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The hydrodynamics of dolphin drafting.

Daniel Weihs1

  • 1Faculty of Aerospace Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel. dweihs@tx.technion.ac.il

Journal of Biology
|May 11, 2004
PubMed
Summary

Dolphin calves use drafting, a hydrodynamic interaction, to gain up to 90% of the thrust needed to keep up with their mothers. This mechanism helps calves conserve energy and avoid separation during rapid movements.

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Area of Science:

  • Marine Biology
  • Hydrodynamics
  • Animal Locomotion

Background:

  • Drafting in cetaceans involves force transfer without physical contact, hypothesized to aid calf-mother coordination.
  • Calf separation from mothers during tuna vessel chases is a significant concern.
  • This study investigates drafting hydrodynamics to understand calf separation mechanisms.

Purpose of the Study:

  • To analyze the hydrodynamic forces and moments involved in drafting between mother and calf dolphins.
  • To quantify the energetic benefits of drafting for young calves.
  • To investigate the role of drafting in preventing calf separation.

Main Methods:

  • Quantitative analysis of forces and moments on unequally sized, dolphin-like slender bodies.
  • Theoretical modeling of hydrodynamic interactions.
  • Comparison with observational data of eastern spinner dolphins (Stenella longirostris).

Main Results:

  • Bernoulli suction creates an attractive force between mother and calf.
  • The displacement effect allows calves to utilize forward-moving water for propulsion.
  • Calves can gain up to 90% of required thrust at speeds up to 2.4 m/sec.
  • Observed thrust savings in eastern spinner dolphins reach up to 60%.

Conclusions:

  • Hydrodynamic interactions, specifically drafting, are crucial for dolphin calves to maintain pace with mothers.
  • Drafting significantly reduces the energetic cost for calves.
  • Understanding drafting is key to addressing calf separation issues.

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