scholarly journals Environmental change influences the life history of salmon Salmo salar in the North Atlantic Ocean

2016 ◽  
Vol 88 (2) ◽  
pp. 618-637 ◽  
Author(s):  
B. Jonsson ◽  
N. Jonsson ◽  
J. Albretsen
Keyword(s):  
Life History ◽  
Atlantic Ocean ◽  
Environmental Change ◽  
Salmo Salar ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
The North ◽  
History Of ◽  
The North Atlantic

scholarly journals III. The circulation of the surface waters of the north atlantic ocean

1901 ◽  
Vol 196 (274-286) ◽  
pp. 61-203 ◽  
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Surface Waters ◽  
Gulf Stream ◽  
North Atlantic Ocean ◽  
Critical Examination ◽  
Northern Latitude ◽  
The North ◽  
History Of ◽  
The North Atlantic

The history of our knowledge of the currents of the North Atlantic Ocean up to the year 1870 has been written once for all by Petermann (I), who in that year published a memoir maintaining, contrary to the opinion of Findlay, Blunt, and Carpenter, that eastern and northern extensions of the Gulf Stream were the prime factors in the circulation. Petermann subjected practically the whole of the material in the way of observations then extant to an exhaustive critical examination, and came to conclusions which are worth quoting, in the summary, inasmuch as the observations of the twenty succeeding years did not seriously modify them :— 1. The hot source and core of the Gulf Stream extends from the Strait of Florida, along the North American coast at all times.... up to the 37th degree of northern latitude.

scholarly journals Otolith chemistry as an indicator of movements of albacore (Thunnus alalunga) in the North Atlantic Ocean

2016 ◽  
Vol 67 (7) ◽  
pp. 1002 ◽  
Author(s):  
Igaratza Fraile ◽  
Haritz Arrizabalaga ◽  
Josu Santiago ◽  
Nicolas Goñi ◽  
Igor Arregi ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Life History ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
The North ◽  
Otolith Core ◽  
Thunnus Alalunga ◽  
The North Atlantic ◽  
Migratory Patterns

Albacore (Thunnus alalunga) in the North Atlantic Ocean is currently managed as a single well-mixed stock, although this assumption remains contentious. We measured stable isotopes (δ13C and δ18O) and trace elements (Mg, Mn, Sr, Ba) in otoliths of albacore collected from two feeding grounds, namely the Bay of Biscay and Atlantic offshore waters, and compared them among sampling locations and life history stages. Measurements in otolith core, post-core and edge were used to determine whether albacore from these two regions have the same nursery origin and migratory patterns. We found no clear evidence of distinct nursery grounds based on otolith core chemistry, but Sr:Ca and Mg:Ca were different in the post-core portions of albacore from the two locations, suggesting residency in different regions during the early juvenile stage. Otolith edge chemistry, particularly stable isotopes and Sr:Ca, proved to be a valuable tool for classifying individuals to their capture locations. Annual cycles of Sr:Ca ratios were visible along life history transects, likely reflecting migratory patterns between water masses of differing salinity, but the timing of Sr:Ca cycles differed between the two groups. Differentiation in trace element concentrations in the otolith post-core and the timing of Sr:Ca cycles suggest the occurrence of two migratory contingents of albacore in the north-east Atlantic Ocean.

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