Is the recruitment a key biological process in the hypothetical NAO-Atlantic tunas relationships
Year: 2002
Type: article
Abstract: In the recent past, it has been put forward that recruitment of the North Atlantic albacore, East Atlantic bluefin tuna and North Atlantic swordfish could be related to the North AtlanticOscillation (NAO). In this document, the biological processes behind the NAO/recruitmentrelationship are further investigated. Then, the possible relationship between the East Atlanticbluefin tuna recruitment was re-investigated. The linear relationship appeared to be only due to\nthe low frequency signal, both BFT recruitment and NAO displaying a pseudo-cyclic upwardtrend, but year-to-year fluctuations were not synchronous. The superposed epoch analysis, thatwas conducted to test for possible non-linear and non-monotonous relationship did not reveal any clear connection. In conclusion, it appears that the available data on BFT recruitment cannot support the hypothesis of an impact of the NAO on BFT recruitment. Spatially\ndisaggregated data are needed to further investigate this hypothesis. Finally, we stressed the interest to explore other mechanisms, such as the influence of the NAO on spatial distribution, migration routes and catchability.
Author: Jean-marc Fromentin
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
SDG: Life below water
Open Access status: green
OpenAlex ID: W2144346324