Rockwell Robert F, Scott Findlay C, Cooke Fred
Department of Biology, The City College of New York, NY, USA.
Department of Biology, Queen's University at Kingston, Ontario, Canada.
Oecologia. 1983 Feb;56(2-3):318-322. doi: 10.1007/BF00379706.
In many species, fecundity is dependent on age. For some populations - particularly those exploiting temporally variable environments - these age-specific fecundities may themselves vary with time. In this report, we investigate the general effects of age and time on clutch size in a wild population of Lesser Snow Geese (Anser caerulescens caerulescens). We show that both factors affect clutch size independently. Age effects are confined almost exclusively to the two, three and four year old age classes. Mean clutch sizes of all age classes show considerable inter-seasonal variation. These temporal differences in fecundity will ultimately influence the dynamics of the population. In particular, they imply that there will be no convergence to a constant growth rate or a stable age distribution.
在许多物种中，繁殖力取决于年龄。对于一些种群——尤其是那些利用随时间变化的环境的种群——这些特定年龄的繁殖力本身可能会随时间而变化。在本报告中，我们研究了年龄和时间对小雪雁（Anser caerulescens caerulescens）野生种群窝卵数的总体影响。我们表明，这两个因素对窝卵数有独立影响。年龄影响几乎完全局限于二、三、四岁龄组。所有年龄组的平均窝卵数都表现出相当大的季节间差异。繁殖力的这些时间差异最终将影响种群动态。特别是，这意味着不会趋向于恒定的增长率或稳定的年龄分布。
