Tracking of biogenic hydrodynamic trails in harbour seals (Phoca vitulina)

SUMMARY For seals hunting in dark and murky waters one source of sensory information for locating prey consists of fish-generated water movements, which they can detect using their highly sensitive mystacial vibrissae. As water movements in the wake of fishes can persist for several minutes, hydrodynamic trails of considerable length are generated. It has been demonstrated that seals can use their vibrissae to detect and track hydrodynamic trails generated artificially by miniature submarines. In the present study, we trained a harbour seal to swim predefined courses, thus generating biogenic hydrodynamic trails. The structure of these trails was measured using Particle Image Velocimetry. A second seal was trained to search for and track the trail after the trail-generating seal had left the water. Our trail-following seal was able to detect and accurately track the hydrodynamic trail, showing search patterns either mostly congruent with the trail or crossing the trail repeatedly in an undulatory way. The undulatory trail-following search pattern might allow a seal to relocate a lost trail or successfully track a fleeing, zigzagging prey fish.

[1]  T. Bekkby,et al.  Diving behaviour of harbour seal Phoca vitulina pups from nursing to independent feeding , 2000 .

[2]  J. Webb,et al.  Mechanosensory Lateral Line , 2000 .

[3]  T. Aarup.  Transparency of the North Sea and Baltic Sea - a Secchi depth data mining study , 2002 .

[4]  W. Bowen,et al.  Diving behaviour of lactating harbour seals and their pups during maternal foraging trips , 1999 .

[5]  L. Fuiman,et al.  Hunting behavior of a marine mammal beneath the antarctic fast Ice , 1999, Science.

[6]  H. Bleckmann.  Reception of hydrodynamic stimuli in aquatic and semiaquatic animals , 1994 .

[7]  R. Blickhan,et al.  The time course and frequency content of hydrodynamic events caused by moving fish, frogs, and crustaceans , 1991, Journal of Comparative Physiology A.

[8]  G. Dehnhardt,et al.  Underwater auditory localization by a swimming harbor seal (Phoca vitulina). , 2006, The Journal of the Acoustical Society of America.

[9]  J. Hoef,et al.  DIFFERENTIAL MOVEMENTS BY HARBOR SEAL PUPS IN CONTRASTING ALASKA ENVIRONMENTS , 2005 .

[10]  D. Hart,et al.  PIV error correction , 2000 .

[11]  A Kaminski,et al.  Sensitivity of the mystacial vibrissae of harbour seals (Phoca vitulina) for size differences of actively touched objects. , 1995, The Journal of experimental biology.

[12]  Louis W. Gellermann.  Chance Orders of Alternating Stimuli in Visual Discrimination Experiments , 1933 .

[13]  K. Wiese,et al.  Sensitivity to Movement and Vibration of Water in the North Sea Shrimp Crangon Crangon L. , 1987 .

[14]  M. Wernet.  Digital Particle Image Velocimetry , 2003 .

[15]  Jelle Atema,et al.  The importance of the lateral line in nocturnal predation of piscivorous catfish , 2004, Journal of Experimental Biology.

[16]  J. Westerweel.  Fundamentals of digital particle image velocimetry , 1997 .

[17]  H. Bleckmann,et al.  Hydrodynamic Trail-Following in Harbor Seals (Phoca vitulina) , 2001, Science.

[18]  Guido Dehnhardt,et al.  Tactual discrimination of size and shape by a California sea lion (Zalophus californianus) , 1996 .

[19]  R. L. Eaton,et al.  Hunting Behavior of the Cheetah , 1970 .

[20]  G. Dehnhardt,et al.  Salinity discrimination in harbour seals: a sensory basis for spatial orientation in the marine environment? , 2000, Naturwissenschaften.

[21]  R. Adrian.  Particle-Imaging Techniques for Experimental Fluid Mechanics , 1991 .

[22]  R. Blickhan,et al.  Generation of a vortex chain in the wake of a Suhundulatory swimmer , 1992, Naturwissenschaften.

[23]  D. Renouf.  Preliminary measurements of the sensitivity of the vibrissae of Harbour seals (Phoca vitulina) to low frequency vibrations , 2009 .

[24]  Wolf Hanke,et al.  The hydrodynamic trails of Lepomis gibbosus (Centrarchidae), Colomesus psittacus (Tetraodontidae) and Thysochromis ansorgii (Cichlidae) investigated with scanning particle image velocimetry , 2004, Journal of Experimental Biology.

[25]  M. S. Laverack.  Responses of cuticular sense organs of the lobster, Homarus vulgaris (crustacea)—I. Hair-peg organs as water current receptors , 1962 .

[26]  G. Dehnhardt,et al.  Effect of water turbidity on the visual acuity of harbor seals (Phoca vitulina) , 2006, Vision Research.

[27]  Determination of the vibration sensitivity of harbour seal Phoca vitulina (L.) vibrissae , 1986 .

[28]  J. Tautz,et al.  The Detection of Waterborne Vibration by Sensory Hairs on the Chelae of the Crayfish , 1980 .

[29]  K. Wiese,et al.  Mechanoreceptors for near-field water displacements in crayfish. , 1976, Journal of neurophysiology.

[30]  T. Williams,et al.  Division of Comparative Physiology and Biochemistry , Society for Integrative and Comparative Biology Swimming Performance and Hydrodynamic Characteristics of Harbor Seals Phoca vitulina , 2016 .

[31]  M. S. Laverack.  RESPONSES OF CUTICULAR SENSE ORGANS OF THE LOBSTER, HOMARUS VULGARIS (CRUSTACEA). III. ACTIVITY INVOKED IN SENSE ORGANS OF THE CARAPACE. , 1963, Comparative Biochemistry and Physiology A.

[32]  Whitlow W. L. Au,et al.  The Sonar of Dolphins , 1993, Springer New York.

[33]  H. Bleckmann,et al.  The ageing of the low-frequency water disturbances caused by swimming goldfish and its possible relevance to prey detection. , 2000, The Journal of experimental biology.

[34]  Ronald J. Schusterman,et al.  DARK ADAPTATION AND VISUAL SENSITIVITY IN SHALLOW AND DEEP‐DIVING PINNIPEDS1 , 1999 .

[35]  F E Fish,et al.  Kinematics and estimated thrust production of swimming harp and ringed seals. , 1988, The Journal of experimental biology.

[36]  M. Lighthill.  Hydromechanics of Aquatic Animal Propulsion , 1969 .

[37]  J. Godin.  Behavioural ecology of teleost fishes , 1997 .

[38]  H. Bleckmann,et al.  Seal whiskers detect water movements , 1998, Nature.

[39]  R. Dykes.  Afferent fibers from mystacial vibrissae of cats and seals. , 1975, Journal of neurophysiology.

[40]  F. Grasso,et al.  Tracking wakes: The nocturnal predatory strategy of piscivorous catfish , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[41]  R. Small,et al.  DEVELOPMENT OF DIVING BY HARBOR SEAL PUPS IN TWO REGIONS OF ALASKA: USE OF THE WATER COLUMN , 2006 .