Document Detail


Plastic and evolved responses of larval tracheae and mass to varying atmospheric oxygen content in Drosophila melanogaster.
MedLine Citation:
PMID:  15339952     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Structural changes in the tracheal system during development have the potential to allow insects to compensate for varying oxygen availability. Despite possible compensation, oxygen level during development may also affect insect body size. We investigated how atmospheric oxygen level affects the dimensions of the main dorsal tracheae (DT) and masses of larval Drosophila melanogaster (Meigen) reared for up to six generations in 10%, 21% or 40% O2 at 25 degrees C. Wandering-stage third-instar larvae were weighed every other generation, and the dimensions of the DT were measured. Hypoxia produced significantly lighter larvae after one generation of exposure, while hyperoxia did not affect larval mass. Atmospheric oxygen content did not significantly change the diameters of the anterior portions of the main tracheae; however, the posterior diameters were strongly affected. During the first generation of exposure, tracheal diameters were inversely proportional to rearing oxygen levels, demonstrating that developmental plasticity in DT diameters can partially (8-15%) compensate for variation in atmospheric oxygen level. After multiple generations in differing atmospheres and two further generations in 21% O2, larvae had tracheal diameters inversely related to their historical oxygen exposure, suggesting that atmospheric oxygen can produce heritable changes in insect tracheal morphology.
Authors:
Joanna R Henry; Jon F Harrison
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  207     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-09-01     Completed Date:  2005-01-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3559-67     Citation Subset:  IM    
Affiliation:
Section of Organismal, Integrative and Systems Biology, School of Life Sciences, Arizona State University, PO Box 874601, Tempe, AZ 85287-4601, USA. joanna.henry@asu.edu
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological*
Analysis of Variance
Animal Structures / anatomy & histology,  drug effects*
Animals
Body Size*
Drosophila melanogaster / anatomy & histology,  growth & development*
Larva / growth & development
Oxygen / pharmacology*
Partial Pressure
Washington
Chemical
Reg. No./Substance:
7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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