Sponge contribution to the silicon cycle of a diatom‐rich shallow bay
Type | Article | ||||||||||||
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Date | 2022-11 | ||||||||||||
Language | English | ||||||||||||
Author(s) | López‐acosta María1, 2, Maldonado Manuel3, Grall Jacques4, Ehrhold Axel5, Sitjà Cèlia3, Galobart Cristina3, Pérez Fiz F.1, Leynaert Aude2 | ||||||||||||
Affiliation(s) | 1 : Instituto de Investigaciones Marinas (IIM), CSIC Vigo, Spain 2 : Laboratoire des Sciences de l'Environnement Marin, UMR 6539, Institut Universitaire Européen de la Mer Plouzané , France 3 : Centro de Estudios Avanzados de Blanes (CEAB), CSIC Girona , Spain 4 : Observatoire des Sciences de l'Univers, UMS 3113, Institut Universitaire Européen de la Mer Plouzané , France 5 : IFREMER, Géosciences Marines, Centre de Brest Plouzané , France |
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Source | Limnology And Oceanography (0024-3590) (Wiley), 2022-11 , Vol. 67 , N. 11 , P. 2431-2447 | ||||||||||||
DOI | 10.1002/lno.12211 | ||||||||||||
WOS© Times Cited | 2 | ||||||||||||
Abstract | In coastal systems, planktonic and benthic silicifiers compete for the pool of dissolved silicon, a nutrient required to make their skeletons. The contribution of planktonic diatoms to the silicon cycle in coastal systems is often well characterized, while that of benthic silicifiers such as sponges has rarely been quantified. Herein, silicon fluxes and stocks are quantified for the sponge fauna in the benthic communities of the Bay of Brest (France). A total of 45 siliceous sponge species living in the Bay account for a silicon standing stock of 1215 tons, while that of diatoms is only 27 tons. The silicon reservoir accumulated as sponge skeletons in the surface sediments of the Bay rises to 1775 tons, while that of diatom skeletons is only 248 tons. These comparatively large stocks of sponge silicon were estimated to cycle two orders of magnitude slower than the diatom stocks. Sponge silicon stocks need years to decades to be renewed, while diatom turnover lasts only days. Although the sponge monitoring over the last 6 yr indicates no major changes of the sponge stocks, our results do not allow us to conclude if the silicon sponge budget of the Bay is at steady state, and potential scenarios are discussed. The findings buttress the idea that sponges and diatoms play contrasting roles in the marine silicon cycle. The budgets of these two major silicon users need to be integrated and their connections revealed, if we aim to improve our understanding of the silicon cycling in coastal ecosystems. |
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