| nitrogen metabolism during development in the corroboree frog, pseudophryne corroboree moore. | | 1971 | 5542622 |
| assessment of genetic diversity in the critically endangered australian corroboree frogs, pseudophryne corroboree and pseudophryne pengilleyi, identifies four evolutionarily significant units for conservation. | the iconic and brightly coloured australian northern corroboree frog, pseudophryne pengilleyi, and the southern corroboree frog, pseudophryne corroboree are critically endangered and may be extinct in the wild within 3 years. we have assembled samples that cover the current range of both species and applied hypervariable microsatellite markers and mitochondrial dna sequences to assess the levels and patterns of genetic variation. the four loci used in the study were highly variable, the total nu ... | 2008 | 19160475 |
| mortality in northern corroboree frog tadpoles (pseudophryne pengilleyi) associated with tetrahymena-like infection. | mortality of northern corroboree frog tadpoles and eggs occurred in association with tetrahymena-like ciliates. the predominant lesions in the tadpoles were inflammation and necrosis of the dermis and skeletal muscle. some of the egg capsules also contained ciliates, but were overgrown with bacteria and fungi. | 2015 | 26220324 |
| the influence of carotenoid supplementation at different life-stages on the foraging performance of the southern corroboree frog (pseudophryne corroboree): a test of the silver spoon and environmental matching hypotheses. | organismal performance can be significantly affected by the nutritional conditions experienced during different life-stages. the silver spoon hypothesis predicts that individuals will always perform better as adults when they experience advantageous conditions during development. in contrast, the environmental matching hypothesis predicts that individuals will perform better if they experience similar conditions during development and adulthood. past tests of these hypotheses have focussed on th ... | 2016 | 26849910 |
| epidermal cell death in frogs with chytridiomycosis. | amphibians are declining at an alarming rate, and one of the major causes of decline is the infectious disease chytridiomycosis. parasitic fungal sporangia occur within epidermal cells causing epidermal disruption, but these changes have not been well characterised. apoptosis (planned cell death) can be a damaging response to the host but may alternatively be a mechanism of pathogen removal for some intracellular infections. | 2017 | 28168107 |
| testing the effect of dietary carotenoids on larval survival, growth and development in the critically endangered southern corroboree frog. | the success of captive breeding programs (cbps) for threatened species is often limited due to a lack of knowledge of the nutritional conditions required for optimal growth and survival. carotenoids are powerful antioxidants known to accelerate vertebrate growth and reduce mortality. however, the effect of carotenoids on amphibian life-history traits remains poorly understood. the aim of our study was to use a manipulative laboratory experiment to test the effect of dietary-carotenoid supplement ... | 2017 | 28198035 |
| the effect of dietary antioxidants and exercise training on the escape performance of southern corroboree frogs. | escape-response behaviour is essential to ensure an individual's survival during a predator attack, however, these behaviours are energetically costly and may cause oxidative stress. oxidative stress can be reduced by supplementing an individual's diet with exogenous antioxidants or through regular moderate exercise training, which stimulates the upregulation of the endogenous antioxidant system. two studies have tested the simultaneous effects of dietary antioxidant supplementation and exercise ... | 2017 | 28859898 |
| hormone-induced spawning of the critically endangered northern corroboree frog pseudophryne pengilleyi. | fundamental knowledge of the optimal hormone concentrations required to stimulate amplexus and spawning in breeding pairs of amphibians is currently lacking, hindering our understanding of the proximate mechanisms underpinning mating behaviour. the present study investigated the effects of: (1) the dose of a gonadotropin-releasing hormone analogue (gnrh-a) administered; (2) male-female hormone administration interval; and (3) topical application of gnrh-a, on spawning success in the northern cor ... | 2018 | 29694827 |
| effect of carotenoid class and dose on the larval growth and development of the critically endangered southern corroboree frog. | dietary carotenoids are expected to improve vertebrate growth and development, though evidence for beneficial effects remains limited. one reason for this might be that few studies have directly compared the effects of carotenoids from different classes (carotenes versus xanthophylls) at more than one dose. here, we tested the effect of two doses of dietary β-carotene and lutein (representing two different carotenoid classes) on the growth and development of larval southern corroboree frogs (pse ... | 2019 | 30906558 |
| the burramys project: a conservationist's reach should exceed history's grasp, or what is the fossil record for? | the fossil record provides important information about changes in species diversity, distribution, habitat and abundance through time. as we understand more about these changes, it becomes possible to envisage a wider range of options for translocations in a world where sustainability of habitats is under increasing threat. the critically endangered alpine/subalpine mountain pygmy-possum, burramys parvus (marsupialia, burramyidae), is threatened by global heating. using conventional strategies, ... | 2019 | 31679491 |
| treatment trial of clinically ill corroboree frogs with chytridiomycosis with two triazole antifungals and electrolyte therapy. | chytridiomycosis caused by the pathogen batrachochytrium dendrobatidis is an important cause of amphibian declines globally, and is the worst pathogen on record for causing biodiversity loss. the critically endangered southern corroboree frog, pseudophryne corroboree, is functionally extinct in the wild and is surviving in captive assurance colonies. these captive colonies must remain disease free, and there is no known treatment for corroboree frogs with terminal chytridiomycosis. in this study ... | 2015 | 26246159 |
| amphibians with infectious disease increase their reproductive effort: evidence for the terminal investment hypothesis. | mounting an immune response to fight disease is costly for an organism and can reduce investment in another life-history trait, such as reproduction. the terminal investment hypothesis predicts that an organism will increase reproductive effort when threatened by disease. the reproductive fitness of amphibians infected with the deadly fungal pathogen batrachochytrium dendrobatidis (bd) is largely unknown. in this study, we explored gametogenesis in two endangered and susceptible frog species, ps ... | 2016 | 27358291 |
| reservoir-host amplification of disease impact in an endangered amphibian. | emerging wildlife pathogens are an increasing threat to biodiversity. one of the most serious wildlife diseases is chytridiomycosis, caused by the fungal pathogen, batrachochytrium dendrobatidis (bd), which has been documented in over 500 amphibian species. amphibians vary greatly in their susceptibility to bd; some species tolerate infection, whereas others experience rapid mortality. reservoir hosts-species that carry infection while maintaining high abundance but are rarely killed by disease- ... | 2016 | 27594575 |
| dietary carotenoid supplementation enhances the cutaneous bacterial communities of the critically endangered southern corroboree frog (pseudophryne corroboree). | the rapid spread of infectious disease has resulted in the decline of animal populations globally. amphibians support a diversity of microbial symbionts on their skin surface that help to inhibit pathogen colonisation and reduce disease susceptibility and virulence. these cutaneous microbial communities represent an important component of amphibian immune defence, however, very little is known about the environmental factors that influence the cutaneous microbiome. here, we characterise the cuta ... | 2017 | 27623966 |
| characterization of mhc class ia in the endangered southern corroboree frog. | southern corroboree frogs (pseudophryne corroboree) have declined to near extinction in the wild after the emergence of the amphibian chytrid fungus batrachochytrium dendrobatidis in southeastern australia in the 1980s. a major captive breeding and reintroduction program is underway to preserve this iconic species, but improving resistance to b. dendrobatidis would help the wild population to be self-sustaining. using 3' and 5' rapid amplification of complementary dna ends (race), we characteriz ... | 2017 | 28028562 |
| presence of the amphibian chytrid fungus batrachochytrium dendrobatidis in threatened corroboree frog populations in the australian alps. | since the early 1980s, the southern corroboree frog pseudophryne corroboree and northern corroboree frog p. pengilleyi have been in a state of decline from their sub-alpine and high montane bog environments on the southern tablelands of new south wales, australia. to date, there has been no adequate explanation as to what is causing the decline of these species. we investigated the possibility that a pathogen associated with other recent frog declines in australia, the amphibian chytrid fungus b ... | 2010 | 21268983 |
| hormonal induction of gamete release, and in-vitro fertilisation, in the critically endangered southern corroboree frog, pseudophryne corroboree. | conservation breeding programs (cbp's) are playing an important role in the protection of critically endangered anuran amphibians, but for many species recruitment is not successful enough to maintain captive populations, or provide individuals for release. in response, there has been an increasing focus on the use of assisted reproductive technologies (art), including the administration of reproductive hormones to induce gamete release followed by in vitro fertilisation. the objective of this s ... | 2010 | 21114857 |
| alkaloids from australian frogs (myobatrachidae): pseudophrynamines and pumiliotoxins. | australian frogs of the genus pseudophryne contain two distinct classes of alkaloids. the pseudophrynamine class (3a-prenyl pyrrolo[2,3-b]indoles) are unique to this genus of frogs of the family myobatrachidae, while the pumiliotoxin-a class (8-hydroxy-8-methyl-6-alkylidene-1-azabicyclo[4.3.0]nonanes) also occur in dendrobatid frogs of the genera dendrobates, epipedobates, and minyobates, in ranid frogs of the genus mantella, and in bufonid toads of the genus melanophryniscus. all seven species ... | 1990 | 2380714 |