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  • 1
    Electronic Resource
    Electronic Resource
    Daphnia obtusa Kurz, 1874 emend Scourfield, 1942 from Australia (1996)
    Springer
    Hydrobiologia 333 (1996), S. 195-199 
    Details
    ISSN: 1573-5117
    Keywords: Daphnia obtusa ; Australia ; Cladocera ; biogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Specimens of Daphnia found in Lake Burley Griffin in December 1994 (austral summer), were taken into laboratory culture where males and ephippial females were generated. All the key morphological features of the females, males and ephippia (resting eggs) fitted those described for Daphnia obtusa Kurz, 1874 emend Scourfield, 1942 not yet recorded from Australia. There were major differences between the specimens from Lake Burley Griffin and descriptions of D. jollyi, the only other species from the subgenus Daphnia in Australia which has a fringe of long setae in the mid-region of the ventral margin of the carapace. In addition, D. jollyi is endemic to the south-west of Western Australia. The discovery of D. obtusa does not provide evidence for the existence of this taxon in Australia since the breakup of Gondwana in the Cretaceous. Its discovery in an artificial lake opened in 1964, and which has been extensively sampled without detection of this species over the last 10–20 years, suggests a recent introduction from overseas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013433
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The systematics of Australian Daphnia (Cladocera: Daphniidae). Species descriptions and keys (1988)
    Springer
    Hydrobiologia 166 (1988), S. 95-161 
    Details
    ISSN: 1573-5117
    Keywords: Cladocera ; Daphnia ; Species descriptions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Species of Daphnia discovered in Australia during the last 10–15 years have provided important new evidence of an ancient, Pangaean, origin of the genus. Recent biogeographical and genetic work has also suggested an ancient origin for individual species within the D. carinata complex in Australia. The genetic studies highlighted the complexities of population structure in the group. However, in combination with morphometric studies, they also provided solutions to some difficult taxonomic problems. Since the systematic difficulties in the D. carinata complex reflect taxonomic problems fundamental to the genus, the Australian species have assumed a particular interest. New data on the distribution of the six taxa currently recognised in Australia, and detailed descriptions of both males and females of D. occidentalis, D. lumholtzi, D. cephalata, D. nivalis and D. carinata (sensu lato) and the female of D. jollyi (no male of D. jollyi has been found), are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028632
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The systematics of Australian Daphnia (Cladocera: Daphniidae). Electrophoretic analyses of the Daphnia carinata complex (1988)
    Springer
    Hydrobiologia 166 (1988), S. 183-197 
    Details
    ISSN: 1573-5117
    Keywords: Cladocera ; Daphnia ; genetic variation ; Australia ; phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic variation at eleven allozyme loci was scored in approximately 1600 individual Daphnia. The samples included representatives of all nine taxa described from the D. carinata complex in Australia. Principal coordinates and cluster analyses revealed only three groups of genotypes within the complex, corresponding to the taxa D. cephalata, D. nivalis, and a conglomerate of all other taxa described from the complex, D. carinata (sensu lato). These results are consistent with recent multivariate morphological analyses of the complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028634
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  • 4
    Electronic Resource
    Electronic Resource
    The systematics of Australian Daphnia (Cladocera: Daphniidae). Multivariate morphometrics (1988)
    Springer
    Hydrobiologia 166 (1988), S. 163-182 
    Details
    ISSN: 1573-5117
    Keywords: Cladocera ; Daphnia ; multivariate morphometrics ; Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Forty nine characters were measured in each of 76 male and 200 female Daphnia including specimens from all eleven taxa described from the genus in Australia, except D. jollyi. Separate multivariate analyses (cluster, principal components and discriminant) of males and females each revealed only five morphological groups in the genus corresponding to the species D. occidentalis, D. lumholtzi, D. cephalata, D. nivalis, and a conglomerate of all other taxa described from the D. carinata complex, D. carinata (sensu lato). Interpretation of the male results was straightforward, but that for females was not because of the occurrence of an environmentally induced seasonal change in morphology (cyclomorphosis) in females. Log transformations of the female data successfully isolated the effects of cyclomorphosis. The seasonal morphs formed two groups which were further differentiated into taxonomic groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028633
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Phenetic and cladistic analyses of the phylogenetic relationships within the genus Daphnia worldwide (1986)
    Springer
    Hydrobiologia 140 (1986), S. 105-124 
    Details
    ISSN: 1573-5117
    Keywords: Daphnia ; Cladocera ; phylogeny ; phenetics ; cladistics ; limnology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phenetic and cladistic analyses of 43 species of Daphnia, based on 42 morphological characters scored from the literature, substantiated the basic split of the genus into two subgenera, Daphnia and Ctenodaphnia. However, the number of sound shared-derived characters supporting this split in the cladistic analyses was poor. No robust structuring was observed within the subgenus Daphnia in the phenetic analyses. Cladistic analyses provided evidence of only two well-defined clades within this subgenus, corresponding to a ‘D. obtusa group’ and a ‘D. ambigua group’, distinct from all other taxa. In the subgenus Ctenodaphnia, both phenetic and cladistic analyses highlighted the distinct differences between D. lumholtzi and all other members of the subgenus. D. magna, and D. cephalata together with D. ornithocephala, also constituted outliers in the phenetic analyses. In the cladistic analyses, D. magna, D. cephalata together with D. ornithocephala, D. carinata together with D. nivalis, and a ‘D. atkinsoni group’, each formed separate clades. The relationships between these clades, and all other taxa within the Ctenodaphnia could not be determined in more detail. The lack of fine definition emphasised the inadequacy of many of the published descriptions of Daphnia taxa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007564
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    Paper (German National Licenses)
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