Migration timing and distance from shore of southbound eastern Pacific gray whales (Eschrichtius robustus) off Ensenada, Baja California, Mexico

2013 ◽  
Vol 30 (2) ◽  
pp. 674-690 ◽  
Author(s):  
Melba De Jesús ◽  
Gisela Heckel ◽  
Jeffrey M. Breiwick ◽  
Stephen B. Reilly
Keyword(s):  
Baja California ◽  
Eastern Pacific ◽  
Eschrichtius Robustus ◽  
Gray Whales ◽  
Migration Timing

Using two drones to simultaneously monitor visual and acoustic behaviour of gray whales (Eschrichtius robustus) in Baja California, Mexico

2020 ◽  
Vol 525 ◽  
pp. 151321 ◽  
Author(s):  
Héloïse Frouin-Mouy ◽  
Ludovic Tenorio-Hallé ◽  
Aaron Thode ◽  
Steven Swartz ◽  
Jorge Urbán
Keyword(s):  
Baja California ◽  
Eschrichtius Robustus ◽  
Gray Whales ◽  
Acoustic Behaviour

Diurnal and Seasonal Acoustic Trends in Northward Migrating Eastern Pacific Gray Whales (Eschrichtius robustus)

2018 ◽  
Vol 44 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Lynn Rannankari ◽  
Rianna E. Burnham ◽  
David A. Duffus
Keyword(s):  
Eastern Pacific ◽  
Eschrichtius Robustus ◽  
Gray Whales

Comparative swimming effort of migrating gray whales (Eschrichtius robustus) and calf cost of transport along Costa Azul, Baja California, Mexico

2008 ◽  
Vol 86 (4) ◽  
pp. 307-313 ◽  
Author(s):  
S. Rodríguez de la Gala-Hernández ◽  
G. Heckel ◽  
J. L. Sumich
Keyword(s):  
Baja California ◽  
Swimming Velocity ◽  
Eschrichtius Robustus ◽  
Cost Of Transport ◽  
Gray Whales

Swimming velocities and breathing rates were measured for migrating gray whales ( Eschrichtius robustus (Lilljeborg, 1861)) at Costa Azul, Baja California, to compare swimming effort of southbound whales, northbound whales without calves, and northbound mothers and calves. From December 2004 to May 2005, whales were followed using a theodolite to determine swimming velocity. Binoculars were used to count whale blows and their timings were recorded to determine breathing rates. Individual whale breathing rates (BR) were divided by their swimming velocity (V) to derive a comparative index of swimming effort in units of breaths per kilometre. There were significant differences in mean BR, V, and swimming effort among the three migrating groups (p < 0.05). Southbound migrating whales averaged a swimming effort of 7.4 breaths·km–1 (V = 1.9 m·s–1, BR = 0.8 breaths·min–1). Northbound whales without calves showed the lowest swimming effort of the three migrating groups (4.7 breaths·km–1, V = 1.8 m·s–1, BR = 0.5 breaths·min–1). Northbound mothers and calves had the same swimming velocity (V = 1.2 m·s–1), but BR and swimming effort were calculated separately yielding a swimming effort of 7.6 breaths·km–1 (BR = 0.5 breaths·min–1) for mothers and 10.1 breaths·km–1 (BR = 0.7 breaths·min–1) for calves. Cost of transport was calculated for northbound calves, yielding a range based on 1.5% and 3% tidal volumes of 0.25–0.34 and 0.51–0.58 J·kg–1·m–1, respectively.

First Photographic Match of an Anomalously White Gray Whale (Eschrichtius robustus) in the Northeastern Chukchi Sea, Alaska, and Baja California, Mexico

2018 ◽  
Vol 44 (1) ◽  
pp. 7-12
Author(s):  
Amy L. Willoughby ◽  
Megan C. Ferguson ◽  
Janet T. Clarke ◽  
Amelia A. Brower
Keyword(s):  
Baja California ◽  
Chukchi Sea ◽  
Gray Whale ◽  
Eschrichtius Robustus

New Record of Atypical Coloration in a Gray Whale Calf (Eschrichtius robustus) in Laguna Ojo de Liebre, Baja California Sur, Mexico

2017 ◽  
Vol 43 (6) ◽  
pp. 644-648
Author(s):  
César A. Salinas-Zavala ◽  
María V. Morales-Zárate ◽  
Andrés González-Peralta ◽  
Rosa J. Aviña-Hernández ◽  
Mariana L. Muzquiz-Villalobos
Keyword(s):  
New Record ◽  
Baja California ◽  
Gray Whale ◽  
Baja California Sur ◽  
Eschrichtius Robustus
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