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dc.contributor.authorGroenewald, B.
dc.contributor.authorBazelet, C.
dc.contributor.authorPotter, C.P.
dc.contributor.authorTerblanche, J.S.
dc.date.accessioned2014-02-03T10:00:39Z
dc.date.available2014-02-03T10:00:39Z
dc.date.issued2013
dc.identifier.citationGroenewald, B., Bazelet, C., Potter, C.P. and Terblanche, J.S. (2013). Gas exchange patterns and water loss rates in the Table Mountain cockroach, Aptera fusca (Blattodea: Blaberidae). Journal of Experimental Biology, 216, pp 3844-3853.en
dc.identifier.urihttp://hdl.handle.net/123456789/1363
dc.description.abstractThe importance of metabolic rate and/or spiracle modulation for saving respiratory water is contentious. One major explanation for gas exchange pattern variation in terrestrial insects is to effect a respiratory water loss (RWL) saving. To test this, we measured the rates of CO2 and H2O release (VCO2 and VH2O, respectively) in a previously unstudied, mesic cockroach, Aptera fusca, and compared gas exchange and water loss parameters among the major gas exchange patterns (continuous, cyclic, discontinuous gas exchange) at a range of temperatures. Mean VCO2, VH2O and VH2O per unit VCO2 did not differ among the gas exchange patterns at all temperatures (P>0.09). There was no significant association between temperature and gas exchange pattern type (P=0.63). Percentage of RWL (relative to total water loss) was typically low (9.79±1.84%) and did not differ significantly among gas exchange patterns at 15°C (P=0.26). The method of estimation had a large impact on the percentage of RWL, and of the three techniques investigated (traditional, regression and hyperoxic switch), the traditional method generally performed best. In many respects, A. fusca has typical gas exchange for what might be expected from other insects studied to date (e.g. VCO2, VH2O, RWL and cuticular water loss). However, we found for A. fusca that VH2O expressed as a function of metabolic rate was significantly higher than the expected consensus relationship for insects, suggesting it is under considerable pressure to save water. Despite this, we found no consistent evidence supporting the conclusion that transitions in pattern type yield reductions in RWL in this mesic cockroach.en
dc.description.sponsorshipNRFen
dc.format.extent548014 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherCompany of Biologistsen
dc.subjectgas exchangeen
dc.subjectmetabolic rateen
dc.titleGas exchange patterns and water loss rates in the Table Mountain cockroach, Aptera fusca (Blattodea: Blaberidae)en
dc.typeJournalArticlesen
dc.cibjournalJournal of Experimental Biologyen
dc.cibprojectLarge-scale patterns in diversityen


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