Rapidly changing life history during invasion

被引:147
作者
Bohn, T [1 ]
Sandlund, OT
Amundsen, PA
Primicerio, R
机构
[1] Norwegian Inst Gene Ecol, Sci Pk,POB 6418, NO-9294 Tromso, Norway
[2] Univ Tromso, Norwegian Coll Fishery Sci, NO-9037 Tromso, Norway
[3] Norwegian Inst Nat Res, NO-7485 Trondheim, Norway
关键词
D O I
10.1111/j.0030-1299.2004.13022.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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.
引用
收藏
页码:138 / 150
页数:13
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