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Response of natural phytoplankton communities from Green Bay (Lake Michigan) and Maumee Bay (Lake Erie) to laboratory manipulations of nutrient and trace metal availability during late summer 2018

Metadata Updated: January 15, 2024

Microcystins (MC) are a class of cyanotoxins produced by many cyanobacteria taxa. Although toxic to metazoans, the evolution of microcystin pre-dates the appearance of metazoans, and so MC did not originate as a toxin to potential metazoan grazers. One hypothesized functional role of microcystin is the management and acquisition of metals, several of which form complexes with MC intracellularly. Metals are often used to build enzymes within the cell that allow cyanobacteria to use non-preferred nitrogen (N) and phosphorus (P) sources, such as nitrate, urea and organic P. If trace metals are in low supply, primary producers may become limited because of their inability to access these non-preferred N and P forms. Furthermore, if MC are used for metal acquisition and management, we would expect that as demand for these trace metals varies, so will the production of MC. We performed 7 mesocosm experiments in triplicate on naturally occurring phytoplankton communities from two nearshore habitats that experience annual cyanobacterial blooms (Green Bay, Lake Michigan and Maumee Bay, Lake Erie). In these experiments, we provided natural communities with amendments of labile nutrients (NH4+ and/or PO43-) and trace metals (Fe, Zn, Ni and Mo) and measured growth (as chlorophyll a), the relative abundance of MC-producing genes (mcyE gene copies), the relative abundance of MC-producing RNA and the MC concentration. Experiments were performed by James H Larson and Sean W Bailey at the Upper Midwest Environmental Sciences Center (UMESC). Genetic measurements were performed by Erin A. Stelzer (Ohio-Indiana-Kentucky Water Science Center) on samples collected at UMESC. Cyanotoxin measurements were performed by Keith A. Loftin (Kansas Water Science) on samples collected at UMESC.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date January 15, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date January 15, 2024
Publisher U.S. Geological Survey
Identifier USGS:640a1ab9d34e0e602b90ff4f
Data Last Modified 20240110
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id ebbeff3b-192e-43f9-ba69-d2fc37e3634c
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -88.1543,41.4921,-83.2764,44.5435
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash ccb0c1e98b2739123fd448f42406fdca355eae874cd095ff3184a2b8fffd26cc
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -88.1543, 41.4921, -88.1543, 44.5435, -83.2764, 44.5435, -83.2764, 41.4921, -88.1543, 41.4921}

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