AN ECOSYSTEM-SCALE ASSESSMENT OF THE SPOTTED OWL AND OTHER INDICATORS AS UMBRELLA SPECIES FOR AVIAN BIODIVERSITY

Kristin M Brunk; K. Lisa Yang Center for Conservation Bioacoustics; kb572@cornell.edu; M. Zach Peery, Connor M Wood

The combined effects of over a century of post-colonial forest management, resource extraction and fire suppression, and climate change in the Sierra Nevada are manifesting in larger, more severe fires, a change with dire implications for biodiversity. For decades, Spotted Owl conservation has shaped forest management, with most other species receiving scant attention – if any. The recent establishment of an ecosystem-scale passive acoustic monitoring program across the Sierra Nevada (>1,600 recording sites across ~25,000km2) and machine learning tools capable of identifying most bird species means that comprehensive assessments of the actual umbrella effects of priority species can now be assessed. We used multi-species occupancy models to estimate the probability of co-occurrence of 70 species of Sierra Nevada birds, including the Spotted Owl and other priority species. Preliminary results suggest that 15 of 69 species (22% of the community) are positively associated with Spotted Owl occurrence, a similar number of non-overlapping species are positively associated with Fox Sparrows, and very few species are associated with the relatively scarce Black-backed Woodpecker. Quantifying the umbrella effects of what have been assumed to be complementary indicator species can help inform urgently needed forest restoration to maximize short-term biodiversity conservation before the presumed long-term benefits of such interventions accrue.

Ecology and Conservation of Birds - II