Publications

a description of isospora amphiboluri (apicomplexa: eimeriidae) from the inland bearded dragon, pogona vitticeps (sauria: agamidae).	fecal samples from 50 captive inland bearded dragons, pogona vitticeps (ahl, 1926), bred in california, were examined for coccidian parasites. sixteen (32%) of the lizards were found to be passing oocysts of isospora amphiboluri cannon, 1967, previously described from bearded dragons pogona barbata (cuvier, 1829) from australia. sporulated oocytes were spherical to subspherical, 25.3 x 25.1 (23-26 x 23-26) microns, with a shape index (length/width) of 1.0 (1.0-1.1). a micropyle, oocyst residuum, ...	1995	7707208
thermal ecology of the australian agamid pogona barbata.	this study compares the thermal ecology of male bearded dragon lizards (pogona barbata) from south-east queensland across two seasons: summer (1994-1995) and autumn (1995). seasonal patterns of body temperature (tb) were explored in terms of changes in the physical properties of the thermal environment and thermoregulatory effort. to quantify thermoregulatory effort, we compared behavioral and physiological variables recorded for observed lizards with those estimated for a thermoconforming lizar ...	1998	28307895
field test of a paradigm: hysteresis of heart rate in thermoregulation by a free-ranging lizard (pogona barbata).	the discovery that changes in heart rate and blood flow allow some reptiles to heat faster than they cool has become a central paradigm in our understanding of reptilian thermoregulation. however, this hysteresis in heart rate has been demonstrated only in simplistic laboratory heating and cooling trials, leaving its functional significance in free-ranging animals unproven. to test the validity of this paradigm, we measured heart rate and body temperature (tb) in undisturbed, free-ranging bearde ...	1999	10418165
lack of consistent hormonal responses to capture during the breeding season of the bearded dragon, pogona barbata.	the bearded dragon (pogona barbata: agamidae) is a diurnal, oviparous, multi-clutching lizard from australia. we examined plasma hormonal responses to capture in males and females during the spring breeding season. corticosterone concentrations at capture (0 h; < or =3 min after capture) were low (males: 1.81+/-0.63 ng/ml; females 2. 23+/-0.47 ng/ml) and within sexes were unrelated to the time of the day, snout-vent length or, in females, reproductive condition (vitellogenic, gravid, assumed spe ...	2000	10936767
seasonal patterns of plasma steroid hormones in males and females of the bearded dragon lizard, pogona barbata.	pogona barbata is an australian lizard that produces several large clutches of eggs between august and december (spring to early summer). mating takes place around ovulation. the seasonal pattern of reproductive hormones in males and females of p. barbata was determined by radioimmunoassay of plasma progesterone (p), estradiol-17beta (e-17beta), corticosterone (b), and total androgen (ta). in females, p began to rise in august and was elevated from september to december. corticosterone and ta we ...	2000	10764545
heat transfer in a microvascular network: the effect of heart rate on heating and cooling in reptiles (pogona barbata and varanus varius).	thermally-induced changes in heart rate and blood flow in reptiles are believed to be of selective advantage by allowing animal to exert some control over rates of heating and cooling. this notion has become one of the principal paradigms in reptilian thermal physiology. however, the functional significance of changes in heart rate is unclear, because the effect of heart rate and blood flow on total animal heat transfer is not known. i used heat transfer theory to determine the importance of hea ...	2000	10704295
control of heart rate during thermoregulation in the heliothermic lizard pogona barbata: importance of cholinergic and adrenergic mechanisms.	during thermoregulation in the bearded dragon pogona barbata, heart rate when heating is significantly faster than when cooling at any given body temperature (heart rate hysteresis), resulting in faster rates of heating than cooling. however, the mechanisms that control heart rate during heating and cooling are unknown. the aim of this study was to test the hypothesis that changes in cholinergic and adrenergic tone on the heart are responsible for the heart rate hysteresis during heating and coo ...	2001	11815660
early evolution of the venom system in lizards and snakes.	among extant reptiles only two lineages are known to have evolved venom delivery systems, the advanced snakes and helodermatid lizards (gila monster and beaded lizard). evolution of the venom system is thought to underlie the impressive radiation of the advanced snakes (2,500 of 3,000 snake species). in contrast, the lizard venom system is thought to be restricted to just two species and to have evolved independently from the snake venom system. here we report the presence of venom toxins in two ...	2006	16292255
temperature and the respiratory properties of whole blood in two reptiles, pogona barbata and emydura signata.	we investigated the capacity of two reptiles, an agamid lizard pogona barbata and a chelid turtle emydura signata, to compensate for the effects of temperature by making changes in their whole blood respiratory properties. this was accomplished by measuring the p50 (at 10, 20 and 30 degrees c), hematocrit (hct), haemoglobin concentration ([hb]) and mean cell haemoglobin concentration (mchc) in field acclimatised and laboratory acclimated individuals. the acute effect of temperature on p50 in p. ...	2006	16406640
a contractile cochlear frame is a common feature of the hearing organs in gekkota (sauria, squamata): a comparative study.	geckos are the most vocalizing animals among squamata. previously we discovered a contractile segment (the nal, noncartilaginous abneural limbus), within the rigid periotic cochlear frame of the gecko teratoscincus scincus [ganeshina and vorobyev, 2003]. because this unusual cochlear specialization has not previously been described in the vertebrate hearing organs, we have hypothesized that the nal has evolved within gekkota as a specialization associated with vocalization and sound communicatio ...	2009	19690407
allometric variation among juvenile, adult male and female eastern bearded dragons pogona barbata (cuvier, 1829), with comments on the behavioural implications.	the functional significance of allometric change in reptiles has received limited attention and the reason for such changes has been regarded as 'obscure'. in this paper we report data on the australian pogona barbata, the eastern bearded dragon, from across their range and review changes in allometric growth among juveniles, and adult males and females and consider the functional relevance of these changes. there were significant differences in the population for mass, tail length, tail width, ...	2011	21236651
deep fungal dermatitis caused by the chrysosporium anamorph of nannizziopsis vriesii in captive coastal bearded dragons (pogona barbata).	deep fungal dermatitis caused by the chrysosporium anamorph of nannizziopsis vriesii (canv) was diagnosed in a group of coastal bearded dragons (pogona barbata). the outbreak extended over a 6-month period, with four of six lizards from the same zoological outdoor enclosure succumbing to infection. a fifth case of dermatomycosis was identified in a pet lizard originally sourced from the wild. diagnosis of infection with the canv was based on similar clinical signs and histopathology in all anima ...	2011	22103953
dermatomycosis caused by paranannizziopsis australasiensis in five tuatara (sphenodon punctatus) and a coastal bearded dragon (pogona barbata) in a zoological collection in new zealand.	health monitoring of tuatara (sphenodon punctatus) at auckland zoo between 2001 and 2009 showed that 58/93 tuatara had been affected by dermatitis of unknown origin. from 2011 onwards, cases of suspected fungal dermatitis underwent extensive diagnostic investigations.	2016	27074995
distribution and amplification of interstitial telomeric sequences (itss) in australian dragon lizards support frequent chromosome fusions in iguania.	telomeric sequences are generally located at the ends of chromosomes; however, they can also be found in non-terminal chromosomal regions when they are known as interstitial telomeric sequences (itss). distribution of itss across closely related and divergent species elucidates karyotype evolution and speciation as itss provide evolutionary evidence for chromosome fusion. in this study, we performed physical mapping of telomeric repeats by fluorescence in situ hybridisation (fish) in seven austr ...	2019	30794668