Prevalence of the fungus Batrachochytrium dendrobatidis in amphibians distributed in montane mesophilic forest in southern Mexico
Keywords:
frogs, chytridiomycosis, PCR, altitudinal gradient, temperatureAbstract
The loss of biodiversity distribution areas by anthropogenic activities caused for the stress exert on ecosystems from the local to the global level. The presence of the fungus Batrachochytrium dendrobatidis was evaluate in twenty-six species of amphibians associated with mountain cloud forest. Chytridiomycosis infection from amphibian skin swabs was diagnose by PCR. The specimens of amphibian were sample at an altitudinal gradient (500 to 2000 meters above sea level) in rainy and dry seasons. According to Spearman's Rho analysis, a positive relationship was show for the occurrence of B. dendrobatidis in variables such as body temperature, substrate temperature and humidity, in combination with other variables such as the stage of development and type of environment known the B. dendrobatidis presence and development to be influence. Likewise, it was founded that amphibian species with free-living larval development have a greater probability of becoming infected compared to those with direct development in this way, amphibian individuals with visible clinical signs of chytridiomycosis were recorded. The results indicate that B. dendrobatidis presence and prevalence is related to the susceptibility or resistance of each of the species and its interaction with various ecological variables; in this way, the amphibian Exerodonta sumichrasti and Ptychohyla leonhardschultzei they were positive for B. dendrobatidis infection and, there are no previous records in these ecosystems.
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