Causes and consequences of life-history variation in North American stocks of Pacific cod

<qd> Ormseth, O. A., and Norcross, B. L. 2009. Causes and consequences of life-history variation in North American stocks of Pacific cod. – ICES Journal of Marine Science, 66: 349–357. </qd>Life-history strategies of four Pacific cod ( Gadus macrocephalus ) stocks in the eastern North Pa...

Full description

Bibliographic Details
Published in:ICES Journal of Marine Science
Main Authors: Ormseth, Olav A., Norcross, Brenda L.
Format: Text
Language:English
Published: Oxford University Press 2009
Subjects:
ICES/PICES Early Career Scientists Symposium
Pacific
atlantic cod
Gadus morhua
Online Access:http://icesjms.oxfordjournals.org/cgi/content/short/66/2/349
https://doi.org/10.1093/icesjms/fsn156
Description
Summary:<qd> Ormseth, O. A., and Norcross, B. L. 2009. Causes and consequences of life-history variation in North American stocks of Pacific cod. – ICES Journal of Marine Science, 66: 349–357. </qd>Life-history strategies of four Pacific cod ( Gadus macrocephalus ) stocks in the eastern North Pacific Ocean are outlined. Southern stocks grew and matured quicker, but reached smaller maximum size and had shorter lifespans than northern stocks. The trade-offs resulted in similar lifetime reproductive success among all stocks. Growth was highly dependent on latitude, but not on temperature, possibly because of differences in the duration of the growing season. Comparisons with Atlantic cod ( Gadus morhua ) revealed similar latitude/growth relationships among Atlantic cod stocks grouped by geographic region. In Pacific cod, greater size and longevity in the north appeared to be adaptations to overcome environmental constraints on growth and to maintain fitness. An egg production-per-recruit model suggested that the life-history strategy of northern Pacific cod stocks made them less resilient to fishing activity and age truncation than southern stocks.

Similar Items