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- The European green crab, Carcinus maenas, is a generalist predator that has established invasive populations throughout the
world, including the west coast of North America. In Oregon, strong cohorts of green crabs recruit only during major El Niño
events. The goals of this study are to: 1) compare the abundance and growth of the recent 2014-2015 El Niño cohort to that of
the strong 1997-1998 El Niño in Yaquina Bay, Oregon, and 2) explore the spatial and vertical distribution of C. maenas and how
it relates to that of the native red rock crab, Cancer productus. An abundance and size distribution similar to the 1997-98 cohort
was observed, indicating favorable current patterns and growing conditions brought on by the strong El Niño. We did not find a
correlation between the spatial distribution of C. productus and C. maenas, however it is possible that the distribution is related to
the dynamics of the bay or microhabitat preference. Our data suggests a negative correlation in the vertical tidal distribution of
the two species, supporting the hypothesis that C. productus sets the vertical lower limit of C. maenas. Observations of the
interactions of the two species in the same trap support this hypothesis. Future studies should follow the 2015 year class and its
effects on the local ecosystems. These data could prove a valuable tool in making predictions on the indirect effects of El Niño or
the establishment of a self-sustaining C. maenas population in Yaquina Bay
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- description.provenance : Approved for entry into archive by Steven Van Tuyl(steve.vantuyl@oregonstate.edu) on 2017-05-18T21:04:14Z (GMT) No. of bitstreams: 2
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- description.provenance : Submitted by Christopher Lundeberg (lundebec@oregonstate.edu) on 2017-05-11T23:27:20Z
No. of bitstreams: 2
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