Program Info

Given the importance of oysters in estuarine ecosystems, it is the goal of the Guana Tolomato Matanzas National Estuarine Research Reserve (GTM NERR) to understand the status of local oyster populations and the reef habitats they build, and to track changes over time. Methods were developed for use on intertidal reefs of Crassostrea virginica using the following body of work as general guidance: Baggett (2014), Dix (2010), Volety & Savarese (2001). Original applications of these methods are documented in a report summarizing a pilot oyster monitoring project within the GTM NERR conducted from 2014-2016 (linked below). The methods were developed for assessing baseline reef, population, and community structure on intertidal oyster reefs within sub-estuaries of the ~76,000-acre reserve. In 2022, annual long-term monitoring was initiated using refined protocols and a sub-estuary rotation approach.
number and sizes of all live oysters, mussels and clams (mm), numbers and ID of barnacles, crabs and gastropods present, carapace width (mm), rugosity (chain length - linear length), percent cover (point intercept method), reef height (m), oyster clump density (#/m^2)
Gray et al. 2021. Beyond residence time: Quantifying factors that drive the spatially explicit filtration services of an abundant native oyster population.
Sampling of randomly-selected reefs using randomly positioned quadrats along a transect. Quadrats positioned randomly along a transect line on each reef. Percent cover assessed using 1m x 1m quadrats and point-intercept method; samples for oyster measurements and faunal census taken using a 25cm x 25cm quadrat and excavated to 15cm depth.
Data from 2018 were added because they were collected in association with the Historical Oyster Body Size Project; 2020 data were collected in association with another project
Data Location
Data Format
xlsx, docx, pdf
Oyster/Oyster Reef
SEACAR Citation
Florida Department of Environmental Protection (DEP); Office of Resilience and Coastal Protection (RCP); Guana Tolomato Matanzas National Estuarine Research Reserve (GTMNERR). (2022). Guana Tolomato Matanzas NERR Oyster monitoring. Updated 07/10/2023. Distributed by: SEACAR Data Discovery Interface, Office of Resilience and Coastal Protection, Florida Department of Environmental Protection.
Alternative Citation

indicates priority attributes

Katie Petrinec

SWMP Data Specialist

Export Standardized Data

Habitat(s) : Indicator(s) Last Updated File Download
Oyster/Oyster Reef : Density, Percent Live, Size Class 09/20/23 10:11 PM Download File - Oyster - 4000.txt
DIP Document N/A Download File - DIP

Office of Resilience and Coastal Protection Managed Areas

Guana River Marsh, Guana Tolomato Matanzas NERR


Oyster/Oyster Reef - Density
Oyster/Oyster Reef - Percent Live
Oyster/Oyster Reef - Size Class
Oyster/Oyster Reef - Additional Indicators

Documentation and Data provided by program

File Type File Name Added On Details
Data GTM Oyster Monitoring Data (2014-2023)_SEACAR.xlsx 06/19/23 03:50 PM View Details
Data GTM Oyster Monitoring Data.xlsx 04/21/20 04:54 PM View Details
Data ID_4000 Updated 08/06/19 10:06 AM View Details
Data Oyster Monitoring Data.xlsx 10/26/18 09:31 AM View Details
Data Reef Master.xlsx 10/26/18 09:31 AM View Details
Data Winter2022_SEACAR.xlsx 04/05/22 04:06 PM View Details
GIS Oyster Monitoring Dataupdated.xlsx 11/08/18 01:32 PM View Details
Logo DEP_logo_2019.png 04/08/19 01:57 PM View Details
Protocols GTM Oyster Monitoring Protocol 1.3.pdf 10/26/18 09:31 AM View Details
Protocols GTMNERR_Oyster Monitoring_SOPv2.0_Final.pdf 07/27/23 05:00 PM View Details
Report 2014-2016 GTM oyster monitoring.pdf 10/26/18 09:31 AM View Details
Report 2021.Gray et al_BeyondResidenceTime_oyster filtration ecosystem scale.pdf 07/27/23 05:00 PM View Details