Abstract
Although Arctic communities are very sensitive to global warming, direct evidence of the effects of high temperature on bottom communities is quite rare. We observed a mass mortality event (MME) of sponges by SCUBA diving in July and August 2018 along the coasts of Kandalaksha Bay, White Sea, and sub-Arctic. This event severely affected sponges from hard-substratum communities in particular, the demosponges Isodyctia palmata and Halichondria sitiens. Constant and exceptionally high temperatures throughout the water column (average temperature differences of 6.5 °C in July and 5.6 °C in August 2018, relative to the average temperatures in previous years at a depth of 20 m) may have led to an environmental context favorable to the MME. As was observed for the thermal anomaly, mortality was limited at the depth below a thermocline. However, it is not possible to ascertain whether temperature had a direct effect on organisms or whether it acted in synergy with a latent and/or waterborne agent. However, viewed in the context of global warming, there is an urgent need to rapidly set up monitoring programs of physical–chemical parameters and vulnerable populations in benthic communities through the Arctic Basin.
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Acknowledgements
This work was supported by grants of A*MIDEX, Grant/Award Number: ANR-11-LABX-0061; Excellence Initiative of Aix-Marseille University—A*MIDEX, Grant RFBR 18-05-60158, and Grant PRC CNRS/RFBR n° 1077. We thank the White Sea Biological Station of the Russian Academy of Sciences "Kartesh" for providing materials on the long-term monitoring of hydrology in the White Sea from program “White Sea Hydrology and Zooplankton Time Series: Kartesh D1.”
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300_2019_2606_MOESM1_ESM.tif
Supplementary file1 (TIFF 8543 kb). EMS 1. Map of the investigated site in Kandalaksha Bay of the White Sea. In red: the transects.
300_2019_2606_MOESM2_ESM.tif
Supplementary file2 (TIFF 510 kb). EMS 2. Temperature in the Velikaya Salma Strait: (a) –monthly averages temperature of the period from 2005 to 2016 (http://wsbs-msu.ru/doc/view.php?ID=23); (b) – temperature in the summer of 2018.
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Ereskovsky, A., Ozerov, D.A., Pantyulin, A.N. et al. Mass mortality event of White Sea sponges as the result of high temperature in summer 2018. Polar Biol 42, 2313–2318 (2019). https://doi.org/10.1007/s00300-019-02606-0
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DOI: https://doi.org/10.1007/s00300-019-02606-0