Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient

Fouilland, Éric; Floc’h, Emilie Le; Brennan, Debra; Bell, Elanor M.; Lordsmith, Sian; McNeill, Sharon; Mitchell, Elaine; Brand, Tim; García-Martín, Enma Elena; Leakey, Raymond J.G.

doi:10.1093/femsec/fiy150

Cited by 7 publications

(7 citation statements)

References 56 publications

(64 reference statements)

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“…In these two seasons, lagoon BCD strongly exceeded primary production, consequently, bacterioplankton must rely on allochthonous organic carbon to sustain its carbon requirements. These differences between lagoon and offshore situations in the bacterio-phytoplankton coupling are in agreement with the main observations reported in marine ecosystems, with tighter coupling and interdependency between bacterioplankton and phytoplankton increasing from the coast to the open ocean (Fouilland et al, 2018;Morán et al, 2002).…”

Section: Bacterio-phytoplankton Coupling and Chemical Contaminationsupporting

confidence: 91%

“…The existence of phytoplankton-bacterioplankton coupling is supported by a significant correlation between primary production and heterotrophic bacterial production (Bouvy et al, 1998;Cole et al, 1982), but revisited more recently using a larger dataset comparing dissolved primary production and bacterial carbon demand in different aquatic ecosystems Mostajir, 2011, 2010). In coastal areas, bacteria production may or not strongly depends on phytoplankton exudates according to the availability of other sources of carbon such recycled trophic carbon sources (Fouilland et al, 2014) or external terrestrial sources (Fouilland et al, 2018;Morán et al, 2002). In these latter cases, the bacterial carbon demand can largely exceed phytoplankton production (Morán et al, 2002)The coupling between phytoplankton and bacterioplankton mediates the carbon transfer to the trophic web and consequently controls the ecosystem functioning.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of chemical contamination on bacterio-phytoplankton coupling

et al. 2020

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Phytoplankton and bacterioplankton are the key components of the organic matter cycle in aquatic ecosystems, and their interactions can impact the transfer of carbon and ecosystem functioning. The aim of this work was to assess the consequences of chemical contamination on the coupling between phytoplankton and bacterioplankton in two contrasting marine coastal ecosystems: lagoon waters and offshore waters. Bacterial carbon demand was sustained by primary carbon production in the offshore situation, suggesting a tight coupling between both compartments. In contrast, in lagoon waters, due to a higher nutrient and organic matter availability, bacteria could rely on allochthonous carbon sources to sustain their carbon requirements, decreasing so the coupling between both compartments.Exposure to chemical contaminants, pesticides and metal trace elements, resulted in a significant inhibition of the metabolic activities (primary production and bacterial carbon demand) involved in the carbon cycle, especially in offshore waters during spring and fall, inducing a significant decrease of the coupling between primary producers and heterotrophs. This coupling loss was even more evident upon sediment resuspension for both ecosystems due to the important release of nutrients and organic matter. Resulting enrichment alleviated the toxic effects of contaminants as indicated by the stimulation of phytoplankton biomass and carbon production, and modified the composition of the phytoplankton community, impacting so the interactions between phytoplankton and bacterioplankton.

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Section: Bacterio-phytoplankton Coupling and Chemical Contaminationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Impacts of chemical contamination on bacterio-phytoplankton coupling

et al. 2020

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“…Fractionation between

{HCO}_{3}^{-}

and atmospheric CO 2 increases in cold water (Zhang, Quay, & Wilbur, ) leading to 13 C enrichment of δ 13 C‐DIC values with increasing latitude (Tagliabue & Bopp, ), as observed in this study (Figure a). δ 13 C‐POC water values became 13 C‐depleted with increasing latitude (Figure b, this study; Goericke & Fry, ; McMahon et al, ), reflecting the latitudinal trend in δ 13 C‐CO 2 values as well as multiple additional factors, including temperature, phytoplankton growth rates, bacterial activity and isotopic fractionation, that also vary with latitude (Fouilland et al, ; Thomas, Kremer, Klausmeier, & Litchman, ; Young et al, ). A latitudinal trend in δ 13 C values of zooplankton was observed in the western Arctic (i.e.…”

Section: Discussionmentioning

confidence: 60%

Temporal and spatial trends in marine carbon isotopes in the Arctic Ocean and implications for food web studies

Vega

Jeffreys

Tuerena

et al. 2019

Global Change Biology

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The Arctic is undergoing unprecedented environmental change. Rapid warming, decline in sea ice extent, increase in riverine input, ocean acidification and changes in primary productivity are creating a crucible for multiple concurrent environmental stressors, with unknown consequences for the entire arctic ecosystem. Here, we synthesized 30 years of data on the stable carbon isotope (δ13C) signatures in dissolved inorganic carbon (δ13C‐DIC; 1977–2014), marine and riverine particulate organic carbon (δ13C‐POC; 1986–2013) and tissues of marine mammals in the Arctic. δ13C values in consumers can change as a result of environmentally driven variation in the δ13C values at the base of the food web or alteration in the trophic structure, thus providing a method to assess the sensitivity of food webs to environmental change. Our synthesis reveals a spatially heterogeneous and temporally evolving δ13C baseline, with spatial gradients in the δ13C‐POC values between arctic shelves and arctic basins likely driven by differences in productivity and riverine and coastal influence. We report a decline in δ13C‐DIC values (−0.011‰ per year) in the Arctic, reflecting increasing anthropogenic carbon dioxide (CO2) in the Arctic Ocean (i.e. Suess effect), which is larger than predicted. The larger decline in δ13C‐POC values and δ13C in arctic marine mammals reflects the anthropogenic CO2 signal as well as the influence of a changing arctic environment. Combining the influence of changing sea ice conditions and isotopic fractionation by phytoplankton, we explain the decadal decline in δ13C‐POC values in the Arctic Ocean and partially explain the δ13C values in marine mammals with consideration of time‐varying integration of δ13C values. The response of the arctic ecosystem to ongoing environmental change is stronger than we would predict theoretically, which has tremendous implications for the study of food webs in the rapidly changing Arctic Ocean.

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“…On the low end, Lee and Whitledge (2005) measured Canada Basin summertime NO 3 − uptake rates for phytoplankton beneath ice floes and in the open water as low as 0.021 ± 0.015 and 0.072 ± 0.072 mmol N m −3 d −1 , respectively. At the high end, NO 3 − uptake rates span three orders of magnitude, from ∼2 to 150 mmol N m −3 d −1 (Smith, 1993(Smith, , 1995Kristiansen et al, 1994;Smith et al, 1997;Fouilland et al, 2007). Our initial uptake rates varied by two orders of magnitude (0.01 -1.0 mmol N m −3 d −1 ).…”

Section: No 3 − Uptake Ratesmentioning

confidence: 77%

Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea

et al. 2018

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Major changes to Arctic marine ecosystems have resulted in longer growing seasons with increased phytoplankton production over larger areas. In the Chukchi Sea, the high productivity fuels intense benthic denitrification creating a nitrogen (N) deficit that is transported through the Arctic to the Atlantic Ocean, where it likely fuels N fixation. Given the rapid pace of environmental change and the potentially globally significant N deficit, we conducted experiments aimed at understanding phytoplankton and microbial N utilization in the Chukchi Sea. Ship-board experiments tested the effect of nitrate (NO 3 −) additions on both phytoplankton and heterotrophic prokaryote abundance, community composition, photophysiology, carbon fixation and NO 3 − uptake rates. Results support the critical role of NO 3 − in limiting summer phytoplankton communities to small cells with low production rates. NO 3 − additions increased particulate concentrations, abundance of large diatoms, and rates of carbon fixation and NO 3 − uptake by cells >1 µm. Increases in the quantum yield and electron turnover rate of photosystem II in +NO 3 − treatments suggested that phytoplankton in the ambient dissolved N environment were N starved and unable to build new, or repair damaged, reaction centers. While some increases in heterotrophic prokaryote abundance and production were noted with NO 3 − amendments, phytoplankton competition or grazers likely dampened these responses. Trends toward a warmer more stratified Chukchi Sea will likely enhance summer oligotrophic conditions and further N starve Chukchi Sea phytoplankton communities.

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Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient

Cited by 7 publications

References 56 publications

Impacts of chemical contamination on bacterio-phytoplankton coupling

Impacts of chemical contamination on bacterio-phytoplankton coupling

Temporal and spatial trends in marine carbon isotopes in the Arctic Ocean and implications for food web studies

Nitrogen Limitation of the Summer Phytoplankton and Heterotrophic Prokaryote Communities in the Chukchi Sea

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