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Invasion by a Japanese marine microorganism in western North America

Authors
  • McGann, Mary1
  • Sloan, Doris2
  • Cohen, Andrew N.3
  • 1 U.S. Geological Survey, Menlo Park, CA, 94025, U.S.A. , Menlo Park
  • 2 University of California, Department of Geology and Geophysics, Berkeley, CA, 94720, U.S.A. , Berkeley
  • 3 San Francisco Estuary Institute, Richmond, CA, 94804, U.S.A. , Richmond
Type
Published Article
Journal
Hydrobiologia
Publisher
Springer-Verlag
Publication Date
Mar 01, 2000
Volume
421
Issue
1
Pages
25–30
Identifiers
DOI: 10.1023/A:1003808517945
Source
Springer Nature
Keywords
License
Yellow

Abstract

The earliest record in western North America of Trochammina hadai Uchio, a benthic foraminifer common in Japanese estuaries, is from sediment collected in Puget Sound in 1971. It was first found in San Francisco Bay in sediment samples taken in 1983, and since 1986 has been collected at 91% of the sampled sites in the Bay, constituting up to 93% of the foraminiferal assemblage at individual sites. The species is also present in recent sediment samples from 12 other sites along the west coast of North America. The evidence indicates that T. hadai is a recent introduction to San Francisco Bay, and is probably also not native to the other North American sites. Trochammina hadai was probably transported from Japan in ships' ballast tanks, in mud associated with anchors, or in sediments associated with oysters imported for mariculture. Its remarkable invasion of San Francisco Bay suggests the potential for massive, rapid invasions by other marine microorganisms.

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