Mary Barnewitz, University of Utah
Social and Behavioral Sciences
Analysis of archaeofaunal remains aids in the understanding of the ecological effects of past human prey-species exploitation. Sea otters (Enhydra lutris), in particular, were intermediate-return prey for late Holocene human populations along the California coastline. At the Yerba Buena Shellmound, on the San Francisco Peninsula, there is significant evidence of sea otter use by the local human inhabitants from 1950-1000 14C YBP. This study aims to investigate the use of sea otters at this site in order to address the implications of human subsistence patterns and the use of natural resources during this time period. The study will examine sea otter epiphyseal fusion and tooth crown height as measures of age, as well as comparative indices with other larger and smaller prey animals, in order to determine the age structure and abundance of this prey species over the time of site occupation. Given the breeding ecology of the sea otter, prey depression is often signaled by an increase in mean age over time. Prey resource depression is also signaled by decreases in the use of large-prey animals, and an increase in the lower return, small prey. Comparing the sea otter remains in the site to other taxa will provide more information regarding the significance of sea otters as prey. In general, a mean age increase in sea otters is indicated by the Yerba Buena sea otter tooth remains, but to a much lesser extent by the fused and unfused sea otter bone specimens. The interpretations of the comparative indices are still in progress. Nevertheless, the preliminary results support other evidence revealing over-exploitation of local resources in the San Francisco Bay area. Understanding the effect of past human behavior and subsistence patterns on local ecology is an important pursuit as it can help guide our management of future ecological resources.