California Water Science Center Scientists Share Their Research at 2025 IEP Annual Workshop
From March 4th through the 6th, Scientists from the USGS California Water Science Center presented their research at the at 2025 Interagency Ecological Program (IEP) Workshop in Sacramento. The Interagency Ecological Program (IEP) Workshop is held each spring for sharing new research results that advance science important to IEP and the larger Delta science community.
The workshop featured invited speakers, interactive sessions, poster session, and a luncheon for early career professionals. USGS presentations, with their California Water Science Center presenters, were as follows:
PRESENTATIONS
TALKS
Suspended Sediment and Turbidity in the Sacramento-San Joaquin Delta, California, Influenced by an Unregulated Watershed During the Wet Water Year of 2023
Tara Morgan-King*, Jon Burau
Using Genome Resolved Metagenomics to Assess the Taxonomic, Metabolic, and Toxigenic Diversity of Cyanobacteria in the Delta
Keith Bouma-Gregson* and other non-USGS presenters
Comparative Analysis of Primary Production and Nutrient Cycling in Shoal and Channel Regions of the San Francisco Bay and Sacramento-San Joaquin Delta
Alexander R. Ryan*, Emily T. Richardson, Jacob D. Brinkman, Katy O'Donnell, Brian A. Bergamaschi
Investigating Drivers of Phytoplankton Dynamics in the South Delta
Nick Framsted*, Crystal Sturgeon, Tamara Kraus, Keith Bouma-Gregson, and other non-USGS presenters
Vertical Mixing in Dead-End Channels of the Delta
Sienna White*, Tia Böttger, Keith Bouma-Gregson, Lisa Lucas, and other non-USGS presenters
Investigating Phytoplankton Community Dynamics During the August 2022 Heterosigma akashiwo Bloom in San Francisco Bay, California
Schuyler Nardelli*, Keith Bouma-Gregson, Erica Nejad, Emily Richardson, Brian Bergamaschi, and other non-USGS presenters
*Presenting author
LIGHTNING TALKS WITH POSTERS
Long-Term Continuous Flow Monitoring in the Sacramento-San Joaquin Delta
Lex Thomas -- Speaker
Elise Shea, Anna Conlen, Lex Thomas -- Poster
Long-Term Suspended-Sediment Monitoring in the Sacramento-San Joaquin Delta and San Francisco Bay
Bryan Gopez -- Speaker
Emma Walker, Joseph Hatfield, Bryan Gopez -- Poster
Presenters from California Water Science Center Biogeochemistry group at 2025 IEP Workshop. Left to Right: Back Row - Maura Uebner, Keith Bouma-Gregson, Kyle Leathers; Middle Row - Crystal Sturgeon, Zoё Siman-Tov, Lane Bratz, Emily Richardson, Tamara Kraus, Alex Ryan; Front Row - Nick Framsted
POSTERS
Poster presenters at 2025 IEP Workshop. Clockwise from upper left: Anna Conlen, Elise Shea, Lex Thomas, Zoё Siman-Tov, Bryan Gopez, Emma Walker, David Hart, Maura Uebner, Lawrence Fujiwara, Trevor Violette
This year's poster presentations included...
Highlights from the Long-term USGS San Francisco Bay Water Quality Measurement Program
Erica Nejad*, Heidi Bockisch, Tara Schraga, Tamara Kraus, Brian Bergamaschi, Joel Fritsch, and other non-USGS presenters
Landscape-Scale Wildfires in Northern California Lead to Dramatic Increases in Timberland Herbicide Use
James Orlando*, Matthew DeParsia, and other non-USGS presenters
Dense and diverse: An overview of abundant USGS water quality data in the San Francisco Bay and Delta
Maura Uebner*, Kyle Nakatsuka, Dylan Burau, Crystal Sturgeon, Tommy (Hieu) Ly, Nathan Jumps, Patrick Dellwo, Tim Baxter, Ariana Maestas, Amelia Ayers, Malanyon Adams, Tyler Beddingfield, Lane Bratz, Noelle Teske, Morgan Illman, Tamara Kraus, Brian Bergamaschi, Keith Bouma-Gregson
Observed implications of anti-fouling paint on water quality data retention and reliability
Samantha Dittrich*
DeltaSMASH: Hyperspectral Remote Sensing of Harmful Algal Blooms in the San Francisco Bay and Delta
Xavier Garcia Lopez*, Brian Bergamaschi, Dulcinea M. Avouris, Carl Legleiter
Utilizing ArcGIS Field Maps Mobile Phone Apps for Field Operations
Lawrence Fujiwara*
Velocity and Bubble-Field Mapping Around the Georgiana Slough Salmonid Migratory Barrier with ADCP and sUAS-Based Image-Velocimetry, 2023–2025
Trevor Violette*, Dr. Carl Legleiter, Paul Kinzel
Do the hydrodynamics of a dead-end channel give “rise” to phytoplankton blooms?
Tia Böttger*, Brian Bergamaschi, Lisa Lucas, Keith Bouma-Gregson, and other non-USGS presenters
Active Chlorophyll Fluorescence Methods for Measuring Primary Productivity in the Sacramento-San Joaquin Delta
Zoё Siman-Tov*, Keith Bouma-Gregson, Jacob Brinkman, Katy O’Donnell
*Presenting author
Read all the presentation and poster abstracts on the 2025 IEP Workshop website.
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