Why do salamanders migrate


Ohio's Salamander Migration Reminds Us Of Nature's Resilience

WOSU 89.7 NPR News | By Jeff St. Clair
PublishedMarch 23, 2021 at 8:50 AM EDT
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Isaac St. Clair
An amorous wood frog straddles a spotted salamander near a vernal pool in Summit County in an exuberant celebration of spring.

Life is returning to Ohio woodlands as winter gives way to warmer weather. Creatures that for months slumber underground are now seeking spots to breed in an ancient rite of renewal.

We head out into the woods in search of the elusive harbingers of spring.

Summit Metro Parksnaturalist Becca Zak offers a few tips for successfully spotting a migrating salamander.

It has to be dark," she said. "It cant be windy, and it has to be actively raining at about 50 degrees.

There's a feeling in the air when conditions are right.

Its my favorite time of year, Zak said.

A Brief Time Above Ground

My sons and I went out on a recent evening in early March that was close to perfect, except the rain had stopped. We trekked through a remote Summit County woods bordered by a busy interstate.

In the distance, a sweet chorus cut through the roar of the highway. Spring peepers,tiny frogsabout the size of a quarter, sang backup to the raucous quacking of amorous wood frogs, spring's earliest arrivals.

The frogs splashed in a muddy puddle turned woodland nursery in a passionate romp to celebrate the end of winter.

We spy one frog gripping a rather unwilling partner, a malespotted salamander. Zak sees these shy amphibians each spring inSand Run Metro Park.

Theyre about the size of a hotdog with a really nice, wide smile, which makes them super cute," she said.

Credit Isaac St. Clair / WKSU
Spotted salamanders spend most of the year underground only emerging for a brief flurry of mating early in spring.

Two rows of bright yellow spots line its blueish-black body, glowing in the dim light. Just a handful ofmale salamandersventured out the night we were out; the females apparently had the sense to await more rain.

These salamanders are only seen during their brief spring courtship, spending the remaining 11 months of the year underground feeding on worms and insects.

A Fungal Invasion

Our next stop was northern Portage County. Here we metHiram Collegebiology professor Jenn Clark and her students, who are counting amphibians caught in special traps near the schools field station.

Henry Schwendler, an environmental studies student at Hiram, scoops up a dark gray salamander.

We got a Jeffersons, he said.

(At least, he guessed it was aJefferson salamander. Identifying some species can get tricky, asthis videoexplains.)

Its part of a survey of several puddles, large ruts leftover from an old logging road, where they monitor the emergence of woodland amphibians.

Another Hiram student, Zack Fox, reads the total from one pool: 68 wood frogs, 52 Jefferson's, and one red-spotted newt."

Clark tested several animals for afungal infectionthat in other parts of the world has wiped out populations of rare frogs.

Were trying out a new method to swab amphibians for chytrid that may or may not work, she acknowledged.

Keegan Rankin, another of Clarks students, explained how the fungus grows on the frogs skin, causing them to suffocate.

And youll see in certain species that get infected, their skin becomes thick and leathery, and often turns red," said Rankin. "So if you see a lot of dead frogs in your area with red legs, its a sign of the presence of chytrid.

After the count, Rankin dumped the critters back in the pool.

Clark will send the swabs to a California lab to determine how widespread the fungus is in Hiram. In a previous survey in Geauga County she found it in every sample she collected.

The Ultimate Survivors

Theyve been around for millions of years and have lived through ice ages, heat waves, droughts and floods," says Greg Lipps, the amphibian and reptile conservation coordinator at Ohio State University, and coauthor ofThe Amphibians of Ohio.

He saidamphibianshave managed to live through all of these upheavals over the eons, but now their populations around the world are declining. "Thats very worrisome, Lipps says.

The fungus is a huge reason, "but by far the largest threat and the biggest driver in the loss of biodiversity, both in Ohio and throughout the world, is the loss of habitat.

Vernal pools and small wetlands have virtually no protection from development other than aggressive land conservation. Four ofOhio's 25 salamander speciesare endangered, including the massive and extremely rareHellbender, which reaches two feet long.

The Appalachian region of the U.S. hasmore types of salamanderthan anywhere else in the world, and 40% of them are threatened.

For tens of thousands of years, salamanders have been waking up in the spring and marching to breeding pools along Sand Run in Akron. In recent years, its been a big draw for people wanting to witness the annual migration.

Zak says this years public event is cancelled due to COVID-19, but they had a virtual presentation to answer the age-old question:

They cross the road because theyre going somewhere," Zak says. "They really do need to get to the other side.