Lambrechts M M, Blondel J, Maistre M, Perret P
Centre National de la Recherche Scientifique/CEFE, B.P. 1919 route de Mende, F-34-L93 Montpellier cedex 5, France.
Proc Natl Acad Sci U S A. 1997 May 13;94(10):5153-5. doi: 10.1073/pnas.94.10.5153.
Many proximate factors determine a bird's laying date, including environmental and social stimuli as well as individual responses to internal and external factors. However, the relative importance of these factors has not been experimentally demonstrated. Here we show that (i) large differences in the onset of first clutches between different populations result from variation in different responses to photoperiod and not from variation in responses to any other proximate factors and (ii) the same response mechanism causes maladaptive laying dates in habitats modified by humans. We present, to our knowledge, the first experimental demonstration that a single response mechanism is responsible for evolutionary adaptive intraspecific variation in a vertebrate life history trait.
许多近端因素决定鸟类的产卵日期，包括环境和社会刺激以及个体对内部和外部因素的反应。然而，这些因素的相对重要性尚未通过实验得到证实。在此我们表明：（i）不同种群首次产卵开始时间的巨大差异是由于对光周期的不同反应存在差异，而非对任何其他近端因素的反应存在差异；（ii）相同的反应机制在人类改造的栖息地中导致了不适应的产卵日期。据我们所知，我们首次通过实验证明，单一的反应机制是脊椎动物生活史特征中进化适应性种内变异的原因。
