Document Detail


Dynamic mechanical oscillations during metamorphosis of the monarch butterfly.
MedLine Citation:
PMID:  18682363     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The mechanical oscillation of the heart is fundamental during insect metamorphosis, but it is unclear how morphological changes affect its mechanical dynamics. Here, the micromechanical heartbeat with the monarch chrysalis (Danaus plexippus) during metamorphosis is compared with the structural changes observed through in vivo magnetic resonance imaging (MRI). We employ a novel ultra-sensitive detection approach, optical beam deflection, in order to measure the microscale motions of the pupae during the course of metamorphosis. We observed very distinct mechanical contractions occurring at regular intervals, which we ascribe to the mechanical function of the heart organ. Motion was observed to occur in approximately 15 min bursts of activity with frequencies in the 0.4-1.0 Hz range separated by periods of quiescence during the first 83 per cent of development. In the final stages, the beating was found to be uninterrupted until the adult monarch butterfly emerged. Distinct stages of development were characterized by changes in frequency, amplitude, mechanical quality factor and de/repolarization times of the mechanical pulsing. The MRI revealed that the heart organ remains functionally intact throughout metamorphosis but undergoes morphological changes that are reflected in the mechanical oscillation.
Authors:
Andrew E Pelling; Paul R Wilkinson; Richard Stringer; James K Gimzewski
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the Royal Society, Interface / the Royal Society     Volume:  6     ISSN:  1742-5689     ISO Abbreviation:  J R Soc Interface     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-11-21     Completed Date:  2009-03-26     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  101217269     Medline TA:  J R Soc Interface     Country:  England    
Other Details:
Languages:  eng     Pagination:  29-37     Citation Subset:  IM    
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Biological Clocks / physiology*
Butterflies / anatomy & histology,  physiology*
Heart / anatomy & histology*,  physiology
Heart Rate / physiology*
Magnetic Resonance Imaging
Metamorphosis, Biological / physiology*
Pupa / anatomy & histology,  physiology
Comments/Corrections

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