Profile

Affiliate Professor.
Exploring the function of inland water networks.
Publications
Vachon, Dominic; Sponseller, Ryan A; Karlsson, Jan
Integrating carbon emission, accumulation and transport in inland waters to understand their role in the global carbon cycle Journal Article
In: Global Change Biology, vol. 27, no. 4, pp. 719-727, 2021.
@article{https://doi.org/10.1111/gcb.15448,
title = {Integrating carbon emission, accumulation and transport in inland waters to understand their role in the global carbon cycle},
author = {Dominic Vachon and Ryan A Sponseller and Jan Karlsson},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.15448},
doi = {https://doi.org/10.1111/gcb.15448},
year = {2021},
date = {2021-01-01},
journal = {Global Change Biology},
volume = {27},
number = {4},
pages = {719-727},
abstract = {Abstract Inland waters receive a significant quantity of carbon (C) from land. The fate of this C during transit, whether it is emitted to the atmosphere, accumulated in sediments or transported to the ocean, can considerably reshape the landscape C balance. However, these different fates of terrestrial C are not independent but are instead linked via several catchment and aquatic processes. Thus, according to mass conservation, any environmental change inducing a shift in a particular C fate should come at the expense of at least one other fate. Nonetheless, studies that have investigated C emission, accumulation and transport concertedly are scarce, resulting in fragmented knowledge of the role of inland waters in the global C cycle. Here, we propose a framework to understand how different C fates in aquatic systems are interlinked and covary under environmental changes. First, to explore how C fates are currently distributed in streams, rivers, reservoirs and lakes, we compiled data from the literature and show that ‘C fate allocation’ varies widely both within and among inland water systems types. Secondly, we developed a framework that integrates C fates in any inland water system by identifying the key processes underlying their linkages. Our framework places the partitioning between the different C forms, and how this is controlled by export from land, internal transformations and hydrology, as central to understanding C fate allocation. We argue that, by focusing on a single fate, studies could risk drawing misleading conclusions regarding how environmental changes will alter the role of inland waters in the global C cycle. Our framework thus allows us to holistically assess the consequences of such changes on coupled C fluxes, setting a foundation for understanding the contemporary and future fate of land-derived C in inland water systems.},
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pubstate = {published},
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}
Vachon, Dominic; Sadro, Steven; Bogard, Matthew J; Lapierre, Jean-François; Baulch, Helen M; Rusak, James A; Denfeld, Blaize A; Laas, Alo; Klaus, Marcus; Karlsson, Jan; Weyhenmeyer, Gesa A; del Giorgio, Paul A
Paired O2–CO2 measurements provide emergent insights into aquatic ecosystem function Journal Article
In: Limnology and Oceanography Letters, vol. 5, no. 4, pp. 287-294, 2020.
@article{https://doi.org/10.1002/lol2.10135,
title = {Paired O2–CO2 measurements provide emergent insights into aquatic ecosystem function},
author = {Dominic Vachon and Steven Sadro and Matthew J Bogard and Jean-François Lapierre and Helen M Baulch and James A Rusak and Blaize A Denfeld and Alo Laas and Marcus Klaus and Jan Karlsson and Gesa A Weyhenmeyer and Paul A del Giorgio},
url = {https://aslopubs.onlinelibrary.wiley.com/doi/abs/10.1002/lol2.10135},
doi = {https://doi.org/10.1002/lol2.10135},
year = {2020},
date = {2020-01-01},
journal = {Limnology and Oceanography Letters},
volume = {5},
number = {4},
pages = {287-294},
abstract = {Scientific Significance Statement Metabolic stoichiometry predicts that dissolved oxygen (O2) and carbon dioxide (CO2) in aquatic ecosystems should covary inversely; however, field observations often diverge from theoretical expectations. Here, we propose a suite of metrics describing this O2 and CO2 decoupling and introduce a conceptual framework for interpreting these metrics within aquatic ecosystems. Within this framework, we interpret cross-system patterns of high-frequency O2 and CO2 measurements in 11 northern lakes and extract emergent insights into the metabolic behavior and the simultaneous roles of chemical and physical forcing in shaping ecosystem processes. This approach leverages the power of high-frequency paired O2–CO2 measurements, and yields a novel, integrative aquatic system typology which can also be applicable more broadly to streams and rivers, wetlands and marine systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vasconcelos, Francisco Rivera; Diehl, Sebastian; Rodríguez, Patricia; Hedström, Per; Karlsson, Jan; Byström, Pär
Bottom-up and top-down effects of browning and warming on shallow lake food webs Journal Article
In: Global Change Biology, vol. 25, no. 2, pp. 504-521, 2019.
@article{doi:10.1111/gcb.14521,
title = {Bottom-up and top-down effects of browning and warming on shallow lake food webs},
author = {Francisco Rivera Vasconcelos and Sebastian Diehl and Patricia Rodríguez and Per Hedström and Jan Karlsson and Pär Byström},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.14521},
doi = {10.1111/gcb.14521},
year = {2019},
date = {2019-01-01},
journal = {Global Change Biology},
volume = {25},
number = {2},
pages = {504-521},
abstract = {Abstract Productivity and trophic structure of aquatic ecosystems result from a complex interplay of bottom-up and top-down forces that operate across benthic and pelagic food web compartments. Projected global changes urge the question how this interplay will be affected by browning (increasing input of terrestrial dissolved organic matter), nutrient enrichment and warming. We explored this with a process-based model of a shallow lake food web consisting of benthic and pelagic components (abiotic resources, primary producers, grazers, carnivores), and compared model expectations with the results of a browning and warming experiment in nutrient-poor ponds harboring a boreal lake community. Under low nutrient conditions, the model makes three major predictions. (a) Browning reduces light and increases nutrient supply; this decreases benthic and increases pelagic production, gradually shifting productivity from the benthic to the pelagic habitat. (b) Because of active habitat choice, fish exert top-down control on grazers and benefit primary producers primarily in the more productive of the two habitats. (c) Warming relaxes top-down control of grazers by fish and decreases primary producer biomass, but effects of warming are generally small compared to effects of browning and nutrient supply. Experimental results were consistent with most model predictions for browning: light penetration, benthic algal production, and zoobenthos biomass decreased, and pelagic nutrients and pelagic algal production increased with browning. Also consistent with expectations, warming had negative effects on benthic and pelagic algal biomass and weak effects on algal production and zoobenthos and zooplankton biomass. Inconsistent with expectations, browning had no effect on zooplankton and warming effects on fish depended on browning. The model is applicable also to nutrient-rich systems, and we propose that it is a useful tool for the exploration of the consequences of different climate change scenarios for productivity and food web dynamics in shallow lakes, the worldwide most common lake type.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Diehl, Sebastian; Thomsson, Gustaf; Kahlert, Maria; Guo, Junwen; Karlsson, Jan; Liess, Antonia
Inverse relationship of epilithic algae and pelagic phosphorus in unproductive lakes: Roles of N2 fixers and light Journal Article
In: Freshwater Biology, 2018.
@article{diehlinverse,
title = {Inverse relationship of epilithic algae and pelagic phosphorus in unproductive lakes: Roles of N2 fixers and light},
author = {Sebastian Diehl and Gustaf Thomsson and Maria Kahlert and Junwen Guo and Jan Karlsson and Antonia Liess},
doi = {https://doi.org/10.1111/fwb.13103},
year = {2018},
date = {2018-03-30},
journal = {Freshwater Biology},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vasconcelos, Francisco Rivera; Diehl, Sebastian; Rodríguez, Patricia; Karlsson, Jan; Byström, Pär
Effects of Terrestrial Organic Matter on Aquatic Primary Production as Mediated by Pelagic--Benthic Resource Fluxes Journal Article
In: Ecosystems, pp. 1–14, 2018.
@article{vasconceloseffects,
title = {Effects of Terrestrial Organic Matter on Aquatic Primary Production as Mediated by Pelagic--Benthic Resource Fluxes},
author = {Francisco Rivera Vasconcelos and Sebastian Diehl and Patricia Rodríguez and Jan Karlsson and Pär Byström},
doi = {https://doi.org/10.1007/s10021-017-0217-x},
year = {2018},
date = {2018-01-17},
journal = {Ecosystems},
pages = {1--14},
publisher = {Springer US},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vasconcelos, Francisco Rivera; Diehl, Sebastian; Rodríguez, Patricia; Hedström, Per; Karlsson, Jan; Byström, Pär
Asymmetrical competition between aquatic primary producers in a warmer and browner world Journal Article
In: Ecology, vol. 97, no. 10, pp. 2580–2592, 2016.
@article{vasconcelos2016asymmetrical,
title = {Asymmetrical competition between aquatic primary producers in a warmer and browner world},
author = {Francisco Rivera Vasconcelos and Sebastian Diehl and Patricia Rodríguez and Per Hedström and Jan Karlsson and Pär Byström},
doi = {https://doi.org/10.1002/ecy.1487},
year = {2016},
date = {2016-01-01},
journal = {Ecology},
volume = {97},
number = {10},
pages = {2580--2592},
publisher = {Ecological Society of America},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hotchkiss, E R; Jr, Hall R O; Sponseller, R A; Butman, D; Klaminder, J; Laudon, H; Rosvall, Martin; Karlsson, Jan
Sources of and processes controlling CO2 emissions change with the size of streams and rivers Journal Article
In: Nature Geoscience, vol. 8, no. 9, pp. 696–699, 2015.
@article{Hotchkiss_2015,
title = {Sources of and processes controlling CO2 emissions change with the size of streams and rivers},
author = {E R Hotchkiss and Hall R O Jr and R A Sponseller and D Butman and J Klaminder and H Laudon and Martin Rosvall and Jan Karlsson},
url = {https://doi.org/10.1038%2Fngeo2507},
doi = {10.1038/ngeo2507},
year = {2015},
date = {2015-08-01},
journal = {Nature Geoscience},
volume = {8},
number = {9},
pages = {696--699},
publisher = {Springer Nature},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
I am a Professor in physical geography with a focus on aquatic biogeochemistry. My research focus on impacts of climate change on the biogeochemistry and ecology of high latitude aquatic ecosystems. Part of the research study the magnitude and control of greenhouse gas exchange and carbon burial in aquatic systems, and another part study the control of productivity and resources use in food webs. The research includes mainly boreal-arctic lakes and streams/rivers and is based on a range of approaches, including comparative studies along climate and permafrost gradients, experimental studies where different environmental stressors are manipulated, and modelling.
Current Projects
Climate impact on the inland water carbon cycle (The Kempe Foundations)
Jan Karlsson, Martin Rosvall, Hjalmar Laudon, Lina Polvi Sjöberg, Dominic Vachon
Climate change induced regime shifts in Northern lake ecosystems (Knut and Alice Wallenberg Foundation)
Jan Karlsson, David Bastviken, Ann-Kristin Bergström, Christian Bigler, Richard Bindler, Åke Brännström, Pär Byström, Sebastian Diehl, Isabelle Domaizon, Göran Englund, Cristian Gudasz, Dag Hessen, Jonatan Klaminder, Sally MacIntyre, Frank Peeters, André de Roos, Martin Rosvall, David Seekell, Ryan Sponseller, Xiau-Ru Wang
Climate impact on sources and sinks of greenhouse gases in high-latitude lakes (The Swedish Research Council, VR)
Jan Karlsson, David Bastviken, Cristian Gudasz, Jonatan Klaminder, Sally MacIntyre, Oleg Pokrovsky, Chris Soulsby, Hendricus Verheijen
Impact of forestry on greenhouse gas release from streams (FORMAS)
Jan Karlsson, Elisabeth Andersson, Anders Eriksson, Erin Hotchkiss, Marcus Klaus, Hjalmar Laudon, Ryan Sponseller, Demian Hauptmann
The Latest Posts
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