Source Switching Maintains Dissolved Organic Matter Chemostasis Across Discharge Levels in a Large Temperate River Network

Hosen, Jacob D.; Aho, Kelly S.; Fair, Jennifer H.; Kyzivat, E. D.; Matt, Serena; Morrison, Jonathan; Stubbins, Aron; Weber, L.; Yoon, Byunghoon; Raymond, Peter A.

doi:10.1007/s10021-020-00514-7

Cited by 40 publications

(64 citation statements)

References 111 publications

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“…4, seasonal), such as primary production in spring before leaf‐out or leaf litter fall in autumn, are likely to result in stronger selection than stochastic metabolic regimes, such as one might find in prairie streams. In such prairie streams, infrequent precipitation events scour algae but also entrain terrestrial organic matter during high flow, while the draw down that follows allows for high algal production (Dodds et al 2014; Hall et al 2015; Hosen et al 2020). Thus, both the peaks of primary production and allochthonous organic matter provisions are tied to the unpredictable precipitation events (Fig.…”

Section: Synchrony Between Metabolic Regimes and Consumer Ecologymentioning

confidence: 99%

Thinking like a consumer: Linking aquatic basal metabolism and consumer dynamics

Rüegg

Conn

Anderson

et al. 2020

Limnol Oceanogr Letters

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The increasing availability of high‐frequency freshwater ecosystem metabolism data provides an opportunity to identify links between metabolic regimes, as gross primary production and ecosystem respiration patterns, and consumer energetics with the potential to improve our current understanding of consumer dynamics (e.g., population dynamics, community structure, trophic interactions). We describe a conceptual framework linking metabolic regimes of flowing waters with consumer community dynamics. We use this framework to identify three emerging research needs: (1) quantifying the linkage of metabolism and consumer production data via food web theory and carbon use efficiencies, (2) evaluating the roles of metabolic dynamics and other environmental regimes (e.g., hydrology, light) in consumer dynamics, and (3) determining the degree to which metabolic regimes influence the evolution of consumer traits and phenology. Addressing these needs will improve the understanding of consumer biomass and production patterns as metabolic regimes can be viewed as an emergent property of food webs.

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Section: Synchrony Between Metabolic Regimes and Consumer Ecologymentioning

confidence: 99%

Thinking like a consumer: Linking aquatic basal metabolism and consumer dynamics

Rüegg

Conn

Anderson

et al. 2020

Limnol Oceanogr Letters

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“…Zhang et al, 2013) and photo-oxidation (Hansen et al, 2016;Helms et al, 2008). By contrast, Freshness Index values increase with autochthonous primary and secondary production (Hosen et al, 2021), but not photo-oxidation (Hansen et al, 2016).…”

Section: Discussionmentioning

confidence: 91%

River network travel time is correlated with dissolved organic matter composition in rivers of the contiguous United States

Hosen

Allen

Amatuli

et al. 2021

Hydrological Processes

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Most terrestrial allochthonous organic matter enters river networks through headwater streams during high flow events. In headwaters, allochthonous inputs are substantial and variable, but become less important in streams and rivers with larger watersheds. As allochthonous dissolved organic matter (DOM) moves downstream, the proportion of less aromatic organic matter with autochthonous characteristics increases. How environmental factors converge to control this transformation of DOM at a continental scale is less certain. We hypothesized that the amount of time water has spent travelling through surface waters of inland systems (streams, rivers, lakes, and reservoirs) is correlated to DOM composition. To test this hypothesis, we used established river network scaling relationships to predict relative river network flow-weighted travel time (FWTT) of water for 60 stream and river sites across the contiguous United States (3090 discrete samples over 10 water years). We estimated lentic contribution to travel times with upstream in-network lake and reservoir volume. DOM composition was quantified using ultraviolet and visible absorption and fluorescence spectroscopy. A combination of FWTT and lake and reservoir volume was the best overall predictor of DOM composition among models that also incorporated discharge, specific discharge, watershed area, and upstream channel length. DOM spectral slope ratio (R 2 = 0.77) and Freshness Index (R 2 = 0.78) increased and specific ultraviolet absorbance at 254 nm (R 2 = 0.68) and Humification Index (R 2 = 0.44) decreased across sites as a function of FWTT and upstream lake volume. This indicates autochthonous-like DOM becomes continually more dominant in waters with greater FWTT. We assert that river FWTT can be used as a metric of the continuum of DOM composition from headwaters to rivers. The nature of the changes to DOM composition detected suggest this continuum is driven by a combination of photo-oxidation, biological processes, hydrologically varying terrestrial subsidies, and aged groundwater inputs.

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“…Previous studies have demonstrated that engineered headwaters may act both as locations of significant DOM processing and as sources of fresh DOM when surface‐subsurface connectivity is increased during stormwater runoff events (Fork et al., 2020). In turn, DOM found in surface canal water reflect multiple simultaneous processes, including algal and microbial production and consumption, input of fresh allochthonous DOM, and photodegradation (Hosen et al., 2020). In urban headwaters, the role of photodegradation in DOM processing is limited since flow and in‐channel storage occurs underground (Cory & Kling, 2018).…”

Section: Discussionmentioning

confidence: 99%

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

et al. 2021

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Dissolved organic matter (DOM) is a vital component of the aquatic carbon cycle and constitutes the majority of terrestrial organic carbon inputs from rivers to the ocean (Battin et al., 2008;Hedges et al., 1997). Indeed, DOM controls a range of biogeochemical processes by regulating nutrient availability and microbial activities (Coble et al., 2019;Fellman et al., 2008;Hullar et al., 2006). In coastal drainages, DOM originates from a range of allochthonous and autochthonous sources including terrestrial plants and

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Source Switching Maintains Dissolved Organic Matter Chemostasis Across Discharge Levels in a Large Temperate River Network

Cited by 40 publications

References 111 publications

Thinking like a consumer: Linking aquatic basal metabolism and consumer dynamics

Thinking like a consumer: Linking aquatic basal metabolism and consumer dynamics

River network travel time is correlated with dissolved organic matter composition in rivers of the contiguous United States

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

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