Seasonal variation in benthic community oxygen demand: A response to an ice algal bloom in the Beaufort Sea, Canadian Arctic?

Renaud, Paul E.; Riedel, Andrea; Michel, Christine; Morata, Nathalie; Gosselin, Michel; Juul-Pedersen, Thomas; Chiuchiolo, Amy

doi:10.1016/j.jmarsys.2006.07.006

Cited by 126 publications

(101 citation statements)

References 58 publications

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“…The present study conWrms that inputs of ice algae to the sediment increased from January/February to April/May and are a source of organic matter to the benthos, as suggested by Renaud et al (2007). The following discussion in organized as an evaluation of the three hypotheses.…”

Section: Discussionsupporting

confidence: 72%

“…While the total SOD increased by an order of magnitude from January/February to April/May, the minivial SOD only varied by a factor of two ( Fig. 3a in Renaud et al 2007). The overall ratio of the total SOD:minivial SOD increased through time (Fig.…”

Section: Surface Sedimentary Pigments and Stable Isotopesmentioning

confidence: 88%

“…3a). In order to compare pigment degradation products with benthic activities, the ratio of total community SOD to bacteria/meiofaunal oxygen demand ("minivial" SOD) was calculated from Renaud et al (2007). While the total SOD increased by an order of magnitude from January/February to April/May, the minivial SOD only varied by a factor of two ( Fig.…”

Section: Surface Sedimentary Pigments and Stable Isotopesmentioning

confidence: 99%

“…Ice algal biomass and downward Xuxes of particulate organic material increased from the winter to the spring season (Riedel et al 2006;Rórajska et al 2009). Sediment oxygen demand (SOD), a measure of labile carbon processed by the benthic community, also increased in April, as a response to an increase in ice algal phytodetritus inputs (Renaud et al 2007). Unexpectedly, no increase in sedimentary chl a was observed, leading to the question of whether an input of ice algal phytodetritus to the sea Xoor always leads to an increase in sedimentary pigments.…”

Section: Introductionmentioning

confidence: 99%

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A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

2010

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Section: Discussionsupporting

confidence: 72%

Section: Surface Sedimentary Pigments and Stable Isotopesmentioning

confidence: 88%

Section: Surface Sedimentary Pigments and Stable Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

2010

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“…Ophiuroids, capitellid polychaetes and other opportunists may be favored by increased sediment inputs. In deep Arctic fjords, high sediment fluxes already create large areas of burial disturbance, which can negatively impact trophic complexity, diversity and productivity of benthic assemblages while also inducing O 2 stress (Syvitski, 1989;Włodarska-Kowalczuk et al, 2005;Renaud et al, 2007). In time, continued warming will reduce sediment fluxes into many high-latitude fjords as a result of glacial retreat onto land, potentially increasing benthic productivity and biodiversity .…”

Section: The Polar Deep Seasmentioning

confidence: 99%

Major impacts of climate change on deep-sea benthic ecosystems

Sweetman

Thurber

Smith

et al. 2017

Elementa: Science of the Anthropocene

282

297

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The deep sea encompasses the largest ecosystems on Earth. Although poorly known, deep seafloor ecosystems provide services that are vitally important to the entire ocean and biosphere. Rising atmospheric greenhouse gases are bringing about significant changes in the environmental properties of the ocean realm in terms of water column oxygenation, temperature, pH and food supply, with concomitant impacts on deep-sea ecosystems. Projections suggest that abyssal (3000-6000 m) ocean temperatures could increase by 1°C over the next 84 years, while abyssal seafloor habitats under areas of deep-water formation may experience reductions in water column oxygen concentrations by as much as 0.03 mL L -1 by 2100. Bathyal depths (200-3000 m) worldwide will undergo the most significant reductions in pH in all oceans by the year 2100 (0.29 to 0.37 pH units). O 2 concentrations will also decline in the bathyal NE Pacific and Southern Oceans, with losses up to 3.7% or more, especially at intermediate depths. Another important environmental parameter, the flux of particulate organic matter to the seafloor, is likely to decline significantly in most oceans, most notably in the abyssal and bathyal Indian Ocean where it is predicted to decrease by 40-55% by the end of the century. Unfortunately, how these major changes will affect deep-seafloor ecosystems is, in some cases, very poorly understood. In this paper, we provide a detailed overview of the impacts of these changing environmental parameters on deep-seafloor ecosystems that will most likely be seen by 2100 in continental margin, abyssal and polar settings. We also consider how these changes may combine with other anthropogenic stressors (e.g., fishing, mineral mining, oil and gas extraction) to further impact deep-seafloor ecosystems and discuss the possible societal implications.

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Organic matter remineralization in marine sediments: A Pan‐Arctic synthesis

Bourgeois

Archambault

Witte

2017

Global Biogeochemical Cycles

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Climate change in the Arctic is ongoing and causes drastic modification on the ecosystem functioning. In soft-bottom environments, organic matter remineralization is considered an important ecosystem function. Here we provide a large-scale assessment of the current knowledge on the benthic organic matter remineralization and its potential response to climate change. Sediment oxygen demand (SOD) values (n = 1154), measured throughout the Arctic, were gathered from 30 publications and 16 databases, and nutrient flux values, available in a far lesser extent (n < 80), were also compiled. Generalized additive models were used to estimate the influence of explanatory variables on benthic oxygen fluxes and for interpolating SOD to the whole Arctic region. This first Pan-Arctic review of the distributions of SOD showed that oxygen fluxes strongly depended on water depth, i.e., followed the general trend observed for other regions, and also on the availability of labile organic matter. The continental shelves (representing~50% of Arctic Ocean's total area) were characterized by the highest SOD values (10.5 ± 7.9 mmol O 2 m À2 d À1 ), and differences among shelves were observed; SOD values in inflow, interior, and outflow shelves were 11.8 ± 8.0, 6.2 ± 5.6, and 3.9 ± 3.5 mmol O 2 m À2 d À1 , respectively. Moreover, seasonal variation in SOD changed significantly among areas. The interpolation based on the best fitted model showed high respiration in the inflow and interior shelves. In the inflow shelves, characterized by productive waters, benthic activities replenish bottom water with nutrients which may augment primary productivity, whereas sediments from the interior shelves, e.g., under the direct influence of the Mackenzie River, consume nutrients.

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Seasonal variation in benthic community oxygen demand: A response to an ice algal bloom in the Beaufort Sea, Canadian Arctic?

Cited by 126 publications

References 58 publications

A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

A multiple biomarker approach to tracking the fate of an ice algal bloom to the sea floor

Major impacts of climate change on deep-sea benthic ecosystems

Organic matter remineralization in marine sediments: A Pan‐Arctic synthesis

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