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For stable isotope analysis, small subsamples of homogenously ground oyster tissues in the scintillation vial are placed in the tin capsule, held by the forceps. — Ground oyster tissue and tin capsule

Sediment slurries in 125 mL Erlenmeyer flasks capped with rubber stoppers to prevent gas exchange for indirect measurements of denitrification using acetylene inhibition techniques — Sediment slurries

Water samples from the Patuxent River are prepared for analysis on board the R/V Aquarius — Water sample preparation

A sediment core has been collected and is being prepared for storage and analysis by carefully filling the core with water from the sample site to minimize disturbance. — Sediment core preparation

Water samples from the Patuxent River are collected and prepared for analysis on board the R/V Aquarius — Water sample analysis

A sediment slurry was mixed and the flask capped to trap gases formed as intermediary steps of denitrification. — Sediment slurry

Sediment slurries in triplicate were mixed and flasks were capped to trap gases released during denitrification — Sediment slurries

Conceptual diagram illustrating how the ecological indicators in a program will affect resources, data management, etc. — Ecological indicators in environmental management

Conceptual diagram illustrating how changes in water quality affect different zones of a waterway. — How water quality influences different zones in a…

Conceptual diagram illustrating how spatial analysis combines a diversity of data sets into a map, overlay, analysis, and other decision tools. — Spatial analysis

Conceptual diagram illustrating the 'wedding cake' design for ecological indicators. Used by the National Park Service, this is how indicators are used to make decisions on a national, regional, and local level. — The 'wedding cake' design

An autoanalyzer setup to measure isotope ratios in dissolved gases in water samples. — Autoanalyzer

Isotope ratio mass spectrometer equipment to analyze dissolved gases in water samples — Isotope ratio mass spectrometer

An old mass spectrometer for analyzing stable isotopes — Isotope ratio mass spectrometer

Isotope ratio mass spectrometer. The tubing allows different gases to flow in and out of the mass spectrometer to meausure gas chemistry and isotope ratios — Isotope ratio mass spectrometer

Isotope ratio mass spectrometer with water bath to set samples at a constant temperature — Isotope ratio mass spectrometer with water bath

Water samples collected for analysis. These samples have been capped and crimped to seal against gas exchange so that dissolved gases can be analyzed. — Water samples

Conceptual diagram illustrating the methodology in analyzing the nitrogen in a water source using macroalgae as a bioindicator. — Nitrogen stable isotope methodology

Scientist using laptop computer

Measuring seagrass shoot length

Collecting water samples in Maryland's Coastal Bays — Collecting water samples