As bivalve aquaculture expands globally, an understanding of how it alters nitrogen is important to minimize impacts. This study investigated nitrogen cycling associated with clam aquaculture in the Sacca di Goro, Italy (Ruditapes philipinarum) and the Eastern Shore, USA (Mercenaria mercenaria). Ammonium and dissolved oxygen fluxes were positively correlated with clam biomass; R. philippinarum consumed ~ 6 times more oxygen and excreted ~ 5 times more NH4+than M. mercenaria. There was no direct effect of clams on denitrification or dissimilatory nitrate reduction to ammonium (DNRA); rather, nitrate availability controlled the competition between these microbial pathways. Highest denitrification rates were measured at sites where both water column nitrate and nitrification were elevated due to high densities of a burrowing amphipod (Corophium sp.). DNRA exceeded denitrification where water column nitrate was low and nitrification was suppressed in highly reduced sediment, potentially due to low hydrologic flow and high clam densities.

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.. - In: MARINE POLLUTION BULLETIN. - ISSN 0025-326X. - 127(2018), pp. 524-535. [10.1016/j.marpolbul.2017.12.003]

Variation in benthic metabolism and nitrogen cycling across clam aquaculture sites

Nizzoli, Daniele;Bartoli, Marco;
2018

Abstract

As bivalve aquaculture expands globally, an understanding of how it alters nitrogen is important to minimize impacts. This study investigated nitrogen cycling associated with clam aquaculture in the Sacca di Goro, Italy (Ruditapes philipinarum) and the Eastern Shore, USA (Mercenaria mercenaria). Ammonium and dissolved oxygen fluxes were positively correlated with clam biomass; R. philippinarum consumed ~ 6 times more oxygen and excreted ~ 5 times more NH4+than M. mercenaria. There was no direct effect of clams on denitrification or dissimilatory nitrate reduction to ammonium (DNRA); rather, nitrate availability controlled the competition between these microbial pathways. Highest denitrification rates were measured at sites where both water column nitrate and nitrification were elevated due to high densities of a burrowing amphipod (Corophium sp.). DNRA exceeded denitrification where water column nitrate was low and nitrification was suppressed in highly reduced sediment, potentially due to low hydrologic flow and high clam densities.
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.. - In: MARINE POLLUTION BULLETIN. - ISSN 0025-326X. - 127(2018), pp. 524-535. [10.1016/j.marpolbul.2017.12.003]
File in questo prodotto:
File Dimensione Formato  
Murphy et al., 2017 MPB - post print.pdf

accesso aperto

Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 1.33 MB
Formato Adobe PDF
1.33 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2837984
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 12
social impact