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Umeå universitet
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Huvudmenyn dold.
Personalbild Ann-Kristin Bergström

Ann-Kristin Bergström

Min forskning berör effekter av miljö- och klimatförändringar på nordliga akvatiska ekosystems produktivitet och födovävsstruktur.

Vetenskaplig meritering: Docent
0000-0001-5102-4289

Kontakt

E-post
ann-kristin.bergstrom@umu.se
Telefon
090-786 95 44, 070-274 77 34

Verksam som

Anknytning
Professor vid Institutionen för ekologi, miljö och geovetenskap
Plats
KBC-Fysiologihuset, Linnaeus väg 6, Umeå, A3 38 21 Umeå universitet, 901 87 Umeå

Särskilt fokus i min forskning är att studera betydelsen av organiskt material (humusämnen), näringsämnen (kväve och fosfor) och kalcium för sjöars produktivitet och födovävsstruktur. Mina nuvarande forskningsprojekt handlar om hur globala klimatförändringar påverkar sjöars biogeokemi, och vilka eventuella konsekvenser biogeokemiska förändringar har på nordliga sjöars produktivitet och ekosystemtjänster. Vi utvärderar hur tillgång av kalcium, och näring, samt N: P stökiometri i sjöar påverkas av förändringar i atmosfärisk kvävedeposition och klimat och vilka effekter detta får på näringsbegränsning av växtplankton och djurplankton, näringsregenerering, fettsyretillgång och trofisk överföringseffektivitet, samt produktivitet i nordliga boreala och subarktiska sjöar. Olika angreppssätt används, inklusive sjöundersökningar och experimentella metoder som integreras med studier av långsiktiga övervakningsdata av sjöar och satellitdata tillsammans med modellering och maskininlärning.

Does dissolved organic matter composition help explain the concentrations of bioavailable macronutrients in organic matter-rich freshwaters?
Freshwater Biology, John Wiley & Sons 2025, Vol. 70, (11)
Berggren, Martin; Rulli, Mayra P. D.; Bergström, Ann-Kristin; et al.
Impacts of atmospheric nitrogen deposition and lake browning on planktonic biomass ratios and nutrient accumulation in northern lakes
Hydrobiologia, Springer Nature 2025, Vol. 853 : 719-737
Bergström, Ann-Kristin; Creed, Irena F.; Jonsson, Anders; et al.
Temporal decoupling between total organic carbon and iron in lakes linked to interannual changes in precipitation
Global Biogeochemical Cycles, American Geophysical Union (AGU) 2025, Vol. 39, (10)
Palstev, Aleksey; Creed, Irena F.; Hessen, Dag O.; et al.
Impacts of hypoxia on boreal lake biogeochemistry and productivity: a 4-year whole-ecosystem BACI experiment
Biogeochemistry, Springer Nature 2025, Vol. 168, (4)
Puts, Isolde C.; Koizumi, Shuntaro; Sarneel, Judith M.; et al.
Nutrient, carbon, and darkening impacts on coastal dissolved phosphorus bioavailability: a mesocosm study
Limnology and Oceanography, John Wiley & Sons 2025, Vol. 70, (S2) : S183-S195
Rulli, Mayra P.D.; Garnier, Aurélie; Huss, Magnus; et al.
Declining calcium concentration drives shifts toward smaller and less nutritious zooplankton in northern lakes
Global Change Biology, John Wiley & Sons 2024, Vol. 30, (3)
Bergström, Ann-Kristin; Creed, Irena F.; Palstev, Aleksey; et al.
Phytoplankton biomass in northern lakes reveals a complex response to global change
Science of the Total Environment, Elsevier 2024, Vol. 940
Palstev, Aleksey; Bergström, Ann-Kristin; Vuorio, Kristiina; et al.
Investigating the diet source influence on freshwater fish mercury bioaccumulation and fatty acids: experiences from Swedish lakes and Chinese reservoirs
Ecotoxicology, Springer Nature 2024, Vol. 33, (4-5) : 415-424
Wu, Pianpian; Yan, Haiyu; Kainz, Martin J.; et al.
Nutrient limitation masks the dissolved organic matter composition effects on bacterial metabolism in unproductive freshwaters
Limnology and Oceanography, John Wiley & Sons 2023, Vol. 68, (9) : 2059-2069
Berggren, Martin; Ye, Linlin; Sponseller, Ryan A.; et al.
Contrasting impacts of warming and browning on periphyton
Limnology and Oceanography Letters, John Wiley & Sons 2023, Vol. 8, (4) : 628-638
Callisto Puts, Isolde; Ask, Jenny; Myrstener, Maria; et al.
Widespread synchrony in phosphorus concentrations in northern lakes linked to winter temperature and summer precipitation
Limnology and Oceanography Letters, John Wiley & Sons 2023, Vol. 8, (4) : 639-648
Isles, Peter D. F.; Creed, Irena F.; Hessen, Dag O.; et al.
Experimental warming and browning influence autumnal pelagic and benthic invertebrate biomass and community structure
Freshwater Biology, John Wiley & Sons 2023, Vol. 68, (7) : 1224-1237
Koizumi, Shuntaro; Hamdan, Mohammed; Callisto Puts, Isolde; et al.
Browning affects pelagic productivity in northern lakes by surface water warming and carbon fertilization
Global Change Biology, John Wiley & Sons 2023, Vol. 29, (2) : 375-390
Puts, Isolde C.; Ask, Jenny; Deininger, Anne; et al.
Biomass, community composition and N:P recycling ratios of zooplankton in northern high-latitude lakes with contrasting levels of N deposition and dissolved organic carbon
Freshwater Biology, John Wiley & Sons 2022, Vol. 67, (9) : 1508-1520
Bergström, Ann-Kristin; Lau, Danny C. P.; Isles, Peter D. F.; et al.
Resolving the Drivers of Algal Nutrient Limitation from Boreal to Arctic Lakes and Streams
Ecosystems (New York. Print), Springer-Verlag New York 2022, Vol. 25 : 1682-1699
Myrstener, Maria; Fork, Megan L.; Bergström, Ann-Kristin; et al.
An ecological and methodological assessment of benthic gross primary production in northern lakes
Ecosphere, John Wiley & Sons 2022, Vol. 13, (3)
Puts, Isolde; Bergström, Ann-Kristin; Verheijen, Hendricus; et al.
Landscape determinants of pelagic and benthic primary production in northern lakes
Global Change Biology, John Wiley & Sons 2022, Vol. 28, (23) : 7063-7077
Puts, Isolde C.; Ask, Jenny; Siewert, Matthias B.; et al.
Seasonal patterns in nutrient bioavailability in boreal headwater streams
Limnology and Oceanography, John Wiley & Sons 2022, Vol. 67, (5) : 1169-1183
Rulli, Mayra P. D.; Bergström, Ann-Kristin; Sponseller, Ryan A.; et al.
Effects of nitrogen enrichment on zooplankton biomass and N:P recycling ratios across a DOC gradient in northern-latitude lakes
Hydrobiologia, Springer 2021, Vol. 848, (21) : 4991-5010
Bergström, Ann-Kristin; Deininger, A.; Jonsson, Anders; et al.
Trade-offs Between Light and Nutrient Availability Across Gradients of Dissolved Organic Carbon Lead to Spatially and Temporally Variable Responses of Lake Phytoplankton Biomass to Browning
Ecosystems (New York. Print), Springer 2021, Vol. 24, (8) : 1837-1852
Isles, Peter D. F.; Creed, Irena F.; Jonsson, Anders; et al.
Lowered nutritional quality of plankton caused by global environmental changes
Global Change Biology, John Wiley & Sons 2021, Vol. 27, (23) : 6294-6306
Lau, Danny C. P.; Jonsson, Anders; Isles, Peter D. F.; et al.
Daphniaperformance on diets containing different combinations of high-quality algae, heterotrophic bacteria, and allochthonous particulate organic matter
Freshwater Biology, John Wiley & Sons 2021, Vol. 66, (1) : 157-168
Wenzel, Anja; Vrede, Tobias; Jansson, Mats; et al.
Hydrological controls on pelagic food structure: From shunts to chemostats as caused by runoff magnitudes and frequency of episodes
Hydrological Processes, John Wiley & Sons 2020, Vol. 34, (22) : 4150-4155
Bergström, Ann-Kristin
Changes in nutritional quality and nutrient limitation regimes of phytoplankton in response to declining N deposition in mountain lakes
Aquatic Sciences, Springer 2020, Vol. 82, (2)
Bergström, Ann-Kristin; Jonsson, Anders; Isles, Peter D. F.; et al.
Global changes may be promoting a rise in select cyanobacteria in nutrient-poor northern lakes
Global Change Biology, John Wiley & Sons 2020, Vol. 26, (9) : 4966-4987
Freeman, Erika C.; Creed, Irena F.; Jones, Blake; et al.
Does browning affect the identity of limiting nutrients in lakes?
Aquatic Sciences, Vol. 82, (2)
Isles, Peter D. F.; Jonsson, Anders; Creed, Irena F.; et al.
Stream metabolism controls diel patterns and evasion of CO2 in Arctic streams
Global Change Biology, John Wiley & Sons 2020, Vol. 26, (3) : 1400-1413
Rocher-Ros, Gerard; Sponseller, Ryan A.; Bergström, Ann-Kristin; et al.
Light and nutrient control phytoplankton biomass responses to global change in northern lakes
Global Change Biology, John Wiley & Sons 2019, Vol. 25, (6) : 2021-2029
Bergström, Ann-Kristin; Karlsson, Jan
Pelagic food webs of humic lakes show low short-term response to forest harvesting
Ecological Applications, Ecological Society of America 2019, Vol. 29, (1)
Deininger, Anne; Jonsson, A.; Karlsson, J.; et al.
Terrestrial diet influences mercury bioaccumulation in zooplankton and macroinvertebrates in lakes with differing dissolved organic carbon concentrations
Science of the Total Environment, Vol. 669 : 821-832
Wu, Pianpian; Kainz, Martin; Akerblom, Staffan; et al.
Contrasting plankton stoichiometry and nutrient regeneration in northern arctic and boreal lakes
Aquatic Sciences, Springer 2018, Vol. 80, (2)
Bergström, Ann-Kristin; Karlsson, Jan; Karlsson, Daniel; et al.
Global change-driven effects on dissolved organic matter composition: Implications for food webs of northern lakes
Global Change Biology, John Wiley & Sons 2018, Vol. 24, (8) : 3692-3714
Creed, Irena F.; Bergström, Ann-Kristin; Trick, Charles G.; et al.
Recent Synchronous Declines in DIN:TP in Swedish Lakes
Global Biogeochemical Cycles, American Geophysical Union (AGU) 2018, Vol. 32, (2) : 208-225
Isles, Peter D. F.; Creed, Irena F.; Bergström, Ann-Kristin
Weak response of greenhouse gas emissions to whole lake N enrichment
Limnology and Oceanography, Vol. 63 : S340-S353
Klaus, Marcus; Bergström, Ann-Kristin; Jonsson, Anders; et al.
Greenhouse gas emissions from boreal inland waters unchanged after forest harvesting
Biogeosciences, Copernicus Gesellschaft 2018, Vol. 15, (18) : 5575-5594
Klaus, Marcus; Geibrink, Erik; Jonsson, Anders; et al.
Persistent nitrogen limitation of stream biofilm communities along climate gradients in the Arctic
Global Change Biology, John Wiley & Sons 2018, Vol. 24, (8) : 3680-3691
Myrstener, Maria; Rocher-Ros, Gerard; Burrows, Ryan M.; et al.
Nitrogen effects on the pelagic food web are modified by dissolved organic carbon
Oecologia, SPRINGER 2017, Vol. 184, (4) : 901-916
Deininger, Anne; Faithfull, Carolyn; Bergström, Ann-Kristin
Phytoplankton response to whole lake inorganic N fertilization along a gradient in dissolved organic carbon
Ecology, Vol. 98, (4) : 982-994
Deininger, Anne; Faithfull, Carolyn L.; Bergström, Ann-Kristin
Pelagic food web response to whole lake N fertilization
Limnology and Oceanography, Vol. 62, (4) : 1498-1511
Deininger, Anne; Faithfull, Carolyn L.; Karlsson, Jan; et al.
New insights on resource stoichiometry: assessing availability of carbon, nitrogen, and phosphorus to bacterioplankton
Biogeosciences, Vol. 14, (6) : 1527-1539
Soares, Ana R. A.; Bergström, Ann-Kristin; Sponseller, Ryan A.; et al.
The effects of temperature and resource availability on denitrification and relative N2O production in boreal lake sediments
Journal of Environmental Sciences(China), Elsevier 2016, Vol. 47 : 82-90
Myrstener, Maria; Jonsson, Anders; Bergström, Ann-Kristin
Toward an ecologically meaningful view of resource stoichiometry in DOM-dominated aquatic systems
Journal of Plankton Research, Vol. 37, (3) : 489-499
Berggren, Martin; Sponseller, Ryan A.; Soares, Ana R. Alves; et al.
N-limited consumer growth and low nutrient regeneration N:P ratios in lakes with low N deposition
Ecosphere, Vol. 6, (1)
Bergström, Ann-Kristin; Karlsson, Daniel; Karlsson, Jan; et al.
Food web efficiency differs between humic and clear water lake communities in response to nutrients and light
Oecologia, Vol. 177, (3) : 823-835
Faithfull, Carolyn L.; Mathisen, Peter; Wenzel, Anja; et al.
Terrestrial organic matter input suppresses biomass production in lake ecosystems
Ecology, Ecological Society of America 2015, Vol. 96, (11) : 2870-2876
Karlsson, Jan; Bergström, Ann-Kristin; Byström, Pär; et al.
The influence of dissolved organic carbon on primary production in northern lakes
Limnology and Oceanography, John Wiley & Sons 2015, Vol. 60, (4) : 1276-1285
Seekell, David A.; Lapierre, Jean-Francois; Ask, Jenny; et al.
Nitrogen deposition and warming  – effects on phytoplankton nutrient limitation in subarctic lakes
Global Change Biology, Hoboken, NJ: Wiley-Blackwell 2013, Vol. 19, (8) : 2557-2568
Bergström, Ann-Kristin; Faithfull Mathisen, Carolyn; Karlsson, Daniel; et al.
Transfer of bacterial production based on labile carbon to higher trophic levels in an oligotrophic pelagic system
Canadian Journal of Fisheries and Aquatic Sciences, Montreal: Canadian Science Publishing 2012, Vol. 69, (1) : 85-93
Faithfull, Carolyn; Huss, Magnus; Vrede, Tobias; et al.
Survival, growth and reproduction of Daphnia galeata feeding on single and mixed Pseudomonas and Rhodomonas diets
Freshwater Biology, Vol. 57, (4) : 835-846
Wenzel, Anja; Bergström, Ann-Kristin; Jansson, Mats; et al.
Poor direct exploitation of terrestrial particulate organic material from peat layers by Daphnia galeata.
Canadian Journal of Fisheries and Aquatic Sciences, Vol. 69, (11) : 1870-1880
Wenzel, Anja; Bergström, Ann-Kristin; Jansson, Mats; et al.
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Film: Lowered nutritional quality of plankton caused by global environmental changes
Lowered nutritional quality of plankton caused by global environmental changes

Global environmental changes reduce the levels of omega-3 polyunsaturated fatty acids in plankton of northern lakes, thereby lowering their supply to wildlife and humans.

This video summarizes the main findings of the research article: Lau, D. C. P., Jonsson, A., Isles, P. D., Creed, I. F., & Bergström, A.-K. (2021). Lowered nutritional quality of plankton caused by global environmental changes. Global Change Biology. https://doi.org/10.1111/gcb.15887

Film: How terrestrial affects aquatic: Answers from northern lakes
How terrestrial affects aquatic: Answers from northern lakes

This video summarizes the main findings of the research article:

Isolde Callisto Puts, Jenny Ask, Matthias B. Siewert, Ryan A. Sponseller, Dag O. Hessen, Ann-Kristin Bergström (2022). Landscape determinants of pelagic and benthic primary production in northern lakes. Global change biology.  

https://doi.org/10.1111/gcb.16409