PCB-Associated Changes in mRNA Expression in Killer Whales (Orcinus orca) from the NE Pacific Ocean

2011 ◽  
Vol 45 (23) ◽  
pp. 10194-10202 ◽  
Author(s):  
Andrea H. Buckman ◽  
Nik Veldhoen ◽  
Graeme Ellis ◽  
John K. B. Ford ◽  
Caren C. Helbing ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Mrna Expression ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Ne Pacific

PBDEs, PBBs, and PCNs in Three Communities of Free-Ranging Killer Whales (Orcinus orca) from the Northeastern Pacific Ocean

2004 ◽  
Vol 38 (16) ◽  
pp. 4293-4299 ◽  
Author(s):  
Sierra Rayne ◽  
Michael G. Ikonomou ◽  
Peter S. Ross ◽  
Graeme M. Ellis ◽  
Lance G. Barrett-Lennard
Keyword(s):  
Pacific Ocean ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Northeastern Pacific ◽  
Free Ranging

Personality in captive killer whales (Orcinus orca): A rating approach based on the five-factor model.

2019 ◽  
Vol 133 (2) ◽  
pp. 252-261 ◽  
Author(s):  
Yulán Úbeda ◽  
Sara Ortín ◽  
Judy St. Leger ◽  
Miquel Llorente ◽  
Javier Almunia
Keyword(s):  
Factor Model ◽  
Five Factor Model ◽  
Orcinus Orca ◽  
Killer Whales

scholarly journals Family feud: permanent group splitting in a highly philopatric mammal, the killer whale (Orcinus orca)

2021 ◽  
Vol 75 (3) ◽  
Author(s):  
Eva H. Stredulinsky ◽  
Chris T. Darimont ◽  
Lance Barrett-Lennard ◽  
Graeme M. Ellis ◽  
John K. B. Ford
Keyword(s):  
Killer Whale ◽  
Group Structure ◽  
Group Living ◽  
Orcinus Orca ◽  
Learning Approaches ◽  
Killer Whales ◽  
Internal Factors ◽  
Individual Fitness ◽  
Leadership Experience

Abstract For animals that tend to remain with their natal group rather than individually disperse, group sizes may become too large to benefit individual fitness. In such cases, group splitting (or fission) allows philopatric animals to form more optimal group sizes without sacrificing all familiar social relationships. Although permanent group splitting is observed in many mammals, it occurs relatively infrequently. Here, we use combined generalized modeling and machine learning approaches to provide a comprehensive examination of group splitting in a population of killer whales (Orcinus orca) that occurred over three decades. Fission occurred both along and across maternal lines, where animals dispersed in parallel with their closest maternal kin. Group splitting was more common: (1) in larger natal groups, (2) when the common maternal ancestor was no longer alive, and (3) among groups with greater substructuring. The death of a matriarch did not appear to immediately trigger splitting. Our data suggest intragroup competition for food, leadership experience and kinship are important factors that influence group splitting in this population. Our approach provides a foundation for future studies to examine the dynamics and consequences of matrilineal fission in killer whales and other taxa. Significance statement Group living among mammals often involves long-term social affiliation, strengthened by kinship and cooperative behaviours. As such, changes in group membership may have significant consequences for individuals’ fitness and a population’s genetic structure. Permanent group splitting is a complex and relatively rare phenomenon that has yet to be examined in detail in killer whales. In the context of a growing population, in which offspring of both sexes remain with their mothers for life, we provide the first in-depth examination of group splitting in killer whales, where splitting occurs both along and across maternal lines. We also undertake the first comprehensive assessment of how killer whale intragroup cohesion is influenced by both external and internal factors, including group structure, population and group demography, and resource abundance.

Sounds associated with foraging and prey capture in individual fish-eating killer whales, Orcinus orca

2019 ◽  
Vol 146 (5) ◽  
pp. 3475-3486 ◽  
Author(s):  
Marla M. Holt ◽  
M. Bradley Hanson ◽  
Candice K. Emmons ◽  
David K. Haas ◽  
Deborah A. Giles ◽  
...  
Keyword(s):  
Prey Capture ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Individual Fish

scholarly journals Evaluating potential infectious disease threats for southern resident killer whales, Orcinus orca: a model for endangered species

2004 ◽  
Vol 117 (3) ◽  
pp. 253-262 ◽  
Author(s):  
Joseph K. Gaydos ◽  
Kenneth C. Balcomb ◽  
Richard W. Osborne ◽  
Leslie Dierauf
Keyword(s):  
Infectious Disease ◽  
Endangered Species ◽  
Orcinus Orca ◽  
Killer Whales

scholarly journals On sampling the upper crustal reservoir of the NE Pacific Ocean

Geofluids ◽  
2006 ◽  
Vol 0 (0) ◽  
pp. 060623055813001-??? ◽  
Author(s):  
H. P. JOHNSON ◽  
J. A. BAROSS ◽  
T. A. BJORKLUND
Keyword(s):  
Pacific Ocean ◽  
Ne Pacific
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