Male Pacific Tree Frog singing his Song of Spring.The frogs we hear singing their hearts out every evening are our tiny
Pacific Tree Frog, Pseudacris regilla, a common species throughout the
Northwest. They range from Northern California, all through Oregon and
Washington, British Columbia, and eastward to Idaho, Montana and
Nevada. These little guys come in shades of greens or browns, and can
be found from sea level up to over 11,000 feet, as well as our dry,
cold High Desert.
Male tree frogs begin the mating business in
early spring (and there are many of us who have heard them practicing
in our basements on warm winter nights); they migrate to ponds, where
they all start singing at once, and very loudly. The guy with the
loudest voice gets to mate first with the females laying their eggs on
and under vegetation and leaf litter in shallow, calm, clean water. And
they are a hardy bunch; they have to be to survive "spring" in Central
Oregon.
If the eggs are not eaten by salamanders or snakes,
embryos will become tadpoles within one to three weeks. If the tadpoles
are not eaten by salamanders, snakes and herons, the tadpoles will feed
on periphyton, filamentous algae, diatoms and pollen in and on the
surface of the water. If they are not eaten by bigger salamanders,
snakes, fish, bullfrogs, kingfishers or herons, about two and a half
months later, the tadpole’s metamorphosis is complete and they leave
the water as frogs and become terrestrial predators on arthropods.
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