TALKING ABOUT THE BIRDS AND THE BEES: ABUNDANCE AND DIVERSITY OF BIRDS AND BUMBLE BEES IN BURNED AND UNBURNED RIPARIAN HABITATS IN THE NORTHERN SIERRA NEVADA
Julia S. Polasik; The Institute for Bird Populations; jpolasik@birdpop.org; Helen Loffland, Rodney B. Siegel, Erin Elsey
We conducted non-lethal bumble bee surveys on 413 study plots in meadows and along streams inside and outside the footprint of the 2007 Moonlight fire on Plumas National Forest in 2015. We caught, identified and released 1,243 individual bumble bees of 13 species, including the Western Bumble Bee (Bombus occidentalis), which is increasingly considered a species of management concern in California. Significant declines in Western Bumble Bee from southern British Columbia to central California have been observed but little is known about its current distribution. We describe habitat associations of the different bee species, including elevation range and affinity to particular floral resources, and compare bee survey results between burned and unburned plots along streams and in meadows. In general, we found more bees at higher elevations within our study area, more bees in unburned than moderate or high burn severity plots, and more bees in meadows than along streams. At 181 of the streamside plots, we also conducted point count surveys for birds. We assess how well abundance and diversity of riparian birds predicts the abundance and diversity of bumble bees and explore implications for multi-species conservation planning and identifying priority areas for riparian restoration efforts.
Spatial Analysis of Wildlife-Habitat Relationships