June 2000 PRBO Riparian Songbird Study Post-fire Observations Along Lee Vining Creek
E-mail message dated June 3, 2000
I just completed one of our point count transects in Lee Vining Canyon, and thought you might be interested in some post-fire observations. For those of you that don't have the background, the southern moraine of Lee Vining Canyon and some of the southern creek edge caught fire last monday May 29. The fire started across the creek from Asuza campground, by an illegal campfire.... or so the last story I've heard goes.
Six of our point count stations were burned. With the use of a GPS and written descriptions, I had no trouble finding the points. The 50m radius circle around each of these points ranged from 40% to 50% burned... in every case, the northern side of Lee Vining Creek is intact and the southern side of the creek is charred down to the sandy soil. So, the 60%-50% unburned portion of the point count circle reflects the north side of the creek, and the few remaining trees in the burned portion. A few green lodgepole or Jeffrey pines remain within the burned portion at each point and some 1/2 burned willow, but for the most part the burned landscape consists of white and black ashy ground spotted with blackened and burned lodgepole, Jeffrey and aspen snags and close-to the ground blackened and burned willow stumps.
Most of the bird species detected at this site (all points, not just burned ones) during the past two seasons were species whose nests are generally found in the mid to upper canopies of Jeffrey and lodgepole pines and aspens: species such as Western Wood Pewee, Western Tanager, Audubon's Warblers, Cassin's Finch, Warbling Vireo, Brown Creeper, American Robin and Steller's Jays. Cavity nesters : Hairy Woodpecker, Red-breasted Sapsucker, House Wren, Tree and Violet Green Swallows, and Mountain Chickadee. Five species of sometimes low canopy, but predominantly shrub-nesting birds such as Black-headed Grosbeaks, Brewer's Blackbird, Song Sparrows, Green-tailed Towhees and Yellow Warblers were were also encountered as breeders in previous years. Two species of ground nesters, Oregon Junco and Spotted Towhee bred at this site 1998 and 1999.
During today's count, I detected all of the above species. I observed a pair of Oregon Juncos and Western Wood Pewees perching and flitting about the charred branches of the lodgepoles, acting territorial, but unseasonably not "nesty". A Cassin's Finch was carrying nesting material. Tree Swallow eggs were observed near this site 2 weeks ago, so I'm guessing some nests were lost during egg stage.
I look forward to monitoring this site in the future, and wonder if we will detect any changes in species composition or abundance in this post-fire recovering landscape.
All my best,
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