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Methods for processing and imaging marsh foraminifera

November 15, 2011

This study is part of a larger U.S. Geological Survey (USGS) project to characterize the physical conditions of wetlands in southwestern Louisiana. Within these wetlands, groups of benthic foraminifera-shelled amoeboid protists living near or on the sea floor-can be used as agents to measure land subsidence, relative sea-level rise, and storm impact. In the Mississippi River Delta region, intertidal-marsh foraminiferal assemblages and biofacies were established in studies that pre-date the 1970s, with a very limited number of more recent studies. This fact sheet outlines this project's improved methods, handling, and modified preparations for the use of Scanning Electron Microscope (SEM) imaging of these foraminifera. The objective is to identify marsh foraminifera to the taxonomic species level by using improved processing methods and SEM imaging for morphological characterization in order to evaluate changes in distribution and frequency relative to other environmental variables. The majority of benthic marsh foraminifera consists of agglutinated forms, which can be more delicate than porcelaneous forms. Agglutinated tests (shells) are made of particles such as sand grains or silt and clay material, whereas porcelaneous tests consist of calcite.

Publication Year 2011
Title Methods for processing and imaging marsh foraminifera
DOI 10.3133/fs20113098
Authors Chandra A. Dreher, James G. Flocks
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Fact Sheet
Series Number 2011-3098
Index ID fs20113098
Record Source USGS Publications Warehouse
USGS Organization St. Petersburg Coastal and Marine Science Center