Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel)

Serre-Fredj, Léon; Jacqueline, Franck; Navon, Maxime; Izabel, G.; Chasselin, Léo; Jolly, Orianne; Répécaud, Michel; Claquin, Pascal

doi:10.1016/j.marpolbul.2021.112387

Cited by 12 publications

(7 citation statements)

References 99 publications

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“…The Turner Cyclops fluorometers used here have been used in many other studies for monitoring algal blooms in marine and freshwater. ,− They have also been tested in trials by the Alliance for Coastal Technologies and showed comparable results to other commercially available fluorometers . Although they have limitations, at least one study shows that they are useful for monitoring large increases in pigments, indicative of bloom conditions .…”

Section: Discussionmentioning

confidence: 89%

“…Data buoys have become integral parts of aquatic monitoring programs, providing continuous data day and night in remote environments and through inclement weather events when manual sampling by boat is not possible. − The in situ sensor data provided by data buoys have been coupled with laboratory measurements and/or satellite remote sensing data in modeling approaches to predict or “nowcast” cyanoHABs and other phenomena. ,,− …”

Section: Introductionmentioning

confidence: 99%

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Real-Time Monitoring of Cyanobacterial Harmful Algal Blooms with the Panther Buoy

et al. 2022

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Cyanobacterial harmful algal blooms (cyanoHABs) are a growing problem in aquatic environments. Here, a new data buoy system is described (i.e., “the Panther buoy”) for monitoring cyanoHABs and associated conditions. The system uses a custom open-source data logger, an embedded modem, and a solar charge regulator with off-the-shelf sensors on a compact platform. Panther buoys were deployed in Green Bay, USA, and Lake Superior at the Apostle Islands, USA, to monitor water temperature with depth and chlorophyll-a and phycocyanin fluorescence. Additional Panther buoys were deployed in Sturgeon Bay and Summerfest Lagoon, Milwaukee, to monitor wind and water temperature with depth. Cellular data were transmitted every 2–10 min in 98 ± 10% of data transmissions of 10–30K sampling events per deployment. A new temperature chain is described and shown to have high precision (R = 0.99 and P < 0.001) and accuracy within 0.31 °C of commercial sensors. Panther buoys in Lake Superior and Green Bay detected increases in phycocyanin or chlorophyll-a fluorescence, indicative of moderate bloom events. Wind measurements in Summerfest Lagoon and Sturgeon Bay were significantly correlated with commercial wind sensors. Altogether, these deployments indicate that the Panther buoy system is a reliable device for monitoring cyanoHABs and associated conditions.

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Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Real-Time Monitoring of Cyanobacterial Harmful Algal Blooms with the Panther Buoy

et al. 2022

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“…Biofilm from classic modules also presented a higher Fv/Fm than biofilm from eco-engineering modules. We pointed out that de absorption crosssection of the PSII was also different, which indicated variation of photoacclimatation process or difference on community structure [40,41]. Analysis of the biofilm community structure is still in process by coupling microscopic and molecular approaches.…”

Section: Resultsmentioning

confidence: 99%

Primary production assessment on eco-engineering infrastructures: English Channel case study

Claquin

Vivier

Navon

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In the Marineff project, experimental eco-engineering dyke modules were immersed in 2020 in the Bay of Cherbourg (English Channel). Eco-engineering and classic dyke modules were compared regarding biodiversity and productivity. This paper presents the monitoring strategy of primary production assessment applied. Primary production assessment was performed by coupling various technics in order to consider all the compartments of primary producers present on the dykes and in the associated surrounding water mass. Seaweeds, microphytobenthos and phytoplankton were studied. Benthic chambers measuring oxygen and pCO2 under controlled light, and technics based on variable fluorescence were applied on eco-engineering and classic dyke modules. Preliminary results are presented in order to illustrate the expected indicator and methodology improvement and limits were discussed. The whole data set will allow us to explore the relationship between productivity and biodiversity as a function of the sites and of the nature of the infrastructure, eco-engineering or not. At this stage of our study we pointed out that the macroalgae were 7.9 times more productive than biofilm per surface on eco-engineering module whilst only 1.5 times on classic module. Smooth surface appeared to favour biofilm productivity at this stage of colonisation while rough surface drove more quickly the system to a production dominated by macroalgae.

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“…Highfrequency data provide a more accurate detection of the day of the IPGP, while an uncertainty of about ± 7 d is observed with low-frequency observations. This comparison between high-and low-frequency-based IPGP detection highlights the sensitivity of sampling strategy in the observation of phytoplankton growing periods (Bouman et al, 2005;Serre-Fredj et al, 2021) related to the response of the ecosystem within a few hours after an environmental change (Lefort and Gasol, 2014;Thyssen et al, 2008).…”

Section: Validation Of the Methods For Ipgp Detectionmentioning

confidence: 95%

Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems

et al. 2022

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Abstract. Decadal time series of chlorophyll a concentrations sampled at high and low frequencies are explored to study climate-induced impacts on the processes inducing interannual variations in the initiation of the phytoplankton growing period (IPGP) in early spring. We specifically detail the IPGP in two contrasting coastal temperate ecosystems under the influence of rivers highly rich in nutrients: the Bay of Brest and the Bay of Vilaine. In both coastal ecosystems, we observed a large interannual variation in the IPGP influenced by sea temperature, river inputs, light availability (modulated by solar radiation and water turbidity), and turbulent mixing generated by tidal currents, wind stress, and river runoff. We show that the IPGP is delayed by around 30 d in 2019 in comparison with 2010. In situ observations and a one-dimensional vertical model coupling hydrodynamics, biogeochemistry, and sediment dynamics show that the IPGP generally does not depend on one specific environmental factor but on the interaction between several environmental factors. In these two bays, we demonstrate that the IPGP is mainly caused by sea surface temperature and available light conditions, mostly controlled by the turbidity of the system before first blooms. While both bays are hydrodynamically contrasted, the processes that modulate the IPGP are similar. In both bays, the IPGP can be delayed by cold spells and flood events at the end of winter, provided that these extreme events last several days.

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Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel)

Cited by 12 publications

References 99 publications

Real-Time Monitoring of Cyanobacterial Harmful Algal Blooms with the Panther Buoy

Real-Time Monitoring of Cyanobacterial Harmful Algal Blooms with the Panther Buoy

Primary production assessment on eco-engineering infrastructures: English Channel case study

Interannual variability of the initiation of the phytoplankton growing period in two French coastal ecosystems

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