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Amphibian Love Song

May 26, 2014 at 9:09 am
By Anna Persmark

Cope's Gray Tree Frog 

If you open a window or step outside and listen carefully, pausing for a

moment to filter out shouts, laughter, music, and cars, you’ll hear a different

Carleton soundtrack. The past few weeks the chorus has been growing; voices

swelling and filling the evening air near ponds, drainage ditches, rivers, and creeks.

Spring has sprung, and the amphibian world is making its presence known. Chirps,

squeaks, trills, and rumbles fill the night, deceptively loud for the diminutive size of

the frogs and toads making them. The Arboretum is home to eight species of frogs

and toads, several of which are already calling.

The Arboretum office keeps track of amphibians, conducting a three-part

frog and toad survey every spring. The survey not only tracks when and where

different species are breeding, but also represents a general picture of Arboretum

health. Amphibians are ecological indicators, that is, the health of frog and toad

population is generally indicative of the overall health of the environment.

Amphibians have porous skin, which allows oxygen and water to pass through to

maintain homeostasis and respiration. This unique aspect also means that

amphibians are especially susceptible to any toxins and stresses in their

environments, such as chemicals from agricultural run-off. A decline in the frog and

toad population is a symptom of a greater problem in the environment, and a sign

that we could be doing a better job of mitigating threats to the land.

The frogs and toads around Carleton, for me, are a comforting backdrop to

my routine, reminding me of the natural processes in the ever-changing cycle that

I’m also a part of. I grew up catching frogs and toads, spending afternoons poking

around creeks, and the familiarity of the amphibian life is reassuring. The next time

you hear a frog, think of it as a sign that the ecosystem around you, that you also

reside in, is continuing to thrive.

- Anna Persmark ’15, for the Cole Student Naturalists

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