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Biogeochemistry

pp 1–13

First Online: 12 June 2017Received: 31 October 2016Accepted: 07 June 2017DOI: 10.1007-s10533-017-0350-9

Cite this article as: Hale, R., Godbold, J.A., Sciberras, M. et al. Biogeochemistry 2017. doi:10.1007-s10533-017-0350-9

Abstract

Benthic communities play a major role in organic matter remineralisation and the mediation of many aspects of shelf sea biogeochemistry. Few studies have considered how changes in community structure associated with different levels of physical disturbance affect sediment macronutrients and carbon following the cessation of disturbance. Here, we investigate how faunal activity sediment particle reworking and bioirrigation in communities that have survived contrasting levels of bottom fishing affect sediment organic carbon content and macronutrient concentrations NH4–N, NO2–N, NO3–N, PO4–P, SiO4–Si. We find that organic carbon content and NO3–N decline in cohesive sediment communities that have experienced an increased frequency of fishing, whilst NH4–N, NO2–N, PO4–P and SiO4–Si are not affected. NH4–N increases in non-cohesive sediments that have experienced a higher frequency of fishing. Further analyses reveal that the way communities are restructured by physical disturbance differs between sediment type and with fishing frequency, but that changes in community structure do little to affect bioturbation and associated levels of organic carbon and nutrient concentrations. Our results suggest that in the presence of physical disturbance, irrespective of sediment type, the mediation of macronutrient and carbon cycling increasingly reflects the decoupling of organism-sediment relations. Indeed, it is the traits of the species that reside at the sediment–water interface, or that occupy deeper parts of the sediment profile, that are disproportionately expressed post-disturbance, that are most important for sustaining biogeochemical functioning.

KeywordsBioturbation Biodiversity Ecosystem function Nitrogen Biogeochemical cycles Recovery Electronic supplementary materialThe online version of this article doi:10.1007-s10533-017-0350-9 contains supplementary material, which is available to authorized users.

Responsible Editor: Leila J. Hamdan.





Autor: Rachel Hale - Jasmin A. Godbold - Marija Sciberras - Jessica Dwight - Christina Wood - Jan G. Hiddink - Martin Solan

Fuente: https://link.springer.com/



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