Primary production and spatial distribution of subtidal microphytobenthos in a temperate coastal system, the Bay of Brest, France

Longphuirt, Sorcha Ní; Clavier, Jacques; Grall, Jacques; Chauvaud, Laurent; Loc’h, François Le; Berre, Iwan Le; Flye-Sainte-Marie, Jonathan; Richard, Joëlle; Leynaert, Aude

doi:10.1016/j.ecss.2007.04.025

Cited by 44 publications

(25 citation statements)

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“…For integrated benthic communities, most determinations of PQ range between 0.9 and 1.3 depending on light and nutrient availability (Hargrave et al 1983;Cahoon and Cooke 1992;Ni Longphuirt et al 2007). Based on 50 incubations of sediment cores, the community PQ of a high Arctic sediment averaged at 1.19 ± 0.48 (Glud et al 2002).…”

Section: Discussionmentioning

confidence: 99%

Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line

et al. 2010

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During summer 2007, Arctic microphytobenthic potential primary production was measured at several stations around the coastline of Kongsfjorden (Svalbard, Norway) at B5 m water depth and at two stations at five different water depths (5, 10, 15, 20, 30 m). Oxygen planar optode sensor spots were used ex situ to determine oxygen exchange in the overlying water of intact sediment cores under controlled light (ca. 100 lmol photons m -2 s -1 ) and temperature (2-4°C) conditions. Patches of microalgae (mainly diatoms) covering sandy sediments at water depths down to 30 m showed high biomass of up to 317 mg chl a m -2 . In spite of increasing water depth, no significant trend in ''photoautotrophic active biomass'' (chl a, ratio living/dead cells, cell sizes) and, thus, in primary production was measured at both stations. All sites from B5 to 30 m water depth exhibited variable rates of net production from -19 to ?40 mg O 2 m -2 h -1 (-168 to ?360 mg C m -2 day -1 ) and gross production of about 2-62 mg O 2 m -2 h -1 (17-554 mg C m -2 day -1

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Section: Discussionmentioning

confidence: 99%

Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line

et al. 2010

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“…Converting to carbon units requires some assumptions regarding the carbon to oxygen stoichiometry of various aerobic and anaerobic metabolic processes , and ratios may range from 0.8-1.4 for various processes Ní Longphuirt et al 2007). An oxygen to carbon ratio of 1:1 for NCP is commonly assumed in the estuarine literature.…”

Section: Comparison To Literature Valuesmentioning

confidence: 99%

Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments

Howard¹

2017

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Salt marshes are physically, chemically, and biologically dynamic environments found globally at temperate latitudes. Tidal creeks and marshtop ponds may expand at the expense of productive grasscovered marsh platform. It is therefore important to understand the present magnitude and drivers of production and respiration in these submerged environments in order to evaluate the future role of salt marshes as a carbon sink. This thesis describes new methods to apply the triple oxygen isotope tracer of photosynthetic production in a salt marsh. Additionally, noble gases are applied to constrain air-water exchange processes which affect metabolism tracers. These stable, natural abundance tracers complement traditional techniques for measuring metabolism. In particular, they highlight the potential importance of daytime oxygen sinks besides aerobic respiration, such as rising bubbles. In tidal creeks, increasing nutrients may increase both production and respiration, without any apparent change in the net metabolism. In ponds, daytime production and respiration are also tightly coupled, but there is high background respiration regardless of changes in daytime production. Both tidal creeks and ponds have higher respiration rates and lower production rates than the marsh platform, suggesting that expansion of these submerged environments could limit the ability of salt marshes to sequester carbon. AcknowledgmentsFinancial support for my doctoral research was provided by the United States Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program, the National Science Foundation under grant OCE-1233678, and the Woods Hole Oceanographic Institution (WHOI) under grants from the WHOI Coastal Ocean Institute, Ocean and Climate Change Institute, and Ocean Life Institute. WHOI Academic Programs Office also provided funding support for research, through the Ocean Ventures Fund, and for my stipend, as graduate research assistantships including an assistantship from the United States Geological Survey administered by WHOI. I am very grateful for this financial support which allowed me earn a living wage while focused on my doctoral research.In addition, the great majority of this work would not have been possible without the outstanding logistical and in kind support of many scientific teams and individuals, including the Plum Island Ecosystems Long Term Ecological Research site and TIDE experiment staff and scientists (these projects funded by NSF OCE 1238212, NSF DEB 1354494, and NE Climate Science Center grant DOI G12AC00001), Nancy Pau at the Parker River National Wildlife Refuge who granted permits for the work in Chapters 4 and 5, and Liz Kujawinski and Krista Longnecker at WHOI who invited me to participate on cruise KN210-04 in the South Atlantic (funded by NSF grant OCE 1154320).Specific acknowledgments are also found in each chapter of this thesis, but I'd like to thank a number of individuals in particular who helped me plan for, collect, and analyze the data that u...

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“…; Ni Longphuirt et al 2007). Compared to previously reported values in photosynthesis research (Kuhl et al 1996, Denis et al 2012, the compensation irradiances were also generally low (7 and 14 µmol photons m −2 s −1 for Svalbard and Helgoland, respectively), although somewhat larger than those re ported previously for an Arctic fjord in Greenland ; Gattuso et al 2006).…”

Section: Microphytobenthic Photosynthesismentioning

confidence: 99%

Oxygen budgets in subtidal arctic (Kongsfjorden, Svalbard) and temperate (Helgoland, North Sea) microphytobenthic communities

Sevilgen

Beer

Al-Handal³

et al. 2014

Mar. Ecol. Prog. Ser.

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We compared primary production and respiration of temperate (Helgoland, North Sea) and subtidal Arctic (Kongsfjorden, Svalbard) microphytobenthic communities during summer. The diatom communities were generally characterized as cosmopolitan, displayed no site specificity, and had similar chl a and fucoxanthin concentrations. Their net and gross photosynthesis rates and light adaptation intensities, derived from laboratory microsensor measurements, were also similar, despite differences in water temperature. Daily oxygen fluxes across the sediment−water interface were estimated by combining laboratory microprofile and planar optode measurements with in situ data on oxygen penetration and light dynamics. During the study period, the Svalbard sediments were on average net heterotrophic, while the Helgoland sediments were net autotrophic (−22.4 vs. 9.2 mmol O 2 m −2 d −1). This was due to high infaunal abundance in the Svalbard sediments that caused high oxygen uptake rates in the sediments and consumption below the sediment euphotic zone. Additionally, bioirrigation of the sediment due to infaunal burrow ventilation was reduced by light; thus, the sedimentary oxygen inventory was reduced with increasing light. Conversely, light-enhanced the oxygen inventory in the Helgoland sediments. Oxygen dynamics in the Svalbard sediments were therefore dominated by bioirrigation, whereas in the Helgoland sediments they were dominated by photosynthetic oxygen production.

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Primary production and spatial distribution of subtidal microphytobenthos in a temperate coastal system, the Bay of Brest, France

Cited by 44 publications

References 50 publications

Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line

Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line

Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments

Oxygen budgets in subtidal arctic (Kongsfjorden, Svalbard) and temperate (Helgoland, North Sea) microphytobenthic communities

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