Physical controls on the seasonal migration of the North Pacific transition zone chlorophyll front

2010 ◽  
Vol 115 (C5) ◽  
Author(s):  
Jennifer M. Ayers ◽  
M. Susan Lozier
Keyword(s):  
Transition Zone ◽  
North Pacific ◽  
Seasonal Migration ◽  
The North ◽  
Physical Controls ◽  
The North Pacific

Transoceanic migration rates of young North Pacific albacore, Thunnus alalunga, from conventional tagging data

2008 ◽  
Vol 65 (8) ◽  
pp. 1681-1691 ◽  
Author(s):  
Momoko Ichinokawa ◽  
Atilio L. Coan, ◽  
Yukio Takeuchi
Keyword(s):  
North Pacific ◽  
Seasonal Migration ◽  
Western Pacific ◽  
Migration Routes ◽  
Migration Rates ◽  
The North ◽  
Maximum Likelihood Methods ◽  
Westward Movement ◽  
Thunnus Alalunga ◽  
The North Pacific

This study summarizes US and Japanese historical North Pacific albacore ( Thunnus alalunga) tagging data and uses maximum likelihood methods to estimate seasonal migration rates of young North Pacific albacore. Previous studies related to North Pacific albacore migration have found that the frequency of albacore migrations is difficult to quantify because of inadequate amounts of tags released by the US tagging program in the western Pacific. Use of the combined Japan and US tagging data solves this problem. This study also incorporates specific seasonal migration routes, hypothesized in past qualitative analyses, to avoid overparameterization problems. The estimated migration patterns qualitatively correspond to those from previous studies and suggest the possibility of frequent westward movements and infrequent eastward movements in the North Pacific. This frequent westward movement of young albacore in the North Pacific would correspond to a part of albacore life history in which immature fish recruit into fisheries in the western and eastern Pacific and then gradually move near to their spawning grounds in the central and western Pacific before maturing.

Habitats of two albatross species during the non-breeding season in the North Pacific Transition Zone

2015 ◽  
Vol 162 (4) ◽  
pp. 743-752 ◽  
Author(s):  
Bungo Nishizawa ◽  
Daisuke Ochi ◽  
Hiroshi Minami ◽  
Kotaro Yokawa ◽  
Sei-Ichi Saitoh ◽  
...  
Keyword(s):  
Transition Zone ◽  
Breeding Season ◽  
North Pacific ◽  
The North ◽  
The North Pacific

scholarly journals Seasonal photoacclimation in the North Pacific Transition Zone

2021 ◽  
Author(s):  
Gregory L Britten ◽  
Christine Padalino ◽  
Gaël Forget ◽  
Michael J. Follows
Keyword(s):  
Transition Zone ◽  
North Pacific ◽  
The North ◽  
The North Pacific

scholarly journals Summertime Tintinnid Community in the Surface Waters Across the North Pacific Transition Zone

2021 ◽  
Vol 12 ◽  
Author(s):  
Haibo Li ◽  
Jun Xuan ◽  
Chaofeng Wang ◽  
Zhaohui Chen ◽  
Gérald Grégori ◽  
...  
Keyword(s):  
Transition Zone ◽  
North Pacific ◽  
Warm Water ◽  
Type I ◽  
Water Type ◽  
The North ◽  
Important Region ◽  
Oceanic Species ◽  
The Common ◽  
The North Pacific

Located from 35° to 45° latitude in both hemispheres, the transition zone is an important region with respect to the planktonic biogeography of the sea. However, to the best of our knowledge, there have been no reports on the existence of a tintinnid community in the transition zone. In this research, tintinnids along two transects across the North Pacific Transition Zone (NPTZ) were investigated in summer 2016 and 2019. Eighty-three oceanic tintinnid species were identified, 41 of which were defined as common oceanic species. The common oceanic species were further divided into five groups: boreal, warm water type I, warm water type II, transition zone, and cosmopolitan species. Undella californiensis and Undella clevei were transition zone species. Other species, such as Amphorides minor, Dadayiella ganymedes, Dictyocysta mitra, Eutintinnus pacificus, Eutintinnus tubulosus, Protorhabdonella simplex, and Steenstrupiella steenstrupii, were the most abundant in the NPTZ but spread over a much larger distribution region. Species richness showed no obvious increase in the NPTZ. Boreal, transition zone, and warm water communities were divided along the two transects. Tintinnid transition zone community mainly distributed in regions with water temperatures between 15 and 20°C. The tintinnid lorica oral diameter size classes were dominated by the 24–28 μm size class in three communities, but the dominance decreased from 66.26% in the boreal community to 48.85% in the transition zone community and then to 22.72% in the warm water community. Our research confirmed the existence of tintinnid transition zone species and community. The abrupt disappearance of warm water type I species below 15°C suggested that this group could be used as an indicator of the northern boundary of the NPTZ.

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