Neural regulation of discontinuous gas exchange in Periplaneta americana

dc.contributor.authorWoodman, James
dc.contributor.authorCooper, Paul
dc.contributor.authorHaritos, Victoria S
dc.date.accessioned2015-12-10T22:23:14Z
dc.date.issued2008
dc.date.updated2015-12-09T09:05:51Z
dc.description.abstractPatterns 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 VCO2 in medium to large sized live terrestrial arthropods. Using Periplaneta americana at four oxygen levels (40%, 21%, 10% and 2% at 25 °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 CO2 production during a burst, moderate CNS output coinciding with CO2 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 CO2 peaks. At 10% oxygen, VCO2 was significantly elevated during the inter-burst period in association with almost constant moderate CNS output between the periodic large CNS output. At 2% oxygen, DGE and large CNS output are lost to continuous CO2 release and largely continuous moderate CNS output. As previously reported for this species, a central pattern generator for ventilation in the metathoracic ganglion is supported and we infer the presence of localized oxygen chemoreceptors based on clear CNS response to a change in oxygen tension.
dc.identifier.issn0022-1910
dc.identifier.urihttp://hdl.handle.net/1885/52685
dc.publisherElsevier
dc.sourceJournal of Insect Physiology
dc.subjectKeywords: oxygen; cockroach; gas exchange; measurement method; nervous system; respiration; animal; article; central nervous system; lung gas exchange; Periplaneta; physiology; respiratory function; Animals; Central Nervous System; Oxygen; Periplaneta; Pulmonary Ga CNS; Discontinuous gas exchange; Metathoracic ganglion; Oxygen tension; Respirometry
dc.titleNeural regulation of discontinuous gas exchange in Periplaneta americana
dc.typeJournal article
local.bibliographicCitation.lastpage480
local.bibliographicCitation.startpage472
local.contributor.affiliationWoodman, James, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationCooper, Paul, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationHaritos, Victoria S, CSIRO
local.contributor.authoremailu3305695@anu.edu.au
local.contributor.authoruidWoodman, James, u3305695
local.contributor.authoruidCooper, Paul, u8701498
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor060808 - Invertebrate Biology
local.identifier.absfor060805 - Animal Neurobiology
local.identifier.ariespublicationu9511635xPUB252
local.identifier.citationvolume54
local.identifier.doi10.1016/j.jinsphys.2007.11.006
local.identifier.scopusID2-s2.0-38749102337
local.identifier.thomsonID000253355900018
local.identifier.uidSubmittedByu9511635
local.type.statusPublished Version

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