Primary Production by Phytoplankton and Microphytobenthos in Estuaries

Underwood, Graham J. C.; Kromkamp, Jacco C.

doi:10.1016/s0065-2504(08)60192-0

Cited by 739 publications

(665 citation statements)

References 222 publications

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“…This can result in significant enrichment of nearshore waters with a high concentration of chlorophyll a (chl a) that becomes available food for suspension feeders such as the Pacific oyster Crassostrea gigas and other commercially and ecologically important bivalves (Kang et al, 2006;Choy et al, 2009). In coastal zones, despite the high contribution of tidal flats to primary production (Underwood and Kromkamp, 1999), the spatial distribution and temporal dynamic of chl a concentration in intertidal waters has been little studied using ocean color remote sensing so far.…”

Section: Introductionmentioning

confidence: 99%

Shellfish Aquaculture from Space: Potential of Sentinel2 to Monitor Tide-Driven Changes in Turbidity, Chlorophyll Concentration and Oyster Physiological Response at the Scale of an Oyster Farm

2017

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The algorithms of Novoa et al. (2017) and Gons et al. (2005) were recalibrated and applied to Sentinel2 data to retrieve suspended particulate matter (SPM) and chlorophyll a (chl a) concentration in the environmentally and economically important intertidal zones. Sentinel2-derived chl a and SPM concentration distributions were analyzed at the scale of an oyster farm over a variety of tidal conditions. Sentinel2 imagery was then coupled with ecophysiological modeling to analyze the influence of tide-driven chl a and SPM dynamics on oyster clearance and chl consumption rates. Within the studied oyster farming site (Bourgneuf Bay along the French Atlantic coast), chl consumption rate mirrored the changes in chl a concentration during neap tides, whereas oyster clearance and chl consumption rates were both negatively impacted by high SPM concentration during spring tides.

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Section: Introductionmentioning

confidence: 99%

Shellfish Aquaculture from Space: Potential of Sentinel2 to Monitor Tide-Driven Changes in Turbidity, Chlorophyll Concentration and Oyster Physiological Response at the Scale of an Oyster Farm

2017

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“…The shallow waters of these coastal systems provide suYcient irradiance for the growth of photosynthetic prokaryotes, protists and vascular plants (Reise, 2002). The total primary production in estuarine and shallow water ecosystems is signiWcantly attributable to the activity of microphytobenthos (Underwood & Kromkamp, 1999). Pennate diatoms dominate the estuarine microphytobenthic Xora (Round, Crawford, & Mann, 1990;Smith & Underwood, 1998) and are known as an important link in the benthic food chain.…”

Section: Introductionmentioning

confidence: 99%

Does sediment grain size affect diatom grazing by harpacticoid copepods?

Troch

Houthoofd

Chepurnov

et al. 2006

Marine Environmental Research

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Estuarine soft sediments support a diverse group of eukaryotic and prokaryotic organisms though the role of the sediment per se for the functioning of these organisms remains largely unknown. The present study aimed to test the eVect of sediment grain size on the grazing activities of harpacticoid copepods. In controlled experiments, two common intertidal harpacticoid species (Paramphiascella fulvofasciata and Nitokra spinipes) were each oVered a mix of two benthic diatom species (Navicula phyllepta and Seminavis robusta) in diVerent sedimentary conditions. Several microcosms were created using a variety of sediment types, including Wne silt (<63 m), coarser grained sands (125-250, 250-450, 100-300 m), artiWcial 'sediments' of glass beads (250-500, 2000 m) and even the absence of sediment was tested. The diatoms were enriched in the stable carbon 13 C to facilitate tracing in the harpacticoids. Both copepod species were able to graze on the diatoms with highest uptake when sediment was absent. In contrast, both harpacticoid species showed no uptake in silty conditions. In general, grazing was favoured when mean sediment grain size increased. The strong negative eVect of Wne grains on the grazer's eYciency can be explained by the resulting diVerences in the structure (and accessibility) of the diatom bioWlm on the one hand and the mobility of the grazer on the other hand. In view of the subtle equilibrium between primary producers and grazers, these results might have important implications for the eVect of siltation of tidal Xats due to, e.g., human activities. 

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“…Typically, diatoms are the dominant group forming golden-brown biofilms at the sediment surface during low tides [1][2][3]. Exhibiting very high primary productivity rates that can result in contributions of up to 50% of the total estuarine autochtonous primary production [4], these biofilms provide essential ecosystem services (e.g. food sources for various trophic webs, sediment stabilization via exopolysaccharide secretion (EPS) cohesion, mediation of nutrients fluxes).…”

Section: Introductionmentioning

confidence: 99%

Microphytobenthos Primary Production Estimated by Hyperspectral Reflectance

Méléder¹,

Lavaud²,

Barnett³

et al. 2016

Preprint

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Abstract:Monitoring photosynthesis is a great challenge to improve our knowledge of plant productivity at the ecosystem level, which may be achieved using remote-sensing techniques with synoptic abilities. The main objective of the current study is to take up this challenge for microphytobenthos (MPB) primary production in intertidal mudflats. This was achieved by coupling hyperspectral radiometry (reflectance, ρ and second derivative, δδ) and PAM-fluorometry (non-sequential light curve, NSLC) measurements. The later allowed the estimation of the primary production via the light use efficiency (LUE) and the electron transport rate (ETR) whereas ρ allowed to estimate pigment composition and optical absorption cross-section (a*). Five MPB species representative of the main growth forms: epipelic (benthic motile), epipsammic (benthic motile and non motile) and thycoplanktonic (temporarily resuspended in the water column) were lighted at increasing light intensity from dark to 1950 µmol photons.m -2 .s -1 . After spectral measurements, a* was retrieved using a radiative transfer model and several radiometric indices were tested for their capacity to predict LUE and ETR. The spectral estimation of these two photosynthetic variables was subsequently compared to the values estimated by PAM-fluorometry. Results showed that different responses related to the xanthophyll cycle (de-epoxydation state) were observed for the three growthforms with increasing light levels. However, a single relationship with radiometric index was not affected by species/growth-forms, i.e. δδ 496/508 , called the MPB LUE index to predict LUE and ETR. This index has the potential to be applied to air borne hyperspectral imagery for large-scale assessment of MPB production.

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Primary Production by Phytoplankton and Microphytobenthos in Estuaries

Cited by 739 publications

References 222 publications

Shellfish Aquaculture from Space: Potential of Sentinel2 to Monitor Tide-Driven Changes in Turbidity, Chlorophyll Concentration and Oyster Physiological Response at the Scale of an Oyster Farm

Shellfish Aquaculture from Space: Potential of Sentinel2 to Monitor Tide-Driven Changes in Turbidity, Chlorophyll Concentration and Oyster Physiological Response at the Scale of an Oyster Farm

Does sediment grain size affect diatom grazing by harpacticoid copepods?

Microphytobenthos Primary Production Estimated by Hyperspectral Reflectance

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