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IMAGE: Sean Giery, Penn State The research team found that salamander population sizes and pond chemistry remained stable over the last three decades. When averaged across the region, the overall frequency of each egg color morph also remained the same about 70% white egg masses in both 1990 and 2020 but in many cases the frequency within individual ponds changed drastically. “At the scale of individual ponds, it’s an extremely dynamic system,” said Giery. “They don’t just reach one frequency and stay there. By focusing on individual ponds rather than just the region as a whole, we could tease apart what is driving these changes in population frequencies. In this case, we found two opposing evolutionary processes selection and drift.”

United statesSean gieryMarketa zimovaMark urbanDana drakeEberly postdoctoral research fellow at pennNational science foundationPenn state eberly college of scienceUniversity of connecticutUniversity of michiganPenn stateEberly postdoctoral research fellowPenn state professorBiology bill dunsonMichigan instituteGlobal change biology