correlations of cranial morphology, ecology, and evolution in australian suctorial tadpoles of the genera litoria and nyctimystes (amphibia: anura: hylidae: pelodryadinae). | suctorial anuran larvae are highly specialized for living in fast-flowing waters, using their oral disks as adhesive organs to attach to the substrate. the cranial musculoskeletal structure of suctorial larvae of litoria nannotis, l. rheocola, and nyctimystes dayi (hylidae: pelodryadinae) were compared with congenerics with pond-type larvae (l. caerulea, l. genimaculata, l. xanthomera). data from two other neobatrachian species with suctorial larvae (boophis sp., hyla armata) as well as publishe ... | 1998 | 9796529 |
behaviour of australian rainforest stream frogs may affect the transmission of chytridiomycosis. | the amphibian disease chytridiomycosis, caused by the pathogen batrachochytrium dendrobatidis, has been implicated in mass mortalities, population declines and extinctions of amphibians around the world. in almost all cases, amphibian species that have disappeared or declined due to chytridiomycosis coexist with non-declining species. one reason why some species decline from chytridiomycosis and others do not may be interspecific differences in behaviour. host behaviour could either facilitate o ... | 2007 | 17933392 |
environmental refuge from disease-driven amphibian extinction. | species that are tolerant of broad environmental gradients may be less vulnerable to epizootic outbreaks of disease. chytridriomycosis, caused by the fungus batrachochytrium dendrobatidis, has been linked to extirpations and extinctions of amphibian species in many regions. the pathogen thrives in cool, moist environments, and high amphibian mortality rates have commonly occurred during chytridiomycosis outbreaks in amphibian populations in high-elevation tropical rainforests. in australia sever ... | 2011 | 21902719 |
Short-term exposure to warm microhabitats could explain amphibian persistence with Batrachochytrium dendrobatidis. | Environmental conditions can alter the outcomes of symbiotic interactions. Many amphibian species have declined due to chytridiomycosis, caused by the pathogenic fungus Batrachochytrium dendrobatidis (Bd), but many others persist despite high Bd infection prevalence. This indicates that Bd's virulence is lower, or it may even be a commensal, in some hosts. In the Australian Wet Tropics, chytridiomycosis extirpated Litoria nannotis from high-elevation rain forests in the early 1990 s. Although th ... | 2011 | 22028834 |
cool temperatures reduce antifungal activity of symbiotic bacteria of threatened amphibians--implications for disease management and patterns of decline. | chytridiomycosis, caused by the fungus batrachochytrium dendrobatidis (bd), is a widespread disease of amphibians responsible for population declines and extinctions. some bacteria from amphibians' skins produce antimicrobial substances active against bd. supplementing populations of these cutaneous antifungal bacteria might help manage chytridiomycosis in wild amphibians. however, the activity of protective bacteria may depend upon environmental conditions. biocontrol of bd in nature thus requi ... | 2014 | 24941262 |
host-specific thermal profiles affect fitness of a widespread pathogen. | host behavior can interact with environmental context to influence outcomes of pathogen exposure and the impact of disease on species and populations. determining whether the thermal behaviors of individual species influence susceptibility to disease can help enhance our ability to explain and predict how and when disease outbreaks are likely to occur. the widespread disease chytridiomycosis (caused by the fungal pathogen batrachochytrium dendrobatidis, bd) often has species-specific impacts on ... | 2014 | 25505533 |
infection dynamics, dispersal, and adaptation: understanding the lack of recovery in a remnant frog population following a disease outbreak. | emerging infectious diseases can cause dramatic declines in wildlife populations. sometimes, these declines are followed by recovery, but many populations do not recover. studying differential recovery patterns may yield important information for managing disease-afflicted populations and facilitating population recoveries. in the late 1980s, a chytridiomycosis outbreak caused multiple frog species in australia's wet tropics to decline. populations of some species (e.g., litoria nannotis) subseq ... | 2020 | 32483317 |
the return of the frogs: the importance of habitat refugia in maintaining diversity during a disease outbreak. | recent decades have seen the emergence and spread of numerous infectious diseases, often with severe negative consequences for wildlife populations. nevertheless, many populations survive the initial outbreaks, and even undergo recoveries. unfortunately, the long-term effects of these outbreaks on host population genetics are poorly understood; to increase this understanding, we examined the population genetics of two species of rainforest frogs (litoria nannotis and litoria serrata) that have l ... | 2019 | 31013393 |