Plankton networks driving carbon export in the oligotrophic ocean

Nature, Journal Year: 2016, Volume and Issue: 532(7600), P. 465 - 470

Published: Feb. 10, 2016

Language: Английский

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Eco-physiological adaptations that favour freshwater cyanobacteria in a changing climate

Water Research, Journal Year: 2011, Volume and Issue: 46(5), P. 1394 - 1407

Published: Dec. 16, 2011

Language: Английский

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The C:N:P stoichiometry of organisms and ecosystems in a changing world: A review and perspectives

Perspectives in Plant Ecology Evolution and Systematics, Journal Year: 2011, Volume and Issue: 14(1), P. 33 - 47

Published: Oct. 2, 2011

Language: Английский

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Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

Limnology and Oceanography, Journal Year: 2015, Volume and Issue: 61(1), P. 165 - 197

Published: Oct. 11, 2015

Anthropogenic activities are altering total nutrient loads to many estuaries and freshwaters, resulting in high not only of nitrogen (N), but some cases, chemically reduced forms, notably . Long thought be the preferred form N for phytoplankton uptake, may actually suppress overall growth when concentrations sufficiently high. has been well known inhibitory or repressive uptake assimilation, that promote vs. repress different groups under conditions understood. Here, we review metabolism first a "generic" eukaryotic cell, contrasting metabolic pathways regulation these substrates provided individually equivalent conditions. Then interactions described both together, emphasizing cellular challenge balancing acquisition with photosynthetic energy balance dynamic environments. Conditions which dissipatory such as dissimilatory / reduction photorespiration lead suppression highlighted. While more is about diatoms, taxon-specific differences contribute changes community composition pool presented. These relationships have important implications harmful algal blooms, development criteria management, modeling by phytoplankton, particularly where eutrophication increasing redox state changing.

Language: Английский

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Eutrophication, harmful algae and biodiversity — Challenging paradigms in a world of complex nutrient changes

Marine Pollution Bulletin, Journal Year: 2017, Volume and Issue: 124(2), P. 591 - 606

Published: April 25, 2017

Language: Английский

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Cell Size as a Key Determinant of Phytoplankton Metabolism and Community Structure

Annual Review of Marine Science, Journal Year: 2014, Volume and Issue: 7(1), P. 241 - 264

Published: July 25, 2014

Phytoplankton size structure controls the trophic organization of planktonic communities and their ability to export biogenic materials toward ocean's interior. Our understanding mechanisms that drive variability in phytoplankton has been shaped by assumption pace metabolism decreases allometrically with increasing cell size. However, recent field laboratory evidence indicates biomass-specific production growth rates are similar both small large cells but peak at intermediate sizes. The maximum nutrient uptake rate scales isometrically volume superisometrically minimum quota. unimodal scaling arises from ataxonomic, size-dependent trade-off processes related requirement, acquisition, use. superior intermediate-size exploit high concentrations explains biomass dominance during blooms. Biogeographic patterns independent temperature driven mainly changes resource supply.

Language: Английский

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Dissolved organic matter (DOM) release by phytoplankton in the contemporary and future ocean

European Journal of Phycology, Journal Year: 2014, Volume and Issue: 49(1), P. 20 - 46

Published: Jan. 2, 2014

The partitioning of organic matter (OM) between dissolved and particulate phases is an important factor in determining the fate carbon ocean. Dissolved (DOM) release by phytoplankton a ubiquitous process, resulting 2–50% fixed photosynthesis leaving cell. This loss can be divided into two components: passive leakage diffusion across cell membrane active exudation DOM surrounding environment. At present there no method to distinguish whether released via or exudation. Most explanations for remain hypothetical; as while has been measured extensively, relatively little work determine why released. Further research needed composition link physiological status environmental conditions. For example, causes physiology death are poorly understood, though increases permeability presumably release. Recent shown that interactions with bacteria both amount In response increasing CO2 atmosphere, climate change creating increasingly stressful conditions surface ocean, including warm water, low pH, nutrient supply high light. As ocean physics chemistry change, it hypothesized greater proportion primary production will directly water DOM. Changes have bottom-up effects on ecosystem structure function. There need how these changes affect particularly efficiency biological pump.

Language: Английский

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Microorganisms and ocean global change

Nature Microbiology, Journal Year: 2017, Volume and Issue: 2(6)

Published: May 24, 2017

Language: Английский

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Southern Ocean Phytoplankton in a Changing Climate

Frontiers in Marine Science, Journal Year: 2017, Volume and Issue: 4

Published: Feb. 16, 2017

Phytoplankton are the base of Antarctic food web, sustain wealth and diversity life for which Antarctica is renowned, play a critical role in biogeochemical cycles that mediate global climate. Over vast expanse Southern Ocean (SO), climate variously predicted to experience increased warming, strengthening wind, acidification, shallowing mixed layer depths, light (and UV), changes upwelling nutrient replenishment, declining sea ice, reduced salinity, southward migration ocean fronts. These expected alter structure function phytoplankton communities SO. The diverse environments contained within SO will be impacted differently by change; causing identity magnitude environmental factors driving biotic change vary among bioregions. Predicting net effect multiple climate-induced stressors over range complex. Yet understanding response vital if we predict future state/s ecosystem, estimate impacts on fisheries endangered species, accurately effects physical This review looks at major define SO, examines forecast environment, predicts likely these phytoplankton, considers ramifications trophodynamics feedbacks change. Predictions strongly suggest all regions productivity community composition with nature, even sign, varies depend upon sequence imposed. It affect biogeochemistry, carbon export, nutrition higher trophic levels.

Language: Английский

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Harmful algae at the complex nexus of eutrophication and climate change

Harmful Algae, Journal Year: 2019, Volume and Issue: 91, P. 101583 - 101583

Published: June 20, 2019

Climate projections suggest-with substantial certainty-that global warming >1.5 °C will occur by mid-century (2050). Population is also projected to increase, amplifying the demands for food, fuel, water and sanitation, which, in turn, escalate nutrient pollution. Global of pollution, however, are less certain than those climate as there regionally decreasing trends Europe, stabilization use North America Australia. In this review effects eutrophication on harmful algae, some complex, subtle, non-intuitive interactions physiology both non-harmful taxa emphasized. a future ocean, diatoms may be disproportionately stressed mixotrophs advantaged due changing stoichiometry forms nutrients, temperature, stratification oceanic pH. Modeling advancing, but much yet understood, terms physiology, biogeochemistry trophodynamics how nonharmful change an uncertain driven anthropogenic activities.

Language: Английский

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