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

Gernez, Pierre; Doxaran, David; Barillé, Laurent

doi:10.3389/fmars.2017.00137

Cited by 62 publications

(48 citation statements)

References 48 publications

(76 reference statements)

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“…Seventy‐six percent of the annual export of MPB biomass from the sediment to the water column occurs during flood in the model. In the Bay of Bourgneuf (NW France), Gernez et al () also retrieved higher benthic Chl a resuspension in flood than in ebb using the remote sensing algorithm used in our study.…”

Section: Discussionsupporting

confidence: 59%

“…Then, a near‐infrared/red band ratio was used to compute the phytoplankton absorption at 665 nm:

a_{phy} false(665 false) = \frac{false(0.70 + b_{b} false) ρ_{w} false(705 false)}{ρ_{w} false(665 false)} - 0.40 - b_{b}^{p},

where p is a constant set to 1.02 (Gernez et al, ). Finally, Chl a concentration (mg Chl a m −3 ) was obtained by dividing the phytoplankton absorption by the chlorophyll‐specific absorption coefficient at 665 nm (

a_{phy}^{*}

false[C h l normala false] = \frac{a_{p h y} false(665 false)}{a_{p h y}^{*} false(665 false)}

…”

Section: Methodsmentioning

confidence: 99%

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Impact of Chronic and Massive Resuspension Mechanisms on the Microphytobenthos Dynamics in a Temperate Intertidal Mudflat

et al. 2019

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Microphytobenthos (MPB) resuspension is a key mechanism in the transfer of organic matter from productive intertidal mudflats to terrestrial and marine systems. In this study, we infer on the contribution of physical and biological factors involved in the MPB resuspension. We use a physical‐biological coupled model forced by realistic meteorological and hydrodynamical forcings to simulate chronic (without any concomitant sediment resuspension) and massive (driven by bed failure) resuspension over a year. The model simulates mud surface temperature, MPB growth, and grazing by the gastropod Peringia ulvae. The model suggests that MPB resuspension is the highest in spring tides and at the flood beginning due to high current velocity and low water heights that promote waves‐sea bottom interactions. The seasonal export of MPB biomass is the highest in spring, up to threefold higher than in summer when the export is the lowest. The simulated seasonal dynamics of MPB resuspension results from the MPB biomass concentration in the sediment, physical disturbances, and the bioturbation activity by P. ulvae. Annually, 43% of the simulated MPB primary production is resuspended. The MPB resuspension (60.8 g C·m−2·yr−1) exceeds the loss by P. ulvae grazing (41.1 g C·m−2·yr−1). The model suggests that chronic and massive resuspension events are important in the synoptic to seasonal MPB dynamics in temperate intertidal mudflats. Accounting for such processes in the carbon budget assessment in the land‐ocean interface could bring new insights to our understanding of the role played by MPB in the coastal carbon cycle.

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Section: Discussionsupporting

confidence: 59%

“…Then, a near‐infrared/red band ratio was used to compute the phytoplankton absorption at 665 nm:

a_{phy} false(665 false) = \frac{false(0.70 + b_{b} false) ρ_{w} false(705 false)}{ρ_{w} false(665 false)} - 0.40 - b_{b}^{p},

a_{phy}^{*}

false[C h l normala false] = \frac{a_{p h y} false(665 false)}{a_{p h y}^{*} false(665 false)}

…”

Section: Methodsmentioning

confidence: 99%

Impact of Chronic and Massive Resuspension Mechanisms on the Microphytobenthos Dynamics in a Temperate Intertidal Mudflat

et al. 2019

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“…Over water, the airborne R rs (λ) spectra consistently display the typical spectral features of Bourgneuf Bay turbid areas [33,34]. The spectral shape, intensity, and standard deviation of the R rs (λ) spectra are very variable from one class to another (Figure 6a-c).…”

Section: Atmospheric Correction Over Watermentioning

confidence: 86%

“…SPM concentration is generally higher than 100 g·m −3 in the waters adjacent to the northern mudflats, and lower than 20 g·m −3 in the southern area [31][32][33]. Phytoplankton growth is limited by too high SPM concentration in the most turbid waters, but high concentration of chlorophyll-a (Chl-a), over 10 mg·m −3 , has been documented in the vicinity of the tidal flats [31,34] and is due to the resuspension of benthic microalgae [35].…”

Section: Study Sitementioning

confidence: 99%

“…In Bourgneuf Bay's nearshore waters, the variability in the concentration of SPM and of other colored constituents is mainly driven by tidal variability and bathymetry changes [33,34]. As turbidity varies due to tidal cycles of erosion, resuspension and redeposition, the most turbid areas generally correspond to the areas where hydrodynamics and/or tidal currents are maximal.…”

Section: Airborne Data Spatial Scales and Satellite Validationmentioning

confidence: 99%

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Using High-Resolution Airborne Data to Evaluate MERIS Atmospheric Correction and Intra-Pixel Variability in Nearshore Turbid Waters

2018

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Abstract:The implementation of accurate atmospheric correction is a prerequisite for satellite observation and water quality monitoring in coastal areas. The potential of the fast-line-of-sight atmospheric analysis of spectral hypercubes (FLAASH) was investigated here for the medium resolution imaging spectrometer (MERIS). As the comparison between discrete field sampling points and macro-scale satellite pixels is subject to spatial biases associated with small-scale spatial patchiness in the turbid and highly dynamic nearshore zone, an alternative approach was proposed here using high spatial resolution (1 m) airborne hyperspectral images as radiometric truthing references. While FLAASH was not optimal for moderately turbid offshore waters (suspended particulate matter (SPM) concentration < 50 g·m −3 ), it yields satisfactory results in the 50-1500 g·m −3 range, where MERIS standard atmospheric correction was subject to significant biases and failures. Due to the significant intra-pixel variability of SPM distribution in highly turbid areas, the acquisition of high resolution airborne images should be considered as a consistent strategy for the validation of medium resolution satellite remote sensing in the spatially heterogeneous and optically diverse nearshore waters.

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Magnitude and Extent of Water Clarification Services Provided by Bivalve Suspension Feeding

Cranford

2018

Goods and Services of Marine Bivalves

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Studies in bivalve ecology have emphasized that phytoplankton dynamics in coastal regions may be strongly coupled with bivalve suspension feeding activity to the extent that the bivalves play a major ecological role in controlling phytoplankton biomass. The water clarification capacity of natural and cultured bivalve populations serves as the foundation for what is considered to be a manageable bioengineering tool for mitigating the major symptoms of eutrophication and thereby providing positive ecosystem-scale services. Although often predicted, suspended particle depletion by bivalve aggregations has only recently been measured directly. Field observations of food depletion by bivalve aggregations confirm the large capacity for water clarification. However, progressively increasing the standing stock of bivalves to achieve greater water clarification benefits eventually lead to inefficiencies in bivalve feeding related to increased flow reduction from structure drag, which facilitates an increase in water re-filtration. These physical and biological processes ultimately constrain the maximum water clarification capacity of the population to levels that can be substantially less than previously predicted. Positive ecosystem services from bivalve grazing are likely to occur in many coastal areas experiencing eutrophication (e.g. Lindahl 2011). However, it is important to take an ecosystem-based management approach that also considers the potential for adverse environmental interactions that may be associated with intensive and extensive suspended bivalve operations.

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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

Cited by 62 publications

References 48 publications

Impact of Chronic and Massive Resuspension Mechanisms on the Microphytobenthos Dynamics in a Temperate Intertidal Mudflat

Impact of Chronic and Massive Resuspension Mechanisms on the Microphytobenthos Dynamics in a Temperate Intertidal Mudflat

Using High-Resolution Airborne Data to Evaluate MERIS Atmospheric Correction and Intra-Pixel Variability in Nearshore Turbid Waters

Magnitude and Extent of Water Clarification Services Provided by Bivalve Suspension Feeding

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