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  • 1
    Electronic Resource
    Electronic Resource
    Dibromo(1,4-dioxan)tin(II): the crystal structure (1977)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 307-308 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740877003495
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  • 2
    Electronic Resource
    Electronic Resource
    An attractant pheromone with common properties in three reptile ticks (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 99-100 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Female reptile ticks produce a pheromone which attracts conspecific, and less strongly, non-conspecific males over short distances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944550
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  • 3
    Electronic Resource
    Electronic Resource
    Niche changes between parasite populations: An example from ticks on reptiles (1982)
    Springer
    Oecologia 55 (1982), S. 77-80 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two Australian tick species Aponomma hydrosauri and Amblyomma albolimbatum have the same major host species, the lizard Trachydosaurus rugosus. While females of Amb. albolimbatum are most often attached in the ears and on the neck of their hosts, Ap. hydrosauri females prefer to attach further back, under the forearms and on the back. Males show the same interspecific difference but there is also a difference between populations. Ap. hydrosauri males from populations in contact with Amb. albolimbatum attach more often in posterior positions than Ap. hydrosauri males from populations isolated from Amb. albolimbatum. These differences were found in both field populations and laboratory reared ticks. Phylogenetic evidence suggests that the change in male attachment site between Ap. hydrosauri populations followed the colonization of T. rugosus. We propose that the most likely reason for the change of attachment sites has been interspecific interactions with Amb. albolimbatum and that competition has been for space for efficient reception of female signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386721
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of similar aggregation pheromones on the microhabitat choice of two parapatric species of reptile tick (Acari: Ixodidae) (1982)
    Springer
    Oecologia 55 (1982), S. 364-368 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Non-specificity of part of the sex pheromone system of three species of reptile tick has previously been suggested to result in reproductive interference between the species when they attach to the same host (Andrews et al. 1982). Two of the species, Aponomma hydrosauri and Amblyomma limbatum, have common aggregation pheromones which act when the ticks are detached from their hosts. As each species tends to occupy spatially separated microhabitats, the similarity of the aggregation pheromone could lead to interference between species when off their hosts by inducing one species to move away from its preferred microhabitat into that occupied by the other species. This study demonstrates that coaggregations of both species do occur, but that neither species shows a statistically significant shift in microhabitat preference attributable to interactions between species. We suggest that the behaviours leading to microhabitat choice in each species override the influence of the common aggregation pheromone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376924
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  • 5
    Electronic Resource
    Electronic Resource
    Competition for sites of attachment to hosts in three parapatric species of reptile tick (1981)
    Springer
    Oecologia 51 (1981), S. 227-232 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Competition for sites of attachment to hosts by three species of reptile tick, Aponomma hydrosauri, Amblyomma albolimbatum and Amb. limbatum was investigated as a possible cause for the parapatric distributions found in these species throughout southern Australia. Two localities were chosen for detailed study; a boundary between Ap. hydrosauri and Amb. limbatum near Mt. Mary in the mid-north of South Australia and a boundary between Ap. hydrosauri and Amb. albolimbatum near Arno Bay on the Eyre Peninsula of South Australia. Comparisons of sites of attachment to hosts were made between hosts infested by one species of tick and hosts infested by two species of tick. At Mt. Mary, Ap. hydrosauri and Amb. limbatum adults attach more commonly in the ears and on the midback of their hosts, however, no evidence was found to suggest that competition between the species occurred for these sites. At Arno Bay, Amb. albolimbatum adults had similar sites of attachment to hosts as the other two species, however, significantly more of this species attach in the ears of their hosts. There is no difference in sites of attachment to hosts of Ap. hydrosauri females at Arno Bay and Mt. Mary. Ap. hydrosauri males at Arno Bay, however, show a shift in sites of attachment to hosts away from those sites occupied by Amb. albolimbatum males and females. This shift occurs only in cases where Amb. albolimbatum did not infest the same host. Although the shift in male Ap. hydrosauri sites of attachment to hosts can be explained in terms of past competition, there is no evidence to suggest that such competition in the past, or competition at present, maintains the parapatric boundaries found in these species of thick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540606
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  • 6
    Electronic Resource
    Electronic Resource
    Reproductive interference between three parapatric species of reptile tick (1982)
    Springer
    Oecologia 52 (1982), S. 281-286 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Reproductive interference between three species of reptile tick, Aponomma hydrosauri, Amblyomma albolimbatum and Amb. limbatum was investigated. Adults of two species attach together on the same lizard hosts in narrow overlap zones at parapatric boundaries between species, providing opportunities for interference. The possibility of reproductive interference was suggested because of similarities in the sexual communication systems. Three forms of interference were found in laboratory experiments. Firstly male movement to search for sexually receptive females was inhibited when females of two species were present on the same host, probably because of signal interference. Secondly, a nonspecific, short range attractant pheromone led males into non-conspecific courtship attempts which reduced the time for conspecific courtships. Thirdly Amb. albolimbatum males physically blocked the genitalia of female Ap. hydrosauri after unsuccessful non-conspecific courtship attempts. Field data showed this behaviour was common in both Amblyomma species after conspecific matings. Reproductive interference would reduce the fitness of each species in sympatry, and may contribute to the maintenance of the narrow parapatric boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363851
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  • 7
    Electronic Resource
    Electronic Resource
    Electrophoretic and morphological analysis of Paramacropostrongylus typicus (Nematoda: Strongyloidea), with the description of a new species, Paramacropostrongylus iugalis, from the eastern grey kangaroo Macropus giganteus (1993)
    Springer
    Systematic parasitology 24 (1993), S. 35-44 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An allozyme study of four populations of Paramacropostrongylus typicus from Macropus fuliginosus and M. giganteus detected the presence of a distinct species, Paramacropostrongylus iugalis n. sp., which is described from the stomach of the eastern grey kangaroo Macropus giganteus. The description is based on samples possessing fixed allelic differences at 10 of 37 enzyme loci examined, minor morphological differences from its congener P. typicus in M. fuliginosus, and presumed limitation to a single host species, M. giganteus. Its differentiation from P. typicus is more clearly demonstrated by biochemical characters than by morphological ones. The two parasite species probably co-speciated with their hosts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006943
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  • 8
    Electronic Resource
    Electronic Resource
    A morphological and electrophoretic study of Rugopharynx zeta (Johnston & Mawson, 1939) (Nematoda: Strongyloidea), with the description of a new species, R. mawsonae, from the black-striped wallaby Macropus dorsalis (Marsupialia: Macropodidae) (1994)
    Springer
    Systematic parasitology 27 (1994), S. 159-171 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Rugopharynx zeta (Johnston & Mawson) (Nematoda: Strongyloidea) is redescribed from the rock wallabies Petrogale penicillata penicillata, P. p. herberti, P. inornata and P. assimilis from Queensland and New South Wales, Australia. Specimens formerly assigned to this nematode taxon from the wallabies Macropus dorsalis and M. parma are treated as a new species, R. mawsonae. R. mawsonae n. sp. differs from R. zeta in the shape of the dorsal ray, length of spicules, morphology of spicule tip, length of female tail and position of deirid. The morphological differences are supported by electrophoretic data. R. zeta and R. mawsonae n. sp. had fixed genetic differences at 45.0% of the 21 enzyme loci examined, while each differed at 38.1% and 45.0% of loci respectively from the morphologically distinct R. delta (Johnston & Mawson). The known host and geographical distributions of R. zeta and R. mawsonae n. sp. are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008478
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  • 9
    Electronic Resource
    Electronic Resource
    Relationships within theRugopharynx delta species complex (Nematoda: Strongyloidea) from Australian marsupials inferred from allozyme electrophoretic data (1995)
    Springer
    Systematic parasitology 32 (1995), S. 149-156 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Relationships between the strongyloid nematodesRugopharynx delta, R. zeta, R. omega, R. longibursaris, R. mawsonae andR. sigma, all from macropodid marsupials, were investigated using allozyme data. The phylogenetic trees derived from the electrophoretic data set were congruent with those of the hosts and were consistent with the hypothesis that the species complex originated in pademelons of the genusThylogale and diversified in rock-wallabies (Petrogale spp.) and scrub wallabies of the subgenusNotamacropus. Host switching is evident only between closely related macropodid taxa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009514
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  • 10
    Electronic Resource
    Electronic Resource
    Electrophoretic comparison of Rugopharynx longibursaris Kung and R. omega Beveridge (Nematoda: Strongyloidea), with the description of R. sigma n. sp. from pademelons, Thylogale spp. (Marsupialia: Macropodidae) (1993)
    Springer
    Systematic parasitology 26 (1993), S. 159-169 
    Details
    ISSN: 1573-5192
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract An electrophoretic comparison of the nematodes Rugopharynx longibursaris and R. omega, both from Macropus rufogriseus in south-eastern Australia, revealed fixed genetic differences at 4.5% of the 23 enzyme loci examined. The electrophoretic data do not therefore reject the null hypothesis that the two taxa are conspecific. R. longibursaris was found in Tasmania and in the western mainland population of M. rufogriseus, while R. omega occurred only in the eastern mainland population. Implications for the taxonomic status of the western host population are considered. Specimens formerly assigned to R. omega, from Thylogale stigmatica from Queensland, were found to differ at 45.0% of enzyme loci from specimens from M. rufogriseus. Morphological examination revealed differences in the shape of the buccal capsule, the position of the deirid, the morphology of the spicule tip and the presence of a gubernaculum. A new species, R. sigma, is erected for specimens from T. stigmatica, T. thetis and T. calabyi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009723
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