| 来源类型 | Monograph (IIASA Interim Report) |
| 规范类型 | 报告 |
| The Logic of Skipped Spawning in Fish. | |
| Joergensen C; Ernande B; Fiksen O; Dieckmann U | |
| 发表日期 | 2005 |
| 出版者 | IIASA, Laxenburg, Austria: IR-05-066 |
| 出版年 | 2005 |
| 语种 | 英语 |
| 摘要 | That sexually mature fish skip reproduction has been documented in many species especially in response to poor condition. We present results from an energy-allocation life- history model that shed light on the underlying logic of skipped spawning, based on the Northeast Arctic stock of Atlantic cod (Gadus morhua). The model predicts that skipped spawning is a regular phenomenon, with up to 30% of the sexually mature biomass skipping spawning. Spawning should be skipped if the expected future gain in reproductive output, discounted by survival, more than balances the expected reproductive success the current year. Skipped spawning was most common 1) among potential second-time spawners and 2) early in life, 3) when fishing mortality at the spawning grounds was high, 4) when fishing mortality at the feeding grounds was low, 5) when natural mortality was low, and 6) when the energetic and mortality costs associated with migration and spawning were high. Cod skipped spawning more often both when food availability was increased (opportunities for better growth) and decreased (too little energy for gonad development), and this pattern interacted with mortality rate. We conclude that skipped spawning may be more widespread than appreciated, and highlight potential consequences for the understanding of stock-recruitment relationships. |
| 主题 | Adaptive Dynamics Network (ADN) |
| URL | http://pure.iiasa.ac.at/id/eprint/7776/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/125408 |
| 推荐引用方式 GB/T 7714 | Joergensen C,Ernande B,Fiksen O,et al. The Logic of Skipped Spawning in Fish.. 2005. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| IR-05-066.pdf（2480KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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