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Frog population explodes in region of Vermont

Lisa Rathke
Associated Press

Salisbury, Vt. – A wet spring has caused one frog population to explode in an area of Vermont where throngs of the amphibians have been hopping through fields and lawns, darting across roads and getting flattened by cars and tractors.

University of Vermont herpetology lecturer James Andrews estimates that the population of the northern leopard frog has leaped a hundredfold in a region near the Otter Creek in Addison County.

In this July 23, 2019 photo, Jim Andrews, a University of Vermont herpetology lecturer, holds a young northern leopard frog in Salisbury, Vt. A wet spring has resulted in a 100-fold increase in the population of the particular frog in a region of Vermont.

“People who have been here you know 30 years or more say they have never seen this many frogs,” said Andrews, who is also coordinator of The Vermont Reptile and Amphibian Atlas and lives in the town of Salisbury, where a mass of frogs has emerged. “And it’s a result, I think, of not only the perfect storm of conditions this year but also as a result of climate change, the amount of extra moisture that we’re getting in this area in general.”

Rainfall – or a lack of it – can have big impacts on amphibian populations, said John Kanter, a senior wildlife biologist at the National Wildlife Federation. The region of Salisbury and some surrounding towns near the Otter Creek had a wet spring, and some fields held water into July.

This July 23, 2019, photo shows two dead frogs on a road in Salisbury, Vt. A wet spring has resulted in a 100-fold increase in the population of the northern leopard frog in a region of Vermont this summer.

The northern leopard frog lays its eggs in the grassy flood plains of the creek; normally many of those eggs would have dehydrated as fields dried out, but that didn’t happen this year. Then a warm spell sped up the development of the young tadpoles, which transformed into frogs just as the fields were drying out, according to Andrews.

“We had this wave of hundreds of thousands of frogs that successfully metamorphosed,” Andrews said. “And over the last week, week and a half, they have moved out a mile, mile and a half maybe, two miles in that direction. You can see the dead frog remains on the road.”

Andrews and others counted 400,000 dead frogs on a half-mile stretch of road.

The dried-up carnage is still visible and odorous along the road while dark specks in the pavement show where many other frogs were crushed.

“They’re just all over the fields,” said LeeAnn Goodrich, of her family’s farm. “Even my husband who’s been here since he was a child has said the same thing – that he’s never seen this many frogs.”