Moreno-Rueda Gregorio
Departamento de Biología Animal y Ecología, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, Spain.
Behav Processes. 2004 Sep 30;67(2):295-302. doi: 10.1016/j.beproc.2004.05.002.
It is known that breeding success in birds declines with an advance in the laying date. In this paper, breeding success diminished with laying date in a house sparrow (Passer domesticus) population breeding in captivity. The principal cause of the cline in breeding success with date was a decrease in the female feeding rate. The parental effort in females decreased with the advance of the laying date, although food access was ad libitum throughout the breeding season. Consequently, this cline in breeding success may be due to a reduced parental investment with the advance of the laying date or to exhaustion due to previous reproductive events in the season. Hypotheses usually used to explain the cline in breeding success with date can not explain results in this study.
众所周知，鸟类的繁殖成功率会随着产卵日期的提前而下降。在本文中，圈养繁殖的家麻雀（Passer domesticus）种群的繁殖成功率也随着产卵日期的提前而降低。繁殖成功率随日期变化呈梯度变化的主要原因是雌性喂食率的下降。尽管在整个繁殖季节食物供应充足，但雌性的亲代投入随着产卵日期的提前而减少。因此，繁殖成功率的这种梯度变化可能是由于随着产卵日期的提前亲代投资减少，或者是由于该季节之前的繁殖活动导致的体力耗尽。通常用于解释繁殖成功率随日期变化呈梯度变化的假设无法解释本研究的结果。
