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Exp Appl Acarol

Title:		Chemical alarm and defence in the oribatid mite Collohmannia gigantea (Acari: Oribatida)
Author(s):		Raspotnig G;
Address:		"Institute of Zoology, Karl-Franzens-University, Universitatsplatz 2, A-8010, Graz, Austria. guenther.raspotnig@uni-graz.at"
Journal Title:		Exp Appl Acarol
Year:		2006
Volume:		20060803
Issue:		3-Apr
Page Number:		177 - 194
DOI:		10.1007/s10493-006-9015-4
ISSN/ISBN:		0168-8162 (Print) 0168-8162 (Linking)
Abstract:		"The multicomponent oil gland secretion of Collohmannia gigantea, a middle-derivative mixonomatan oribatid mite, is demonstrated to possess alarm pheromonal and allomonal properties. Four components of the secretion, namely the monoterpenes neryl formate, neral, geranial and the aromatic 2-hydroxy- 6-methyl-benzaldehyde (2,6-HMBD), showed moderate to strong alarm pheromonal activity in adult mites. Naturally elicited response is due to neral (about 50% of the secretion) and probably 2,6-HMBD (only 5% of the secretion, but strong alarm pheromonal activity). This is the second report of an alarm pheromone in Oribatida. Tridecane and pentadecane (=the hydrocarbon fraction of the secretion) did not evoke evident behavioural reactions, and most likely serve as solvents and spreading agents for the pheromonal-active components. Alarm reactions were characterized by a short recognition phase (waving movements with legs I), followed by shrinking back and panic escape from the scent source. In addition, all six components of the oil gland secretion, including the hydrocarbons, exhibited strong allomonal properties against a model oribatid predator, the scydmaenid beetle, Euconnus (Tetramelus) oblongus. Considering the widespread semiochemical properties of oil gland secretions in astigmatid mites (=a highly derivative oribatid group), these results furnish evidence for a phylogenetically early origin of defensive and communicative roles of oil gland secretions in oribatids. These roles include alarm communication, defence and the production of anti-fungal compounds"
Keywords:		"Acaridae/drug effects/genetics/*physiology Animals Escape Reaction/drug effects/physiology Exocrine Glands/metabolism Gas Chromatography-Mass Spectrometry Oils, Volatile/analysis/isolation & purification Pheromones/isolation & purification/pharmacology/*p;"
Notes:		"MedlineRaspotnig, Gunther eng P 18486/FWF_/Austrian Science Fund FWF/Austria Research Support, Non-U.S. Gov't Netherlands 2006/08/10 Exp Appl Acarol. 2006; 39(3-4):177-94. doi: 10.1007/s10493-006-9015-4. Epub 2006 Aug 3"