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Changes in locomotor activity parameters with variations in cycle time in larval lamprey
Malinda R Boyd1, Andrew D McClellan
1Division of Biological Sciences and Interdisciplinary Neuroscience Program, University of Missouri, Columbia, MO 65211-6190, USA.
The Journal of Experimental Biology
|November 1, 2002
Summary
Lamprey swimming speed is regulated by adjusting burst proportion (BP) and intersegmental phase lag (phi). BP increases with faster swimming, while phi remains constant to maintain efficient locomotion.
Area of Science:
- Neuroscience
- Comparative Physiology
- Developmental Biology
Background:
- Lamprey larvae exhibit complex locomotor behaviors crucial for survival.
- Understanding the neural control of locomotion in developing vertebrates provides insights into fundamental biological principles.
Purpose of the Study:
- To investigate how burst proportion (BP) and intersegmental phase lag (phi) of locomotor activity change with cycle time (T) in larval lamprey.
- To determine the relationship between these parameters and swimming speed in both whole animals and in vitro preparations.
Main Methods:
- Locomotor activity was recorded from larval lamprey (whole animals and in vitro brain/spinal cord preparations).
- Linear regression analysis was used to compare the slopes of BP and phi versus T.
- Statistical analysis was performed to assess the significance of changes in these parameters.
Main Results:
- In whole animals, burst proportion (BP) significantly increased as cycle time (T) decreased (faster swimming).
- Intersegmental phase lag (phi) in whole animals did not significantly change with cycle time.
- In vitro preparations showed similar trends, with BP negatively correlated with T, though not always statistically significant, and relatively constant phase lags.
Conclusions:
- Increased BP with decreased cycle time likely compensates for increased viscous resistance at higher swimming speeds.
- Constant intersegmental phase lags ensure consistent relative timing of neural activity, maintaining an effective S-wave for efficient swimming across different speeds.