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Owens Valley |
Owens Valley Program
Kelly and Kayla run the Owens River program, and tag-teamed for this update!
In spring 2021, GBBO began a three-year monitoring effort on the Owens River on Southwestern Willow Flycatchers (SWFL), Yellow-billed Cuckoo, Least Bell’s Vireos, and other riparian obligate species. Despite drought conditions, partners from Southern Sierra Research station detected over 100 SWFL territories using call playback. SWFL nests were also monitored for success and parasitism – 11 nests were found on 10 territories. While at least 6 of these were parasitized by Brown-headed Cowbirds, they produceed at least 13 fledglings.
We were also joined by Murrelet Halterman, who conducted Yellow-billed Cuckoo surveys in the area. Two cuckoos were detected (one was an incidental), though neither was thought to be territorial. No Bell’s Vireo were recorded during point counts, but we recorded 92 species along 10 point count transects. We look forward to surveying again this spring!
Kayla added
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Nest with decoy egg |
GBBO continues to monitor the impacts of renewable energy facilities in on birds and bats by conducting ongoing standardized mortality surveys. In the Altamont Wind Energy Area of California, our teams are working on two sites to perform these surveys using highly trained dogs that locate mortalities by scent. At the Crescent Dunes Solar Facility near Tonopah, human survey teams perform the searches. These efforts are critical in understanding and minimizing any negative effects of renewable energy production on birds and bats.
- John
Species Range Shifts
I think everyone is going to talk about how hot and dry 2021 was. Every year there are seasonal differences, but the ones I saw this year were some of the starkest I’ve ever observed. Rather than gloom and doom the place up, how about a less direct discussion of these changes!
In early 2021, many birders are aware, that the northernmost nesting attempt of LeConte’s Thrasher was documented, rather thoroughly by a few researchers. This nesting effort was ultimately unsuccessful, but suggests several important things. The species has not necessarily been extensively studied, but those who have spent considerable time with them all note that they are not exceptional flyers, and do not disperse particularly far. This nesting site was some 200 miles north of the closest previously known nesting location. For a bird that is not described as a particularly strong flyer, that is a pretty impressive distance for not 1, but 2, birds of opposite sexes to travel and find each other. To me that really emphasizes the title of Jay Sheppard’s recent book, The Biology of a Desert Apparition: LeConte’s Thrasher. It seems likely that these guys are making smaller leaps, finding suitable habitat along the way, and making their way north. If only birding the salt desert were more exciting, we could get some more eyes out there…
A semi-related bird record is the appearance of Nevada’s second Barred Owl, while this is a review species in the state, and this record has not yet been reviewed by the committee, the photos leave little doubt as to this bird’s Identification. The Barred Owl is expanding south through the Sierra Nevada, and before that, the Cascades, and before that, west through the boreal shield. This pattern suggests we are likely to see more of them in Nevada. While the specific reasons for both of these phenomenon are the grounds of much speculation, it is nonetheless interesting to note we are seeing species coming south, and species coming north, of their expected ranges. Nevada is a large state that covers a lot of habitat, and as such, we are uniquely situated at the fringes of many species’ ranges. In my mind, this makes Nevada an extremely interesting place to pay attention to the birds, as we see changes in climate such as those observed in the 2021 field season.
Ned