Document Detail


Morphometric analysis of the larval branchial chamber in the dragonfly Aeshna cyanea Müller (Insecta, Odonata, Anisoptera).
MedLine Citation:
PMID:  15164369     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aquatic larvae of anisopteran dragonflies possess tracheal gills located in the rectum. Using stereological methods, we estimated the morphometric diffusing capacity for oxygen (D(MO2)) across the gill epithelium, i.e., from rectal water to the gill tracheoles, in the larvae of Aeshna cyanea. A 271-mg larva has a total branchial surface area of approximately 12 cm(2). Tracheoles make up 6% of the epithelial volume of the gills; the harmonic mean thickness of the water-tracheolar diffusion barrier is 0.27 microm and consists mainly of cuticle. The calculated D(MO2) is 23.0 microl min(-1) g(-1) kPa(-1), which, using published values for oxygen consumption in a similar species, would result in a mean driving pressure of 0.2 kPa at rest and 1.3 kPa during activity. Since these driving pressures are similar to those reported for other arthropods, we conclude that the D(MO2) of the gill is not rate-limiting for aerobic metabolism in Aeshna cyanea larvae. J Morphol. 261:81-91, 2004.
Authors:
Stefan Kohnert; Steven F Perry; Anke Schmitz
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of morphology     Volume:  261     ISSN:  0362-2525     ISO Abbreviation:  J. Morphol.     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-05-27     Completed Date:  2005-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0406125     Medline TA:  J Morphol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  81-91     Citation Subset:  IM    
Copyright Information:
Copyright 2004 Wiley-Liss, Inc.
Affiliation:
Institute for Zoology, Rheinische Friedrich-Wilhelms-University Bonn, 53115 Bonn, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Diffusion
Gills / physiology*,  ultrastructure
Insects / anatomy & histology,  physiology*
Larva / physiology*,  ultrastructure
Oxygen Consumption / physiology*

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