Response of Arctic mixed kelp communities in northern Norway to simulated heatwaves: a mesocosm study as per minute record ...

• Main Authors: Miller, Cale A, Gazeau, Frédéric, Lebrun, Anaïs, Gattuso, Jean-Pierre, Alliouane, Samir, Urrutti, Pierre, Schlegel, Robert, Comeau, Steeve
• Format: Dataset
• Language: unknown
• Published: PANGAEA 2024
• Subjects: Climate change; ecosystems; kelp; marine heatwaves MHWs; Net community production; Experiment; Analysis date/time, experiment; Treatment; Replicates; Incubation duration; Oxygen; Treatment temperature; Treatment salinity; Radiation, photosynthetically active; Mesocosm experiment; Oxygen Optical digital sensor, Aqualabo, PODOC; Conductivity digital sensor, Aqualabo, PC4E; Photosynthetic Active Radiation Logger PAR, Odyssey®; Arctic Biodiversity & Livelihoods FACE-IT; Arctic biodiversity; Northern Norway; Tromsø
• Online Access: https://dx.doi.org/10.1594/pangaea.967060; https://doi.pangaea.de/10.1594/PANGAEA.967060

Arctic marine ecosystems are experiencing rapid environmental change with respect to warming. This is leading to an increased frequency, duration, and intensity of marine heatwaves. The impact of these stochastic heatwave events have the potential to negatively effect temperature-sensitive, habitat forming, kelp, that exist in the lower Arctic region. We tested the potential impacts of two heatwave events on mixed kelp communities occurring in the lower Arctic by conducting a 1-month ex situ mesocosm experiment in Tromsø, Norway. Each mesocosm was stocked with ~ 2.5 kg fw (fresh weight) of kelp, 200 g fw of snails and mussels, and ~ 750 g of sea urchins. Three experimental conditions were tested: a constant high temperature which was + 1.76°C above a dynamic control, and two heatwave scenarios. Scenario 1 was a long duration at + 2.8°C above the control for 2 weeks, and scenario 2 was a high frequency and magnitude treatment with conditions + 3.8°C above the control. This occurred at two peaks that were one ...