Influence of carbon dioxide gas on German cockroach (Dictyoptera: Blattellidae) knockdown, recovery, movement and feeding

Carbon dioxide anaesthesia differentially affects the knockdown and recovery of cockroaches, depending on the strain and the length of time that the colony has been subjected to a CO2 regime. Adult males from two laboratory and two field-collected strains of German cockroaches, Blattella germanica,...

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Bibliographic Details
Published in:	Physiological entomology Vol. 30; no. 2; pp. 144 - 150
Main Authors:	Branscome, D.D, Koehler, P.G, Oi, F.M
Format:	Journal Article
Language:	English
Published:	Oxford, UK; Malden, USA Blackwell Science Ltd 01-06-2005 Wiley Subscription Services, Inc
Subjects:	adverse effects Anaesthesia anesthesia bait consumption baits behaviour Blattella germanica Blattellidae carbon dioxide carbon dioxide anesthesia consumption duration exposure duration feeding behavior food intake German cockroach hydramethylnon insect behavior locomotion mortality movement mvement impairment strain differences toxic bait toxic baits
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Summary:	Carbon dioxide anaesthesia differentially affects the knockdown and recovery of cockroaches, depending on the strain and the length of time that the colony has been subjected to a CO2 regime. Adult males from two laboratory and two field-collected strains of German cockroaches, Blattella germanica, are knocked down within 7-45 s after exposure to CO2. After 5 min of CO2 exposure, presumptive recovery (i.e. the time for the cockroach to right itself after knockdown) for laboratory strains occurs significantly sooner than for field-collected strains. Control cockroaches, exposed to compressed air rather than CO2, exit harbourage cups rapidly (<or=3.20 min). However, although allowed a recovery period of 5 min, significant movement impairment occurs for all cockroach strains anaesthetized with CO2. Carbon dioxide exposure significantly reduces consumption of 2.15% hydramethylnon bait and delays mortality even when 24 h is allowed for recovery before bait placement. Cockroaches allowed to recover for 48 h after 5 min of CO2 exposure consume significantly more bait and die significantly faster than CO2 exposed groups allowed 24 h of recovery, and mortality is not significantly different from nonanaesthetized bait-fed controls.
Bibliography:	ArticleID:PHEN439 istex:547AA3211595183CD270EC2036DE713FA6F2B36A ark:/67375/WNG-XRSRD802-L ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0307-6962 1365-3032
DOI:	10.1111/j.1365-3032.2005.00439.x