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Distribution, Ecology and Potential Impacts of the Chinese Mitten Crab (Eriocheir sinensis) in San Francisco Bay Deborah A. Rudnick, University of California, Berkeley Kathleen M. Halat, University of California, Berkeley Vincent H. Resh, University of California, Berkeley University of California Water Resources Center Technical Completion Report, Project Number: UCAL-WRC-W-881. Published as Contribution no. 206, ISBN 1-887192-12-3
ABSTRACT: The arrival of the Chinese mitten crab to the San Francisco Bay-San Joaquin Delta (Bay-
Delta) ecosystem has been a source of widespread concern. This crab has spread from its
native range, in China, to coastal ecosystems throughout Europe and, most recently, into
North America. The Chinese mitten crab population in California has exploded within the
last decade to cover hundreds of miles of the Bay-Delta and its tributaries. The Chinese
mitten crab is a large, catadromous crab, moving from freshwater habitats where it
spends its juvenile years to saltwater habitats in order to reproduce. In other countries
into which this species has been introduced, the abundance and behavior of the crab has
caused detrimental impacts to fisheries and loss of bank stability in areas where it
burrows.
Through a grant from the Water Resources Center, we set out to examine the ecology,
distribution, and economic and ecological impacts of the Chinese mitten crab in the fresh
and saline waters of San Francisco’s South Bay. The Chinese mitten crab offers
excellent opportunities to: 1) study the population dynamics of an invasive species; 2)
examine differences and similarities for this organism between its native and new
environments; and 3) use research findings to make recommendations for understanding
and control of this organism.
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