Seasonality of microphytobenthos revealed by remote-sensing in a South European estuary

Brito, Ana C.; Benyoucef, Ismaїl; Jesus, Bruno; Brotas, Vanda; Gernez, Pierre; Mendes, Carlos; Launeau, Patrick; Dias, Maria P.; Barillé, Laurent

doi:10.1016/j.csr.2013.07.004

Cited by 57 publications

(55 citation statements)

References 55 publications

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“…Intra-and interannual MPB variability have previously been assessed on different scales using archived satellite images. For example, MPB seasonal cycles were described for several European mudflats using either medium-resolution (250 m) satellite data such as MODIS (van der Wal et al, 2010), or higher spatial resolution (10-20 m) data such as SPOT (Brito et al, 2013). Few remote sensing (RS) studies to date, however, have described MPB dynamics at both high spatial and temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

“…At low tide, MPB biomass can be quantified with the normalized difference vegetation index (NDVI) (Méléder et al, 2003;van der Wal et al, 2010;Brito et al, 2013;Benyoucef et al, 2014), which uses chlorophyll a optical properties in the red and near-infrared spectral regions. MPB biomass is characterized by high heterogeneity occurring on various spatial scales (Chapman et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

et al. 2018

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Abstract. Satellite remote sensing (RS) is routinely used for the large-scale monitoring of microphytobenthos (MPB) biomass in intertidal mudflats and has greatly improved our knowledge of MPB spatio-temporal variability and its potential drivers. Processes operating on smaller scales however, such as the impact of benthic macrofauna on MPB development, to date remain underinvestigated. In this study, we analysed the influence of wild Crassostrea gigas oyster reefs on MPB biofilm development using multispectral RS. A 30-year time series combining high-resolution (30 m) Landsat and SPOT data was built in order to explore the relationship between C. gigas reefs and MPB spatial distribution and seasonal dynamics, using the normalized difference vegetation index (NDVI). Emphasis was placed on the analysis of a before-after control-impact (BACI) experiment designed to assess the effect of oyster killing on the surrounding MPB biofilms. Our RS data reveal that the presence of oyster reefs positively affects MPB biofilm development. Analysis of the historical time series first showed the presence of persistent, highly concentrated MPB patches around oyster reefs. This observation was supported by the BACI experiment which showed that killing the oysters (while leaving the physical reef structure, i.e. oyster shells, intact) negatively affected both MPB biofilm biomass and spatial stability around the reef. As such, our results are consistent with the hypothesis of nutrient input as an explanation for the MPB growth-promoting effect of oysters, whereby organic and inorganic matter released through oyster excretion and biodeposition stimulates MPB biomass accumulation.MPB also showed marked seasonal variations in biomass and patch shape, size and degree of aggregation around the oyster reefs. Seasonal variations in biomass, with higher NDVI during spring and autumn, were consistent with those observed on broader scales in other European mudflats. Our study provides the first multi-sensor RS satellite evidence of the promoting and structuring effect of oyster reefs on MPB biofilms.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

et al. 2018

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“…In many mudflat MPB biofilms are visible from space, and they have been studied using airborne and satellite remote sensing (Méléder et al, 2003;van der Wal et al, 2010;Kazemipour et al, 2012;Brito et al, 2013). Although MPB main ecological functions are carried out when it is organized in the form of biofilms, benthic microalgae can also be resuspended into the water column together with other sedimentary particles throughout the tidal cycle (Koh et al, 2006;Ubertini et al, 2012).…”

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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“…However, monitoring photosynthesis from Space, has been recently proposed for land resources (for a review see [13]). It is a great challenge to improve our knowledge of the main drivers and resources constraints of plant productivity and it is needed for predicting impacts of climate change [8,13] and management of costal ecosystems [7,11]. The main objective of the current study is to take up this challenge for MPB primary production.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, remote sensing studies have mainly focused on quantifying MPB biomass [7][8][9][10][11][12] and no algorithm exists yet to estimate MPB primary production from remote sensing imagery. However, monitoring photosynthesis from Space, has been recently proposed for land resources (for a review see [13]).…”

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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Seasonality of microphytobenthos revealed by remote-sensing in a South European estuary

Cited by 57 publications

References 55 publications

Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

Satellite remote sensing reveals a positive impact of living oyster reefs on microalgal biofilm development

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

Microphytobenthos Primary Production Estimated by Hyperspectral Reflectance

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