A field trip with Rick
Roth
As a kid I collected things with my critter buddies, snakes,
dragonflies, whatever we could find that hopped, crawled or flew. We waded into
vernal ponds with our peanut butter jars before anybody knew they had a name.
About twenty-five years ago I began going out again and wound up starting the
Cape Ann Vernal Pond Team. Massachusetts was the first state in the country to
give them protection. Now, when we take people out there, the spectacle is so
interesting that they ask, "How can I help?"
Rick Roth with helper |
There's going to be good frog action tonight, I can
guarantee it. We're not going to disappoint all these families that brought
their kids out on a rainy night. Hear that croak, the quacking sound? Wood
frog. Yeah, there it is. It's one of the indicator species of a vernal pond,
meaning it's dependent for breeding on ponds that dry up in the summer. It's a
race against time for the tadpoles to develop legs and lungs so they can hop
out as miniature frogs before the ponds go dry.
Wood frog |
"Hey, Rick. Over here! We found one! A salamander. Dad!
Mom! Look at this. It's moving."
Okay, cool. Check this out, everybody. Thanks for the
heads-up, you guys.
Yellow-spotted
salamander
|
Our friends here only come out on rainy nights in early
spring. They're in the mole salamander group, because they spend most of their
lives underground where it's damp. See that crevice? I've seen them lined up in
there waiting for it to rain. They won't cross twenty feet of ground to the
pond unless it rains.
Hibernaculum |
There's one now. It probably just came out. Salamanders can
congregate in cold weather in these deep crevices and under stumps, where the frost
can't reach them. It's called a hibernaculum. Wood frogs don't usually go down that
deep in the winter. They're one of the only known land vertebrates that can
actually freeze solid and survive ice crystals in their cells.
Salamander leaving hibernaculum
|
There goes the salamander, headed for the pond. Wetlands are
the hotspot for forest activity. I always look for water if I'm looking
for critters.
Swimming salamanders
|
The males show up first and deposit their part of the
bargain on twigs and leaf litter in the water, in those little popcorn-like
clusters you see called spermatophores. The salamanders can stay submerged
indefinitely because they can take in enough oxygen from the water through
their skin evidently by osmosis.
Salamander eggs
|
When the females arrive they find the spermatophores
to fertilize their eggs, which they attach underwater to twigs. That's the
little dots you see in the middle of the jelly. The larvae have gills on the
side of their heads. Unlike tadpoles they're born with legs. They grow to about
half an inch before they hatch from the
egg cluster. They're about 2" long by the time they're ready to crawl out
of the pond into the woods.
Rain drops and cliff
drops
|
"Hey Rick, up here. Should we pick this guy up before
it falls over the cliff?" No, it'll be okay. I've seen salamanders go right over the edge of the quarry and swim
away. It doesn't seem to bother them. They know what they're doing.
I don't think my interests are eccentric at all. This is
ultimately about the health of the planet, saving open space so that the trees
can make more oxygen. The forest is not just trees, it's a symbiotic
relationship with all these animals. To me, it just makes perfect sense that
not only are these wonderful things that we have called Nature, that includes
all these delightful plants and animals, but it's also necessary.
Our certification program aims to register and protect all
the vernal pond habitats on Cape Ann. We welcome newcomers to this fun and
important activity. Take a look at our website, http://capeannvernalpond.org/.