Application of a three-dimensional hyperbolic location system to the false killer whale (Pseudorca crassidens) depredation issue

2007 ◽  
Vol 7 (4) ◽  
pp. 312
Author(s):  
Craig McPherson ◽  
Phil Turner ◽  
Geoff McPherson ◽  
Owen P. Kenny
Keyword(s):  
Killer Whale ◽  
Three Dimensional ◽  
Location System ◽  
False Killer Whale ◽  
Pseudorca Crassidens

Skull morphological variation in a British stranded population of false killer whale (Pseudorca crassidens): a three-dimensional geometric morphometric approach

2022 ◽  
pp. 119-132
Author(s):  
Deborah Vicari ◽  
Richard C. Sabin ◽  
Richard P. Brown ◽  
Olivier Lambert ◽  
Giovanni Bianucci ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Variation ◽  
Killer Whale ◽  
Three Dimensional ◽  
Anatomical Landmarks ◽  
Geometric Morphometric ◽  
False Killer Whale ◽  
Sexual Shape Dimorphism ◽  
Males And Females ◽  
Pseudorca Crassidens

The false killer whale (Pseudorca crassidens (Owen, 1846)) is a globally distributed delphinid that shows geographical differentiation in its skull morphology. We explored cranial morphological variation in a sample of 85 skulls belonging to a mixed sex population stranded in the Moray Firth, Scotland, in 1927. A three-dimensional digitizer (Microscribe 2GX) was used to record 37 anatomical landmarks on the cranium and 25 on the mandible to investigate size and shape variation and to explore sexual dimorphism using geometric morphometric. Males showed greater overall skull size than females, whereas no sexual dimorphism could be identified in cranial and mandibular shape. Allometric skull changes occurred in parallel for both males and females, supporting the lack of sexual shape dimorphism for this particular sample. Also, fluctuating asymmetry did not differ between crania of males and females. This study confirms the absence of sexual shape dimorphism and the presence of a sexual size dimorphism in this false killer whale population.

scholarly journals A Case of Chronic Purulent Pneumonia in False Killer Whale (Pseudorca crassidens)

2005 ◽  
Vol 10 (2) ◽  
pp. 117-122 ◽  
Author(s):  
Fumio TERASAWA ◽  
Kimimasa TAKAHASHI ◽  
Isao OHSHITA ◽  
Masakazu KITAMURA
Keyword(s):  
Killer Whale ◽  
False Killer Whale ◽  
Pseudorca Crassidens

scholarly journals Active echolocation beam focusing in the false killer whale, Pseudorca crassidens

2012 ◽  
Vol 215 (8) ◽  
pp. 1306-1312 ◽  
Author(s):  
L. N. Kloepper ◽  
P. E. Nachtigall ◽  
M. J. Donahue ◽  
M. Breese
Keyword(s):  
Killer Whale ◽  
Beam Focusing ◽  
False Killer Whale ◽  
Pseudorca Crassidens

scholarly journals Evolutionary characterization of a highly repetitive sequence identified from the false killer whale (Pseudorca crassidens)

2009 ◽  
Vol 84 (2) ◽  
pp. 185-189
Author(s):  
Dae-Won Kim ◽  
Aram Kang ◽  
Sang-Haeng Choi ◽  
Zang Geun Kim ◽  
Woo-Jin Kim ◽  
...  
Keyword(s):  
Repetitive Sequence ◽  
Killer Whale ◽  
False Killer Whale ◽  
Pseudorca Crassidens

scholarly journals Using line acceleration to measure false killer whale (Pseudorca crassidens) click and whistle source levels during pelagic longline depredation

2016 ◽  
Vol 140 (5) ◽  
pp. 3941-3951 ◽  
Author(s):  
Aaron Thode ◽  
Lauren Wild ◽  
Janice Straley ◽  
Dustin Barnes ◽  
Ali Bayless ◽  
...  
Keyword(s):  
Killer Whale ◽  
False Killer Whale ◽  
Pseudorca Crassidens ◽  
Pelagic Longline

scholarly journals Finding of a skull of Pseudorca crassidens in Caleta de Los Loros, Rio Negro Province, Argentina

2015 ◽  
Vol 10 (1) ◽  
pp. 65-67 ◽  
Author(s):  
Raimundo Lucas Bustos ◽  
Maria Fernanda Negri ◽  
Gustavo Adolfo Daneri ◽  
Esperanza Amalia Varela ◽  
Marcos Luna
Keyword(s):  
Intertidal Zone ◽  
New Record ◽  
Present Note ◽  
Killer Whale ◽  
Low Frequency ◽  
South American ◽  
Sea Lions ◽  
Rio Negro ◽  
False Killer Whale ◽  
Pseudorca Crassidens

The false killer whale, Pseudorca crassidens, exhibits one of the widest and most continuous distributions among cetaceans. However, basic information about its biology is poorly known due to the low frequency of sightings and its offshore habits. Moreover, most of the knowledge on this species has been obtained from stranded animals. On 3 March 2012, in the proximity of a colony of South American sea lions (Otaria flavescens) located at Caleta de los Loros, Río Negro Province, Argentina (40o59’S, 64o14’W), a cetacean skull was found in the intertidal zone. The specimen was later identified as P. crassidens. The present note reports a new record of false killer whale in the continental shelf waters of Argentina and provides new data on the distribution and skull morphometrics of the species.

scholarly journals The abundance of false killer whale, Pseudorca crassidens (Artiodactyla: Delphinidae) in coastal waters of Golfo Dulce and Osa Peninsula, Costa Rica

2020 ◽  
Vol 68 (2) ◽  
Author(s):  
Erika Sánchez Robledo ◽  
Lenin Enrique Oviedo Correa ◽  
David Herra-Miranda ◽  
Juan Diego Pacheco-Polanco ◽  
Sierra Goodman ◽  
...  
Keyword(s):  
Costa Rica ◽  
Population Size ◽  
Killer Whale ◽  
Small Population ◽  
Killer Whales ◽  
Apparent Survival ◽  
Osa Peninsula ◽  
Small Population Size ◽  
False Killer Whale ◽  
Pseudorca Crassidens

Introduction: False killer whale (Pseudorca crassidens) is a tropical and subtropical social species that live in groups with individuals of mixed ages and sex classes. False killer whales have been documented since the late 1990s in Southwestern Costa Rica. Objective: To estimate the abundance of false killer whales in Osa Peninsula waters. Methods: Cetacean surveys off the Osa Peninsula Waters (OPW), Costa Rica, yielded opportunistic encounters with false killer whales in Drake Bay and Caño Island (2001-2015) and observations during formal surveys in Golfo Dulce (2005-2015). Photo-identification data was analyzed using capture-mark-recapture models in the study area, through an open population (POPAN) framework, considering the effect of time on the parameters apparent survival and capture probability, producing an abundance estimate for a superpopulation in the entire study area. Results: False killer whale abundance in OPW is characterized by a small population size of no more than 100 individuals, complemented by a very low probability of encounter and a contrasting high apparent survival. Conclusions: This population estimate should be taken as conservative, however, the small population size of less than 100 individuals should be considered vulnerable, in contrast to the increasing anthropogenic impacts in the coastal seascape. We argue the potential occurrence of population units along the coastal seascape of the Pacific littoral and oceanic island-associated units at Isla del Coco.

Echolocation beam shape and focusing in the false killer whale (Pseudorca crassidens)

2012 ◽  
Vol 131 (4) ◽  
pp. 3424-3424
Author(s):  
Laura Kloepper ◽  
Paul Nachtigall ◽  
Marlee Breese
Keyword(s):  
Killer Whale ◽  
Beam Shape ◽  
False Killer Whale ◽  
Pseudorca Crassidens
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