Temperature-dependent Model of Life Cycle Development of Ips calligraphus (Coleoptera: Scolytidae)
| Autor: | W. Scott Fargo, Richard O. Flamm, Hsin-I Wu, Robert N. Coulson, Terence L. Wagner |
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| Rok vydání: | 1987 |
| Předmět: | |
| Zdroj: | Environmental Entomology. 16:497-502 |
| ISSN: | 1938-2936 0046-225X |
| Popis: | Constant temperatures from 12.5 to 37.5°C influenced duration of the within-tree life cycle (egg to adult emergence) of Ips calligraphus (Germar). The relationship of median development time and constant temperature formed a backwards J-shaped curve. On the average, developing I. calligraphus spent as little as 18 d in the host at 35°C and as much as 224 d in the host at 12.5°C. Frequency distributions of development times changed with temperature and were nearly uniform at 15°C, more symmetric at 20–3O°C, and somewhat skewed to the right at 32 and 35°C. The model of Sharpe & DeMichele (1977, J. Theor. Biol. 64: 649–670) described development rates (reciprocal of median times) as a function of temperature ( R 2 = 0.999), and a cumulative Weibull function (Wagner et al. [1984b, Ann. Entomol. Soc. Am. 77: 475–487]) described a single, temperature-independent distribution of normalized development times ( R 2 = 0.997). Combined, these functions predicted cumulative proportions of cohort emergence through time. Models were validated using a multiple-cohort simulation procedure (Wagner et al. [1985b, Ann. Entomol. Soc. Am. 78: 691–704]) as well as data on I. calligraphus emergence from three trees in each of three field plots. The validation suggested the model's suitability in a larger model of population dynamics. |
| Databáze: | OpenAIRE |
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