Département de biologie, Université Laval, G1K 7P4, Ste-Foy, PQ, Canada.
J Chem Ecol. 1992 Oct;18(10):1797-807. doi: 10.1007/BF02751104.
Different-agedPseudaletia unipuncta (Haworth) males, maintained as adults at 10 and 25°C under 16∶8 and 12∶12 light-dark photoperiodic regimes, were flown to a 30-μg pheromone source in a wind tunnel at 20°C. While the responsiveness of individuals reared under both photoperiodic conditions at 25 °C was similar by day 5 (65-75%), response levels of younger males showed that those reared at 16∶8 light-dark matured more rapidly than those under 12∶12 light-dark. A significant delay in the onset of responsiveness was observed for males reared under 10°C with less than 25% of individuals responding to the pheromone, even at 25 days old. At this temperature, photoperiodic conditions had no significant effect on male receptivity. When males are transferred from 10°C to 25°C 16∶ 8 light-dark, their level of responsiveness after five days was similar to control 5-day-old males reared at 25°C, 16∶8 light-dark. These results are discussed relative to the hypothesis that this species migrates in response to seasonal cues that indicate a predictable habitat deterioration.
不同年龄的美洲玉米螟雄虫，在 10°C 和 25°C 下分别以 16∶8 和 12∶12 的光暗周期饲养为成虫，在 20°C 的风洞中飞向 30-μg 的信息素源。在 25°C 下，两种光周期条件下饲养的个体在第 5 天（65-75%）的反应性相似，但年轻雄虫的反应水平表明，16∶8 光暗条件下饲养的雄虫比 12∶12 光暗条件下饲养的雄虫成熟得更快。在 10°C 下饲养的雄虫对信息素的反应明显延迟，即使在 25 天大时，也有不到 25%的个体对信息素产生反应。在这个温度下，光周期条件对雄虫的接受度没有显著影响。当雄虫从 10°C 转移到 25°C 16∶8 光暗时，它们五天后的反应水平与在 25°C 16∶8 光暗下饲养的 5 天大的对照雄虫相似。这些结果与该物种对季节性提示做出反应以迁移的假设有关，这些提示表明栖息地可预测的恶化。
