de.pangaea.dataset992559 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-14T07:35:57Z https://doi.pangaea.de/10.1594/PANGAEA.992559 2026-04-09T07:42:15 publication Moreira-Saporiti, Agustín

am.saporiti@gmail.com

https://orcid.org/0000-0002-4798-3775 information author Teichberg, Mirta

mteichberg@mbl.edu

https://orcid.org/0000-0003-1586-738X information author O'Sullivan, Aoife

aoifeosullivan42@gmail.com

author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital Macroalgae biomass, epiphytic biomass on seagrass and phytoplankton biomass in the water column was taken at the end of a nutrient enrichment and macrofauna exclusion experiment. A total of 24 plots were set up parallel to the shore, with presence of the three seagrass species (Syringodium isoetifolium, Thalassodendron ciliatum and Thalassia hemprichii) in each plot. The experiment was the factorial combination of two treatments: macrofauna exclusion using cages (three levels: open, closed and uncaged) and nutrient enrichment using garden NPK fertilizer (two levels: ambient and enriched). Each treatment combination was replicated four times. Exclusion treatment simulates the consequences for the food web of losing a top predators and macrograzers. Nutrient enrichment was simulated by issuing nitrogen-phosphorus-potassium (NPK) [15:9:20] fertilizer pellets. NPK fertilizer fast release pellets were packed into cotton tubes and then into a perforated plastic tubes to simulate slow release of nutrients. The tubes were buried half-way into the sediment to ensure enrichment of both the water column and the sediment. Data was collected at the end of the experiment (Day 63, 19.09.2017). Data collection and experiment took place in Changuu Island (Zanzibar Archipelago, Tanzania; 06˚11'S, 39˚16'E). Changuu Island is located 3 km from Stone Town, Zanzibar's busiest town. Changuu remains relatively unaffected by nutrient runoff pollution. The study area is characterised by a fringing reef around a multi-specific seagrass ecosystem. The substrate is primarily carbonate sediment. Average water depth is approximately 30 cm at Spring Low and 5 m at Spring high tide with an average depth of 2 m. Macroalgae biomass, epiphyte biomass on seagrass and phytoplankton biomass was collected in each experimental plot to study the effect of nutrient enrichment and macrofauna exclusion on the primary producers in the ecosystem. To determine the abundance of macroalgae in the different treatments, the macroalgae biomass was collected at the end of the experiment by removing all visible macroalgae present in the experimental plots. Macroalgae was rinsed with freshwater and dried in the oven at 60°C for 48 hours until constant dry weight. The final dry weight was then divided by the treatment plot surface to obtain g DW m-2. To determine phytoplankton biomass under the different treatments, we quantified Chlorophyll-a concentrations in the water column. Water was collected in a 2-litre bottle from each of the 24 plots at the end of the experiment. The water bottles were kept in the dark in a cooler box upon arrival to the lab and water was then filtered under constant pressure onto pre-combusted (5 h, 450◦C) and pre-weighed Whatman GF/F filters (0.45-μm pore size). Chlorophyll-a was then extracted from the filters in 8 ml of 96% ethanol in glass vials heated for 5 min at 80◦C, covered with aluminum foil, and placed in a rotor at room temperature for ∼24 h. Extracts were subsequently centrifuged at 5,000 rpm for 20 min. Chlorophyll-a absorbance of the supernatant was determined in a Shimadzu UV-1700 photometer, and calculated as μg Chl l−1. To determine epiphyte biomass in the treatments, one seagrass shoot per species was collected at each treatment plot at the end of the experiment. Each shoot was collected in a white mesh bag (<1 mm mesh size). In the laboratory, samples were carefully rinsed in freshwater and all epiphytes were scraped off. The scraped epiphytic biomass was dried at 60° C for 48 hours until constant dry weight, and then weighed (mg DW). The epiphytic biomass was then multiplied by the shoot density of each species. This was then summed to obtain the total epiphytic biomass per unit of area (g DW m-2). completed Moreira-Saporiti, Agustín

am.saporiti@gmail.com

https://orcid.org/0000-0002-4798-3775 information principalInvestigator Chlorophyll a epiphytes Macroalgae Phytoplankton Seagrass tropical seagrass Western Indian Ocean theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact SEAMAC Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change SEATRAIT Seagrass Ecosystem Service Evaluation using a Trait-based Approach theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 39.16728 39.167509 -6.118093 -6.117863 2017-09-19T00:00:00 2017-09-19T00:00:00 Event label thematicClassification Sampling date/time, experiment thematicClassification Day of experiment physicalMeasurement day day LATITUDE thematicClassification GPS in field LONGITUDE thematicClassification GPS in field Site thematicClassification Station label thematicClassification Experimental treatment thematicClassification Level of macrofauna exclusion. Uncaged= no exclusion; Open=no exclusion, control for cage effects; Closed=total exclusion Treatment: nutrients thematicClassification Level of nutrient enrichment. Ambient=no enrichment; Enriched=nutrient enriched Biomass, live, dry weight physicalMeasurement Epiphytes g/m**2 g/m**2 Biomass, live, dry weight physicalMeasurement Macroalgae g/m**2 g/m**2 Chlorophyll a physicalMeasurement µg/l µg/l Type of study thematicClassification text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.992559?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: Changuu_C1_T3 * LATITUDE: -6.117880 * LONGITUDE: 39.167290 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C2_T3 * LATITUDE: -6.117863 * LONGITUDE: 39.167333 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C3_T3 * LATITUDE: -6.117881 * LONGITUDE: 39.167354 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C4_T3 * LATITUDE: -6.117920 * LONGITUDE: 39.167354 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C5_T3 * LATITUDE: -6.117941 * LONGITUDE: 39.167335 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C6_T3 * LATITUDE: -6.117963 * LONGITUDE: 39.167361 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C7_T3 * LATITUDE: -6.117962 * LONGITUDE: 39.167392 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C8_T3 * LATITUDE: -6.117930 * LONGITUDE: 39.167413 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C9_T3 * LATITUDE: -6.117969 * LONGITUDE: 39.167436 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C10_T3 * LATITUDE: -6.117956 * LONGITUDE: 39.167464 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C11_T3 * LATITUDE: -6.117994 * LONGITUDE: 39.167486 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C12_T3 * LATITUDE: -6.117968 * LONGITUDE: 39.167502 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C13_T3 * LATITUDE: -6.117928 * LONGITUDE: 39.167509 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C14_T3 * LATITUDE: -6.117896 * LONGITUDE: 39.167498 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C15_T3 * LATITUDE: -6.117910 * LONGITUDE: 39.167280 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C16_T3 * LATITUDE: -6.117983 * LONGITUDE: 39.167312 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C17_T3 * LATITUDE: -6.117999 * LONGITUDE: 39.167331 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C18_T3 * LATITUDE: -6.118008 * LONGITUDE: 39.167374 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C19_T3 * LATITUDE: -6.118007 * LONGITUDE: 39.167401 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C20_T3 * LATITUDE: -6.118043 * LONGITUDE: 39.167417 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C21_T3 * LATITUDE: -6.118067 * LONGITUDE: 39.167403 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C22_T3 * LATITUDE: -6.118093 * LONGITUDE: 39.167405 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C23_T3 * LATITUDE: -6.118093 * LONGITUDE: 39.167447 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 EVENT LABEL: Changuu_C24_T3 * LATITUDE: -6.118047 * LONGITUDE: 39.167473 * DATE/TIME: 2017-09-19T00:00:00 * METHOD/DEVICE: Sampling by hand 2017-09-19T00:00:00 Related to 2026-01-01 publication https://doi.pangaea.de/10.1594/PANGAEA.992558 Moreira-Saporiti, Agustín

am.saporiti@gmail.com

https://orcid.org/0000-0002-4798-3775 information author Teichberg, Mirta

mteichberg@mbl.edu

https://orcid.org/0000-0003-1586-738X information author O'Sullivan, Aoife

aoifeosullivan42@gmail.com

author documentDigital