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Maneuverability by the sea lion Zalophus californianus: turning performance of an unstable body design.

Frank E Fish1, Jenifer Hurley, Daniel P Costa

  • 1Department of Biology, West Chester University, West Chester, PA 19383, USA. ffish@wcupa.edu

The Journal of Experimental Biology
|January 9, 2003
PubMed
Summary

Sea lions (Zalophus californianus) exhibit exceptional maneuverability for hunting elusive prey. Their unique morphology allows for rapid, tight turns, outperforming cetaceans at higher speeds.

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Area of Science:

  • Marine Biology
  • Biomechanics
  • Animal Locomotion

Background:

  • Maneuverability is crucial for marine predators, especially those hunting agile prey.
  • Fast-swimming marine mammals rely on rapid turns for successful predation.

Purpose of the Study:

  • To analyze the turning performance and kinematics of California sea lions (Zalophus californianus).
  • To compare the turning capabilities of Zalophus californianus with other marine mammals.

Main Methods:

  • Overhead video recordings of two Zalophus californianus performing unpowered turns.
  • Analysis of body flexion and flipper use as control surfaces during turns.
  • Measurement of turning radius, turn rate, and centripetal acceleration.

Main Results:

  • Zalophus californianus utilizes body flexion and flipper control surfaces with a 90-degree bank angle for turning.
  • Turning radius depends on body mass and swimming velocity, with relative minimum radii of 9-17% of body length.
  • At higher speeds, Zalophus californianus achieved smaller turning radii than cetaceans, with turn rates up to 690 degrees/s and accelerations up to 5.1 g.

Conclusions:

  • Zalophus californianus possesses a morphology that enhances instability, leading to superior turning performance.
  • This enhanced maneuverability is vital for sea lions to effectively hunt elusive prey in complex marine environments.