التفاصيل البيبلوغرافية
| العنوان: |
Maturation differences between sub-stocks of haddock, Melanogrammus aeglefinus. |
| المؤلفون: |
Wright, Peter, Tobin, Declan |
| المصدر: |
Marine Biology; Jan2013, Vol. 160 Issue 1, p231-239, 9p |
| مصطلحات موضوعية: |
HADDOCK, DEVELOPMENTAL biology, ANIMAL variation, ANIMAL genetics |
| مصطلحات جغرافية: |
NORTH Sea |
| مستخلص: |
Contemporary maturation schedules of North Sea haddock, Melanogrammus aeglefinus, differ between spawning centres east and west of the Greenwich meridian. In this study, young-of-the-year haddock from these two sub-stocks were raised under a common environment in order to test whether this sub-stock difference reflected temperature exposure during maturation or an intrinsic (presumed genetic) effect. Maturity-size relationships differed between sub-stocks for the same temperature, indicating an intrinsic component to the contemporary differences now found in the wild. Relative liver mass additionally explained some variation in the maturity-length relationships. Despite inhabiting a thermal regime more favourable for early maturation, west North Sea haddock had the lowest body size and liver mass at maturity for a given temperature. However, historic fishing effort was much higher in the west North Sea, suggesting that contemporary differences may reflect long-term differences in sub-stock mortality. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |