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GCE-LTER Project News

November 2023 Calendar

MicroCAT maintenance
dates: 11/28/2023 to 11/29/2023
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Latest Data Releases

09/01/2023 – Data Release

Data set titled 'Wrack classification data based on UAV imagery from Dean Creek on Sapelo Island, GA' was added to the GCE data catalog.  You can view the data set here:  GIS-GCET-2308

Abstract:  We used a DJI Matrice 210 UAV with a MicaSense Altum to collect a total of 20 images from January 2020 - December 2021 in a the Dean Creek marsh on Sapelo Island, GA. Wrack was classified using a principal component analysis. Wrack patches under 1 m2 were excluded from analyses. Wrack classifications were converted to polygon and point data where each point represents a 5 cm x 5 cm pixel. Those files were then used to analyze wrack characteristics, their relation to environmental drivers, and landscape based patterns. For both polygon and point data, we used the National Elevation Dataset (https://gdg.sc.egov.usda.gov/Catalog/ProductDescription/NED.html) to determine the elevation of each wrack patch. Creeks and shorelines were digitized and used to determine each wrack patches' distance to water. We calculated the frequency of wrack deposition at each point by adding together the number of images where that pixel was classified as wrack over the course of the study. Polygon data were related to tide height from a NOAA tidal station data product (Ft. Pulaski, Station 8670870; https://tidesandcurrents.noaa.gov) and wind speed and wind direction from the Marsh Landing weather station (downloaded data for the SAPMLMET met station from: https://cdmo.baruch.sc.edu/) to evaluate the relationship of wrack to environmental drivers.

Citation: Lynn, Tyler. 2023. Wrack classification data based on UAV imagery from Dean Creek on Sapelo Island, GA. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network.  http://dx.doi.org/10.6073/pasta/964d3375e5bbc81847fa72093bb087ef

09/01/2023 – Data Release

Data set titled 'Pred-Ex: Long Term Salt Marsh Predator Exclusion Experiment Conducted at Sapelo Island, GA' was added to the GCE data catalog.  You can view the data set here:  MSH-GCED-2308

Abstract:  In southeastern USA salt marshes, short-term and small-scale experiments indicate that a trophic cascade benefits the foundation plant Spartina alterniflora: marine predators (nekton) positively affect plant biomass by consuming snail and crab herbivores. To test how nekton affect marsh processes when the entire animal community is present, and to test how prior results scale up over time, we conducted a 3-year predator exclusion experiment in a Georgia salt marsh using replicated 19.6 m2 plots. We measured the response of changing density for all marsh invertebrates, conducted snail and crab tethering trials, quantified change in marsh grass biomass, and measured tea bag decomposition rate across all plots.

Citation: Hensel, Marc Simon. 2023. Pred-Ex: Long Term Salt Marsh Predator Exclusion Experiment Conducted at Sapelo Island, GA. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/a2c9c9b9541c511c3e4bfab5e8e4d639

07/24/2023 – Data Release

The Historical Palmer Drought Indices data sets on the GCE Data Portal have been updated through June 2023. These data sets include monthly calculations of the Palmer Drought Severity Index, Palmer Hydrological Drought Index, Palmer Modified Drought Index and Palmer Z-index for Georgia Region 9 (coastal counties and Sapelo Island) from January 1895 though June 2023.

More information about these indices as well as links to the original NOAA maps and data pages as well as processed data sets covering the entire USA are available from the GCE Data Portal here.

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Latest File Uploads

11/20/2023 – Spreadsheet (GCE only)
Maintenance log for the GCE Flux Tower (details)

10/27/2023 – Document (GCE only)
Georgia DNR Research Requirements and Application Form and Revocable License Request - September 2021 (details)

09/28/2023 – Photograph
Agalinis purpurea photograph (details)

09/27/2023 – Document
Fall monitoring barnacle pole protocol (details)

09/27/2023 – Document
Flux Tower Monthly Vegetation Monitoring Protocol (details)

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GCE Project Announcements

11/17/2023 – Meeting

We won’t be having an all-hands in-person GCE meeting this winter because a subset of us will be writing the next GCE proposal. But there’s so much interesting work being done that we want to provide updates, so we’ll do that with a webinar on December 18, 9-12 Eastern Time. Please put the date on your calendar!

(contact Steve Pennings for additional information)
11/02/2023 – Personnel News

The Georgia Coastal Ecosystems LTER program (https://gce-lter.marsci.uga.edu) has two openings for a Research Professional to assist with coastal ecology research on the Georgia coast. Both positions are part of a team that will work on Sapelo Island, GA.

(keep reading)

(contact Steve Pennings for additional information)
10/23/2023 – Monitoring Program

Last week, the field crew completed invertebrate monitoring for the site-wide fall monitoring program, finishing at the GCE on-island sites. Now on to measuring snails!

John and Jonah at beautiful Site 3

(contact Laura Hollander for additional information)
10/23/2023 – Education News

Jessica Cook, a part participant in the GCE Schoolyard LTER program from Liberty Elementary School in Midway, Georgia, was recently awarded the Bright Ideas Grant for her proposal "Young Ecologists Exploring High Marsh Ecosystems!"

(keep reading)

(contact Wade Sheldon for additional information)
10/19/2023 – Website Addition

We have been experimenting with ways to leverage existing GCE Information Management System components as we consider developing a more maintainable and engaging public website with a modern framework such as WordPress. One of our primary targets is the GCE Data Catalog, of course, and this week we began testing light-weight tools to create an interactive interface for discovering GCE data sets to download. One of our test applications is very promising, so we decided to deploy it on the current GCE website as an alternative to the existing browse and search interfaces and to gather feedback on usability.

(keep reading)

(contact Wade Sheldon for additional information)
10/09/2023 – Monitoring Program

The hardest day of fall monitoring is sites 7 and 8. A long boat ride, tall vegetation that tries to cut you up, and multiple plant species. It's done!

Eamon, Kalpana, Jonah and Steve after working sites 7 and 8

(contact Steve Pennings for additional information)

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959, OCE-1237140 and OCE-1832178. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.