, Volume 819, Issue 1, pp 217–230 | Cite as

Nitrification and denitrification in estuarine sediments with tube-dwelling benthic animals

  • Paula Carpintero Moraes
  • Mindaugas Zilius
  • Sara Benelli
  • Marco BartoliEmail author
Primary Research Paper


Burrowing benthic animals belonging to the same functional group may produce species-specific effects on microbially mediated nitrogen (N) processes depending upon different ecological traits. We investigated the effects of two tube-dwelling organisms, amphipods (Corophium insidiosum) and chironomid larvae (Chironomus plumosus), on benthic N cycling in bioturbated estuarine sediments. Aims of this work were to analyze the interactions among burrowers and N-related microbial processes in two distinct sedimentary environments colonized by benthic animals with different ecological traits. We hypothesized higher rates of nitrification and higher coupled nitrification–denitrification in sediments with C. insidiosum due to continuous ventilation rates. We expected higher denitrification of water column nitrate in sediments with C. plumosus due to lower and intermittent ventilation activity and lower oxygen levels in burrows. To this purpose, we combined process–specific (nitrification and denitrification) with net N flux measurements in intact and reconstructed sediments. Sediments with C. insidiosum had higher rates of oxygen demand and of potential nitrification and higher concentration of pore water NH4+ as compared to sediments with C. plumosus. Sediments with both species displayed comparable net N2 fluxes, mostly sustained by respiration of water column NO3 in sediments with chironomid larvae and by NO3 produced within sediments in sediments with corophiid amphipods. Corophium insidiosum stimulated nitrification nearly 15-fold more as compared to C. plumosus. Overall, our results demonstrate that sediments with burrowing fauna may display similar rates of denitrification, but underlying mechanisms may deeply vary and be species-specific.


Bioturbation Corophium insidiosum Chironomus plumosus Nitrification Denitrification Benthic flux 



Paula Carpintero Moraes was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq-Brasil). Mindaugas Zilius and Marco Bartoli were partly supported by the BONUS project “Nutrient Cocktails in Coastal zones of the Baltic Sea (COCOA)” (No. BONUS-2/2014). We kindly acknowledge Irma Vybernaite-Lubiene and Tomas Ruginis for assistance in laboratory analysis.


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemistry, Life Science and Environmental SustainabilityUniversity of ParmaParmaItaly
  2. 2.Marine Research InstituteKlaipeda UniversityKlaipedaLithuania
  3. 3.Department of Life Sciences and BiotechnologyUniversity of FerraraFerraraItaly

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