Which environmental threats have caused amphibian populations to decline?

Amphibian populations are facing significant declines due to a combination of human-driven environmental threats and disease. Because amphibians often have narrow habitat requirements and permeable skin, they are particularly vulnerable to these stressors.12

Key environmental threats include:

• Habitat Loss and Fragmentation: The conversion of land for agriculture, logging, and infrastructure development is a primary driver of decline. This process destroys essential environments and fragments remaining areas, which isolates populations and hinders gene flow.1
• Disease: The parasitic fungus Batrachochytrium dendrobatidis (Bd), which causes amphibian chytridiomycosis, is a major global threat. It has been linked to the extinction or severe decline of hundreds of species by disrupting skin function, leading to cardiac arrest.34
• Chemical Pollution: Amphibians are highly susceptible to endocrine-disrupting chemicals. For example, the herbicide atrazine can impair gonadal development and promote the development of intersex individuals in frogs.2
• Climate Change and Atmospheric Shifts: Factors such as global warming, acid rain, and ozone depletion are recognized as contributing to population reductions, though their specific impacts can vary by region.31