Seasonal nitrogen and phosphorus dynamics during benthic clam and suspended mussel cultivation |
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Authors: | Nizzoli Daniele Welsh David Thomas Viaroli Pierluigi |
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Affiliation: | a Department of Environmental Sciences, Parma University, Parco Area delle Scienze 33/A, 43100 Parma, Italy b School of Environment and Environmental Futures Centre, Griffith University, Gold Coast Campus, PMB 50 GC Mail Centre, Bundall, 9726 Qld, Australia |
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Abstract: | Effects of suspended mussel and infaunal clam cultivation on sediment characteristics, and benthic organic and inorganic nitrogen and phosphorus fluxes were compared in a shallow coastal lagoon. The two species had different impacts on sediment features, but both created “hotspots” of nutrient fluxes with annual N and P regeneration rates being 4.9 and 13.5 (mussel) and 4.5 and 14.9 (clams) fold greater than those of unfarmed control sediments. Mussel farming also caused considerable nutrient regeneration within the water column with the mussel ropes contributing ∼25% of total inorganic N and P production and at times dominating the sediments (e.g. 95% of SRP production in summer and 45% of DIN production in winter). Such nutrient regeneration rates seriously question the proposal that suspension-feeding bivalves act as a eutrophication buffer, especially during summer when nutrient regeneration rates are maximal, but other nutrient sources (freshwater run-off and unfarmed sediments) are at their lowest. |
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Keywords: | Ruditapes philippinarum Mytilus galloprovincialis Nitrogen Phosphorous Coastal lagoon Eutrophication |
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