Dynamics of sibling aggression of a cichlid fish in Lake Tanganyika
Dynamics of sibling aggression of a cichlid fish in Lake Tanganyika
复制标题
坦噶尼喀湖慈鲷的同胞攻击行为动态
DOI：
10.1007/s10750-018-3768-8
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发表时间：
2019
期刊：
影响因子：
2.6
通讯作者：
Masanori Kohda
中科院分区：
文献类型：
--
作者：
Shun Satoh;Kazutaka Ota;Satoshi Awata;Masanori Kohda
兄弟姐妹经常争夺有限的资源，尤其是父母提供的食物。这种竞争通常是非暴力的，但在一些物种中已经进化出了直接的攻击。然而，在没有亲代供养的物种中，关于兄弟姐妹攻击的知识很少。在此，我们调查了赞比亚坦噶尼喀湖稚鱼科neolamprologus furciferin的同胞攻击行为。在这个物种中，雌性在巢中保护它们的后代，但不提供任何食物。早期的鱼苗在捕食浮游生物时没有表现出任何同胞攻击行为，但当它们在2周龄时开始捕食小底栖虾时，就开始表现出非致命的攻击行为。第7周，鱼苗密度显著下降，同胞攻击频率下降。通过补充喂养短期增加食物后，兄弟姐妹的攻击行为也减少了。尽管上午对虾的丰度较高，但攻击性在上午高于下午，当实验减少巢中对虾的数量时，攻击性降低。这些结果表明，食物的可获得性会影响没有表现出亲代供应的动物的兄弟姐妹攻击行为。
Siblings often compete for limited resources, particularly food provided by their parents. Such competition is usually nonviolent, but direct aggression has evolved in some species. However, there is little knowledge about sibling aggression in species without parental provisioning. Here, we investigated sibling aggression in the cichlidNeolamprologus furciferin Lake Tanganyika, Zambia. In this species, females guard their broods in the nest but do not provide any food. Early-stage fry did not show any sibling aggression while foraging on plankton, but began to show nonlethal aggression once they started to forage on small benthic shrimp at 2 weeks of age. The frequency of sibling aggression decreased at week 7, when the density of fry decreased remarkably. Sibling aggression also decreased following a short-term increase in food through supplemental feeding. The aggression was higher in the morning than in the afternoon despite higher abundance of shrimp at that time, and decreased when the number of shrimp in the nest was experimentally reduced. These results indicate that food availability affects sibling aggression of animals that do not exhibit parental provisioning.