Mussel culture in a changing environment: the effects of a coastal engineering project on mussel culture (Mytilus edulis L.) in the Oosterschelde estuary (SW Netherlands)

Stralen, M.R. van; Dijkema, R.

doi:10.1007/978-94-011-1174-4_27

Cited by 22 publications

(23 citation statements)

References 26 publications

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“…In situ clearance rates generally were comparable to clearance rates measured on individual mussels in a field station. The clearance rates were in the same range as rates used by Smaal et al (1986) and Van Stralen & Dijkema (1994), who estimated that the mussel population in the Oosterschelde filters the entire volume of the estuary in less than 10 d. This corroborates the hypothesis that the mussel population in the Oosterscheide has a major effect on phytoplankton biomass (Smaal et al 1986. Herman & Scholten 1990.…”

Section: Discussionsupporting

confidence: 74%

Filtration and resuspension of particulate matter and phytoplankton on an intertidal mussel bed in the Oosterschelde estuary (SW Netherlands)

Prins¹,

Smaal²,

Pouwer³

et al. 1996

Mar. Ecol. Prog. Ser.

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In situ measurements were carried out on an intertidal mussel bed in the Oosterschelde estuary, SW Netherlands. Exchange of suspended particulate matter and phytoplankton between the water column and the mussel bed was measured with a Benthic Ecosystem Tunnel. In situ clearance rates of the mussel bed were compared to clearance rates of individual mussels measured in a field station under amblent conditions. Concentrations of suspended particulate matter (SPM) and particulate organic carbon (POC) in the water column above the tidal flat were affected by wind-induced resuspension. Chlorophyll a concentrations were higher during flood tides than during ebb tides, and were not affected by wind-induced resuspension. Clearance rates of the mussel bed ranged from 1.3 to 7.1 m3 m-2 h-'. In situ measured clearance rates generally were comparable to rates observed in measurements with individual mussels in a field station. Uptake of SPh4 and POC by the mussel bed was highly variable. Under calm weather conditions, uptake rates were correlated with inflow concentrations. Net uptake of phytoplankton was relatively higher than the uptake of POC, indicating that a major part of the POC was resuspended and exported from the mussel bed after filtration. In addition, wind stress induced considerable resuspension and export of SPM and POC from the mussel bed. Chlorophyll a uptake was less influenced by wind, and high rates of uptake, caused by mussel filtration, were observed. The result of filtration and resuspension processes was a net uptake by the mussel bed of particulate matter containing a relatively high proportion of phytoplankton: the mussel bed acted as a selective filter for phytoplankton.

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Section: Discussionsupporting

confidence: 74%

Filtration and resuspension of particulate matter and phytoplankton on an intertidal mussel bed in the Oosterschelde estuary (SW Netherlands)

Prins¹,

Smaal²,

Pouwer³

et al. 1996

Mar. Ecol. Prog. Ser.

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“…Thirdly, primary production, macrobenthos biomass, and the meat content of mussels in the western Wadden Sea did not decrease with reduced inputs of phosphorus and decreasing concentrations (Cadée and Hegeman, 1993; de Jonge et al, 1996). Van Stralen and Dijkema (1994) found a positive correlation between the annual primary production and the meat content of mussels in the Oosterschelde.…”

Section: Mesocosm Nutrient Reduction Experimentsmentioning

confidence: 94%

Patterns and trends in nutrients and phytoplankton in Dutch coastal waters: comparison of time-series analysis, ecological model simulation, and mesocosm experiments

Vries¹,

Duin²,

Peeters³

et al. 1998

ICES Journal of Marine Science

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In the Dutch coastal zone, nutrient and chlorophyll concentrations show gradients of up to one order of magnitude perpendicular to the coast within the first 30-50 km offshore. Time-series analysis reveals significant decreasing trends for dissolved inorganic phosphorus (40%) and total phosphorus (35%) and an increase in the dissolved inorganic N:P ratio from 25-30 to 40-55 over the period 1988-1995. Trends in nitrogen ( 15%), silicate (stable), and chlorophyll are smaller and generally not statistically significant. The trends in phosphorus reflect a proportional and immediate response to decreasing riverine inputs. The observed trends, spatial gradients, and long-term seasonal patterns are simulated quite well with a coupled physicalecological model with high spatial resolution for the coastal zone. The model results indicate no effect of decreasing phosphorus, but an important role for both nitrogen and light climate in primary production and algal biomass. These results have been reproduced in mesocosm experiments. Moreover, these experiments indicate a strong response of primary production and chlorophyll to nitrogen load, whereas secondary production (macrobenthos) remains relatively stable. Ecological efficiency of secondary production increases from 7% to >10%, with a decrease in nitrogen loading by 50% from the present level. In the absence of a significant nitrogen reduction in coastal waters, the mesocosm results cannot be related to field data as yet. However, the expectation is that reducing nitrogen inputs will not affect productivity at higher trophic levels to any great extent.1998 International Council for the Exploration of the Sea

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“…For that reason much research has been devoted to the structure of the soft bottom macrozoobenthos communities Seys et al ., 1994), to the fluctuations in standing stock, growth rates and mortality rates of blue mussels (Mytilus edulis) and cockles (Cerastoderma edule) Van Stralen & Dijkema, 1994), and to the nutrient regeneration capacity of filter feeders (Prins & Smaal, 1994) . Filter feeders act as a driving force in the turnover of phytoplankton biomass and nutrients in the estuary .…”

Section: Responses At the Ecosystem Levelmentioning

confidence: 99%

The Oosterschelde estuary, a case-study of a changing ecosystem: an introduction

Nienhuis

Smaal²

1994

Hydrobiologia

121

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During the period 1980-1990 long-term physical, chemical and ecological studies were carried out, to study the changes induced by the building of a storm-surge barrier in the mouth of the Oosterschelde estuary and two large auxiliary compartment dams in the rear ends of the estuary . The storm-surge barrier was constructed in the mouth of Oosterschelde estuary (SW Netherlands) during the period 1979-1986 . The barrier allows the tides to enter the estuary freely, and, on the other hand, the barrier guarantees safety for the human population and their properties when a stormflood threatens the area .Oosterschelde estuary is isolated from the river input, the rear ends of the ecosystem were separated from the estuary by sea-walls and the strongly decreased tidal exchange with the North Sea induced sheltered circumstances . The Oosterschelde changed from a turbid estuary into a tidal bay, and yet primary production responses appear to be robust and resilient, and the biological communities showed only quantitative shifts from the dominance of specific species assemblages to other assemblages . In many cases predicted changes in the structure of the biological communities could not be verified owing to the large natural variability mainly caused by physical factors (e .g . temperature) . The Delta Project -Storm flood protection in the OosterscheldeThe Netherlands Delta Project covers the socalled Delta area, created by the rivers Rhine, Meuse and Scheldt . Like most delta-estuarine environments, this area represents, in its natural state, complicated ecosystems consisting of a complex hydrodynamic regime, with fast-flowing water masses in tidal channels, changing estuarine configurations, inhomogeneous tidal and subtidal sediments, and salt-marsh areas subject to periodic flooding . The history of the SW Netherlands is marked by a continuous struggle between man and the sea . Since the year 1000 man reclaimed salt-marsh areas and transformed those into agricultural land . But irregularly occurring stormfloods broke the man-built seawalls and recaptured parts of the gained land. On February 1, 1953, a northwesterly storm induced tides to 3 m above normal levels, breached approximately 180 km of coastal-defense dikes and flooded 160000 hectares of polderland . 1835 people lost their lives in this large storm flood, more than 46000 farms and buildings were destroyed or damaged, and approximately 200000 farm animals were lost .The Delta Project, formalized in 1957 by an act

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Mussel culture in a changing environment: the effects of a coastal engineering project on mussel culture (Mytilus edulis L.) in the Oosterschelde estuary (SW Netherlands)

Cited by 22 publications

References 26 publications

Filtration and resuspension of particulate matter and phytoplankton on an intertidal mussel bed in the Oosterschelde estuary (SW Netherlands)

Filtration and resuspension of particulate matter and phytoplankton on an intertidal mussel bed in the Oosterschelde estuary (SW Netherlands)

Patterns and trends in nutrients and phytoplankton in Dutch coastal waters: comparison of time-series analysis, ecological model simulation, and mesocosm experiments

The Oosterschelde estuary, a case-study of a changing ecosystem: an introduction

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