HOST SPECIFICITY IN THE SLAVE-MAKING ANT HARPAGOXENUS-CANADENSIS SMITH,M.R

Citation
J. Heinze et al., HOST SPECIFICITY IN THE SLAVE-MAKING ANT HARPAGOXENUS-CANADENSIS SMITH,M.R, Canadian journal of zoology, 70(1), 1992, pp. 167-170
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Zoology
Journal title
ISSN journal
0008-4301
Volume
70
Issue
1
Year of publication
1992
Pages
167 - 170
Database
ISI
SICI code
0008-4301(1992)70:1<167:HSITSA>2.0.ZU;2-3
Abstract
The slave-making ant Harpagoxenus canadensis frequently parasitizes tw o host species in the genus Leptothorax (subgenus Leptothorax s.str.) which are part of the L. "muscorum" complex and are currently referred to as Leptothorax sp. A and Leptothorax sp. B. A sympatric member of this subgenus, L. retractus, is rarely enslaved. Of 48 complete slave- maker colonies from various sites, 26 contained only Leptothorax sp. A slaves (54.2%), 11 contained only Leptothorax sp. B slaves (22.9%), a nd 11 contained slaves of both species (22.9%). Of 65 partial slave-ma ker colonies from one site, 10 contained only Leptothorax sp. A slaves (15.4%), 55 contained only Leptothorax sp. B slaves (84.6%), and none contained slaves of both species. Leptothorax retractus was common at some sites but was never found as a slave in this study. Differences in host-utilization patterns within and between populations might refl ect differing host densities but could be influenced by genetic or lea rned predispositions of the parasites or differential interspecific co mpatibilities among the various species. Possible collector bias must also be considered. Female reproductives of the host species (n = 13) were occasionally found in slave-maker nests. Most of these were Lepto thorax sp. A intermorphs (workerlike females; n = 11) and were insemin ated but not egg laying. The only Leptothorax sp. A gynomorph (a prima rily winged female) was uninseminated and not egg laying, and the only Leptothorax sp. B gynomorph could not be dissected.