If you love amphibians and missed the breeding season on the west side of the state, take a trek over the Cascades and you’ll find more breeding! With higher elevation and different rain patterns, the amphibians on the east side breed much later (in actual Spring!) than their west side counter parts that already did their thing last February.
The Oregon spotted frog (Rana pretiosa) is a mostly aquatic species that used to occupy the Willamette Valley and the Cascades. In 1993, USFWS designated it a threatened species, but did not list it due to other higher priority species needs taking precedence (down side of being a wildlife biologist: prioritizing species’ lives). Last August, USFWS proposed to list the Oregon spotted frog as threatened. So, USFWS is gathering more data about them, and invited OPRD to survey a known breeding site along the Deschutes River at La Pine State Park. USFWS wants us to go look for awesome amphibians to help the species? Absolutely!
So last week I drove over to Bend and met up with Greg Cianella, our Natural Resource Specialist for the Eastern Region. He had arranged everything – kayaks, data sheets, GPS and maps – so all I had to do was get in the boat and start paddling.
In contrast to our other breeding frogs, Oregon spotted frogs breed in very shallow water – preferring it less than a foot deep. They like it still, shallow, and what a lot of us people consider “icky”. Breeding areas are often devoid of emergent vegetation where the sun can warm the water – and the eggs – quickly. The breeding season is very short, only about four weeks long. That means when it’s time to survey you get out there and do it!
They lay their eggs as large masses that float on the surface when fresh. The masses are about the size of an orange, and as they mature the mass gets more “fluffy” and swells in size.
While we were trying to get a nice shot, maneuvering kayaks around, Greg noticed something different laying on the bottom of the slough. We did some more maneuvering – the wind was determined to move us where we didn’t want to go – and managed to get a good look at the stuff. Long strings! Everywhere. Like really long shoe laces crisscrossing the muddy substrate. Yet MORE maneuvering, and I managed to carefully lift the mystery shoelaces up to see them. The sediment dusted off and revealed a beautiful string of delicate eggs.
All told, we found 30 spotted frog egg masses, the toad eggs, quite a few bufflehead, a slough of mallards, and sunshine on the water.
It was a good day to be a wildlife biologist!