Swimming by sea otters: adaptations for low energetic cost locomotion

SummaryThe energetics and hydrodynamics of surface and submerged swimming were compared in the sea otter (Enhydra lutris).1.Sea otters used two distinct speed ranges that varied with swimming mode. Sustained surface swimming was limited to speeds less than 0.80 m/s, while sustained submerged swimming occurred over the range of 0.60 to 1.39 m/s.2.Rates of oxygen consumption (VO2) at the transition speed (0.80 m/s) were 41% lower for submerged swimming by sea otters in comparison to surface swimming.3.Total cost of transport for surface swimming sea otters, 12.56 joules/kg·sm, was more than 12 times the predicted value for a similarly-sized salmonid fish. Transport costs for submerged swimming at the same speed was only 7.33 times the predicted value.4.The allometric relationship for minimum cost of transport in surface swimming birds and mammals wasy=23.87x−0.15 wherey=cost of transport in joules/kg·m andx=body mass in kg. This regression loosely parallels the relationship for salmonid fish.5.Correlations between aquatic behavior, morphological specialization, and swimming energetics indicate that the development of swimming in mustelids involved transitions from fore-paw to hindpaw propulsion, and from surface to submerged swimming.

[1]  J. Estes.  Enhydra lutris. American Society of Mammalogists , 1980 .

[2]  J. R. Brett.  The Respiratory Metabolism and Swimming Performance of Young Sockeye Salmon , 1964 .

[3]  F. Fish.  Aerobic Energetics of Surface Swimming in the Muskrat Ondatra zibethicus , 1982, Physiological Zoology.

[4]  P. Withers,et al.  Measurement of VO2, VCO2, and evaporative water loss with a flow-through mask. , 1977, Journal of applied physiology: respiratory, environmental and exercise physiology.

[5]  D. I. Miller,et al.  Biomechanics of Swimming , 1975, Exercise and sport sciences reviews.

[6]  R. Full,et al.  Biology of the Land Crabs: ENERGETICS AND LOCOMOTION , 1988 .

[7]  P. W. Hochachka.  Balancing conflicting metabolic demands of exercise and diving. , 1986, Federation proceedings.

[8]  K. Kenyon.  The sea otter in the eastern Pacific Ocean , 1975 .

[9]  F. J. Tarasoff,et al.  Locomotory patterns and external morphology of the river otter, sea otter, and harp seal (Mammalia). , 1972, Canadian journal of zoology.

[10]  S. D. Feldkamp,et al.  Swimming in the California sea lion: morphometrics, drag and energetics. , 1987, The Journal of experimental biology.

[11]  P E Di Prampero,et al.  Energetics of swimming in man. , 1974, Journal of applied physiology.

[12]  D. Benos,et al.  The amiloride-sensitive sodium channel. , 1986, The American journal of physiology.

[13]  J. Estes,et al.  Metabolism and Thermoregulation in the Sea Otter , 1974, Physiological Zoology.

[14]  K. Schmidt-Nielsen,et al.  The metabolic cost of swimming in ducks. , 1970, The Journal of experimental biology.

[15]  E. Byf.  MECHANICS, POWER OUTPUT AND EFFICIENCY OF THE SWIMMING MUSKRAT (ONDATRA ZIBETHICUS) , 1984 .

[16]  E. Nadel,et al.  Energy exchanges of swimming man. , 1974, Journal of applied physiology.

[17]  G. Kooyman.  Respiratory Adaptations in Marine Mammals , 1973 .

[18]  T. G. Lang,et al.  Speed, Power, And Drag Measurements of Dolphins and Porpoises , 1975 .

[19]  Gambaryan.  How Mammals Run , 1974 .

[20]  P W Hochachka,et al.  Microcomputer-assisted metabolic studies of voluntary diving of Weddell seals. , 1986, The American journal of physiology.

[21]  C. R. Taylor,et al.  Running on Two or on Four Legs: Which Consumes More Energy? , 1973, Science.

[22]  K Schmidt-Nielsen,et al.  Locomotion: energy cost of swimming, flying, and running. , 1972, Science.

[23]  D. Costa,et al.  Contribution of Specific Dynamic Action to Heat Balance and Thermoregulation in the Sea Otter Enhydra lutris , 1984, Physiological Zoology.

[24]  D. Costa,et al.  Oxygen consumption, thermoregulation, and the effect of fur oiling and washing on the sea otter, Enhydra lutris , 1982 .

[25]  J. Hart,et al.  Use of the Pauling oxygen analyzer for measurement of oxygen consumption of animals in open-circuit systems and in a short-lag, closed-circuit apparatus. , 1957, Journal of applied physiology.

[26]  H. Hertel,et al.  Structure-form-movement , 1966 .

[27]  N. Heglund,et al.  Energetics and mechanics of terrestrial locomotion. , 1982, Annual review of physiology.

[28]  I Holmér,et al.  Oxygen uptake during swimming in man. , 1972, Journal of applied physiology.

[29]  H. Pw.  Balancing conflicting metabolic demands of exercise and diving. , 1986 .

[30]  R. Baudinette,et al.  The energetics of ‘flying’ and ‘paddling’ in water: locomotion in penguins and ducks , 1985, Journal of Comparative Physiology B.

[31]  C Lenfant,et al.  Gas transport and oxygen storage capacity in some pinnipeds and the sea otter. , 1970, Respiration physiology.

[32]  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 .

[33]  P. Webb.  Hydrodynamics and Energetics of Fish Propulsion , 1975 .

[34]  M. Fedak,et al.  One-step N2-dilution technique for calibrating open-circuit VO2 measuring systems. , 1981, Journal of applied physiology: respiratory, environmental and exercise physiology.

[35]  Paul W. Webb,et al.  Simple Physical Principles and Vertebrate Aquatic Locomotion , 1988 .

[36]  T. Williams.  Locomotion in the North American mink, a semi-aquatic mammal. I. Swimming energetics and body drag. , 1983, The Journal of experimental biology.

[37]  R. W. Blake,et al.  Influence of pectoral fin shape on thrust and drag in labriform locomotion , 1981 .

[38]  Terrie M. Williams,et al.  SWIMMING METABOLISM OF YEARLING AND ADULT HARBOR SEALS PHOCA VITULINA ' , 2016 .

[39]  N. Heglund,et al.  Energetics and mechanics of terrestrial locomotion. I. Metabolic energy consumption as a function of speed and body size in birds and mammals. , 1982, The Journal of experimental biology.