Maintaining Contact
Author | : Patrick J. O. Miller |
Publisher | : |
Total Pages | : 614 |
Release | : 2000 |
Genre | : Animal communication |
ISBN | : |
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Author | : Patrick J. O. Miller |
Publisher | : |
Total Pages | : 614 |
Release | : 2000 |
Genre | : Animal communication |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2000 |
Genre | : |
ISBN | : |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2000.
Author | : |
Publisher | : |
Total Pages | : 154 |
Release | : 2000 |
Genre | : |
ISBN | : |
This thesis describes the structure and use of acoustic signals produced by resident killer whales off Vancouver Island. Calling of isolated subpods differed similarly but more subtly than across pods, suggesting that pod-specific calling arises as a consequence of drift between subgroups as they gradually separate into different pods. A towed array beamforming system was developed to identify vocalizing killer whales concurrent with focal behavioral observations. A sample of 140 calls was recorded from three members of one matrilineal subgroup showing they shared at least four call types, suggesting matrilineal group members use calls in a similar fashion. Source levels measured using two beamforming arrays towed in series were combined with a model of sound propagation and perception to estimate the maximum range of detectability of each sound in quiet conditions. The estimated range of 4.5 to 26.2 km suggests killer whales can maintain acoustic contact over long distances. The frequency structure of 263 calls recorded directly in front and behind animals depended on signaler orientation, with high-frequencies attenuated when the signaler was oriented away. This directionality pattern appears to provide a simple and reliable cue of signaler direction-of-movement, helping killer whales regulate their spacing relative to each other.
Author | : Filipa Isabel Pereira Samarra |
Publisher | : |
Total Pages | : 0 |
Release | : 2011 |
Genre | : Killer whale |
ISBN | : |
Author | : James Higham |
Publisher | : Cambridge University Press |
Total Pages | : 425 |
Release | : 2014-03-27 |
Genre | : Business & Economics |
ISBN | : 0521195977 |
A critical insight into the diverse socio-cultural, political, economic and ecological contexts of the global whale-watching industry.
Author | : |
Publisher | : |
Total Pages | : 400 |
Release | : 2006 |
Genre | : Animal sounds |
ISBN | : |
Author | : Dawn M. Grebner |
Publisher | : |
Total Pages | : 252 |
Release | : 2002 |
Genre | : Killer whale |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 340 |
Release | : 1998 |
Genre | : Animal sounds |
ISBN | : |
Author | : William A. Watkins |
Publisher | : |
Total Pages | : 41 |
Release | : 1998 |
Genre | : |
ISBN | : |
Calls of killer whales, Orcinus Orca, were analyzed using computed sound features to classify sound patterns and identify call similarities. Calls were classified and separated according to the pod/family group within clans identified previously by John Ford (U. BC) in the Vancouver whale populations. Acoustic characteristics of the same call type from different individuals were extremely similar, so that discriminating these different sounds was the goal. The WHOl AcouStat program and associated database systems were used to define numerical statistics for each call, and then, these were compared to sort and classify the sounds.
Author | : William A. Watkins |
Publisher | : |
Total Pages | : 0 |
Release | : 1998 |
Genre | : Bioacoustics |
ISBN | : |
Calls of killer whales, Orcinus Orca, were analyzed using computed sound features to classify sound patterns and identify call similarities. Calls were classified and separated according to the pod/family group within clans identified previously by John Ford (U. BC) in the Vancouver whale populations. Acoustic characteristics of the same call type from different individuals were extremely similar, so that discriminating these different sounds was the goal. The WHOl AcouStat program and associated database systems were used to define numerical statistics for each call, and then, these were compared to sort and classify the sounds.