Robin W. Baird

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Using suction-cup attached time^depth recorder/VHF radio tags, we have obtained the ¢rst diving data on northern bottlenose whales (Hyperoodon ampullatus), the ¢rst such data on any species within the family Ziphiidae. Two deployments in 1997 on northern bottlenose whales in a submarine canyon o¡ Nova Scotia demonstrated their exceptional diving ability,(More)
A low level of genetic variation in mammalian populations where the census population size is relatively large has been attributed to various factors, such as a naturally small effective population size, historical bottlenecks and social behaviour. The killer whale (Orcinus orca) is an abundant, highly social species with reduced genetic variation. We find(More)
Beaked whales (family Ziphiidae) are thought to be among the longest and deepest diving mammals, and some species appear to be prone to mass-strand in response to high-intensity sonar. We studied diving behaviour of Cuvier’s (Ziphius cavirostris G. Cuvier, 1823) and Blainville’s (Mesoplodon densirostris (Blainville, 1817)) beaked whales in Hawaiian waters(More)
Despite their world-wide distribution throughout the tropics and subtropics, false killer whales (Pseudorca crassidens) are one of the lesser-known large odontocetes. Genetic evidence indicates a demographically isolated population around the main Hawaiian Islands. We examine site fidelity, movements and association patterns in this population using data(More)
False killer whales (Pseudorca crassidens (Owen, 1846)) are incidentally taken in the North Pacific pelagic long-line fishery, but little is known about their population structure to assess the impact of these takes. Using mitochondrial DNA (mtDNA) control region sequence data, we quantified genetic variation for the species and tested for genetic(More)
Although the Ziphiidae are the second-most speciose family of cetaceans, information on beaked whale species and populations has been limited by the difficulties in finding and approaching free-ranging individuals. Site fidelity, patterns of association, and movements of two species, Cuvier’s (Ziphius cavirostris) and Blainville’s (Mesoplodon densirostris)(More)
We investigate diel variation in beaked whale diving behavior using data from timedepth recorders deployed on six Blainville’s (Mesoplodon densirostris) beaked whales (126 hours day; 129 hours night) and two Cuvier’s (Ziphius cavirostris) beaked whales (19 hours day; 15 hours night). Deep foraging dives (>800 m) occurred at similar rates during the day and(More)
Most analyses of the relationship between group size and food intake of social carnivores have shown a discrepancy between the group size that maximizes energy intake and that which is most frequently observed. Around southern Vancouver Island, British Columbia, killer whales of the so-called transient form forage in small groups, and appear to prey(More)
Two distinct forms of killer whale (Orcinus orca) occur off the coast of British Columbia, Alaska and Washington State. These have different diets, and may be reproductively isolated. Because the primary food of transient whales (pinnipeds) is a potential competitor for the primary food of resident whales (salmon), or for the smaller fishes on which salmon(More)
Recent evidence indicates that there is a small, demographically isolated, island-associated population of false killer whales (Pseudorca crassidens) around the main Hawaiian Islands. Although it is known that false killer whales in Hawai‘i are sometimes killed or seriously injured in the Hawai‘i-based longline fishery, it is not known whether such(More)