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This article presents analyses of lithic and zooarchaeological data from the Kuril Islands and Sakhalin Island in the Russian Far East to better understand the effects of island isolation and biodiversity on human settlement and subsistence. Using the theory of island biogeography, we examine predictions about lithic raw material use, trade, mobility, and foraging behavior for different island groups. This study finds convincing evidence that insularity imposed significant constraints on prehistoric maritime hunter-gatherer access to lithic raw materials and foraging targets in this part of the North Pacific. We find that lithic raw materials are constrained in their distribution and conserved in more insular areas, while zooarchaeological taxonomic composition and richness data pattern according to expectations from optimal foraging theory applied across islands of variable biogeographic diversity. While based on limited samples, the results of these analyses provide support for a biogeographical approach to the prehistory of islands and add to our understanding of human adaptation in the Sea of Okhotsk.

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Understanding a species’ historic range guides contemporary management and habitat restoration. Chinook salmon (Oncorhynchus tshawytscha) are an important commercial and recreational gamefish, but nine Chinook subspecies are federally threatened or endangered due to anthropogenic impacts. Several San Francisco Bay Area streams and rivers currently host spawning Chinook populations, but government agencies consider these non-native hatchery strays. Through the morphology-based analysis of 17,288 fish specimens excavated from Native American middens at Mission Santa Clara (CA-SCL-30H), Santa Clara County, circa 1781–1834 CE, 88 salmonid vertebrae were identified. Ancient DNA sequencing identified three separate individuals as Chinook salmon and the remainder as steelhead/rainbow trout (Oncorhynchus mykiss). These findings comprise the first physical evidence of the nativity of salmon to the Guadalupe River in San Jose, California, extending their documented historic range to include San Francisco Bay’s southernmost tributary watershed.

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