Svensson O, Magnhagen C, Forsgren E, Kvarnemo C
Department of Zoology, Uppsala University
Anim Behav. 1998 Jul;56(1):175-9. doi: 10.1006/anbe.1998.0769.
To investigate whether male common gobies, Pomatoschistus microps (Pisces, Gobiidae), treat their offspring differently depending on confidence of paternity, we conducted an experiment in which randomly chosen males either spawned alone with a female, or with a sneaking male present. Males did not treat their brood differently whether they had experienced sneaking or not. Our estimates of parental care, nest defence against potential egg predators and fanning rate were the same for the two treatments. Furthermore, there was no difference in filial cannibalism (eating their own progeny) between males that had been sneaked upon and males that had not. However, nest-guarding males that ate some of their brood had a smaller original brood area than other males. This suggests either an increase in paternal expenditure with increased brood size or a threshold value (absolute brood size or proportion of nest space covered) above which males do not cannibalize eggs. Copyright 1998 The Association for the Study of Animal Behaviour.
为了研究雄性欧洲黄盖鲽（Pomatoschistus microps，硬骨鱼纲，虾虎鱼科）是否会根据对父权的确信程度而区别对待其后代，我们进行了一项实验，随机挑选的雄性黄盖鲽要么与一只雌鱼单独产卵，要么在有一条偷情雄鱼在场的情况下产卵。无论雄鱼是否经历过偷情行为，它们对自己的鱼卵都没有区别对待。我们对两种情况下亲代抚育行为、针对潜在鱼卵捕食者的巢穴防御行为以及扇动鱼鳍频率的评估结果是相同的。此外，遭遇过偷情行为的雄鱼和未遭遇过偷情行为的雄鱼在同类相食（吃掉自己的后代）方面没有差异。然而，吃掉部分鱼卵的守巢雄鱼，其最初的鱼卵区域比其他雄鱼的要小。这表明要么随着鱼卵数量增加亲代投入增加，要么存在一个阈值（绝对鱼卵数量或巢穴空间覆盖比例），超过这个阈值雄鱼就不会同类相食鱼卵。版权所有1998动物行为研究协会。
