Ocean Acidification & Harmful Algal Blooms: Defining a Research Agenda

A virtual workshop August 11-13th, 2020

Hosted by NOAA's National Centers for Coastal Ocean Science and Ocean Acidification Program

During June and July a webinar series set the foundation for the workshop - a recording of all of the presentations can be found below!

Contact elizabeth.turner@noaa.gov with any questions about the workshop or webinars!


This workshop aimed to determine a few tractable OA-HAB research priorities for potential  inclusion in an upcoming RFP during our time together by identifying:  

  • gaps in OA-HAB research; and
  • potential useful research products that incorporate OA-HAB interactions

  • view AGENDA 



    June 17th                          2pmET

                               June 24th  1:30pmET     

    June 26th    1:00pmET


    June 29th  1:00pmET


      July 8th           1:00pmET

                                            July 10th   1::30pmET

                                    July 13th    2:00pmET

      July 15th    2:00pmET


    Chris Gobler, Stonybrook University

    Raphe Kudela, University of California Santa Cruz

    Hans Paerl, University of North Carolina

    Clarissa Anderson, University of California San Diego; Samantha Siedlecki, University of Connecticut; Jan Newton University of Washington

    Beth Stauffer, University of Louisiana

    Regan Errera, Great Lakes Environmental Research Laboratory

    Melissa McCutcheon, Texas A&M Corpus Christi\

    Kris Holderied, NOAA National Centers for Coastal Ocean Science


    HABs and ocean acidification: Additive, synergistic, antagonistic, or otherwise?

    Synergies Between OAH and HAB Networks: California as a Case Study

    Acidification, eutrophication and HABs in estuarine waters:  What do long-term data tell us?

    Modeling and Forecasting OA and HABs to meet stakeholders needs – Regional Perspectives                                                                                                                                                                                                                                                                                                                                                                    

    A marginal sea of variability in ocean acidification and harmful algal blooms in the Gulf of Mexico

    Acidification and Harmful Algal Blooms in the Great Lakes                                                                  

                                                                                                 Effects of Ocean Acidification on HABs: A review of what we do and don't know

    Alaska Acidification and HABs: Networking and coastal variability


    A marginal sea of variability in ocean acidification and harmful algal blooms in the Gulf of Mexico

    Wednesday, July 8, 2020

    A marginal sea of variability in ocean acidification and harmful algal blooms in the Gulf of Mexico

    Ocean acidification (OA) in the Gulf of Mexico (GOM) is driven by different physical and biogeochemical factors across the region, with most data available on the eastern and northern regions and very little information from the western or southern parts of the GOM. Upwelling dominates OA variability on the West Florida Shelf, while the northern GOM experiences eutrophication- and hypoxia enhanced OA dynamics due to the influence of the Mississippi River. OA conditions in the GOM are highly variable on an interannual basis due to physical factors such as wind, temperature, precipitation, and water mass distributions. Across the same scales, the occurrence and impacts of harmful algal blooms (HABs) are also highly variable. Of the many HAB taxa present in the GOM, toxic dinoflagellates Karenia brevis and Dinophysis ovum affect Florida and Texas waters, respectively, with significant ecological and economic impacts, while the toxic diatom Pseudo-nitzschia thrives in offshore waters throughout the GOM. Closer to shore, toxic cyanobacteria (Microcystis aeruginosa, Dolichospermum sp., etc.) have been found to contribute significantly to phytoplankton communities and produce toxins in low salinity estuaries from Florida to Louisiana. While laboratory experiments provide insights into the effects of OA (on its own or in combination with other stressors) on growth or toxicity of individual HAB taxa, we are only beginning to learn how phytoplankton communities as a whole change in response to these factors. A relatively small number of studies on competitive advantages for phytoplankton in a high-CO2 environment show a range of outcomes from little to no change in community structure to shifts that favor HAB over non-HAB taxa. This talk will highlight the state of knowledge on the OA-HAB intersection in the GOM while also challenging our community to consider what such fundamental changes in community structure and HAB success mean for ecosystem function in the region. 

    View the recording and complete this questionnaire after viewing.
    Categories: HAB_OA_Workshop |  Tags:

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