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Li, B. ., Oregon Health and Science University, Beaverton, USA, lbinglin@gmail.com
Peterson, T. D., Oregon Health and Science University, Beaverton, USA, petersont@stccmop.org
Needoba, J. A., Oregon Health and Science University, Beaverton, USA, needobaj@ebs.ogi.edu
Herfort, L. ., Oregon Health and Science University, Beaverton, USA, herfortl@ebs.ogi.edu
Roegner, C. G., NOAA Fisheries, Hammond, USA, Curtis.Roegner@noaa.gov
Zuber, P. ., Oregon Health and Science University, Beaverton, USA, pzuber@ebs.ogi.edu

INFLUENCE OF UPWELLING AND PREY ABUNDANCE ON THE TIMING AND SPATIAL DISTRIBUTION OF MYRIONECTA RUBRA BLOOMS IN THE LOWER COLUMBIA RIVER ESTUARY

Annually recurring blooms of the photosynthetic ciliate Myrionecta rubra have been observed in the Columbia River estuary (CRE) for several decades. To date, the factors influencing the timing and magnitude of these blooms have not been identified. We examined the temporal relationship between coastal upwelling and M. rubra blooms. Estuary blooms were preceded by strong upwelling in mid-late summer when river flow was reduced. Weekly spatial surveys conducted in 2011 indicated movement from retentive lateral bays out into the estuary main channels. The initiation of strong, sustained coastal upwelling coincided with the timing of bloom initiation within lateral bays during 2007-2011. Microscopic and 18S rRNA gene sequence analyses showed that free-living Teleaulax amphioxeia, the cryptophyte associated with M. rubra, was only present prior to bloom formation within lateral bays. Our study suggests a potential interaction between upwelling and prey population dynamics in M. rubra bloom phenology. Upwelling events, which supply nutrient rich water into the lower CRE, may therefore support M. rubra/T. amphioxeia blooms. Strong upwelling events may therefore be used to forecast M. rubra blooms in the CRE.

Poster presentation

Session #:072
Date: 2/20/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: A0428