Comparing physical and biological impacts on seston renewal in a tidal bay with extensive shellfish culture

Long Jiang*, Theo Gerkema, Jeroen W.M. Wijsman, Karline Soetaert

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Shellfish cultures worldwide are often located in sheltered marine bays. The Oosterschelde is such a bay in the southwestern delta of the Netherlands, harboring extensive shellfish cultures, whose yield is partly driven by seston renewal from the North Sea. Tracer experiments performed with a three-dimensional hydrodynamic model were used to study the relative influences of benthic filtration and physical processes on seston replenishment. The model exhibited good skills in reproducing observed water level, temperature, salinity, and current velocity during 2009–2010. Turnover and residence times as indicators of water renewal showed substantial gradients from the mouth to head of the Oosterschelde. Surveyed bivalve biomass and empirical filtration rates were incorporated to estimate the effects of aquaculture on the seston concentration. The filtration created strong bio-deposition suppressing the eastward seston transport and causing <10% of external seston to be delivered to the head of the Oosterschelde. The effect of biological filtration on seston transport was comparable to that of physical forcing. This simple approach combining effects of physics and benthic communities can be applied more generally in food sustainability assessments of tidal bays.

Original languageEnglish
Pages (from-to)102-110
JournalJournal of Marine Systems
Volume194
DOIs
Publication statusPublished - 1 Jun 2019

Fingerprint

shellfish culture
seston
biofiltration
physics
hydrodynamics
tracer techniques
surface water level
aquaculture
Bivalvia
mouth
Netherlands
salinity
biomass
benthos
bivalve
residence time
turnover
temperature
water level
water

Keywords

  • Residence time
  • Seston transport
  • Suspension feeders
  • Tidal bay
  • Tracer experiment
  • Turnover time

Cite this

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title = "Comparing physical and biological impacts on seston renewal in a tidal bay with extensive shellfish culture",
abstract = "Shellfish cultures worldwide are often located in sheltered marine bays. The Oosterschelde is such a bay in the southwestern delta of the Netherlands, harboring extensive shellfish cultures, whose yield is partly driven by seston renewal from the North Sea. Tracer experiments performed with a three-dimensional hydrodynamic model were used to study the relative influences of benthic filtration and physical processes on seston replenishment. The model exhibited good skills in reproducing observed water level, temperature, salinity, and current velocity during 2009–2010. Turnover and residence times as indicators of water renewal showed substantial gradients from the mouth to head of the Oosterschelde. Surveyed bivalve biomass and empirical filtration rates were incorporated to estimate the effects of aquaculture on the seston concentration. The filtration created strong bio-deposition suppressing the eastward seston transport and causing <10{\%} of external seston to be delivered to the head of the Oosterschelde. The effect of biological filtration on seston transport was comparable to that of physical forcing. This simple approach combining effects of physics and benthic communities can be applied more generally in food sustainability assessments of tidal bays.",
keywords = "Residence time, Seston transport, Suspension feeders, Tidal bay, Tracer experiment, Turnover time",
author = "Long Jiang and Theo Gerkema and Wijsman, {Jeroen W.M.} and Karline Soetaert",
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Comparing physical and biological impacts on seston renewal in a tidal bay with extensive shellfish culture. / Jiang, Long; Gerkema, Theo; Wijsman, Jeroen W.M.; Soetaert, Karline.

In: Journal of Marine Systems, Vol. 194, 01.06.2019, p. 102-110.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

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AU - Jiang, Long

AU - Gerkema, Theo

AU - Wijsman, Jeroen W.M.

AU - Soetaert, Karline

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N2 - Shellfish cultures worldwide are often located in sheltered marine bays. The Oosterschelde is such a bay in the southwestern delta of the Netherlands, harboring extensive shellfish cultures, whose yield is partly driven by seston renewal from the North Sea. Tracer experiments performed with a three-dimensional hydrodynamic model were used to study the relative influences of benthic filtration and physical processes on seston replenishment. The model exhibited good skills in reproducing observed water level, temperature, salinity, and current velocity during 2009–2010. Turnover and residence times as indicators of water renewal showed substantial gradients from the mouth to head of the Oosterschelde. Surveyed bivalve biomass and empirical filtration rates were incorporated to estimate the effects of aquaculture on the seston concentration. The filtration created strong bio-deposition suppressing the eastward seston transport and causing <10% of external seston to be delivered to the head of the Oosterschelde. The effect of biological filtration on seston transport was comparable to that of physical forcing. This simple approach combining effects of physics and benthic communities can be applied more generally in food sustainability assessments of tidal bays.

AB - Shellfish cultures worldwide are often located in sheltered marine bays. The Oosterschelde is such a bay in the southwestern delta of the Netherlands, harboring extensive shellfish cultures, whose yield is partly driven by seston renewal from the North Sea. Tracer experiments performed with a three-dimensional hydrodynamic model were used to study the relative influences of benthic filtration and physical processes on seston replenishment. The model exhibited good skills in reproducing observed water level, temperature, salinity, and current velocity during 2009–2010. Turnover and residence times as indicators of water renewal showed substantial gradients from the mouth to head of the Oosterschelde. Surveyed bivalve biomass and empirical filtration rates were incorporated to estimate the effects of aquaculture on the seston concentration. The filtration created strong bio-deposition suppressing the eastward seston transport and causing <10% of external seston to be delivered to the head of the Oosterschelde. The effect of biological filtration on seston transport was comparable to that of physical forcing. This simple approach combining effects of physics and benthic communities can be applied more generally in food sustainability assessments of tidal bays.

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