FOOD SHORTAGE INFLUENCES SIBLING AGGRESSION IN THE BLUE-FOOTED BOOBY
FOOD SHORTAGE INFLUENCES SIBLING AGGRESSION IN THE BLUE-FOOTED BOOBY
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DOI：
10.1016/0003-3472(89)90065-1
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发表时间：
1989-05-01
期刊：
影响因子：
2.5
通讯作者：
CHAVELAS, CG
中科院分区：
文献类型：
--
作者：
DRUMMOND, H;CHAVELAS, CG
在蓝脚鲣鸟苏拉nebouxii中，第一只孵化的雏鸟有时会在最初的几周内消灭它的配偶，因为食物短缺。为了检验这一假设（基于描述性数据），即兄弟姐妹的攻击性随着食物的剥夺而增加，当年长的鸡的体重低于潜在的20-25%时，这种攻击性会加剧，两只鸡的脖子都被绑住以抑制摄食，并将行为与对照组进行比较。在剥夺，啄增加，急剧上升时，老年人在大约提出的重量阈值;乞讨增加，老年人可能会抑制乞讨的晚辈;和在年轻的育雏（小于6周龄）的资深鸡的喂养优势增加37%至57%，更多的尝试父母饲料比它的兄弟姐妹在剥夺。啄食率在年轻的育雏比在老育雏，差异喂养是不存在的，和食物剥夺啄食的效果随着年龄的增长，在第一个6周，随后下降，随着年龄的增长。这些与年龄有关的变化可能部分是由于步行能力的发展改善，使年龄较大的青少年能够逃避攻击。当剥夺结束时，啄食、乞讨和进食倾向于恢复到基线值，这意味着一个可逆的机制。高级小鸡的攻击倾向似乎受到传递给育雏的食物量的影响，这种影响可能由小鸡的营养状况或饥饿介导。
In the blue-footed booby, Sula nebouxii, the first-hatched chick sometimes eliminates its brood-mate in the first few weeks, when food is short. To test the hypothesis (based on descriptive data) that sibling aggression increases with food deprivation and intensifies when the senior chick''s weight is 20-25% below potential, both chicks'' necks were taped to inhibit ingestion and behaviour was compared with controls. Under deprivation, pecking increased, rising steeply when seniors were at roughly the proposed weight threshold; begging increased, with seniors possibly suppressing begging of juniors; and in young broods (less than 6 weeks old) the senior chick''s feeding advantage increased from 37 to 57% more attempted parental feeds than its sibling during deprivation. Pecking rates were more than three times higher in young broods than in old broods, where differential feeding was absent, and the effect of food deprivation on pecking increased with age in the first 6 weeks and subsequently declined with age. These age-related changes may be partly due to developmental improvement in walking ability, enabling older juniors to evade aggression. When deprivation ended, pecking, begging and feeding tended to return to baseline values, implying a reversible mechanism. The aggressive tendency of the senior chick appears to be influenced by the amount of food delivered to the brood, an effect possibly mediated by the chick''s nutritional condition or hunger.