Department of Biological Sciences and co-sponsors listed below (Conference/Workshop/Seminar)
Steven Beissinger, Professor, Department of Environmental Science, Policy & Management, and Museum of Vertebrate Zoology; University of California, Berkeley, CA, will present a seminar entitled, "A Century of Climate and Land-Use Impacts on California's Birds and Mammals: The Grinnell Resurvey Project".
Forecasts of global climate change on biodiversity typically relate recent species’ occurrences with climate variables to project future ranges, often with alarming conclusions. While evidence supports temperature-driven range expansions poleward, there is substantial variation in responses among species. Assessments have been limited by evaluating range change over short time spans, or by not accounting for the confounding effects of land-use change and false absences. Historical resurveys – where biodiversity surveys from the past are resampled – provide important opportunities to understand the influence of 20th century environmental change on biodiversity and to establish new benchmarks for understanding future change. Here I report on a 15-year effort to resample locations throughout California that Joseph Grinnell and colleagues originally surveyed for birds and mammals from 1908-1939. This includes resurveys of small mammals and birds across 4500-m elevational (spanning the highest and lowest points in the continental US) and 1250-km latitudinal gradients that comprise California on landscapes of long-protected, iconic national parks (e.g., Yosemite and Death Valley) as well as other public and private lands. Highly variable climates and levels of climate change over the past century provide an important opportunity to decompose the effects of local changes in temperature, precipitation, and land use on site-level turnover of species. Using occupancy modeling to control for variation in detectability, we found substantial heterogeneity in elevational range shifts among bird and mammal species and among regions of California. Local colonizations and extinctions of birds followed trends predicted by their climatic niche, but some species tracked changes in temperature while others tracked precipitation. Despite warming, birds have remained in similar thermal niches simply by adjusting their breeding season 5-12 days earlier, reducing the need to adjust their geographic ranges. Species that responded strongly to climate change also responded strongly to land use change. Metacommunity dynamics suggest a strong potential for a slow erosion of species richness.
Everyone is welcome! Thank you for your support!
This seminar is being co-sponsored by the Environmental & Conservation Sciences (ECS) Graduate Program and Cooperative Sponsorship Committee (CSC). More information...
free and open to public
Biological Sciences & co-sponsors listed above!
Wendy J. Leach email@example.com
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