Sacramento Fish & Wildlife OfficeServing the people, conserving the fish, wildlife, and plants of California
Site Visit Insights from Rick Kuyper
October 2, 2017
Site visits are critical to helping Sacramento Fish and Wildlife Office (SFWO) biologists learn more about species and their habitats. The trips often take them into areas most people do not have a chance to explore, including public and privately-owned restricted sites, as well as some remote and hard-to-reach areas. “Site visit Insights” provides a behind-the-scenes perspective of wildlife biology, featuring photographs and interesting discoveries and happenings SFWO biologists experience in the field.
Wildlife Biologist: Rick Kuyper, chief, Sierra Cascades Division
Site visit location: Toiyabe National Forest
What was the purpose of the site visit?
SFWO Biologist Becky Kirby and I were invited by the Reno Fish and Wildlife Office to meet with U.S. Forest Service Biologist Rachel Van Horne to participate in Yosemite toad (Anaxyrus canorus) monitoring activities on the Toiyabe National Forest.
Yosemite toads are difficult to find during most of the year because they prefer to remain hidden. They spend a lot of time underground in burrows for example. In the spring, the snow begins to melt, which creates ponds that the toads use for breeding and laying eggs. This usually lasts for only a week. We were able to see breeding toads, egg masses, and one-year-old juveniles in several different ponds. During our site visit, Becky and I helped collect male toads for a pit-tag study. A small “chip” is placed under the skin of the toads, giving each toad a unique identification number. When the toads are caught they are scanned to see if they already have a chip. And if they do, we are able to determine if toads have moved from one area to another, the age of toads, and we can estimate population sizes. All of this information allows us to understand how well toad populations are doing and the Forest Service can use this information to help inform land management decisions.
Where did you go?
We were on the Toiyabe National Forest, on the east side of the Sierra Nevada, in the Sonora Pass area. As we drove to the site, we could see the northern edge of Yosemite National Park. The elevation was around 9,000 feet.
What partners were you working with and what is the nature of SFWO’s partnership with them?
We worked with biologists from the Reno Fish and Wildlife Office and the U.S. Forest Service. The Reno office works closely with the Toiyabe National Forest because this forest is within its jurisdiction; but SFWO is the “species lead” for Yosemite toad, so the Reno FWO biologists invited us out to see the toads. We work closely with our colleagues in Reno and the Forest Service throughout the Sierras on many species, including Yosemite toads and Sierra Nevada yellow-legged frogs.
What did you learn from this site visit that you didn’t know before?
This was the first time Becky and I were able to observe Yosemite toads. With our job, it is essential to see the species up close in their habitat. Just observing the toads and seeing how they spend the day was extremely informative. We watched breeding behaviors, we could see where the females preferred to lay their eggs, we observed males sitting in burrow openings, and countless one-year-old juveniles hopping all over the place along the outer edges of the ponds. We had to walk with great care to make sure we weren’t stepping on any of the little juveniles.
What surprises did you encounter during the site visit?
Going in I knew that toads are well camouflaged and difficult to see, but I was still surprised at how hard it was to see them unless they moved. If they hold perfectly still you’ll walk right past them. At first it was hard to find them, but then your eyes get a search image and you start seeing toads more easily. The eggs were especially difficult to see. We marked the egg masses with red flags so we wouldn’t accidentally step on them. When the males are calling for females, it gets loud but as you approach the pond they stop calling and everything becomes perfectly quiet for a few moments and then they start up again.
Because Yosemite toads breed in remote meadows in the Sierra Nevada Mountains, it’s difficult to time your visit just right. They’re only congregating together for a few short days during the year, and then they head away from the wet meadows into the forests and they are rarely seen until the next snowmelt. Being there during this small window is an unforgettable experience.
There was still a lot of snow on the ground. The toads manage to survive during the winter hunkered down in burrows and they had to wait a little extra long this year for the snow to melt.
We were also treated to afternoon thundershowers and a hail storm.
Click here to learn more about the Yosemite toad.
Male Yosemite toads set up a territory in shallow water and make a trilled breeding call to attract a female. Video credit: Jill-Marie Seymour
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Last updated: October 22, 2019