Rapidly changing life history during invasion
Identifieur interne : 000997 ( Main/Exploration ); précédent : 000996; suivant : 000998Rapidly changing life history during invasion
Auteurs : Thomas B Hn ; Odd Terje Sandlund ; Per-Arne Amundsen ; Raul PrimicerioSource :
- Oikos [ 0030-1299 ] ; 2004-07.
Abstract
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.
Url:
DOI: 10.1111/j.0030-1299.2004.13022.x
Affiliations:
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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.</div></front></TEI><affiliations><list></list><tree><noCountry><name sortKey="Amundsen, Per Rne" sort="Amundsen, Per Rne" uniqKey="Amundsen P" first="Per-Arne" last="Amundsen">Per-Arne Amundsen</name><name sortKey="B Hn, Thomas" sort="B Hn, Thomas" uniqKey="B Hn T" first="Thomas" last="B Hn">Thomas B Hn</name><name sortKey="Primicerio, Raul" sort="Primicerio, Raul" uniqKey="Primicerio R" first="Raul" last="Primicerio">Raul Primicerio</name><name sortKey="Terje Sandlund, Odd" sort="Terje Sandlund, Odd" uniqKey="Terje Sandlund O" first="Odd" last="Terje Sandlund">Odd Terje Sandlund</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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