Neural regulation of discontinuous gas exchange in Periplaneta americana

Journal of Insect Physiology
James D WoodmanVictoria S Haritos

Abstract

Patterns of gas exchange among terrestrial arthropods are highly variable from continuous to discontinuous with discretely partitioned phases. The underlying initiation and co-ordination of these patterns is relatively poorly understood. Here we present a novel method for the simultaneous measurement of central nervous system (CNS) activity of the metathoracic ganglion and VCO(2) in medium to large sized live terrestrial arthropods. Using Periplaneta americana at four oxygen levels (40%, 21%, 10% and 2% at 25 degrees C; n=6 per treatment), we present minimally invasive visualization of nervous output relative to typical resting discontinuous gas exchange (DGE) data for the first time. DGE was maintained when cockroaches were exposed to hyperoxia or moderate hypoxia, but was lost in severe hypoxia. CNS activity was manifested in three signal types: large CNS output coinciding with peak CO(2) production during a burst, moderate CNS output coinciding with CO(2) sawtoothing and fluttering, and minimal CNS activity during the closed phase of DGE in normoxia. Large and moderate CNS outputs were associated with observed abdominal pumping and congruent CO(2) peaks. At 10% oxygen, VCO(2) was significantly elevated during the inter-burst...Continue Reading

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Citations

Nov 8, 2014·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Hamish BartrimCraig R White
Dec 17, 2009·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Paul D CooperChristine Donnelly
Dec 26, 2007·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·James D WoodmanPaul D Cooper
Jun 16, 2009·Journal of Insect Physiology·H L Contreras, T J Bradley
Jun 16, 2009·Journal of Insect Physiology·Thomas D Förster, Stefan K Hetz
Jan 11, 2011·Journal of Insect Physiology·C Helene Basson, John S Terblanche
Feb 13, 2013·Journal of Insect Physiology·Helmut KäferAnton Stabentheiner
Sep 18, 2020·Insects·Waseem AbbasTheodore A Evans
Aug 26, 2011·The Journal of Experimental Biology·Philip G D Matthews, Craig R White

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