First Advisor

Mark Sytsma

Term of Graduation

Summer 2000

Date of Publication


Document Type


Degree Name

Master of Science (M.S.) in Biology






Carcinus maenas -- Oregon -- Yaquina Bay, Intertidal ecology -- Oregon -- Yaquina Bay, Biological invasions -- Oregon -- Yaquina Bay



Physical Description

1 online resource (71 pages)


This thesis examines the potential impact of the invasive green crab, Carcinus maenas, in Yaquina Bay, Oregon. I sampled the current extent of crab colonization in the intertidal zone of Yaquina Bay using a standardized trapping regimen in selected intertidal sites in August and September 1999. I also evaluated the potential impacts of C. maenas on the commercially important bivalve, Crassotrea gigas. Carcinus' preferred size ranges of C. gigas and other species were experimentally determined. Additionally, Carcinus species preference for C. gigas was examined in relation to two common bivalves, Mytilus trossolus and Macoma nasuta. Experiments were also conducted to see if C. maenas distinguished between two mussels species, M trossolus, the native mussel found in natural populations in Oregon, and M galloprovincialis, a popular aquaculture species in the Pacific Northwest. I also examined the potential impacts of C. maenas on meiofauna assemblages in a manipulative field experiment.


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