Echolocation clicks of two free-ranging, oceanic delphinids with different food preferences: false killer whales Pseudorca crassidens and Risso's dolphins Grampus griseus

2004 ◽  
Vol 207 (11) ◽  
pp. 1811-1823 ◽  
Author(s):  
P. T. Madsen
Keyword(s):  
Food Preferences ◽  
Killer Whales ◽  
Grampus Griseus ◽  
Pseudorca Crassidens ◽  
Free Ranging

scholarly journals Gastrointestinal parasites and prey items from a mass stranding of false killer whales, Pseudorca crassidens, in Rio Grande do Sul, Southern Brazil

2001 ◽  
Vol 61 (1) ◽  
pp. 55-61 ◽  
Author(s):  
A. L. V. ANDRADE ◽  
M. C. PINEDO ◽  
A. S. BARRETO
Keyword(s):  
Rio Grande ◽  
Gastrointestinal Parasites ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Ommastrephes Bartramii ◽  
Killer Whales ◽  
Food Items ◽  
Pseudorca Crassidens ◽  
Mass Stranding ◽  
Prey Items

The gastrointestinal tract of 14 false killer whales, 6 males and 8 females, stranded in June 1995 in southern Brazil, with total standard lengths from 338 to 507 cm, were analysed for endoparasites and food items. A pregnant female had a male foetus of 77.5 cm. Parasites were found in all 14 false killer whales. The nematode Anisakis simplex (Rudolphi, 1809) was found in the stomach of 57% of the animals and the acanthocephalan Bolbosoma capitatum (Linstow, 1889) Porta, 1908 was present in the intestine of all specimens and showed densities up to 600 m-1. An unidentified cestode (Tethrabothridae) was found also in the intestines of 14% of the individuals. The high infections of B. capitatum and A. simplex were not directly related with the cause of death. In the stomachs of four females, beaks of at least eight specimens of the oceanic and epipelagic species Ommastrephes bartramii (Lesueur, 1821) were found, with mantle lengths ranging from 189.8 to 360.9 mm. The distribution of O. bartramii in the coast of Rio Grande do Sul is consistent with false killer whales feeding in continental shelf waters.

LASER-METRICS OF FREE-RANGING KILLER WHALES

2006 ◽  
Vol 22 (3) ◽  
pp. 735-743 ◽  
Author(s):  
J. W. Durban ◽  
K. M. Parsons
Keyword(s):  
Killer Whales ◽  
Free Ranging

Usage of monophonic and biphonic calls by free-ranging resident killer whales (Orcinus orca) in Kamchatka, Russian Far East

2009 ◽  
Vol 12 (1) ◽  
pp. 37-44 ◽  
Author(s):  
O. A. Filatova ◽  
I. D. Fedutin ◽  
M. M. Nagaylik ◽  
A. M. Burdin ◽  
E. Hoyt
Keyword(s):  
Russian Far East ◽  
Far East ◽  
Orcinus Orca ◽  
Killer Whales ◽  
Free Ranging

High levels of persistent organic pollutants measured in blubber of island-associated false killer whales (Pseudorca crassidens) around the main Hawaiian Islands

2009 ◽  
Vol 58 (12) ◽  
pp. 1932-1937 ◽  
Author(s):  
Gina M. Ylitalo ◽  
Robin W. Baird ◽  
Gladys K. Yanagida ◽  
Daniel L. Webster ◽  
Susan J. Chivers ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Hawaiian Islands ◽  
Killer Whales ◽  
Pseudorca Crassidens

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.

The underwater whistle repertoire of wild false killer whales (Pseudorca crassidens)

2001 ◽  
Vol 109 (5) ◽  
pp. 2390-2390 ◽  
Author(s):  
A. E. Nester ◽  
J. A. Thomas ◽  
A. Acevedo‐Guiterrez
Keyword(s):  
Killer Whales ◽  
Pseudorca Crassidens

scholarly journals New sightings of false killer whales Pseudorca crassidens (Owen, 1846) in Chile

2003 ◽  
Vol 38 (2) ◽  
Author(s):  
Marcelo A Flores M ◽  
Rodrigo Moraga ◽  
María José Pérez ◽  
Erika Hanshing ◽  
Carlos Olavarría
Keyword(s):  
Killer Whales ◽  
Pseudorca Crassidens
Sign in / Sign up

Export Citation Format

Share Document