| 来源类型 | Conference or Workshop Item (UNSPECIFIED)
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| 规范类型 | 其他
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| Dynamics in frequency of skipped reproduction in Norwegian spring-spawning herring. |
| Engelhard GH; Heino M
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| 发表日期 | 2004
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| 出处 | ICES CM Documents 2004 - ICES Annual Science Conference, 22-25 September 2004
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| 出版年 | 2004
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| 语种 | 英语
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| 摘要 | A common presumption in fisheries science is that adult iteroparous fish, once matured, typically spawn in all consecutive years. Recent evidence suggests, however, that skipping of reproduction occurs more commonly than is usually believed. Adult Norwegian spring-spawning herring (Clupea harengus) undertake long annual migrations between feeding, overwintering, and spawning areas. Analysis of extensive historical data on scales suggested that, on average, almost one in two herring may skip their second spawning migration. Moreover, the frequency of skipping may vary considerably from year to year. Based on annual variations in skipped reproduction, relationships are examined here between the mean weight and condition of spawning herring in a given year, and the fraction of fish skipping the second reproductive season in the following year. Environmental influences on skipping are examined based on indices of annual temperature and zooplankton abundance in the Norwegian Sea. The results corroborate with the hypothesis that skipped reproduction results from trade-offs between current and future reproduction, growth and survival: participation in distant, energetically costly and risky spawning migrations may only pay off in terms of fitness if individuals are sufficiently large and in sufficient condition to both successfully migrate and spawn. |
| 主题 | Adaptive Dynamics Network (ADN)
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| 关键词 | Herring
Sild
Reproduction
Reproduksjon
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| URL | http://pure.iiasa.ac.at/id/eprint/7360/
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| 来源智库 | International Institute for Applied Systems Analysis (Austria)
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| 资源类型 | 智库出版物
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| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/132147
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推荐引用方式
GB/T 7714 |
Engelhard GH,Heino M. Dynamics in frequency of skipped reproduction in Norwegian spring-spawning herring.. 2004.
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