Integrating ecosystem metabolism and consumer allochthony reveals nonlinear drivers in lake organic matter processing

Holgerson, Meredith A.; Hovel, Rachel A.; Kelly, Patrick T.; Bortolotti, Lauren E.; Brentrup, Jennifer A.; Bellamy, Amber R.; Oliver, Samantha; Reisinger, Alexander J.

doi:10.1002/lno.11907

Cited by 5 publications

(1 citation statement)

References 70 publications

(121 reference statements)

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“…Studies in this volume provide both examples of, and approaches to, documenting nonlinear patterns using comparative data as well as modeling. Holgerson et al (2022) use a large compilation of data from lakes to document nonlinear patterns between two drivers-nutrients and dissolved organic matter-and three processes-gross primary production, ecosystem respiration, and consumer allochthony. Another comparative study indicates the joint and complex impacts of nutrient enrichment and fish predation on zooplankton community diversity and network structure (Li et al 2022).…”

mentioning

confidence: 99%

Nonlinear dynamics, resilience, and regime shifts in aquatic communities and ecosystems: an overview

Seekell

Pace

Heffernan

et al. 2022

Limnology & Oceanography

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mentioning

confidence: 99%

Nonlinear dynamics, resilience, and regime shifts in aquatic communities and ecosystems: an overview

Seekell

Pace

Heffernan

et al. 2022

Limnology & Oceanography

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Resolving the Drivers of Algal Nutrient Limitation from Boreal to Arctic Lakes and Streams

et al. 2022

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Nutrient inputs to northern freshwaters are changing, potentially altering aquatic ecosystem functioning through effects on primary producers. Yet, while primary producer growth is sensitive to nutrient supply, it is also constrained by a suite of other factors, including light and temperature, which may play varying roles across stream and lake habitats. Here, we use bioassay results from 89 lakes and streams spanning northern boreal to Arctic Sweden to test for differences in nutrient limitation status of algal biomass along gradients in colored dissolved organic carbon (DOC), water temperature, and nutrient concentrations, and to ask whether there are distinct patterns and drivers between habitats. Single nitrogen (N) limitation or primary N-limitation with secondary phosphorus (P) limitation of algal biomass was the most common condition for streams and lakes. Average response to N-addition was a doubling in biomass; however, the degree of limitation was modulated by the distinct physical and chemical conditions in lakes versus streams and across boreal to Arctic regions. Overall, algal responses to N-addition were strongest at sites with low background concentrations of dissolved inorganic N. Low temperatures constrained biomass responses to added nutrients in lakes but had weaker effects on responses in streams. Further, DOC mediated the response of algal biomass to nutrient addition differently among lakes and streams. Stream responses were dampened at higher DOC, whereas lake responses to nutrient addition increased from low to moderate DOC but were depressed at high DOC. Our results suggest that future changes in nutrient availability, particularly N, will exert strong effects on the trophic state of northern freshwaters. However, we highlight important differences in the physical and chemical factors that shape algal responses to nutrient availability in different parts of aquatic networks, which will ultimately affect the integrated response of northern aquatic systems to ongoing environmental changes.

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Freshwater Biogeochemical Hotspots: High Primary Production and Ecosystem Respiration in Shallow Waterbodies

Rabaey,

Holgerson,

Richardson

et al. 2024

Geophysical Research Letters

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Ponds, wetlands, and shallow lakes (collectively “shallow waterbodies”) are among the most biogeochemically active freshwater ecosystems. Measurements of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) are rare in shallow waterbodies compared to larger and deeper lakes, which can bias our understanding of lentic ecosystem processes. In this study, we calculated GPP, R, and NEP in 26 small, shallow waterbodies across temperate North America and Europe. We observed high rates of GPP (mean 8.4 g O2 m−3 d−1) and R (mean −9.1 g O2 m−3 d−1), while NEP varied from net heterotrophic to autotrophic. Metabolism rates were affected by depth and aquatic vegetation cover, and the shallowest waterbodies had the highest GPP, R, and the most variable NEP. The shallow waterbodies from this study had considerably higher metabolism rates compared to deeper lakes, stressing the importance of these systems as highly productive biogeochemical hotspots.

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Integrating ecosystem metabolism and consumer allochthony reveals nonlinear drivers in lake organic matter processing

Cited by 5 publications

References 70 publications

Nonlinear dynamics, resilience, and regime shifts in aquatic communities and ecosystems: an overview

Nonlinear dynamics, resilience, and regime shifts in aquatic communities and ecosystems: an overview

Resolving the Drivers of Algal Nutrient Limitation from Boreal to Arctic Lakes and Streams

Freshwater Biogeochemical Hotspots: High Primary Production and Ecosystem Respiration in Shallow Waterbodies

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