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Spatial Extent of Data

USGS Data Source

USGS Thesaurus Keywords

statistical analysis, nutrient content (water), Aquatic Biology, water quality, drinking water use, Water Resources, public supply water use, high frequency, visualization methods, Ecology, Water Quality, phytoplankton, hydrogeology

ISO 19115 Topic Category

inlandWaters, environment, biota

Other Subject Keywords

biogeochemistry, microcystin, picophytoplankton, algae, delta, phytoplankton, high-resolution, California

Place Keywords

Central Valley, Liberty Island, Sacramento-San Joaquin Delta, United States, Suisun Bay, Sacramento River, California

Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025)

This dataset contains multiple types of data characterizing phytoplankton in the Sacramento-San Joaquin Delta (California, USA). 1) Bright field microscopy was used to identify and enumerate phytoplankton community composition; 2) Epifluorescent microscopy was used to enumerate picophytoplankton (phytoplankton cells < 2 microns in diameter) and, 3) a categorical visual index, Microcystis Visual Index (MVI), was used to rapidly estimate the abundance of Microcystis colonies near the surface. Revision History First release: June 22, 2023 Revision 1.1: December 28, 2023 Revision 2.0: December 11, 2025

Get Data and Metadata
Author(s) Emily T Richardson, Keith Bouma-Gregson orcid, Tamara Kraus orcid, Katy O'Donnell orcid, Crystal L Sturgeon orcid, Jeniffer Soto Perez, Ayelet Delascagigas orcid, Kyle K Nakatsuka orcid, Dylan J Burau orcid, Alan D Gelber, Balthasar L Von, Nathan I Jumps, Brian Bergamaschi orcid, Maura Q Uebner orcid, Patrick C Dellwo orcid, Hieu T Ly orcid, Malanyon Adams orcid, Morgan E Illman orcid, Tyler A. Beddingfield, Ariana M Maestas orcid, Amelia Ayers orcid
Publication Date 2023-06-22
Beginning Date of Data 2016-04-07
Ending Date of Data 2025-07-24
Data Contact
Keith Bouma-Gregson
DOI https://doi.org/10.5066/P13L6RZD
Citation Richardson, E.T., Bouma-Gregson, K., Kraus, T., O'Donnell, K., Sturgeon, C.L., Perez, J.S., Delascagigas, A., Nakatsuka, K.K., Burau, D.J., Gelber, A.D., Von, B.L., Jumps, N.I., Bergamaschi, B., Uebner, M.Q., Dellwo, P.C., Ly, H.T., Adams, M., Illman, M.E., Beddingfield, T.A., Maestas, A.M., and Ayers, A., 2023, Phytoplankton Species Composition and Abundance in the Sacramento-San Joaquin River Delta: Microscopic Enumeration of USGS Samples, beginning in 2016 (ver. 2.0, December 2025): U.S. Geological Survey data release, https://doi.org/10.5066/P13L6RZD.
Metadata Contact
Maura Q Uebner
Metadata Date 2025-12-11
Related Publication
Citations of these data No citations of these data are known at this time.
Access public
License http://www.usa.gov/publicdomain/label/1.0/
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Harvest Source: ScienceBase
Harvest Date: 2026-04-24T13:11:32.902Z