RATES OF FOOD-INTAKE AND AGGRESSION OF OYSTERCATCHERS HAEMATOPUS-OSTRALEGUS ON THE MOST AND LEAST PREFERRED MUSSEL MYTILUS-EDULIS BEDS OF THE EXE ESTUARY
RATES OF FOOD-INTAKE AND AGGRESSION OF OYSTERCATCHERS HAEMATOPUS-OSTRALEGUS ON THE MOST AND LEAST PREFERRED MUSSEL MYTILUS-EDULIS BEDS OF THE EXE ESTUARY
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DOI：
10.2307/4354
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发表时间：
1984-01-01
影响因子：
4.8
通讯作者：
DURELL, SEALD
中科院分区：
文献类型：
--
作者：
GOSSCUSTARD, JD;CLARKE, RT;DURELL, SEALD
本文研究了美洲斑潜蝇H.以贻贝M.将鸟类密度高的edulis床与鸟类密度低的最不喜欢的床上的鸟类行为进行比较。正如预测的那样，当成年鸟从7月至10月从繁殖地返回时，最先离开首选床的是攻击性最低的未成年鸟。攻击性的遭遇发生更频繁地在首选的床上比在最不喜欢的床上。有非常显着的差异，在最喜欢的床上喂养的个人之间的攻击性，但在低密度床上喂养的。摄入率显着相关性与侵略性在18个人的首选床，但不是在18个人研究的最不喜欢的床。这种差异可能主要是由于侵略的数量，特别是抢劫，床之间的差异。在最喜欢的床上，抢劫降低了摄入率的侵略性较低的鸟类和增强，最具侵略性的。在最不喜欢的床上，情况并非如此，因为相遇是如此罕见。结果进行了讨论的假设，牡蛎捕手竞争的一些贻贝床的执行。
The aggressive and feeding behavior of oystercatchers H. ostralegus feeding on preferred mussel M. edulis beds, where bird density was high, is compared with the behavior of birds feeding on the least preferred bed, where bird density was low. As predicted, it was the least aggressive of the immature birds that left the preferred beds first as the adults returned from the breeding grounds from July-Oct. The immatures that remained had similar aggression scores to adults. Aggressive encounters occurred much more frequently on the preferred beds than on the least preferred beds. There were highly significant differences in aggressiveness between individuals feeding on the most preferred beds, but not among those feeding on the low density bed. Intake rate was significantly correlated with aggressiveness among 18 individuals studied on the preferred beds but not among the 18 individuals studied on the least preferred bed. This difference probably was due mainly to the amount of aggression, particularly of robbing, differing between the beds. On the most preferred beds, robbing depressed the intake rate of the less aggressive birds and enhanced that of the most aggressive ones. This was not the case on the least preferred bed as encounters were so rare. The results are discussed in relation to the hypothesis that oystercatchers compete for some of the mussel beds on the Exe.