Basal metabolism of an adult male killer whale (Orcinus orca)

2013 ◽  
Vol 30 (3) ◽  
pp. 1229-1237 ◽  
Author(s):  
Graham A. J. Worthy ◽  
Tamara A. M. Worthy ◽  
Pamela K. Yochem ◽  
Christopher Dold
Keyword(s):  
Adult Male ◽  
Killer Whale ◽  
Basal Metabolism ◽  
Orcinus Orca ◽  
Male Killer

scholarly journals A White Killer Whale in the Central Aleutians

ARCTIC ◽  
2009 ◽  
Vol 61 (1) ◽  
pp. 102 ◽  
Author(s):  
Martin Renner ◽  
Kevin Bell
Keyword(s):  
Adult Male ◽  
Killer Whale ◽  
Individual Identification ◽  
Orcinus Orca ◽  
Dorsal Fin ◽  
The North ◽  
North Side ◽  
Bite Mark ◽  
Male Killer

We observed a white adult male killer whale (Orcinus orca) on 7 August 2000 off the north side of Adak Island, Aleutians. An open saddle and a rounded dorsal fin tip suggest that this whale belongs to the fish-eating (“resident”) ecotype. A circular scar matching a cookie-cutter shark (Isistius sp.) bite mark suggested that the animal originated in warmer waters. Photographs and description provided here should enable individual identification should this animal be seen again.

scholarly journals Records of a male killer whale (Orcinus orca) off Southeastern Brazil

2009 ◽  
Vol 57 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Marcos César de Oliveira Santos ◽  
Ednilson da Silva
Keyword(s):  
Killer Whale ◽  
Orcinus Orca ◽  
Southeastern Brazil ◽  
Male Killer

Sightings of an Adult Male Killer Whale Match Humpback Whale Breeding Seasons in Both Hemispheres in the Eastern Tropical Pacific

2019 ◽  
Vol 45 (3) ◽  
pp. 320-326 ◽  
Author(s):  
Aldo S. Pacheco ◽  
Cristina Castro ◽  
Romina Carnero-Huaman ◽  
Damian Villagra ◽  
Santiago Pinilla ◽  
...  
Keyword(s):  
Adult Male ◽  
Killer Whale ◽  
Humpback Whale ◽  
Tropical Pacific ◽  
Eastern Tropical Pacific ◽  
Breeding Seasons ◽  
Male Killer

Androgen and glucocorticoid production in the male killer whale (Orcinus orca): influence of age, maturity, and environmental factors

Andrology ◽  
2016 ◽  
Vol 5 (1) ◽  
pp. 180-190 ◽  
Author(s):  
J. K. O'Brien ◽  
K. J. Steinman ◽  
G. A. Fetter ◽  
T. R. Robeck
Keyword(s):  
Environmental Factors ◽  
Killer Whale ◽  
Orcinus Orca ◽  
Glucocorticoid Production ◽  
Male Killer

Characterization of male killer whale (Orcinus orca) sexual maturation and reproductive seasonality

2006 ◽  
Vol 66 (2) ◽  
pp. 242-250 ◽  
Author(s):  
T.R. Robeck ◽  
S.L. Monfort
Keyword(s):  
Sexual Maturation ◽  
Killer Whale ◽  
Orcinus Orca ◽  
Reproductive Seasonality ◽  
Male Killer

Killer whales (Orcinus orca) attack and kill a Bryde's whale (Balaenoptera edeni)

1990 ◽  
Vol 68 (7) ◽  
pp. 1603-1606 ◽  
Author(s):  
Gregory K. Silber ◽  
Michael W. Newcomer ◽  
Héctor Pérez-Cortés M.
Keyword(s):  
Adult Male ◽  
Gulf Of California ◽  
Orcinus Orca ◽  
Adult Males ◽  
Killer Whales ◽  
Lower Jaw ◽  
Large Wound ◽  
The Right ◽  
Male Killer

On 3 May 1988, we observed a group of killer whales that pursued, killed, and partially consumed a Bryde's whale in the northern Gulf of California, Mexico (31°01′N, 114°15′W). The attack was observed from 06:54 to 08:53 while circling in a single-engine aircraft at an altitude of 160 m. The group comprised about 15 killer whales, including two adult males and at least two calves. Females and (or) subadult males pressed the attack most intently. The killer whales tore skin and blubber from the right flank of the Bryde's whale, and on 11 occasions the killer whales swam onto the head or back of the Bryde's whale, which hindered its breathing. The respiration intervals of the Bryde's whale were short and irregular, and blow rates differed significantly from those of undisturbed Bryde's whales. Fatiguing the whale may have facilitated an easier kill by asphyxiation. After the death of the Bryde's whale, the two adult male killer whales surfaced slowly about 200–300 m away from the remainder of the group, which presumably fed on the submerged Bryde's whale carcass. Two days later, the drifting Bryde's whale carcass was located. A large wound was visible on the abdomen, and sections of the lower jaw had been removed. Like those of canids and some felids that hunt cooperatively when preying on ungulates, attacks by Orcinus orca exhibit coordination of activities and efficiency in dispatching prey.

Surface-Based Observations Can Be Used to Assess Behavior and Fine-Scale Habitat Use by an Endangered Killer Whale (Orcinus orca) Population

2016 ◽  
Vol 42 (2) ◽  
pp. 168-183 ◽  
Author(s):  
Dawn P. Noren ◽  
Donna D. W. Hauser
Keyword(s):  
Habitat Use ◽  
Killer Whale ◽  
Orcinus Orca ◽  
Fine Scale

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.

Captive killer whale ( Orcinus orca ) survival

2015 ◽  
Vol 31 (4) ◽  
pp. 1362-1377 ◽  
Author(s):  
John Jett ◽  
Jeffrey Ventre
Keyword(s):  
Killer Whale ◽  
Orcinus Orca

scholarly journals Visual discrimination learning in the killer whale (Orcinus orca)

1971 ◽  
Vol 3 (4) ◽  
pp. 187-188 ◽  
Author(s):  
Don White ◽  
Paul Spong ◽  
Norm Cameron ◽  
John Bradford
Keyword(s):  
Discrimination Learning ◽  
Visual Discrimination ◽  
Killer Whale ◽  
Orcinus Orca ◽  
Visual Discrimination Learning
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