Population structure of North Pacific gray whales in light of trans‐Pacific movements

2021 ◽  
Author(s):  
Aimée R. Lang ◽  
David W. Weller ◽  
Alexander M. Burdin ◽  
Kelly Robertson ◽  
Olga Sychenko ◽  
...  
Keyword(s):  
Population Structure ◽  
North Pacific ◽  
Gray Whales

Population Structure and Identification of North Pacific Ocean Chum Salmon (Oncorhynchus keta) Revealed by an Analysis of Minisateliite DNA Variation

1994 ◽  
Vol 51 (6) ◽  
pp. 1430-1442 ◽  
Author(s):  
Eric B. Taylor ◽  
Terry D. Beacham ◽  
Masahide Kaeriyama
Keyword(s):  
Population Structure ◽  
Pacific Ocean ◽  
North Pacific ◽  
Chum Salmon ◽  
North Pacific Ocean ◽  
Oncorhynchus Keta ◽  
The North ◽  
Yukon River ◽  
Regional Population ◽  
The North Pacific

We examined geographic variability in minisatellite DNA in chum salmon (Oncorhynchus keta) from 42 populations from the North Pacific Ocean to (1) determine the extent of regional population structure at minisatellite loci and (2) assess the ability of minisatellite variability to determine the geographic origin in individual chum salmon. Restriction fragments from 1.6 to 13.6 kilobase pairs in molecular weight were resolved with a minisatellite probe. The fragments were inherited from parent to offspring and appeared to represent segregation at two linked loci. Minisateliite DNA variability was negligible between annual samples from the same rivers, and chum salmon fell into three regional population groupings: (i) Japanese, (ii) Russian/Yukon River, and (iii) southeastern Alaska/British Columbia salmon. These regional groupings probably reflect historical patterns of postglacial dispersal of chum salmon from three distinct refugia in the North Pacific. We used restriction fragment counts as input to linear discriminant and neural network classification of independent test samples of salmon. Accuracies of 90–95, 81–86, and 72–80% were achieved when classifying fish as of either Japan/Russia/Yukon River versus southeastern Alaska/British Columbia origin, Japan versus Russia/Yukon River origin, or Russia versus Yukon River origin, respectively.

scholarly journals Insights into the population structure of blue whales in the Eastern North Pacific from recent sightings and photographic identification

2009 ◽  
Vol 25 (4) ◽  
pp. 816-832 ◽  
Author(s):  
John Calambokidis ◽  
Jay Barlow ◽  
John K. B. Ford ◽  
Todd E. Chandler ◽  
Annie B. Douglas
Keyword(s):  
Population Structure ◽  
North Pacific ◽  
Blue Whales

scholarly journals Migratory culture, population structure and stock identity in North Pacific beluga whales (Delphinapterus leucas)

PLoS ONE ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. e0194201 ◽  
Author(s):  
Greg O’Corry-Crowe ◽  
Robert Suydam ◽  
Lori Quakenbush ◽  
Brooke Potgieter ◽  
Lois Harwood ◽  
...  
Keyword(s):  
Population Structure ◽  
North Pacific ◽  
Delphinapterus Leucas ◽  
Beluga Whales

scholarly journals New fossil remains of the commensal barnacle Cryptolepas rhachianecti provide evidence of gray whales in the prehistoric South Pacific

2021 ◽  
pp. 1-8
Author(s):  
Larry Taylor ◽  
Juan Abella ◽  
Jorge Manuel Morales-Saldaña
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Evolutionary History ◽  
South Pacific ◽  
Isotopic Analysis ◽  
Gray Whale ◽  
Gray Whales ◽  
The North ◽  
The North Pacific ◽  
Historical Range

Abstract We report the finding of two partial specimens of Cryptolepas rhachianecti (Cirripedia, Coronulidae), a coronulid barnacle known only to inhabit the skin of gray whales (Eschrichtius robustus), in Pleistocene-aged sediments from the Canoa Basin, Ecuador. While the historical range of gray whales includes the North Pacific and North Atlantic, to our knowledge this is the first inferred evidence of a gray whale population having resided within the South Pacific. We describe the two Cryptolepas rhachianecti fossils, use isotopic analysis to investigate evidence of migration in their host whales, and discuss their implications for our understanding of gray whale evolutionary history.

scholarly journals Assessment of fecal steroid and thyroid hormone metabolites in eastern North Pacific gray whales

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Leila S Lemos ◽  
Amy Olsen ◽  
Angela Smith ◽  
Todd E Chandler ◽  
Shawn Larson ◽  
...  
Keyword(s):  
Thyroid Hormone ◽  
North Pacific ◽  
Reference Points ◽  
Future Research ◽  
Vital Rates ◽  
Baleen Whale ◽  
Gray Whales ◽  
Fecal Steroid ◽  
Metabolite Concentrations ◽  
The Impact

Abstract Baleen whale fecal samples have high potential for endocrine monitoring, which can be used as a non-invasive tool to identify the physiological response to disturbance events and describe population health and vital rates. In this study, we used commercial enzyme-linked immunosorbent assays to validate and quantify fecal steroid (progestins, androgens and glucocorticoids) and thyroid hormone metabolite concentrations in eastern North Pacific gray whales (Eschrichtius robustus) along the Oregon coast, USA, from May to October of 2016–2018. Higher mean progestin metabolite concentrations were observed in postweaning females, followed by pregnant females. Mean androgen, glucocorticoid and thyroid metabolites were higher in mature males. Progestin, glucocorticoids and thyroid fecal metabolites varied significantly by year, with positive correlations between progestin and androgen, and between glucocorticoid and thyroid metabolites. We also present two case studies of a documented injured whale and a mature male displaying reproductive competitive behavior, which provide reference points for physiologically stressed individuals and adult breeding males, respectively. Our methods and findings advance the knowledge of baleen whale physiology, can help guide future research on whale physiology and can inform population management and conservation efforts regarding minimizing the impact of anthropogenic stressors on whales.

scholarly journals Site-fidelity and spatial movements of western North Pacific gray whales on their summer range off Sakhalin, Russia

PLoS ONE ◽  
2020 ◽  
Vol 15 (8) ◽  
pp. e0236649 ◽  
Author(s):  
Koen C. A. Bröker ◽  
Glenn Gailey ◽  
Olga Yu. Tyurneva ◽  
Yuri M. Yakovlev ◽  
Olga Sychenko ◽  
...  
Keyword(s):  
North Pacific ◽  
Site Fidelity ◽  
Western North Pacific ◽  
Gray Whales ◽  
Summer Range

scholarly journals Population structure of North Atlantic and North Pacific sei whales (Balaenoptera borealis) inferred from mitochondrial control region DNA sequences and microsatellite genotypes

2018 ◽  
Vol 19 (4) ◽  
pp. 1007-1024 ◽  
Author(s):  
Léonie A. E. Huijser ◽  
Martine Bérubé ◽  
Andrea A. Cabrera ◽  
Rui Prieto ◽  
Mónica A. Silva ◽  
...  
Keyword(s):  
Population Structure ◽  
Control Region ◽  
North Atlantic ◽  
Dna Sequences ◽  
North Pacific ◽  
Mitochondrial Control Region
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