PMID: 12770161May 29, 2003Paper

Environmental hypoxia affects osmotic and ionic regulation in freshwater midge-larvae

Journal of Insect Physiology
Frank Scholz, I Zerbst-Boroffka

Abstract

The effect of anaerobic metabolism on the osmotic and ionic regulation of the extracellular fluid was examined. Larvae of three species, characterized by different hypoxia tolerance, were studied: Chaoborus crystallinus, Culex pipiens and Chironomus gr. plumosus. The use of the capillary electrophoresis technique made it possible to determine approximately 15 different ions from individual hemolymph samples. The hemolymph concentration of both inorganic and organic anions and cations as well as the osmolality were measured. A correlation between the hypoxia tolerance and the capability to avoid net changes in the ion concentration or in the osmolality of the three species studied here is proposed: Culex larvae, which have the lowest hypoxia tolerance, show a very large and very rapid lactate accumulation in their hemolymph under experimental hypoxia. This lactate accumulation is not compensated for by a change in the concentration of any other ion. Chaoborus larvae, with a medium hypoxia tolerance, utilize their very large hemolymph malate pool as a source of anaerobic energy. It is converted into succinate, thus inducing little net changes in the sum of the anions. There is a marked increase of the hemolymph osmolality, though...Continue Reading

Citations

Nov 19, 2003·Biochemical and Biophysical Research Communications·Maho OgoshiYoshio Takei
Jun 16, 2005·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Rosa M Martínez-AlvarezAmalia E Morales
Mar 16, 2001·Journal of Insect Physiology·W W. Hoback, D W. Stanley
Feb 27, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·J A Sulikowski, L A Maginniss
Oct 24, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·S L EdwardsT Toop
Jan 31, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·S L EdwardsC-M Tse
Jan 31, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Keith P ChoeJames B Claiborne
Jan 12, 2000·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·K P ChoeJ B Claiborne
Dec 10, 2003·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Neil HazonCraig E Franklin
Jul 11, 2002·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Joy J Leaner, Robert P Mason
May 10, 2013·Electrophoresis·Ala A AlhusbanRosanne M Guijt
Mar 25, 2005·Journal of Neurophysiology·Dorothee GünzelWolf-Rüdiger Schlue
May 28, 2019·Journal of Vector Ecology : Journal of the Society for Vector Ecology·Petrina H Johnson, Richard C Russell
Feb 28, 2006·Journal of Insect Physiology·Thomas A GorrPablo Wappner

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