[MARMAM] new publication on humpback whale feeding
awerth at hsc.edu
Wed May 15 10:55:09 PDT 2019
On behalf of my coauthors (Madison Kosma, Ellen Chenoweth, and Jan Straley) I am pleased to announce the online, early view publication of our article in Marine Mammal Science on the use of drone and GoPro cameras to investigate the morphology and kinematics of prey engulfment in humpback whales: Werth, A.J., M.M. Kosma, E.M. Chenoweth, J.M. Straley. New views of humpback whale flow dynamics and oral morphology during prey engulfment. Marine Mammal Science. DOI: 10.1111/mms.12614
Abstract: The rise of inexpensive, user-friendly cameras and editing software promises to revolutionize data collection with minimal disturbance to marine mammals. Video sequences recorded by aerial drones and GoPro cameras provided close-up views and unique perspectives of humpback whales engulfing juvenile salmon at or just below the water surface in Southeast Alaska and Prince William Sound. Although humpback feeding is famous for its flexibility, several stereotyped events were noted in the 47 lunges we analyzed. Engulfment was rapid (mean 2.07 s), and the entrance through which the tongue inverts into the ventral pouch was seen as water rushes in. Cranial elevation was a major contributor to gape, and pouch contraction sometimes began before full gape closure, with reverberating waves indicating rebounding flow of water within the expanded pouch. Expulsion of filtered water began with a small splash at the anterior of the mouth, followed by sustained excurrent flow in the mouth's central or posterior regions. Apart from a splash of rebounding water, water within the mouth was surprisingly turbulence-free during engulfment, but submersion of the whale's head created visible surface whirlpools and vortices which may aggregate prey for subsequent engulfment.
The article can be accessed via the Wiley Online Library and journal website; contact me if interested.
Alexander J. Werth, Ph.D.
Trinkle Professor of Biology
Box 162, Hampden-Sydney, VA 23943 USA
434-223-6326, fax 434-223-6374
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