Warm March Triggers Early Frog Calls, But Some Falter

The spring of 2024 brought an odd burst of heat in March, a “false spring, ” before the air turned icy again. Researchers used silent recorders to track how four frog and toad species began calling in the wild from 2022 to 2025. The species studied were the boreal chorus frog, spring peeper, wood frog, and American toad. When temperatures rose early, the first calls started 11 to 18 days earlier than they had in 2022. This shift shows that frogs are sensitive to even short‑term weather changes, not just long‑term warming. However, the overall chance that a frog would call during this period dropped in 2024 for all species except the spring peeper. The spring peeper actually called more often than in other years, while the boreal chorus frog fell from a 69% calling rate to just 49%.

A lower calling probability can hurt a species that is already in decline. If frogs do not call enough, they may attract fewer mates and produce fewer offspring, which can reduce population numbers over time. The study highlights that each species reacts differently to weather. Some may adapt quickly, while others struggle when conditions change abruptly. These mismatches between breeding timing and the availability of food or safe habitats can threaten the survival of young frogs. Understanding these patterns helps scientists predict how climate swings might influence amphibian populations in the future.

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