PANGAEA_986944 Photosynthetically active radiation (PAR) in Changuu Island, Zanzibar Archipelago, Tanzania Moreira-Saporiti, Agustín; Teichberg, Mirta; O'Sullivan, Aoife Photosynthetically active radiation (PAR) in Changuu Island, Zanzibar Archipelago, Tanzania 2026-04-08 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.986944 Investigator Agustín Moreira-Saporiti am.saporiti@gmail.com Earth Science Event label Type of study Sampling date Time in days LATITUDE LONGITUDE Site Radiation, photosynthetically active DEPTH, water Attenuation coefficient geoscientificInformation attenuation coefficient Changuu_C1_T0_1 Changuu_C1_T0_2 Changuu_C1_T0_3 Changuu_C1_T1_1 Changuu_C1_T1_2 Changuu_C1_T1_3 Changuu_C1_T1_4 Changuu_C1_T1_5 Changuu_C1_T2_1 Changuu_C1_T2_2 Changuu_C1_T2_3 Changuu_C1_T2_4 Changuu_C1_T2_5 Changuu_C1_T3_1 Changuu_C1_T3_2 Changuu_C1_T3_3 Changuu_C1_T3_4 Changuu_C1_T3_5 Field experiment Indian Ocean PAR photosynthetically active radiation Seagrass seawater T0_1 T0_2 T0_3 T1_1 T1_2 T1_3 T1_4 T1_5 T2_1 T2_2 T2_3 T2_4 T2_5 T3_1 T3_2 T3_3 T3_4 T3_5 Tropical PAR sensor LI-1500, Li-COR Inc. Ruler tape 2017-07-19 2017-09-19 Complete -6.11788 -6.11788 39.167289999999994 39.167289999999994 0.3 m (DEPTH, water) 0.6 m (DEPTH, water) SEAMAC Seagrass and Macroalgal Community Dynamics and Performance under Environmental Change SEATRAIT Seagrass Ecosystem Service Evaluation using a Trait-based Approach unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 126 data points text/tab-separated-values 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. Proceedings of the Royal Society B-Biological Sciences, 275(1644), 1793-1801, https://doi.org/10.1098/rspb.2007.1752 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. Limnology and Oceanography, 45(5), 1041-1057, https://doi.org/10.4319/lo.2000.45.5.1041 Lotze, Heike K; Worm, Boris (2000): Variable and complementary effects of herbivores on different life stages of bloom-forming macroalgae. Marine Ecology Progress Series, 200, 167-175, https://doi.org/10.3354/meps200167

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.986944"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE https://doi.org/10.1098/rspb.2007.1752 Multi-level trophic cascades in a heavily exploited open marine ecosystem https://doi.org/10.3354/meps200167 Variable and complementary effects of herbivores on different life stages of bloom-forming macroalgae https://doi.org/10.4319/lo.2000.45.5.1041 Effects of nutrient enrichment and small predator density on seagrass ecosystems: An experimental assessment https://en.wikipedia.org/wiki/Photosynthetically_active_radiation Radiation, photosynthetically active https://www.leibniz-zmt.de/en/research/research-projects/seamac.html SEAMAC https://www.leibniz-zmt.de/en/research/research-projects/seatrait.html SEATRAIT DIF 9.4 2026-04-08 2026-07-15