Moreira-Saporiti, Agustín; Teichberg, Mirta (2022): Density of Tripneustes gratilla in different seagrass meadows in Changuu Island (Unguja Island, Zanzibar Archipelago, Tanzania) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942661, 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:
To assess the sea urchin distribution across the seagrass species, we measured the sea urchin density in three monospecific meadows (T. ciliatum, C. serrulata and H. uninervis) and two mixed meadows (dominated by T. hemprichii and by S. isoetifolium) in the study site. We selected three patches per meadow type. Each patch was 25 square meters, delimited with a transect tape. We counted the number of sea urchins at high tide, and divided this number by the surface of the patch to calculate sea urchin density per square meter of meadow (individuals per square meter).
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: 2016-01-15T00:00:00 * Date/Time End: 2016-01-15T00:00:00
Minimum Elevation: 0.0 m * Maximum Elevation: 0.0 m
Event(s):
Unguja_Island_Changuu2 * Latitude: -6.117806 * Longitude: 39.167383 * Date/Time: 2016-01-15T00:00:00 * Elevation: 0.0 m * Location: Zanzibar Archipealgo, Tanzania * Method/Device: Biodiversity mapping (BIOMAP) * 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 | Number | No | Moreira-Saporiti, Agustín | Of meadow | ||
| 4 | Area | Area | m2 | Moreira-Saporiti, Agustín | Of meadow | |
| 5 | Tripneustes gratilla | T. gratilla | # | Moreira-Saporiti, Agustín | Counted | |
| 6 | Tripneustes gratilla | T. gratilla | #/m2 | Moreira-Saporiti, Agustín | Calculated, see abstract |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
90 data points
Data
| 1 Site | 2 Species | 3 No | 4 Area [m2] | 5 T. gratilla [#] | 6 T. gratilla [#/m2] |
|---|---|---|---|---|---|
| Changuu2 | Thalassodendron ciliatum | 1 | 25 | 43 | 1.72 |
| Changuu2 | Thalassodendron ciliatum | 2 | 25 | 32 | 1.28 |
| Changuu2 | Thalassodendron ciliatum | 3 | 25 | 63 | 2.52 |
| Changuu2 | Cymodocea serrulata | 1 | 25 | 2 | 0.08 |
| Changuu2 | Cymodocea serrulata | 2 | 25 | 7 | 0.28 |
| Changuu2 | Cymodocea serrulata | 3 | 25 | 1 | 0.04 |
| Changuu2 | Halodule uninervis | 1 | 25 | 3 | 0.12 |
| Changuu2 | Halodule uninervis | 2 | 25 | 0 | 0.00 |
| Changuu2 | Halodule uninervis | 3 | 25 | 1 | 0.04 |
| Changuu2 | Thalassia hemprichii | 1 | 25 | 18 | 0.72 |
| Changuu2 | Thalassia hemprichii | 2 | 25 | 11 | 0.44 |
| Changuu2 | Thalassia hemprichii | 3 | 25 | 11 | 0.44 |
| Changuu2 | Syringodium isoetifolium | 1 | 25 | 13 | 0.52 |
| Changuu2 | Syringodium isoetifolium | 2 | 25 | 5 | 0.20 |
| Changuu2 | Syringodium isoetifolium | 3 | 25 | 5 | 0.20 |