Social dominance, prior residence and the acquisition of profitable feeding sites in juvenile Atlantic salmon
Social dominance, prior residence and the acquisition of profitable feeding sites in juvenile Atlantic salmon
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大西洋鲑鱼幼鱼的社会支配地位、先前居住地和有利可图的饲养场所的收购
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
C. Garica Leaniz
中科院分区：
文献类型：
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作者：
F. A. Huntigford;C. Garica Leaniz
12组10大西洋鲑鱼萨尔莫salar parr筛选优势，在小坦克与一个单一的本地化的食物来源，使用一系列的去除方法和顶部，中间和底部的两个鱼在每个组被归类为高，中，低的社会地位，分别。这72个排名的鱼被称重，并形成四个组或波，每个组或波由每个状态类别的六条鱼组成。根据状态和波浪给鱼染色标记，然后在12天内分四波引入人工溪流。在2个月的时间内记录的定居/移民模式，在结束时，从流中取出的鱼，确定和重新称重，并计算每日特定的增长率。51条鱼在水槽中建立了喂食站，其余的通过下游的陷阱迁移。两个月期间的平均增长率为0.87%天-1。定居的概率和增长率定居后显着较高的鱼类从早期的波。相比之下，鲑鱼占主导地位，在最初的试验是不太可能比下属鱼类解决在实验流，并表现出较低的postsettlement增长率。鱼有个别一致的行为配置文件，促进在不同的竞争环境中取得成功的可能性进行了讨论，参考其他群体发表的文献。在主要实验结束时进行的小规模试验证实了先前的驻留效应，并证明1天足以使这种效应变得明显。
Twelve groups of 10 Atlantic salmon Salmo salar parr were screened for dominance in small tanks with a single localized food source using a serial removal method and the top, middle and bottom two fish in each group were classified as high, medium and low social status, respectively. These 72 ranked fish were weighed and formed into four groups or waves, each consisting of six fish of each status category. The fish were given dye marks according to status and wave and were then introduced into an artificial stream in four waves over a 12-day period. Patterns of settlement/emigration were recorded over a 2-month period, at the end of which the fish were removed from the stream, identified and reweighed, and daily specific growth rates calculated. Fifty-one fish established feeding stations in the flume, the remainder emigrating via a downstream trap. The average growth rate over the 2-month period was 0·87% day−1. Probability of settlement and growth rates following settlement were significantly higher in fish from the earlier waves. In contrast, salmon that were dominant in the initial trial were less likely than subordinate fish to settle in the experimental stream and showed lower postsettlement growth rates. The possibility that fish have individually consistent behavioural profiles that promote success in different competitive environments is discussed with reference to published literature for other groups. A small-scale trial at the end of the main experiment confirmed the prior residence effect and demonstrated that 1 day was sufficient for such an effect to be evident.