Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 GEOMAR - Helmholtz Centre for Ocean Research Kiel GEOMAR http://www.geomar.de https://ror.org/02h2x0161 Teichberg Mirta mteichberg@mbl.edu 0000-0003-1586-738X MARINE BIOLOGICAL LABORATORY https://ror.org/046dg4z72 O'Sullivan Aoife aoifeosullivan42@gmail.com Marine Institute https://ror.org/05581wm82 2026 Photosynthetically active radiation (PAR) in Changuu Island, Zanzibar Archipelago, Tanzania dataset https://doi.org/10.1594/PANGAEA.986944 2026-04-08T07:57:27 Photosynthetic active radiation (PAR) was measured during a nutrient enrichment and exclusion field experiment on seagrass. 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). Data was collected between July 19th and September 20th of 2017 in four sampling times (Day 0 (19.07.2017), Day 20 (09.08.2017), Day 38 (31.08.2017) and Day 63 (19.09.2017)). Data collection took place in Changuu Island (Zanzibar Archipelago, Tanzania) in the area that the experiment took place, and not per experimental plot. Changuu Island is located 3 km from Stone Town, Zanzibar's busiest town. The study area is characterised by a fringing reef around a multi-specific seagrass ecosystem. The substrate is primarily carbonate sediment. PAR and the calculation of the attenuation coefficient were collected at each sampling time to account for potential confounding variables during the experiment. Photosynthetically active radiation (PAR) was measured every 2 hours at each sampling time using a LiCor-1500 with a PAR sensor. The PAR sensor (μmol photons m−2 s−1) was placed at the water surface and approximately half a meter underwater. The light attenuation coefficient was calculated using the Bouguer-Lambert's law, which follows the equation: I(z)=I0 e -µz, where z is the depth in meters, I(z) is the PAR intensity at a depth z, I0 is the PAR intensity at the water surface and µ is the light attenuation coefficient. Casini Michele Lövgren Johan Hjelm Joakim Cardinale Massimiliano Molinero Juan-Carlos Kornilovs Georgs 2008 Multi-level trophic cascades in a heavily exploited open marine ecosystem journal article Proceedings of the Royal Society B-Biological Sciences 275(1644) https://doi.org/10.1098/rspb.2007.1752 1793-1801 Heck Kenneth L Pennock Jonathan R Valentine John F Coen Loren D Sklenar Susan A 2000 Effects of nutrient enrichment and small predator density on seagrass ecosystems: An experimental assessment journal article Limnology and Oceanography 45(5) https://doi.org/10.4319/lo.2000.45.5.1041 1041-1057 Lotze Heike K 0000-0001-6258-1304 Worm Boris 0000-0002-5742-8716 2000 Variable and complementary effects of herbivores on different life stages of bloom-forming macroalgae journal article Marine Ecology Progress Series 200 https://doi.org/10.3354/meps200167 167-175 39.167289999999994 39.167289999999994 -6.11788 -6.11788 39.167289999999994 -6.11788 2017-07-19T11:49:00 2017-09-19T13:30:00 0.3 0.6 SEAMAC Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change https://www.leibniz-zmt.de/en/research/research-projects/seamac.html Leibniz Centre for Tropical Marine Research, Bremen, Germany ZMT https://leibniz-zmt.de/ https://ror.org/019w00969 SEATRAIT Seagrass Ecosystem Service Evaluation using a Trait-based Approach https://www.leibniz-zmt.de/en/research/research-projects/seatrait.html Leibniz Centre for Tropical Marine Research, Bremen, Germany ZMT https://leibniz-zmt.de/ https://ror.org/019w00969 German Research Foundation DFG http://www.dfg.de/en/ https://doi.org/10.13039/501100001659 278616556 SEAMAC - Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change https://gepris.dfg.de/project/278616556 Changuu_C1_T0_1 T0_1 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-07-19T11:49:00 Field experiment Changuu_C1_T0_2 T0_2 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-07-19T13:57:00 Field experiment Changuu_C1_T0_3 T0_3 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-07-19T14:30:00 Field experiment Changuu_C1_T1_1 T1_1 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-09T08:16:00 Field experiment Changuu_C1_T1_2 T1_2 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-09T09:16:00 Field experiment Changuu_C1_T1_3 T1_3 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-09T11:16:00 Field experiment Changuu_C1_T1_4 T1_4 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-09T12:56:00 Field experiment Changuu_C1_T1_5 T1_5 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-09T13:56:00 Field experiment Changuu_C1_T2_1 T2_1 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-31T09:22:00 Field experiment Changuu_C1_T2_2 T2_2 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-31T09:05:00 Field experiment Changuu_C1_T2_3 T2_3 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-31T10:40:00 Field experiment Changuu_C1_T2_4 T2_4 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-31T11:32:00 Field experiment Changuu_C1_T2_5 T2_5 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-08-31T12:25:00 Field experiment Changuu_C1_T3_1 T3_1 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-09-19T07:45:00 Field experiment Changuu_C1_T3_2 T3_2 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-09-19T09:07:00 Field experiment Changuu_C1_T3_3 T3_3 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-09-19T10:20:00 Field experiment Changuu_C1_T3_4 T3_4 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-09-19T12:28:00 Field experiment Changuu_C1_T3_5 T3_5 -6.11788 39.16729 Changuu Island, Zanzibar Archipelago, Tanzania 2017-09-19T13:30:00 Field experiment 126 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Event label Event Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Event Type of study Study type type Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Study type Sampling date Sampling date Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Sampling date Time in days Time d days Time T http://dbpedia.org/resource/Time Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Days since start of experiment Time d [days] (Days since start of experiment) LATITUDE Latitude http://en.wikipedia.org/wiki/ISO_6709 Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Latitude LONGITUDE Longitude http://en.wikipedia.org/wiki/ISO_6709 Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Longitude Site Site site Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Site Radiation, photosynthetically active PAR µmol/m**2/s https://en.wikipedia.org/wiki/Photosynthetically_active_radiation Molar Flux PAR sensor LI-1500, Li-COR Inc. Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Surface PAR [µmol/m**2/s] (Surface, PAR sensor LI-1500, ...) Radiation, photosynthetically active PAR µmol/m**2/s https://en.wikipedia.org/wiki/Photosynthetically_active_radiation Molar Flux PAR sensor LI-1500, Li-COR Inc. Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Botttom PAR [µmol/m**2/s] (Botttom, PAR sensor LI-1500, ...) DEPTH, water Depth water m depth http://purl.obolibrary.org/obo/PATO_0001595 water http://purl.obolibrary.org/obo/CHEBI_15377 Length L http://dbpedia.org/resource/Length Ruler tape Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 Depth water [m] (Ruler tape) Attenuation coefficient AC 1/m attenuation coefficient https://en.wikipedia.org/wiki/Attenuation_coefficient Absorption Coefficient Moreira-Saporiti Agustín am.saporiti@gmail.com 0000-0002-4798-3775 AC [1/m] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable attenuation coefficient Indian Ocean PAR photosynthetically active radiation Seagrass seawater Tropical ZMT author112185 author112186 author112187 author112188 author112189 author112191 author112192 author112193 author32904 author33596 author53312 author61014 author74039 author80514 author80943 author82460 award528 curlevel30 event3329262 event3329263 event3329264 event3329265 event3329266 event3329267 event3329268 event3329269 event3329270 event3329271 event3329272 event3329273 event3329274 event3329275 event3329276 event3329277 event3329278 event3329279 funder20472 geocode1599 geocode1600 geocode1601 geocode1619 inst11138 inst20147 inst22271 inst46 journal10608 journal10811 journal13305 license21 method12831 method14370 method5024 param181688 param185520 param48491 param4875 param8137 param87725 pi82460 project4573 project5052 ref134746 ref134747 ref134750 term1073131 term2606205 term37810 term38578 term38856 term38868 term40415 term43863 term43975 term44005 term44029 term44039 term47460 term49506 term52877 term60590 term67521 term70318