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JPR Advance Access originally published online on July 15, 2007
Journal of Plankton Research 2007 29(9):769-774; doi:10.1093/plankt/fbm058
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

A Phaeocystis globosa bloom associated with upwelling in the subtropical South Atlantic Bight

J. D. Long{dagger}, M. E. Frischer* and C. Y. Robertson

Skidaway Institute of Oceanography, Savannah, GA 31411, USA

* Corresponding Author: marc.frischer{at}skio.usg.edu

Received on March 21, 2007; accepted on July 5, 2007


  Abstract

We observed an unusual, subtropical bloom of Phaeocystis globosa Scherffel during a strong upwelling event and confirmed its identity using morphological, physiological and genetic traits. This low-latitude bloom of P. globosa colonies occurred on the South Atlantic Bight continental shelf during the summer of 2003. Maximum chlorophyll a concentration measured during this subsurface bloom was 11.37 µg L–1 at 31 m depth. Divers reported abundant flocculent material below the steep thermocline, and this material was identified as Phaeocystis sp. using microscopy. Using morphological and physiological traits as well as the sequence of the 18S small subunit ribosomal RNA gene (GenBank Accession # EF100712), this phytoplankton was identified as P. globosa. Interactions of physical and biological conditions may restrict low-latitude P. globosa blooms to strong upwelling events.

{dagger} Present Address: Northeastern University Marine Science Center, Nahant, MA 01908, USA

Communicating editor: K.J. Flynn


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