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Relationships among upwelling, phytoplankton blooms, and phycotoxins in coastal Oregon shellfish


Tweddle, JF and Strutton, PG and Foley, DG and O'Higgins, L and Wood, AM and Scott, B and Everroad, RC and Peterson, WT and Cannon, D and Hunter, M and Forster, Z, Relationships among upwelling, phytoplankton blooms, and phycotoxins in coastal Oregon shellfish, Marine Ecology - Progress Series, 405, (April) pp. 131-145. ISSN 0171-8630 (2010) [Refereed Article]

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Copyright © 2010 Inter-Research

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DOI: doi:10.3354/meps08497


Climatologies derived from satellite data (1998 to 2007) were used to elucidate seasonal and latitudinal patterns in winds, sea surface temperature (SST), and chlorophyll concentrations (chl) over the Oregon shelf. These were further used to reveal oceanographic conditions normally associated with harmful algal blooms (HABs) and toxic shellfish events along the Oregon coast. South of 43° N, around Cape Blanco, summer upwelling started earlier and finished later than north of 43°N. Spring blooms occur when light limitation is relieved, before the initiation of upwelling, and secondary, more intense blooms occur approximately 2 wk after upwelling is established. North of 45°N, SST and chl are heavily influenced by the Columbia River plume, which delays upwelling-driven cooling of the surface coastal ocean in spring, and causes phytoplankton blooms (as indicated by increased chl) earlier than expected. The presence of saxitoxin in coastal shellfish, which causes paralytic shellfish poisoning, was generally associated with late summer upwelling. The presence of domoic acid in shellfish, which leads to amnesic shellfish poisoning, was greatest during the transition between upwelling and downwelling regimes. This work demonstrates that satellite data can indicate physical situations when HABs are more likely to occur, thus providing a management tool useful in predicting or monitoring HABs.

Item Details

Item Type:Refereed Article
Keywords:Oregon coast · California Current · Upwelling · Bloom timing · Harmful algae, Paralytic shellfish poisoning · Domoic acid poisoning · Saxitoxin·
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Strutton, PG (Professor Peter Strutton)
ID Code:68206
Year Published:2010
Web of Science® Times Cited:21
Deposited By:IMAS Research and Education Centre
Deposited On:2011-03-10
Last Modified:2012-03-06
Downloads:2 View Download Statistics

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