Publication Date:
2024-05-10
Description:
Arctic marine ecosystems are experiencing rapid environmental changes with respect to warming, ice melt, and terrestrial run-off. The effects of these perturbations can act as multi-stressors where warming sea seawater, in combination with freshening from ice melt, and increased turbidity from terrestrial run-off affect benthic community structure and function. To examine the effects of warming, freshening, and turbidity on habitat forming macroalgae, we conducted a 2-month long ex situ experiment on mixed Arctic kelp communities in Ny-Ålesund, Svalbard from 03/07/2021 - 26/08/2021. Three experimental conditions (with 3x replicates) were tested against a dynamic real-time control where temperature was increased by + 3.3 and + 5.3 °C, salinity was reduced by ~ 4 and ~ 5, and irradiance was statically attenuated by ~ 25 and 40 % in 2 treatments. The third treatment was only warmed by + 5.3 °C from the control. In each 1 m³ mesocosm, oxygen (% O2), temperature, salinity, and photosynthetically active radiation (PAR) were continuously monitored. Mixed kelp communities comprised a biomass of ~ 4 kg fw (fresh weight) and ~ 500 g fw of small fauna. Weekly incubations were performed to calculate net community productivity (NCP) and used to estimate kelp benthic metabolism. We determined non-significant differences across treatments and provide NCP rates for mixed kelp communities in the Arctic.
Keywords:
Analysis date/time, experiment; Arctic Biodiversity & Livelihoods; Climate change; Conductivity digital sensor, Aqualabo, PC4E; ecosystems; Experiment; FACE-IT; Incubation duration; kelp; MESO; Mesocosm experiment; multi-stressors; Net community production; Ny_Ålesund_Mesocosm_2021; Ny-Ålesund, Spitsbergen; Oxygen; Oxygen Optical digital sensor, Aqualabo, PODOC; Photosynthetic Active Radiation Logger (PAR), Odyssey®; Radiation, photosynthetically active per minute; Replicates; Treatment; Treatment: salinity; Treatment: temperature
Type:
Dataset
Format:
text/tab-separated-values, 218787 data points
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