title: Evidence for hybridisation between Paramacropostrongylus iugalis and P. typicus (Nematoda:Strongyloidea) in grey kangaroos, Macropus fuliginosus and M. giganteus, in a zone of sympatry in eastern Australia.
abstract: Specimens of Paramacropostrongylus iugalis and P. typicus, collected from eastern (Macropus giganteus) and western (M. fuliginosus) grey kangaroos in New South Wales and Queensland, were examined morphologically and electrophoretically at 4 enzyme loci previously demonstrated to be diagnostic between the 2 species. Collections of P. iugalis from M. giganteus from outside the zone of sympatry of the 2 kangaroo species conformed electrophoretically and morphologically with previous studies. Within the zone of sympatry, the 2 nematode species were distinguishable electrophoretically, with most P. iugalis occurring in M. giganteus and all P. typicus occurring in M. fuliginosus. Some specimens of P. iugalis were identified in M. fuliginosus and, in both host species, nematodes were encountered with electrophoretic profiles intermediate between P. iugalis and P. typicus. The frequent occurrence in these specimens of heterozygotes suggested that the genetic barriers between the 2 nematode species were not complete and that genetic interchange (i.e. hybridisation) was occurring.
authors.affiliation: Department of Veterinary Science, University of Melbourne, Werribee, Victoria, Australia. nbc@clyde.its.unimelb.edu.au
authors.forename: N B
authors.initials: NB
authors.lastname: Chilton
authors.forename: I
authors.initials: I
authors.lastname: Beveridge
authors.forename: H
authors.initials: H
authors.lastname: Hoste
authors.forename: R B
authors.initials: RB
authors.lastname: Gasser
mesh_terms: D000483:Alleles; D000818:Animals; D017238:Genes, Helminth; D006824:Hybridization, Genetic; D007527:Isoenzymes / Q000737:chemistry / Q000235:genetics; D007614:Macropodidae / Q000469:parasitology*; D008297:Male; D009517:New South Wales; D011793:Queensland; D013270:Stomach / Q000469:parasitology; D017206:Strongylida Infections / Q000469:parasitology / Q000662:veterinary*; D013320:Strongyloidea / Q000033:anatomy & histology / Q000145:classification / Q000201:enzymology / Q000235:genetics*
chemical_list: D007527:Isoenzymes