Moreira-Saporiti, Agustín; Teichberg, Mirta (2022): Seagrass abundance in Changuu Island (Unguja Island, Zanzibar Archipelago, Tanzania) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942664, In: Moreira-Saporiti, A; Teichberg, M (2022): Seagrass abundance and morphological, nutritional and biochemical traits in relation to sea urchin Tripneustes gratilla overgrazing [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.942667
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Abstract:
We mapped the seagrass meadows in the study area to calculate the total area covered by each seagrass species and the extent of the overgrazing of T. gratilla. The mapping was performed in low tide with a Garmin GPSmap 78s and a transect tape, making a total of six transects parallel to the coast and 20 perpendicular to the coast to form a grid. We recorded patches of seagrass species directly in the GPS by marking the change in the benthic communities along each transect. The meadows were categorized by species and further sub-categorized as overgrazed or not-overgrazed. A meadow was defined as overgrazed when the shoots in the meadow were lacking leaves and meristems except for sparsely distributed ungrazed individual shoots.
All data points were transferred to the software Quantum GIS (Version 2.10.1 Pisa). We constructed polygons over the seagrass meadows with the data and the plug-in Open Layers and calculated the total cover area per seagrass species (square meters) and the percentage of the total covered by each seagrass species.
Supplement to:
Moreira-Saporiti, Agustín; Hoeijmakers, Dieuwke; Reuter, Hauke; Msuya, Flower E; Gese, Katrin; Teichberg, Mirta (2023): Bottom‐up and top‐down control of seagrass overgrazing by the sea urchin Tripneustes gratilla. Marine Ecology, 44(1), e12734, https://doi.org/10.1111/maec.12734
Funding:
German Research Foundation (DFG), grant/award no. DFG TE 1046/3-1: Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change (SEAMAC)
Coverage:
Latitude: -6.117806 * Longitude: 39.167383
Date/Time Start: 2016-02-22T00:00:00 * Date/Time End: 2016-02-22T00:00:00
Minimum Elevation: 0.0 m * Maximum Elevation: 0.0 m
Event(s):
Unguja_Island_Changuu3 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2016-02-22T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Garmin GPSmap 62sc (GPS) * Comment: The sampling sites consisted of subtidal meadows (1-4 meters depth) of around 2500 square meters, delimited by the coastline and a fringing reef.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Site | Site | Moreira-Saporiti, Agustín | |||
| 2 | Species | Species | Moreira-Saporiti, Agustín | Of seagrass | ||
| 3 | Status | Status | Moreira-Saporiti, Agustín | Overgrazing status (Yes/No) | ||
| 4 | Seagrass, cover | Seagr cov | m2 | Moreira-Saporiti, Agustín | Calculated, see abstract | |
| 5 | Seagrass, cover | Seagr cov | % | Moreira-Saporiti, Agustín | Calculated, see abstract |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
30 data points