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Lift-based paddling in diving grebe.

L C Johansson1, U M Lindhe Norberg

  • 1Department of Zoology, Göteborg University, Box 463, SE-405 30 Göteborg, Sweden. christoffer.johansson@zool.gu.se

The Journal of Experimental Biology
|April 24, 2001
PubMed
Summary
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Great crested grebes use a unique lift-based swimming technique, unlike other water birds. This propels them faster and more efficiently using their specialized feet as hydrofoils.

Area of Science:

  • * Biomechanics
  • * Hydrodynamics
  • * Animal locomotion

Background:

  • * The locomotion of diving birds is crucial for foraging and predator evasion.
  • * Previous assumptions suggested drag-based propulsion in grebes, similar to anseriforms.

Purpose of the Study:

  • * To investigate the three-dimensional kinematics of great crested grebe (Podiceps cristatus) underwater propulsion.
  • * To determine the hydrodynamic mechanism employed by grebes during swimming.

Main Methods:

  • * Digital analysis of sequential video images from dorsal and lateral views.
  • * Determination of the three-dimensional kinematics of the grebe's foot movement during acceleration.

Main Results:

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  • * Grebe feet move in an arc nearly normal to the direction of motion, differing from anseriforms.
  • * The grebe's foot stroke is primarily lift-based, not drag-based.
  • * Toes function as self-stabilizing, multi-slotted hydrofoils during the power phase.

    • Conclusions:

    • * Grebes utilize a lift-based propulsion system, enhancing swimming speed and energetic efficiency.
    • * This finding challenges previous understandings of grebe locomotion and functional morphology.