Statistical modelling of variability in sediment-water nutrient and oxygen fluxes

Natalia Serpetti, Ursula F. Witte, Michael R. Heath

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Mineralisation of organic detritus in the marine surficial sediments generates a flux of dissolved inorganic nutrient between the sediment and overlying water column. This is a key process in the marine ecosystem, which links the food webs of the sea-floor and the overlying water-column, which is potentially affected by a range of interacting environmental and sedimentary factors. Here, we use General Additive Models (GAM) to statistically disentangle some of the factors controlling the seasonal and spatial variability in carbon, nitrogen, phosphorus, silicon and oxygen fluxes in a field dataset collected in the North Sea off the northeast coast of Scotland. We show that sediment grain size, turbidity due to sediment re-suspension, temperature, and sediment chlorophyll content were the key factors affecting oxygen, ammonia and silicate fluxes. However, phosphate fluxes were only related to suspended sediment concentrations, whilst nitrate fluxes showed no clear relationship to any of the expected drivers of change, probably due to the effects of denitrification. Our analyses show that the stoichiometry of nutrient regeneration in the ecosystem is not necessarily constant and may be affected by combinations of processes.
LanguageEnglish
Article number65
Number of pages17
JournalFrontiers in Earth Science
Volume4
DOIs
Publication statusPublished - 8 Jun 2016

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Statistical Modeling
Sediment
Nutrients
Oxygen
Water
oxygen
nutrient
sediment
modeling
water column
Ecosystem
water
surficial sediment
stoichiometry
resuspension
marine ecosystem
Denitrification
suspended sediment
detritus
silicon

Keywords

  • biogeochemistry
  • marine ecology
  • statistical modelling
  • nutrients
  • organic matter

Cite this

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Statistical modelling of variability in sediment-water nutrient and oxygen fluxes. / Serpetti, Natalia; Witte, Ursula F.; Heath, Michael R.

In: Frontiers in Earth Science, Vol. 4, 65, 08.06.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Statistical modelling of variability in sediment-water nutrient and oxygen fluxes

AU - Serpetti, Natalia

AU - Witte, Ursula F.

AU - Heath, Michael R.

PY - 2016/6/8

Y1 - 2016/6/8

N2 - Mineralisation of organic detritus in the marine surficial sediments generates a flux of dissolved inorganic nutrient between the sediment and overlying water column. This is a key process in the marine ecosystem, which links the food webs of the sea-floor and the overlying water-column, which is potentially affected by a range of interacting environmental and sedimentary factors. Here, we use General Additive Models (GAM) to statistically disentangle some of the factors controlling the seasonal and spatial variability in carbon, nitrogen, phosphorus, silicon and oxygen fluxes in a field dataset collected in the North Sea off the northeast coast of Scotland. We show that sediment grain size, turbidity due to sediment re-suspension, temperature, and sediment chlorophyll content were the key factors affecting oxygen, ammonia and silicate fluxes. However, phosphate fluxes were only related to suspended sediment concentrations, whilst nitrate fluxes showed no clear relationship to any of the expected drivers of change, probably due to the effects of denitrification. Our analyses show that the stoichiometry of nutrient regeneration in the ecosystem is not necessarily constant and may be affected by combinations of processes.

AB - Mineralisation of organic detritus in the marine surficial sediments generates a flux of dissolved inorganic nutrient between the sediment and overlying water column. This is a key process in the marine ecosystem, which links the food webs of the sea-floor and the overlying water-column, which is potentially affected by a range of interacting environmental and sedimentary factors. Here, we use General Additive Models (GAM) to statistically disentangle some of the factors controlling the seasonal and spatial variability in carbon, nitrogen, phosphorus, silicon and oxygen fluxes in a field dataset collected in the North Sea off the northeast coast of Scotland. We show that sediment grain size, turbidity due to sediment re-suspension, temperature, and sediment chlorophyll content were the key factors affecting oxygen, ammonia and silicate fluxes. However, phosphate fluxes were only related to suspended sediment concentrations, whilst nitrate fluxes showed no clear relationship to any of the expected drivers of change, probably due to the effects of denitrification. Our analyses show that the stoichiometry of nutrient regeneration in the ecosystem is not necessarily constant and may be affected by combinations of processes.

KW - biogeochemistry

KW - marine ecology

KW - statistical modelling

KW - nutrients

KW - organic matter

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DO - 10.3389/feart.2016.00065

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JO - Frontiers in Earth Science

T2 - Frontiers in Earth Science

JF - Frontiers in Earth Science

SN - 2296-6463

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