[MARMAM] New paper on odontocetes sound evolution

Tadamichi Morisaka chakasha at mail.interq.or.jp
Sat May 5 20:25:29 PDT 2007

Dear All,

We are pleased to announce the publication of a new paper, "Predation by
killer whales (Orcinus orca) and the evolution of whistle loss and
narrow-band high frequency clicks in odontocetes''. Please email me
(Tadamichi Morasaka) for reprints (morisaka at ethol.zool.kyoto-u.ac.jp).
OR please download the following site:
(NOTE:The pdf file has about 2MB!!)

Predation by killer whales (Orcinus orca) and the evolution of whistle loss
and narrow-band high frequency clicks in odontocetes 
Journal of Evolutionary Biology (OnlineEarly Articles). 

A disparate selection of toothed whales (Odontoceti) share striking features
of their acoustic repertoires including the absence of whistles and high
frequency but weak (low peak-to-peak source level) clicks that have a
relatively long duration and a narrow bandwidth. The non-whistling, high
frequency click species include members of the family Phocoenidae, members
of one genus of delphinids, Cephalorhynchus, the pygmy sperm whale, Kogia
breviceps, and apparently the sole member of the family Pontoporiidae. Our
review supports the 'acoustic crypsis' hypothesis that killer whale
predation risk was the primary selective factor favouring an echolocation
and communication system in cephalorhynchids, phocoenids and possibly
Pontoporiidae and Kogiidae restricted to sounds that killer whales hear
poorly or not at all (< 2 and > 100 kHz).


Tadamichi MORISAKA, Ph.D.

Postdoctral researcher of JSPS

Kohshima Laboratory, Department of Biological Sciences,
Graduate School of Bioscience and Biotechnology,
Tokyo Institute of Technology

W3-43, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8551,
+81-3-5734-3383 (tel); +81-3-5734-2946 (fax)

morisaka at ethol.zool.kyoto-u.ac.jp (-April)
chakasha at mail.interq.or.jp


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