scholarly journals Abundance, survival and population growth of killer whales Orcinus orca at subantarctic Marion Island

2020 ◽  
Vol 2020 (4) ◽  
Author(s):  
Rowan K. Jordaan ◽  
W. Chris Oosthuizen ◽  
Ryan R. Reisinger ◽  
P. J. Nico De Bruyn
Keyword(s):  
Population Growth ◽  
Orcinus Orca ◽  
Marion Island ◽  
Killer Whales

scholarly journals Variation in the diet of killer whales Orcinus orca at Marion Island, Southern Ocean

2016 ◽  
Vol 549 ◽  
pp. 263-274 ◽  
Author(s):  
RR Reisinger ◽  
DR Gröcke ◽  
N Lübcker ◽  
EL McClymont ◽  
AR Hoelzel ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Orcinus Orca ◽  
Marion Island ◽  
Killer Whales

scholarly journals Population growth is limited by nutritional impacts on pregnancy success in endangered Southern Resident killer whales (Orcinus orca)

PLoS ONE ◽  
2017 ◽  
Vol 12 (6) ◽  
pp. e0179824 ◽  
Author(s):  
Samuel K. Wasser ◽  
Jessica I. Lundin ◽  
Katherine Ayres ◽  
Elizabeth Seely ◽  
Deborah Giles ◽  
...  
Keyword(s):  
Population Growth ◽  
Orcinus Orca ◽  
Killer Whales

Killer whales (Orcinus orca) at Marion Island, Southern Ocean

2001 ◽  
Vol 36 (2) ◽  
pp. 163-175 ◽  
Author(s):  
M. Keith ◽  
M.N. Bester ◽  
P.A. Bartlett ◽  
D. Baker
Keyword(s):  
Southern Ocean ◽  
Orcinus Orca ◽  
Marion Island ◽  
Killer Whales

The seasonal occurrence and behaviour of Killer whales Orcinus orca, at Marion Island

2009 ◽  
Vol 184 (4) ◽  
pp. 449-464 ◽  
Author(s):  
P. R. Condy ◽  
R. J. Van Aarde ◽  
M. N. Bester
Keyword(s):  
Orcinus Orca ◽  
Seasonal Occurrence ◽  
Marion Island ◽  
Killer Whales

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
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