David Baldwin J, Dingle Hugh
Program in Evolutionary Ecology and Behavior, Department of Biology, University of Iowa, 52242, Iowa City, IA, USA.
Oecologia. 1986 Apr;69(1):64-71. doi: 10.1007/BF00399039.
Complete sets of life-history data (sufficient to construct life-tables and calculate intrinsic rates of increase) were collected at each of three constant temperatures for descendants of two tropical populations of the Large Milkweed Bug, Oncopeltus fasciatus. Although the two populations occur only about 60 km apart, they experience quite different thermal regimes, with little variation in mean monthly temperature at either site. In addition to the pronounced effect of ambient temperature on life-history traits, significant population-by-temperature interactions were observed for six of the eight traits examined. The data and the recent history of the species' distribution are consistent with the hypothesis that natural selection in the cool habitat has favored improved survival and increased reproduction at cool temperatures, with some trade-offs with respect to performance at higher (but ecologically relevant) temperatures.
在三个恒定温度下，分别收集了大型乳草蝽（Oncopeltus fasciatus）两个热带种群后代的完整生命史数据（足以构建生命表并计算内禀增长率）。尽管这两个种群仅相距约60公里，但它们经历的热环境截然不同，两个地点的月平均温度变化都很小。除了环境温度对生命史特征有显著影响外，在所研究的八个特征中，有六个观察到了显著的种群与温度的相互作用。这些数据以及该物种分布的近期历史与以下假设一致：凉爽栖息地的自然选择有利于在凉爽温度下提高存活率和增加繁殖率，同时在较高（但具有生态相关性）温度下的表现会有所权衡。
