Program and Agenda

Abstract

RED WATER BLOOM INITIATION IN THE COLUMBIA RIVER ESTUARY

Annual red water blooms of the photosynthetic ciliate, Mesodinium rubrum, have occurred each summer over (at least) the past several decades in the Columbia River estuary. Bloom formation in this species is well known in estuaries and upwelling systems worldwide, generally under salinity-stratified conditions. In the Columbia River estuary, M. rubrum forms dense patches characterized by locally elevated dissolved oxygen levels, low inorganic nutrient concentrations, and limited diversity of eukaryotic plankton. Based on several years of data from in situ sensors and shipboard observations, we identify several factors that correlate with the timing of the blooms, such as a threshold of river discharge below 4000 m^3/s, water residence time anomalies during the month of July, and salinity greater than 5. Using this information, we formulate a likely set of criteria for bloom initiation and discuss the influence that human activities such as dam operations have likely had on the dynamics of the annual bloom.

ePoster:

Authors

Peterson, T. D., Oregon Health & Science University, USA, petertaw@ohsu.edu

Needoba, J. A., Oregon Health & Science University, USA, needobaj@ebs.ogi.edu

Roegner, G. C., NOAA Fisheries, USA, curtis.roegner@noaa.gov

Herfort, L., Oregon Health & Science University, USA, herfortl@ebs.ogi.edu

Baptista, A. M., Oregon Health & Science University, USA, baptista@stccmop.org

Details

Poster presentation

Session #:046
Date: 2/26/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 2926