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Communication

Contrasting Effects of Bioturbation Studied in Intact and Reconstructed Estuarine Sediments

1
Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 4314 Parma, Italy
2
Marine Research Institute, University of Klaipeda, 92294 Klaipeda, Lithuania
3
Bordeaux INP, University Bordeaux Montaigne, 33600 Bordeaux, France
4
Laboratory of Biogeochemistry of Nutrients, Micronutrients and Traces in Oceans—Oceanographic Institute, São Paulo University, São Paulo 05508-120, Brazil
5
Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(11), 3125; https://doi.org/10.3390/w12113125
Received: 2 October 2020 / Revised: 1 November 2020 / Accepted: 3 November 2020 / Published: 7 November 2020
(This article belongs to the Special Issue The Role of Macrobiota in Aquatic Nutrient Cycling)
Macrofauna can produce contrasting biogeochemical effects in intact and reconstructed sediments. We measured benthic fluxes of oxygen, inorganic carbon, and nitrogen and denitrification rates in intact sediments dominated by a filter and a deposit feeder and in reconstructed sediments added with increasing densities of the same organisms. Measurements in reconstructed sediments were carried out 5 days after macrofauna addition. The degree of stimulation of the measured fluxes in the intact and reconstructed sediments was then compared. Results confirmed that high densities of bioturbating macrofauna produce profound effects on sediment biogeochemistry, enhancing benthic respiration and ammonium recycling by up to a factor of ~3 and ~9, respectively, as compared to control sediments. The deposit feeder also increased total denitrification by a factor of ~2, whereas the filter feeder activity did not stimulate nitrogen removal. Moreover, the effects of deposit feeders on benthic fluxes were significantly higher (e.g., on respiration and ammonium recycling) or different (e.g., on denitrification) when measured in intact and reconstructed sediments. In intact sediments, deposit feeders enhanced the denitrification coupled to nitrification and had no effects on the denitrification of water column nitrate, whereas in reconstructed sediments, the opposite was true. This may reflect active burrowing in reconstructed sediments and the long time needed for slow growing nitrifiers to develop within burrows. Results suggest that, in bioturbation studies, oversimplified experimental approaches and insufficient preincubation time might lead to wrong interpretation of the role of macrofauna in sediment biogeochemistry, far from that occurring in nature. View Full-Text
Keywords: benthic fluxes; denitrification; bioturbation; Ruditapes philippinarum; Alitta succinea benthic fluxes; denitrification; bioturbation; Ruditapes philippinarum; Alitta succinea
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MDPI and ACS Style

Bartoli, M.; Benelli, S.; Magri, M.; Ribaudo, C.; Moraes, P.C.; Castaldelli, G. Contrasting Effects of Bioturbation Studied in Intact and Reconstructed Estuarine Sediments. Water 2020, 12, 3125. https://doi.org/10.3390/w12113125

AMA Style

Bartoli M, Benelli S, Magri M, Ribaudo C, Moraes PC, Castaldelli G. Contrasting Effects of Bioturbation Studied in Intact and Reconstructed Estuarine Sediments. Water. 2020; 12(11):3125. https://doi.org/10.3390/w12113125

Chicago/Turabian Style

Bartoli, Marco; Benelli, Sara; Magri, Monia; Ribaudo, Cristina; Moraes, Paula C.; Castaldelli, Giuseppe. 2020. "Contrasting Effects of Bioturbation Studied in Intact and Reconstructed Estuarine Sediments" Water 12, no. 11: 3125. https://doi.org/10.3390/w12113125

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