butlerlowernwac

butlerlowernwac - On Foraging Models and Lower Columbia...

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On Foraging Models and Lower Columbia Subsistence Change Virginia L. Butler Dept. Anthropology Portland State University
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Acknowledgements - Many people in this session have helped out in many ways over the last 10 years; funding for analysis: USFWS, AINW, CASCADIA - Student help: Greg Baker, Stephanie Butler, Mike Mayhew, Lee Levy, Roy Schroeder, Martha Corcoran, Fred Anderson
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Previous Work - Examined ~2000 yr old archaeo-faunal record in Portland Basin (Butler 2000; using Saleeby 1983, and newer records) - Tested against expectations from foraging theory - Assigned fauna to rank: HIGH vs. LOW salmon minnow/sucker sturgeon eulachon mammals stickleback
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Populatio n Collaps e Time High Low Rank Predicted Prey Response to Changing Human Population Size and Predation Pressure
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Abundance Indices (AIs) NISP High Ranked Taxa NISP High + Low Ranked Taxa - Ratios range 1 – 0: higher the ratio, greater the contribution of high ranked prey - Body Size – proxy measure for rank, larger the body, higher the rank
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Based on Body Size Criteria High Ranked Fishes -- Salmonidae ( Orcorhynchus sp.) Sturgeon ( Acipenser sp ) based on body size criteria Fishbase
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Low Ranked Fishes Eulachon ( Thaleichthys pacificus ) Minnows & Suckers Stickleback ( Gasterosteus aculeatus ) Cyprinidae Catostomidae Fishbase
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0 0.2 0.4 0.6 0.8 1 1.2 0 1 2 3 4 5
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butlerlowernwac - On Foraging Models and Lower Columbia...

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