What a jerk: prey engulfment revealed by high-rate, super-cranial accelerometry on a harbour seal (Phoca vitulina). Ydesen, K. S., Wisniewska, D. M., Hansen, J. D., Beedholm, K., Johnson, M., & Madsen, P. T. The Journal of Experimental Biology, 2014.
Paper doi abstract bibtex 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.
@ARTICLE{Ydesen2014,
author = {Ydesen, Kristina S. and Wisniewska, Danuta M. and Hansen, Janni D.
and Beedholm, Kristian and Johnson, Mark and Madsen, Peter T.},
title = {What a jerk: prey engulfment revealed by high-rate, super-cranial
accelerometry on a harbour seal (Phoca vitulina)},
journal = {The Journal of Experimental Biology},
year = {2014},
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.},
doi = {10.1242/jeb.100016},
eprint = {http://jeb.biologists.org/content/early/2014/04/01/jeb.100016.full.pdf+html},
file = {:Ydesen et al 2014.pdf:PDF},
owner = {Tiago Marques},
timestamp = {2014.07.23},
url = {http://jeb.biologists.org/content/early/2014/04/01/jeb.100016.abstract}
}
Downloads: 0
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Satellite and archival tags on pinnipeds generally\r\n\tonly provide diving and positioning information, and foraging is\r\n\toften inferred to take place in particular shaped dives or when the\r\n\tanimal remains in an area for an extended interval. However, fast\r\n\tmovements of the head and jaws may provide reliable feeding cues\r\n\tthat can be detected by small low-power accelerometers mounted on\r\n\tthe head. To test this notion, a harbour seal (Phoca vitulina) was\r\n\ttrained to wear an OpenTag (sampling at 200 or 333 Hz with ±2 or\r\n\t±16 g clipping) on its head while catching fish prey in front of\r\n\tfour underwater digital high-speed video cameras. We show that both\r\n\traptorial and suction feeding generate jerk (i.e., differential of\r\n\tacceleration) signatures with maximum peak values exceeding 1000\r\n\tm/s3. 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