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The results of the first national mammal survey, which involved researchers from across the country including a biologist at Penn State, provides the framework to answer a variety of questions about wild animal populations and conservation strategies for threatened species.
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.”
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