Variation in benthic metabolism and nitrogen cycling across clam aquaculture sites

Murphy, Anna E.; Nizzoli, Daniele; Bartoli, Marco; Smyth, Ashley R.; Castaldelli, Giuseppe; Anderson, Iris C.

doi:10.1016/j.marpolbul.2017.12.003

Cited by 19 publications

(7 citation statements)

References 31 publications

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“…Heterotrophic measurements of nutrient fluxes reported in Figure are always much lower than those expected from mussel excretion, suggesting different retention mechanisms, operating also in the dark and including precipitation and co‐precipitation, coupled nitrification and denitrification and uptake. Large differences between nutrient recycling via excretion measured with mussels alone and net nutrient regeneration in intact cores with mussels were generally found (Benelli et al., ; Murphy et al., ; Ruginis et al., ). Such differences can be due to higher mussel metabolism when incubated without sediments and to a diversified community of microbes and algae, which are growing in sediments with mussels and may promote net uptake of the excreted solutes.…”

Section: Discussionmentioning

confidence: 99%

“…Heterotrophic measurements of nutrient fluxes reported in Figure 3 are always much lower than those expected from mussel excretion, suggesting different retention mechanisms, operating also in the dark and including precipitation and co-precipitation, coupled nitrification and denitrification and uptake. Large differences between nutrient recycling via excretion measured with mussels alone and net nutrient regeneration in intact cores with mussels were generally found (Benelli et al, 2017;Murphy et al, 2018;Ruginis et al, 2017).…”

Section: Benthic Buffers Of Excreted Nutrientsmentioning

confidence: 99%

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Stoichiometry of regenerated nutrients differs between native and invasive freshwater mussels with implications for algal growth

et al. 2019

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Filter‐feeding mussels couple benthic and pelagic environments and create biogeochemical hot spots. Mussels may exert either top‐down control (via filtration) or bottom‐up stimulation (via biodeposition and excretion) of primary producers. Mussel metabolism may be species‐specific and the disappearance of native species or their replacement by invasive species may affect ecosystem functioning, notably gas exchange, nutrient fluxes, and stoichiometry at the sediment–water interface. In this study, we tested experimentally how native (unionids) and invasive (dreissenids) mussels, singly and in association, affect benthic fluxes of dissolved gas and nutrients in the light and in the dark, and indirectly phytoplankton growth from a freshwater estuary, the Curonian Lagoon, where the two species of mussel coexist. We show that native and invasive mussels stimulated O2 consumption and the production of total dissolved inorganic carbon and N2 increasing sediment heterotrophy and nutrient regeneration, with species‐specific effects on nutrient stoichiometry and algal growth. Ammonium and SiO2 exchanges were similar for both species, while soluble reactive phosphorus fluxes and excretion rates were significantly higher in sediments with dreissenids. Phytoplankton growth was also significantly higher in the presence of dreissenids as compared to unionids. Dreissenid mussels decreased the dissolved inorganic N to P ratio of regenerated nutrients and may favour the growth of cyanobacteria. Hence, the replacement of native with invasive mussels may produce large changes in benthic nutrient cycling and in phytoplankton growth and community composition.

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Section: Discussionmentioning

confidence: 99%

Section: Benthic Buffers Of Excreted Nutrientsmentioning

confidence: 99%

Stoichiometry of regenerated nutrients differs between native and invasive freshwater mussels with implications for algal growth

et al. 2019

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“…65 DNRA exceeded denitrification in highly reduced sediment, potentially owing to low hydrologic flow and high aquaculture densities. 66 In the eutrophic fish farming ground, bacterial production and DON were significantly higher and well correlated. 67 Hence, in Lake Zhiyin, with intensive aquaculture, high C and N input due to bait addition induced DOC accumulation and NH 4 + −N regeneration and retention, coupled with organic P hydrolysis, finally fueling algal and bacterial growth.…”

Section: Functional Genes and Microbial Community Structures Promoted...mentioning

confidence: 96%

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Wan

Cao

Song

et al. 2022

Environ. Sci. Technol.

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To explore the effect of different types of dissolved organic matter (DOM) decomposition on nutrient cycling pathways and the microbial loop, four lakes with different DOM sources were investigated monthly. In Lake Tangxun, Dolichospermum decay released highly labile dissolved organic nitrogen into the water column. This induced bacterial organic nitrogen decomposition, as indicated by the increased abundance of gltB, gltD, gdh, and glnA as well as aminopeptidase activity. Genes associated with dissimilatory nitrate reduction to ammonium further fueled ammonium accumulation, driving Microcystis blooms in the summer. In Lake Zhiyin, fish bait deposits (high nitrogen, similar to Dolichospermum detritus) also caused Microcystis blooms. Detritus from Microcystis decomposition then produced high levels of labile dissolved organic phosphorus, inducing phosphatase activity and increasing soluble reactive phosphorus concentrations from September to April in Lakes Tangxun and Zhiyin. The high refractory DOM from macrophytes in Lake Houguan led to insufficient nutrient availability, leading to nutrient mutualism between algae and bacteria. The high levels of labile dissolved organic carbon from terrestrial detritus in Lake Yandong increased bacterial biomass and production, resulting in low chlorophyll content due to the competitive relationship between algal and bacterial nutrient requirements. Therefore, different DOM compositions induce unique connections among available nutrients, algae, and bacteria in the microbial loop.

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“…High densities of filter-feeders produce changes in sediment physico-chemical characteristics, as organic enrichment that may favor the proliferation of small-sized tolerant macrofauna [66,67]. High clams density results also in large stimulation of O 2 and NH 4 + fluxes due to combination of respiration, labile particles mineralization, and direct excretion [29,46]. Site 4 is a sandy area exposed to tidal forcing and strong currents that prevent organic matter accumulation and restrict macrofauna distribution [68,69].…”

Section: Physico-chemical Zonation and Macrofauna Compositionmentioning

confidence: 99%

“…In estuarine systems, the understanding of the role of macrofauna communities on benthic N-cycling is a keystone, due to its large inputs from catchments and potentially large macrofauna-mediated microbial N losses [27][28][29][30][31]. It is well known that macrofauna actively contribute to the translocation and transformations of N within and among different compartments of aquatic ecosystems, stimulating microbial processes [32,33].…”

Section: Introductionmentioning

confidence: 99%

Estuarine Macrofauna Affects Benthic Biogeochemistry in a Hypertrophic Lagoon

Politi

Žilius

Castaldelli

et al. 2019

Water

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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. Author Contributions: Conceptualization, M.B., T.P.; methodology, M.B.; formal analysis, D.D., T.P.; investigation, D.D., M.B., M.Z.; resources, G.C.; data curation, T.P., D.D.; writing-original draft preparation, T.B.; writing-review and editing, D.D., G.C., M.B., M.Z.

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Variation in benthic metabolism and nitrogen cycling across clam aquaculture sites

Cited by 19 publications

References 31 publications

Stoichiometry of regenerated nutrients differs between native and invasive freshwater mussels with implications for algal growth

Stoichiometry of regenerated nutrients differs between native and invasive freshwater mussels with implications for algal growth

Regulation of the Nutrient Cycle Pathway and the Microbial Loop Structure by Different Types of Dissolved Organic Matter Decomposition in Lakes

Estuarine Macrofauna Affects Benthic Biogeochemistry in a Hypertrophic Lagoon

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