| 来源类型 | Article |
| 规范类型 | 其他 |
| DOI | 10.3354/meps10580 |
| Temporal trends in age and size at maturation of four North Sea gadid species: Cod, haddock, whiting and Norway pout. | |
| Marty L; Rochet M-J; Ernande B | |
| 发表日期 | 2014 |
| 出处 | Marine Ecology Progress Series : 179-197 |
| 出版年 | 2014 |
| 语种 | 英语 |
| 摘要 | Younger ages and smaller sizes at maturation have been observed in commercial fish stocks over the last century. We establish that age and length at 50% proportion mature (i.e. the proportion of mature individuals in a population or the probability that an individual is mature) decreased from the 1970s to the 2000s in North Sea cod Gadus morhua, haddock Melanogrammus aeglefinus and whiting Merlangius merlangus, but not in Norway pout Trisopterus esmarkii. The potential contributions of demography, phenotypic plasticity and evolution to these trends were assessed. First, maturation trends were extricated from demographic effects and growth-dependent plasticity by estimating probabilistic maturation reaction norms (PMRNs). PMRN midpoints have significantly shifted downwards at most ages for cod, haddock and whiting, but not for Norway pout. Second, increased temperature and food abundance, loosened trophic competition and relaxed social pressure may also trigger growth-independent plasticity in maturation. Principal component regression of PMRN midpoints on annual estimates of relevant environmental variables exhibiting a temporal trend suggest that, despite some evidence of environmental effects, PMRN trends were mostly independent of growth-independent plasticity in haddock, whiting and male cod, but not in female cod. According to these findings, evolution of maturation, potentially in response to fishing, is plausible in haddock, whiting and male cod, but unlikely for Norway pout, and does not explain trends in female cod maturation. In agreement with life-history theory, the maturation response was larger in fast-growing, late- and large-maturing species exhibiting moderate reproductive effort. |
| 主题 | Evolution and Ecology (EEP) |
| 关键词 | Probabilistic maturation reaction norm Demography Phenotypic plasticity Fisheries-induced evolution Life-history strategy Maturity Growth Reproductive investment |
| URL | http://pure.iiasa.ac.at/id/eprint/10989/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 引用统计 | |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/130089 |
| 推荐引用方式 GB/T 7714 | Marty L,Rochet M-J,Ernande B. Temporal trends in age and size at maturation of four North Sea gadid species: Cod, haddock, whiting and Norway pout.. 2014. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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