Symptoms of thickening skin shedding from lethargic frogs and toads include difficulty breathing and eating, as their immune system is compromised by a deadly fungal disease known as chytridiomycosis, which has been referred to as an “epidermal epidemic” causing the extinction of numerous amphibian species globally.
Although not yet detected in Manitoba, this disease is believed to be widespread in the region. Jackie Tran, a graduate student conducting frog and salamander sampling in southern Manitoba, expressed the omnipresence of the pathogen on the continent, indicating a high likelihood of its presence in the province.
Chytridiomycosis in frogs is caused by the fungal pathogen Batrachochytrium dendrobatidis, while in salamanders, it is caused by Batrachochytrium salamandrivorans, which emerged in East Asia and has devastated local salamander populations in parts of Europe.
The disease has not yet crossed over to North America, according to current scientific knowledge.
The origins of the fungus affecting frogs and toads remain unclear, but it was likely present in Brazil and Asia for over a century before spreading globally, partly due to the exotic pet trade.
Chytridiomycosis has directly led to the extinction of at least 90 species and a decline in populations of over 500 others, making it the worst infectious disease recorded among vertebrates, with increasing prevalence in the U.S. and Canada.
Recent studies indicate a significant presence of chytrid in Alberta frog populations and amphibians in British Columbia, with northern leopard frogs being particularly impacted, leading to their endangered status in Western Canada and special concern in Manitoba.
Historical declines in leopard frog populations across Canada suggest a potential link to chytrid, which might have caused a drastic decrease in numbers in Manitoba decades ago.
Although not confirmed, suspicions point to chytrid as a possible cause of the observed decline in Manitoba’s leopard frog population in the past.
Ongoing research aims to identify the presence of the deadly fungal pathogen in Manitoba’s amphibian populations to facilitate proactive monitoring and conservation efforts.
The potential increase in risk to Prairie amphibians underscores the importance of monitoring and addressing the spread of pathogens in wetland habitats, particularly in light of changing environmental conditions.
Geographic modeling data are being utilized to pinpoint wetland habitats conducive to pathogen proliferation, providing valuable insights for conservation efforts beyond the immediate research focus.
Research at Brandon University aims to establish a proactive monitoring program to mitigate declines in amphibian populations and potentially prevent local extinctions.
Efforts to inoculate young leopard frogs against chytrid have shown promising results, offering hope for improved survival rates and successful reintroduction programs.
The research underscores the interconnectedness of wetland health with broader ecosystem well-being, emphasizing the importance of protecting these habitats for the benefit of various species and human health.
By identifying and addressing the presence of chytrid in Manitoba’s amphibians, researchers aim to prevent further declines and potentially save vulnerable species from extinction.
