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Open AccessArticle

Estuarine Macrofauna Affects Benthic Biogeochemistry in a Hypertrophic Lagoon

1
Marine Research Institute, Klaipeda University, 92294 Klaipėda, Lithuania
2
Department of Life Science and Biotechnology, Ferrara University, 44121 Ferrara, Italy
3
Department of Chemistry, Life science and Environmental Sustainability, Parma University, 43124 Parma, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(6), 1186; https://doi.org/10.3390/w11061186
Received: 24 April 2019 / Revised: 3 June 2019 / Accepted: 4 June 2019 / Published: 7 June 2019
(This article belongs to the Special Issue The Role of Macrobiota in Aquatic Nutrient Cycling)
Coastal lagoons display a wide range of physico-chemical conditions that shape benthic macrofauna communities. In turn, benthic macrofauna affects a wide array of biogeochemical processes as a consequence of feeding, bioirrigation, ventilation, and excretion activities. In this work, we have measured benthic respiration and solute fluxes in intact sediment cores with natural macrofauna communities collected from four distinct areas within the Sacca di Goro Lagoon (NE Adriatic Sea). The macrofauna community was characterized at the end of the incubations. Redundancy analysis (RDA) was used to quantify and test the interactions between the dominant macrofauna species and solute fluxes. Moreover, the relevance of macrofauna as driver of benthic nitrogen (N) redundancy analysis revealed that up to 66% of the benthic fluxes and metabolism variance was explained by macrofauna microbial-mediated N processes. Nitrification was stimulated by the presence of shallow (corophiids) in combination with deep burrowers (spionids, oligochaetes) or ammonium-excreting clams. Deep burrowers and clams increase ammonium availability in burrows actively ventilated by corophiids, which creates optimal conditions to nitrifiers. However, the stimulatory effect of burrowing macrofauna on nitrification does not necessarily result in higher denitrification as processes are spatially separated. View Full-Text
Keywords: fluxes; denitrification; macrofauna; functional diversity; Sacca di Goro Lagoon fluxes; denitrification; macrofauna; functional diversity; Sacca di Goro Lagoon
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Politi, T.; Zilius, M.; Castaldelli, G.; Bartoli, M.; Daunys, D. Estuarine Macrofauna Affects Benthic Biogeochemistry in a Hypertrophic Lagoon. Water 2019, 11, 1186.

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