[MARMAM] New paper on feeding signatures in seals

Kristina Ydesen kristinaydesen at gmail.com
Tue Jul 22 23:28:05 PDT 2014


Dear All,



We have recently published a new method to detect feeding events in
pinnipeds using head-mounted accelerometers. For those of you interested,
the title and abstract can be found below.



J.Exp. Biol.
http://jeb.biologists.org/content/early/2014/04/01/jeb.100016.abstract
What a jerk: prey engulfment revealed by high-rate, super-cranial
accelerometry on a harbour seal (*Phoca vitulina*)

K. Ydesen, D. Wisniewska, J. Hansen, K. Beedholm, M. Johnson and P.T. Madsen
Abstract

A key component in understanding the ecological role of marine mammal
predators is to identify how, where and how much prey they capture in time
and space. Satellite and archival tags on pinnipeds generally only provide
diving and positioning information, and foraging is often inferred to take
place in particular shaped dives or when the animal remains in an area for
an extended interval. However, fast movements of the head and jaws may
provide reliable feeding cues that can be detected by small low-power
accelerometers mounted on the head. To test this notion, a harbour seal (*Phoca
vitulina*) was trained to wear an OpenTag (sampling at 200 or 333 Hz with
±2 or ±16 g clipping) on its head while catching fish prey in front of four
underwater digital high-speed video cameras. We show that both raptorial
and suction feeding generate jerk (i.e., differential of acceleration)
signatures with maximum peak values exceeding 1000 m/s3. We conclude that
reliable prey capture cues can be derived from fast-sampling, head mounted
accelerometer tags thus holding a promising potential for long-term studies
of foraging ecology and field energetics of aquatic predators in their
natural environments.





Requests for pdfs can be made to



kristinaydesen at gmail.com





On behalf of the authors

Kristina
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