MESOSTIGMATA Passalid Mites - Acarology XI: Proceedings of...

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241 A PRELIMINARY INVESTIGATION OF CUES USED BY MESOSTIGMATIC MITES TO LOCATE THEIR PASSALID BEETLE HOSTS Sarah M. Satterlee 1 and Norman J. Fashing 2 1 8075 Sky Blue Drive, Alexandria, VA 22315, USA . 2 Department of Biology, The College of William and Mary, PO Box 8795, Williamsburg, VA 23187-8795, USA . Abstract Four species of mesostigmatic mites associated with the passalid beetle Odontotaenius disjunctus (Illiger) (Coleoptera : Passalidae) were tested to de±ne the cues used for host location. When placed in a free- choice disk olfactometer, mites were attracted to vials containing passalid beetles with which they had no physical contact. Mites were also attracted to vials from which a passalid beetle was removed just prior to testing. There was no signi±cant difference between vials in control experiments when all were empty. Most importantly, mites were attracted to water washes of chloroform extracts taken from passalid beetle cuticle. Therefore chemical cues (kariomones) emanating from the host cuticle play an important role in the location of hosts by passalid mites. Using thin-layer chromatography, the attractant was found to be highly polar; however the speci±c chemicals in the attractant were not identi±ed. I NTRODUCTION Members of the family Passalidae are large, slow mov- ing, subsocial beetles that inhabit decaying logs and seldom fly (Gray 1946; Pearse et al . 1936). Over 500 species of Passalidae have been described (Reyes-Cas- tillo 1970), and, although most have not been examined for mites, over 200 species of mite associates from 24 families have been recovered from them (Hunter 1993). In fact the best known passalid species, Odontotaenius disjunctus (Illiger), an inhabitant of the eastern deciduous forest of the United States, is known to have a close association with sixteen species of mites representing 11 families (DelFnado and Baker 1975). ±or most of these mite species (hereafter referred to as “passalid mites”), the relationship is thought to be phoretic, however little is known concerning the biology of most. Pearse et al . (1936) considered parasitism a possibility in two species, and it has been demonstrated that females of one species ( Cosmolaelaps trifdus (Pearse and Wharton)) cannot produce offspring if not associated with an adult host beetle (Mollin and Hunter 1964). In addition, all developmental instars of Diarthrophallus quercus (Pearse and Wharton) are found on adult beetles (DelFnado and Baker 1975). In the latter two cases a commensal relationship has been suggested with adult mites gain- ing nourishment from beetle salivary secretions (Mollin and Hunter 1964). It is possible that phoresy is but one of the relationships passalid mites have with their hosts and that further study will reveal other interactions as well. Whatever the relationship, it is apparent that the beetle host plays a signiFcant role in the life histories A c a r o l o g y XI / Acarology XI: Proceedings o± the International Congress. M
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This note was uploaded on 05/01/2011 for the course BIOLOGY 2114 taught by Professor Gd during the Spring '10 term at Georgia Southern University .

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MESOSTIGMATA Passalid Mites - Acarology XI: Proceedings of...

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