Locomotor behavior across an environmental transition in the ropefish, Erpetoichthys calabaricus

Cinnamon M. Pace, Alice C Gibb

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Many amphibious organisms undergo repeated aquatic to terrestrial transitions during their lifetime; limbless, elongate organisms that make such transitions must rely on axial-based locomotion in both habitats. How is the same anatomical structure employed to produce an effective behavior across such disparate habitats? Here, we examine an elongate amphibious fish, the ropefish (Erpetoichthys calabaricus), and ask: (1) how do locomotor movements change during the transition between aquatic and terrestrial environments and (2) do distantly related amphibious fishes demonstrate similar modes of terrestrial locomotion? Ropefish were examined moving in four experimental treatments (in which the water level was to lowered mimic the transition between environments) that varied from fully aquatic to fully terrestrial. Kinematic parameters (lateral excursion, wavelength, amplitude and frequency) were calculated for points along the midline of the body and compared across treatments. Terrestrial locomotion in the ropefish is characterized by long, slow, large-amplitude undulations down the length of the body; in contrast, aquatic locomotion is characterized by short-wavelength, small-amplitude, high-frequency undulations that gradually increase in an anterior to posterior direction. Experimental treatments with intermediate water levels were more similar to aquatic locomotion in that they demonstrated an anterior to posterior pattern of increasing lateral excursion and wave amplitude, but were more similar to terrestrial locomotion with regard to wavelength, which did not change in an anterior to posterior direction. Finally, the ropefish and another elongate amphibious fish, the eel, consistently exhibit movements characterized by 'path following' when moving on land, which suggests that elongate fishes exhibit functional convergence during terrestrial locomotion.

Original languageEnglish (US)
Pages (from-to)530-537
Number of pages8
JournalJournal of Experimental Biology
Volume214
Issue number4
DOIs
StatePublished - Feb 2011

Fingerprint

locomotion
Locomotion
Fishes
wavelengths
fish
wavelength
Ecosystem
water level
Eels
Water
terrestrial environment
organisms
intermediate water
habitat
eel
Erpetoichthys calabaricus
habitats
kinematics
Biomechanical Phenomena
aquatic environment

Keywords

  • Amphibious fish
  • Kinematics
  • Swimming
  • Terrestrial undulation

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Physiology
  • Insect Science
  • Aquatic Science

Cite this

Locomotor behavior across an environmental transition in the ropefish, Erpetoichthys calabaricus. / Pace, Cinnamon M.; Gibb, Alice C.

In: Journal of Experimental Biology, Vol. 214, No. 4, 02.2011, p. 530-537.

Research output: Contribution to journalArticle

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