Comparison of benthic oxygen exchange measured by aquatic Eddy Covariance and Benthic Chambers in two contrasting coastal biotopes (Bay of Brest, France)

Polsenaere, Pierre; Deflandre, Bruno; Thouzeau, Gérard; Rigaud, Sylvain; Cox, Tom J. S.; Amice, Erwan; Bec, Thierry Le; Bihannic, Isabelle; Maire, Olivier

doi:10.1016/j.rsma.2021.101668

Cited by 7 publications

(7 citation statements)

References 53 publications

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“…Other methods include estimates of photosynthetic parameters via incubations of sporophytes (or parts of sporophytes; Borum et al 2002), using laboratory aquaria (Duarte et al 2013; Burdett et al 2019) or more recently in the field (Noël et al 2010; Rodgers et al 2015; Edwards et al 2020) with measurement of net oxygen evolution used as a proxy for carbon fixation (Antón et al 2011). More recently eddy flux covariance methods have been developed, integrating in situ oxygen fluxes and velocity measurements to estimate community integrated productivity, but their deployment has so far been restricted to sheltered habitats (Attard et al 2019; Polsenaere et al 2021). Photosynthetic rates can be measured under a range of light levels to generate photosynthesis–irradiance (P–I) curves, which describe the relationship between photosynthesis and light (Kirk 2011).…”

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confidence: 99%

In situ estimates of kelp forest productivity in macro‐tidal environments

White

Loisel

Sevin

et al. 2021

Limnology & Oceanography

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Accurately quantifying primary productivity of marine macrophytes is essential to further understanding of coastal ecosystem functioning and will allow its inclusion within marine ecosystem models. Traditional quantification of carbon standing stock and biomass accumulation only allow rough estimates of net primary production whereas incubations that measure photosynthesis in the laboratory lack realism and underestimate true photosynthetic rates. We developed in situ photorespirometry methods to estimate productivity of Laminaria hyperborea, the dominant forest‐building kelp species in Northeast Atlantic. We show that sub‐canopy individuals are better adapted to low light levels with higher photosynthetic efficiency and lower compensation point than larger canopy individuals. Laboratory incubations of L. hyperborea stipes revealed that productivity rates could be positive or negative, even at saturating irradiances, depending on whether they were dominated by autotrophic or heterotrophic communities, respectively. Scaling up productivity estimates based on local population demographics resulted in mean daily net productivity rates of 13.3 and −30.1 g C m−2 d−1, for shallow L. hyperborea forest during late summer and autumn, respectively. At saturating irradiances in the late summer–autumn study period, estimates of net and gross productivity reached 9.4 and 12 g C m−2 h−1, respectively. Sub‐canopy individuals were responsible for 12% of estimated daily productivity during summer, but 20% in autumn. We conclude that in situ photorespirometry provides a more direct measurement of production, unaffected by exudation of dissolved carbon or tissue loss, that can account for sub‐canopy and stipe components of the kelp forest, commonly excluded from traditional studies.

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confidence: 99%

In situ estimates of kelp forest productivity in macro‐tidal environments

White

Loisel

Sevin

et al. 2021

Limnology & Oceanography

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“…This would suggest that the significant tidal (12h) component in Ba/Ca and Mn/Ca records through P. maximus (Fig. 3) is driven directly by redox changes over the strong tidal cycle in the Bay of Brest (see Polsenaere et al, 2021) and resuspension of Ba and Mn due to tidal currents (Hily et al, 1992), while tidal rhythms in Mg/Ca and Sr/Ca may be a consequence of the scallop's calcification response to changes in its environment (e.g., temperature, salinity and light availability) through the large (up to 7m range) tidal cycle (Fig. 7).…”

Section: Short-term Changes In Shell Composition In Tridacnidsmentioning

confidence: 99%

Ultradian rhythms in shell composition of photosymbiotic and non-photosymbiotic mollusks

Winter

Killam

Fröhlich

et al. 2022

Preprint

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Abstract. The chemical composition of mollusk shells is a useful tool in (paleo)climatology since it captures inter- and intra-annual variability in environmental conditions. Trace element and stable isotope analyses with improved sampling resolution now enable the use of mollusk shells for paleoenvironmental reconstructions at a daily to sub-daily resolution. Here, we discuss hourly resolved Mg/Ca, Mn/Ca, Sr/Ca and Ba/Ca profiles measured by laser ablation ICP-MS through shells of photosymbiotic giant clams (Tridacna maxima, Tridacna squamosa and Tridacna squamosina) and the non-photosymbiotic scallop Pecten maximus. Precise sclerochronological age models and spectral analysis allowed us to extract daily and tidal rhythms in the trace element composition of these shells. We find significant expression of these periodicities but conclude that this cyclicity explains less than 10 % of the sub-annual variance in trace element profiles. Tidal and diurnal rhythms explain variability of at most 0.2 mmol/mol (~10 % of mean value) in Mg/Ca and Sr/Ca, while Mn/Ca and Ba/Ca cyclicity has a median amplitude of less than 2 µmol/mol (~40 % and 80 % of the mean of Mn/Ca and Ba/Ca, respectively). Daily periodicity in Sr/Ca and Ba/Ca is stronger in Tridacna than in Pecten, with Pecten showing stronger tidal periodicity. One T. squamosa specimen which grew under a sunshade exhibits some of the strongest diurnal cyclicity. Daily cycles in trace element composition of giant clams are therefore unlikely to be driven by variations in direct insolation itself but reflect an inherent biological rhythmic process affecting element incorporation. Finally, the large amount of trace element variability unexplained by periodic variability highlights the dominance of aperiodic processes in mollusk physiology and/or environmental conditions on shell composition at the sub-daily scale. Future studies should aim to investigate whether part of this aperiodic variability in shell chemistry reliably records weather patterns or circulation changes in the paleoenvironment.

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“…In this technique, joint high frequency measurement of O 2 (>10 Hz) and of vertical currents at a given point in BBL by an acoustic doppler velocimeter (ADV) enables continuous estimates of the O 2 exchange flux and O 2 dynamics within the BBL. The technique is also applicable in habitats with hard and complex substrate in coastal or deep-ocean settings (Berg et al, 2009;Rovelli et al, 2015;Attard et al, 2019;Polsenaere et al, 2021).…”

Section: Benthic Platformsmentioning

confidence: 99%

A Global Ocean Oxygen Database and Atlas for Assessing and Predicting Deoxygenation and Ocean Health in the Open and Coastal Ocean

et al. 2021

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In this paper, we outline the need for a coordinated international effort toward the building of an open-access Global Ocean Oxygen Database and ATlas (GO2DAT) complying with the FAIR principles (Findable, Accessible, Interoperable, and Reusable). GO2DAT will combine data from the coastal and open ocean, as measured by the chemical Winkler titration method or by sensors (e.g., optodes, electrodes) from Eulerian and Lagrangian platforms (e.g., ships, moorings, profiling floats, gliders, ships of opportunities, marine mammals, cabled observatories). GO2DAT will further adopt a community-agreed, fully documented metadata format and a consistent quality control (QC) procedure and quality flagging (QF) system. GO2DAT will serve to support the development of advanced data analysis and biogeochemical models for improving our mapping, understanding and forecasting capabilities for ocean O2 changes and deoxygenation trends. It will offer the opportunity to develop quality-controlled data synthesis products with unprecedented spatial (vertical and horizontal) and temporal (sub-seasonal to multi-decadal) resolution. These products will support model assessment, improvement and evaluation as well as the development of climate and ocean health indicators. They will further support the decision-making processes associated with the emerging blue economy, the conservation of marine resources and their associated ecosystem services and the development of management tools required by a diverse community of users (e.g., environmental agencies, aquaculture, and fishing sectors). A better knowledge base of the spatial and temporal variations of marine O2 will improve our understanding of the ocean O2 budget, and allow better quantification of the Earth’s carbon and heat budgets. With the ever-increasing need to protect and sustainably manage ocean services, GO2DAT will allow scientists to fully harness the increasing volumes of O2 data already delivered by the expanding global ocean observing system and enable smooth incorporation of much higher quantities of data from autonomous platforms in the open ocean and coastal areas into comprehensive data products in the years to come. This paper aims at engaging the community (e.g., scientists, data managers, policy makers, service users) toward the development of GO2DAT within the framework of the UN Global Ocean Oxygen Decade (GOOD) program recently endorsed by IOC-UNESCO. A roadmap toward GO2DAT is proposed highlighting the efforts needed (e.g., in terms of human resources).

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Comparison of benthic oxygen exchange measured by aquatic Eddy Covariance and Benthic Chambers in two contrasting coastal biotopes (Bay of Brest, France)

Cited by 7 publications

References 53 publications

In situ estimates of kelp forest productivity in macro‐tidal environments

In situ estimates of kelp forest productivity in macro‐tidal environments

Ultradian rhythms in shell composition of photosymbiotic and non-photosymbiotic mollusks

A Global Ocean Oxygen Database and Atlas for Assessing and Predicting Deoxygenation and Ocean Health in the Open and Coastal Ocean

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