Forage and migration habitat of loggerhead (Caretta caretta) and olive ridley (Lepidochelys olivacea) sea turtles in the central North Pacific Ocean

2004 ◽  
Vol 13 (1) ◽  
pp. 36-51 ◽  
Author(s):  
Jeffrey J. Polovina ◽  
George H. Balazs ◽  
Evan A. Howell ◽  
Denise M. Parker ◽  
Michael P. Seki ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
Sea Turtles ◽  
North Pacific Ocean ◽  
Caretta Caretta ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
And Migration ◽  
Central North Pacific

Single-nucleotide polymorphisms reveal distribution and migration of Chinook salmon (Oncorhynchus tshawytscha) in the Bering Sea and North Pacific Ocean

2013 ◽  
Vol 70 (1) ◽  
pp. 128-141 ◽  
Author(s):  
Wesley A. Larson ◽  
Fred M. Utter ◽  
Katherine W. Myers ◽  
William D. Templin ◽  
James E. Seeb ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Chinook Salmon ◽  
Bering Sea ◽  
North Pacific ◽  
Oncorhynchus Tshawytscha ◽  
North Pacific Ocean ◽  
Nucleotide Polymorphisms ◽  
Single Nucleotide ◽  
And Migration ◽  
The Bering Sea

We genotyped Chinook salmon (Oncorhynchus tshawytscha) from the Bering Sea and North Pacific Ocean for 43 single-nucleotide polymorphisms (SNPs) to investigate seasonal distribution and migration patterns. We analyzed 3563 immature fish from 22 spatiotemporal strata; composition analyses were performed using genotype data from spawning stocks spanning the species range. Substantial variation in stock composition existed among spatial and seasonal strata. We inferred patterns of seasonal migration based upon these data along with data from previous tag, scale, and parasite studies. We found that stocks from western Alaska and Yukon River overwinter on the Alaska continental shelf then travel to the middle and western Bering Sea during spring–fall. Stocks from California to Southeast Alaska were distributed in Gulf of Alaska year-round, with a substantial portion of this group migrating northward to the eastern Bering Sea during spring–fall. Proportions of Russian stocks increase when moving east to west in both the Bering Sea and North Pacific Ocean. These data can be used to better understand the impacts of fisheries and climate change on this valuable resource.

Variation in Prevalence of Nanophyetus salmincola, a Parasite Tag Indicating U.S. Northwest Origin, in Steelhead Trout (Oncorhynchus mykiss) Caught in the Central North Pacific Ocean

1991 ◽  
Vol 48 (6) ◽  
pp. 1104-1108 ◽  
Author(s):  
Timothy J. Dalton
Keyword(s):  
Pacific Ocean ◽  
Oncorhynchus Mykiss ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Relative Magnitude ◽  
Point Estimate ◽  
Infection Prevalence ◽  
Steelhead Trout ◽  
East West ◽  
Central North Pacific

Infections with the parasite "tag" Nanophyetus salmincola indicated that in 1986 and 1987, steelhead trout (Oncorhynchus mykiss) from the U.S. Northwest (Washington to northern California, including Idaho) were relatively abundant in the central North Pacific Ocean as far west as 165°E, about 5000–5500 km from their area of origin. Infection prevalence (the frequency of the presence of infection) was estimated annually for specimens stratified by 5°-longitude areas. East–west and north–south trends in prevalence occurred in 1986 but not in 1987. Correlation analysis indicated no between-year correlation in the relative magnitude of prevalence in areas sampled in both 1986 and 1987 (r = 0.017). Confidence intervals (90%) for overall annual prevalence in the central North Pacific Ocean steelhead population were 29.9–61.3% (point estimate = 45.4%) for 1986 and 43.3–63.0% (point estimate = 53.2%) for 1987.

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