Stock-environment recruitment models for Norwegian spring spawning herring (Clupea harengus)

Content Provider	Semantic Scholar
Author	Fiksen, Øyvind Slotte, Aril
Copyright Year	2002
Abstract	Different stock-environment recruitment models for Norwegian spring spawning herring (Clupea harengus) are fitted to a time series of spawning stock, recruitment, and temperature data extending back to 1907. In addition to the traditional temperature index from the Barents Sea (the average annual temperature in the Kola transect), we also developed a new index based on the temperature in the larval drift trajectories during early larval life. The models show highly significant effects of both spawning stock and temperature. The inclusion of the temperature term in the stock-recruitment models removes the autocorrelation from the residuals and improves their explanatory ability by 6-9%. We explore the interdependence between recruitment success and subsequent spawning stock biomass and conclude that this is not likely to generate the stock-recruitment relationship. Our analysis suggests that the collapse of the Norwegian spring spawning herring stock in the period 1950-1970 was not caused by reduced recruitment, but by the drop in spawning stock biomass induced by the increased fisheries in this period. Resume : Divers modeles de stock-recrutement relies a l'environnement appliques a des harengs norvegiens a repro- duction printaniere (Clupea harengus) sont ajustes ici a des series temporelles de donnees remontant a 1907 sur les stocks des geniteurs, le recrutement et la temperature. En plus du coefficient traditionnel de temperature dans la mer de Barents (la temperature annuelle moyenne sur le transect de Kola), nous avons cree un nouvel indice base sur la temperature le long des trajectoires de derive des larves au cours du debut de leur vie. L'insertion du terme de temperature dans les modeles de stock-recrutement enleve l'autocorrelation des rediduels et ameliore le potentiel explicatif des modeles de 6-9 %. Un examen de l'interdependance entre le succes du recrutement et la biomasse subsequente du stock des geniteurs nous amene a conclure que ce n'est vraisemblablement pas ce qui genere la relation stock-recrutement. Notre analyse laisse croire que l'effondrement du stock norvegien de harengs a reproduction printaniere dans la periode 1950-1970 n'est pas du a une reduction du recrutement, mais a une diminution de la masse du stock des geniteurs a cause de l'accroissement des activites de peche a cette epoque. (Traduit par la Redaction) Fiksen and Slotte 217
Starting Page	211
Ending Page	217
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1139/f02-002
Volume Number	59
Alternate Webpage(s)	http://bio.uib.no/te/papers/Fiksen_2002_Stock_environment.pdf
Alternate Webpage(s)	https://doi.org/10.1139/f02-002
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article