOI
10.1016/j.jtherbio.2013.12.001
PII: S0306-4565(13)00133-2
Knihovny.cz E-resources
- Keywords
- Degree days, Food quality, Linear phase of development, Lower developmental threshold, Menochilus sexmaxculatus, Propylea dissecta,
- MeSH
- Coleoptera growth & development MeSH
- Diet MeSH
- Hemiptera growth & development MeSH
- Hot Temperature * MeSH
- Animals MeSH
- Check Tag
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
There is a controversy about whether the thermal constants, lower developmental threshold, rate of development and corresponding degree days required for development, change when a species is reared under different developmental conditions. We present a more precise way of measuring these constants using the linear relationship between the rate of development and temperature. First we use the equation proposed by Ikemoto and Takai (2000) to determine the linear phase of development and then a generalised linear model having a different variance at low and high temperatures, specific for each condition, to estimate the parameters of the linear relationship. Using this method, we show that providing the difference in food quality is sufficiently great, an aphidophagous ladybird develops significantly faster and starts developing at a significantly lower temperature on a good than on a poor quality diet. Adaptive significance of the thermal constants not remaining constant is discussed in terms of a trade-off between growth and rate of development, when temperature and food quality varies.
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