Rapidly changing life history during invasion
Rapidly changing life history during invasion
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DOI：
10.1111/j.0030-1299.2004.13022.x
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发表时间：
2004-07-01
期刊：
影响因子：
3.4
通讯作者：
Primicerio, R
中科院分区：
文献类型：
--
作者：
Bohn, T;Sandlund, OT;Primicerio, R
20世纪80年代后半期，旺迪斯鱼（Coregonus albula）入侵亚北极帕斯维克水道，并在几年内成为该水道上游的优势中上层鱼类。对1991-2000年巴斯维克地区旺迪斯先锋种群的生活史特征进行了记录。河道上游种群密度迅速增加，生长率下降，繁殖力下降，初成熟时体型减小。河道下游与上游相比，表现出相似的、但较晚的生活史特征变化。该研究记录了一种非本地鱼类进入新环境的巨大生活史变异性。我们讨论了对观察到的模式的两种共同作用的解释：(i)由食物消耗介导的密度依赖性反应；（ii）一种先锋策略，将资源分配给具有大量后代的早期发育阶段的繁殖，以牺牲后代的生长和大小为代价。
The fish species vendace (Coregonus albula) invaded the sub-arctic Pasvik watercourse during the second half of the 1980s, and became the dominant pelagic species in the upstream part of the watercourse within a few years. Life history traits of the pioneer population of vendace in Pasvik were recorded from 1991-2000. A rapid increase in population density in the upstream part of the watercourse was accompanied by decreased growth rates, decreased fecundity and a reduced size at first maturation. The downstream part of the watercourse showed a similar, but delayed, change in life history traits compared to the upstream part. The study documents great life history variability of a non-native fish species entering a new environment. We discuss two co-acting explanations for the observed patterns: (i) a density dependent response mediated by food depletion; and (ii) a pioneer strategy that allocates resources to favour reproduction at early developmental stages with a high number of offspring, trading off growth and size of offspring.