Molecular weight distribution of phosphorus fraction of aquatic dissolved organic matter

Ged, Evan C.; Boyer, Treavor H.

doi:10.1016/j.chemosphere.2013.01.113

Cited by 38 publications

(17 citation statements)

References 33 publications

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“…We found that lake browning was characterised by increased DOM quantity and shifts towards more refractory DOM (higher SUVA) and darker water colour (McKnight et al, 2003). We also found that browning was associated with increases in TP and shifts towards meso-and eutrophic status, suggesting that DOM acts as a nutrient vector (Ged & Boyer, 2013), or that the processes that drive increases in DOM (e.g. hydrologic intensification, Senar, Webster, & Creed, 2018) additional refractory DOM inputs led to shifts in phytoplankton communities; while green algae responded positively to higher DOM quantity, cyanobacteria responded positively to shifts in water colour (i.e.…”

Section: Discussionmentioning

confidence: 52%

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Browning reduces the availability—but not the transfer—of essential fatty acids in temperate lakes

et al. 2019

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Atmospheric changes are leading to the browning of northern lakes (i.e. increases in catchment‐derived dissolved organic matter [DOM]), consequently altering phytoplankton biomass and community composition. We hypothesised that lake browning and the concurrent increase in nutrients drive a shift towards greater cyanobacteria biomass. We further hypothesised that, as a consequence of this shift in phytoplankton, the content of ω‐3 (n‐3) essential fatty acids (EFA) in seston would decline, affecting the subsequent transfer of EFA to consumers across the plant–animal interface in pelagic regions of lakes. We tested these hypotheses in the epilimnion of 30 temperate lakes in Ontario (Canada), representing a gradient of lake browning, with dissolved organic carbon (DOC) ranging from 2 to 10 mg/L and total phosphorus ranging from 6.0 to 48.5 μg/L. In each of these lakes, the concentration and composition of DOM, the biomass of phytoplankton and cyanobacteria, and the EFA content of seston, cladocerans, and copepods were measured. An increase in aromatic DOM was associated with increased phytoplankton and cyanobacteria biomass. Due to the lower content of the EFA eicosapentaenoic acid (EPA; 20:5n‐3) and docosahexaenoic acid (DHA; 22:6n‐3) in cyanobacteria, this increase in phytoplankton biomass was associated with a decline in EPA and DHA content in lake seston. However, there was no significant change in EFA content of cladocerans and copepods. This homeostatic (diet‐independent) EFA composition in zooplankton suggested that, as the phytoplankton community shifted towards more cyanobacteria with lower EFA content, the cladocerans and copepods may have met their nutritional requirements by relying on alternative food sources (e.g. heterotrophic ciliates and flagellates) capable of either trophically upgrading phytoplankton‐produced EPA and DHA, or synthesising EPA and DHA de novo. Results from this study indicate that increasing DOC from low (2 mg DOC/L) to moderate levels (15 mg DOC/L) may increase the importance of the microbial pathway in the trophic transfer of EPA and DHA from basal resources to zooplankton. However, this supplementary transfer of EFA through the microbial food web may not sustain high EPA and DHA levels in zooplankton when lake browning starts to limit primary production (>15 mg DOC/L).

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Section: Discussionmentioning

confidence: 52%

“…In addition, allochthonous DOM can function as an energy (C) and nutrient (nitrogen [N], phosphorus [P], iron [Fe]) source for primary producers (Ged & Boyer, 2013); however, the bioavailability of the increased nutrient pool declines with shifts to more refractory DOM (Findlay, 2003;Soares et al, 2017;Sorichetti, Creed, & Trick, 2016).…”

Section: Introductionmentioning

confidence: 99%

Browning reduces the availability—but not the transfer—of essential fatty acids in temperate lakes

et al. 2019

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“…141This presents a major obstacle for meeting ultralow P goals. (143,144) Additionally, internal processes can play a considerable role in aquatic systems, (145) as illustrated by the more consistent interior TP levels in spite of more dramatic variation in inflows and outflows. In a unique approach to tackling the ongoing challenge of achieving ultralow P levels in the Everglades, the US $10 million George Barley Water Prize was launched in 2016.…”

Section: Everglades Florida: Integrated Source and Sink Approaches Fmentioning

confidence: 99%

Managing Diffuse Phosphorus at the Source versus at the Sink

Macintosh

Mayer

McDowell

et al. 2018

Environ. Sci. Technol.

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“…DOM in lakes may originate from the surrounding catchment (allochthonous) or be produced within the lake (autochthonous). While the primary component of DOM is carbon (C), it also contains macronutrients such as nitrogen (N) and phosphorus (P), micronutrients such as iron (Fe), as well as toxins and contaminants such as mercury (Hg) (Ged & Boyer, 2013;Maranger & Pullin, 2003;Qualls & Richardson, 2003;Ravichandran, 2004). As DOM is transported in percolating and running waters, climatic and environmental factors operating within watersheds influence its compositional diversity (Battin et al, 2008;Hedin, Armesto, & Johnson, 1995;Manzoni & Porporato, 2011).…”

Section: Introductionmentioning

confidence: 99%

Global change‐driven effects on dissolved organic matter composition: Implications for food webs of northern lakes

Creed

Bergström

Trick

et al. 2018

Global Change Biology

262

213

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Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM)-the messenger between terrestrial and lake ecosystems-with potentially profound effects on the structure and function of lakes. Northern terrestrial ecosystems contain substantial stores of organic matter and filter or funnel DOM, affecting the timing and magnitude of DOM delivery to surface waters. This terrestrial DOM is processed in streams, rivers, and lakes, ultimately shifting its composition, stoichiometry, and bioavailability. Here, we explore the potential consequences of these global change-driven effects for lake food webs at northern latitudes. Notably, we provide evidence that increased allochthonous DOM supply to lakes is overwhelming increased autochthonous DOM supply that potentially results from earlier ice-out and a longer growing season. Furthermore, we assess the potential implications of this shift for the nutritional quality of autotrophs in terms of their stoichiometry, fatty acid composition, toxin production, and methylmercury concentration, and therefore, contaminant transfer through the food web. We conclude that global change in northern regions leads not only to reduced primary productivity but also to nutritionally poorer lake food webs, with discernible consequences for the trophic web to fish and humans.

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Molecular weight distribution of phosphorus fraction of aquatic dissolved organic matter

Cited by 38 publications

References 33 publications

Browning reduces the availability—but not the transfer—of essential fatty acids in temperate lakes

Browning reduces the availability—but not the transfer—of essential fatty acids in temperate lakes

Managing Diffuse Phosphorus at the Source versus at the Sink

Global change‐driven effects on dissolved organic matter composition: Implications for food webs of northern lakes

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