Moreira-Saporiti, Agustín; Teichberg, Mirta (2022): Gut content of Tripneustes gratilla in Changuu Island (Unguja Island, Zanzibar Archipelago, Tanzania) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.942663, 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 determine the gut content of T. gratilla, we sampled 10 sea urchins along a transect parallel to the coastline and transported them to the Institute of Marine Sciences (Stone Town, Zanzibar). The urchins were collected upon encounter along the transect with the rule of not collecting urchins from the same seagrass patch. This rule was applied to avoid bias towards specific seagrass species. For this analysis, we weighed the sea urchins, measured their diameter to the nearest millimeter with a ruler, and stored them in a 90% ethanol solution. For the gut content analysis, the sea urchins were opened and the content from the whole digestive tract was extracted. The gut content was placed in a Petri dish, and then transferred to a 250 µm mesh to remove the sediment. After the sediment removal, we weighed the gut content fresh weight. Approximately 1 gram (fresh weight) was taken as a sub-sample from the gut content and placed in a new Petri dish to observe under the magnifying glass. Each sample was compared to an example of seagrass material that was prepared specifically for identification after the grazing and digestion process of each species. We imitated this effect by grinding the seagrass species to a similar size and storing them in 90% ethanol solution. Using this method, we could separate the gut contents into the different seagrass species. Contents were then dried in the oven at 60 degrees for 24 hours to obtain their dry weight, and percentage of each seagrass species in the gut was calculated.
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 | Identification | ID | Moreira-Saporiti, Agustín | Tripneustes gratilla ID | ||
| 3 | Tripneustes gratilla, diameter | T. gratilla diam | cm | Moreira-Saporiti, Agustín | see description in data abstract | |
| 4 | Tripneustes gratilla, weight | T. gratilla w | g | Moreira-Saporiti, Agustín | see description in data abstract | |
| 5 | Tripneustes gratilla, gut content, wet mass | T. gratilla gut cont wm | g | Moreira-Saporiti, Agustín | see description in data abstract | |
| 6 | Tripneustes gratilla, gut content, dry mass | T. gratilla gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | |
| 7 | Gut content, wet mass | Gut cont wm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample total |
| 8 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample total |
| 9 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample algae |
| 10 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample other |
| 11 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample other+algae |
| 12 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample seagrass |
| 13 | Species | Species | Moreira-Saporiti, Agustín | Seagrass species in gut | ||
| 14 | Gut content, dry mass | Gut cont dm | g | Moreira-Saporiti, Agustín | see description in data abstract | Subsample seagrass species |
| 15 | Seagrass in gut, dry mass | Seagr in gut dm | % | Moreira-Saporiti, Agustín | see description in data abstract |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
750 data points