Amphibians may develop immunity to fatal fungus
Amphibian populations are declining worldwide, principally because of the spread of the fungal disease chytridiomycosis. Researchers know that some amphibian populations and species are innately more susceptible to the disease than others. Recent preliminary evidence, described in the April issue of BioScience, suggests also that individual amphibians can sometimes develop resistance to chytridiomycosis, which is caused by the fungus Batrachochytrium dendrobatidis (Bd). Jonathan Q. Richmond, of the US Geological Survey, and three coauthors argue that researchers should broaden their studies of chytridiomycosis to include so-called acquired immunity, because this might improve predictive models of Bd's spread and so suggest ways to protect threatened frog and toad populations...