J. Roberts

Publications157
h-index34
Citations3,341
Highly Influential Citations206
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Molecular phylogenetics of the spider family Micropholcommatidae (Arachnida: Araneae) using nuclear rRNA genes (18S and 28S).
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Synchronous polyandry and multiple paternity in the frogCrinia georgiana(Anura: Myobatrachidae)
TLDR
Genetic analyses, using allozyme electrophoresis, of offspring from two matings indicated that at least two of three possible males fathered offspring, suggesting multiple paternity may be more common in frogs than has been reported.
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Molecular phylogenetic dating supports an ancient endemic speciation model in Australia's biodiversity hotspot.
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Burrow building in seabird colonies: a soil-forming process in island ecosystems
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Molecular phylogeny of the Australian frog genera Crinia, Geocrinia, and allied taxa (Anura: Myobatrachidae).
TLDR
A mitochondrial gene tree for representative species of all the genera in the subfamily Myobatrachinae, with special emphasis on Crinia and Geocrinia, concludes that the phylogenetic relationships among Crinia species are well resolved with strong support for a number of distinct monophyletic clades, but more data are required to resolve relationships among these major Crinia clades.
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Embryonic Respiration and Oxygen Distribution in Foamy and Nonfoamy Egg Masses of the Frog Limnodynastes tasmaniensis
TLDR
Numerical models of O2, diffusion through egg masses confirmed the absence of convection in L. tasmaniensis nests but indicated that convection may be required in larger aquatic egg masses of other species.
View on U Chicago Press
Parasite loads in parthenogenetic and sexual lizards (Heteronotia binoei) : support for the Red Queen hypothesis
TLDR
It is reported that parthenogenetic individuals of the Heteronotia binoei species complex are much more prone to infection by mites than are their sexual relatives, which accords with a central prediction of the Red Queen hypothesis.
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Sperm traits of the quacking frog, Crinia georgiana: intra- and interpopulation variation in a species with a high risk of sperm competition
TLDR
Heterogeneity in the reproductive environment, a complex genetic background in the determination of sperm characteristics and varying levels of developmental noise as potential contributors to the observed variation in sperm traits are discussed.
View on Springer
Burrowing seabirds drive decreased diversity and structural complexity, and increased productivity in insular-vegetation communities
TLDR
Dense, productive and species-poor colony vegetation supports the assemblage-level thinning hypothesis as the mechanism for vegetation change, but it is argued that prominent colony species are simply better adapted to high nutrient loads and frequent disturbance.
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Biogeography and speciation of terrestrial fauna in the south‐western Australian biodiversity hotspot
TLDR
Critically analyse datasets with explicit supporting phylogenetic data and estimates of the time since divergence for all available elements of the terrestrial fauna and compare these datasets to those available for plants, and derive four testable models of historical biogeography for animal taxa in SWWA.
View on Wiley
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