Umeå universitet
printicon
Huvudmenyn dold.
Personalbild Ann-Kristin Bergström

Ann-Kristin Bergström

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

Kontakt

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

Verksam vid

Anknytning
Professor vid Institutionen för ekologi, miljö och geovetenskap
Plats
KB. H3, Linnaeus väg 6, Umeå, A3.38.21 Umeå universitet, 901 87 Umeå

Särskilt fokus inom min forskning ligger i att studera betydelsen av organiskt material (humusämnen) och näringsämnen (kväve och fosfor) 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 näringstillgång och 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 och trofisk överföringseffektivitet, samt produktivitet i nordliga boreala och subarktiska sjöar.

Min forskning är kopplad till Arctic CIRC (Climate Impacts Research Centre)

Effects of nitrogen enrichment on zooplankton biomass and N:P recycling ratios across a DOC gradient in northern-latitude lakes
Hydrobiologia
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)
Isles, Peter D. F.; Creed, Irena F.; Jonsson, Anders; et al.
Lowered nutritional quality of plankton caused by global environmental changes
Global Change Biology
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 communitiesalong 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.
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.
Effects of nutrients and physical lake characteristics on bacterial and phytoplankton production: A meta-analysis
Limnology and Oceanography, American Society of Limnology and Oceanography (ASLO) 2011, Vol. 56, (5) : 1703-1713
Faithfull, Carolyn; Bergström, Ann-Kristin; Vrede, Tobias
Bottom–up carbon subsidies and top–down predation pressure interact to affect aquatic food web structure
Oikos, John Wiley 2011, Vol. 120, (2) : 311-320
Faithfull, Carolyn; Huss, Magnus; Vrede, Tobias; et al.
Testing the light: nutrient hypothesis in an oligotrophic boreal lake
Ecosphere, Ecological Society of America 2011, Vol. 2, (11) : 123-
Faithfull, Carolyn; Wenzel, Anja; Vrede, Tobias; et al.
Lake secondary production fueled by rapid transfer of low molecular weight organic carbon from terrestrial sources to aquatic consumers
Ecology Letters, Vol. 13, (7) : 870-880
Berggren, Martin; Ström, L; Laudon, H; et al.
The use of TN:TP and DIN:TP ratios as indicators for phytoplankton nutrient limitation in oligotrophic lakes affected by N deposition
Aquatic Sciences, Vol. 72, (3) : 277-281
Bergström, Ann-Kristin
Pelagic energy mobilization across crossed gradients of phosphorus and dissolved organic carbon in a chemostat experiment
INTERNATIONAL ASSOCIATION OF THEORETICAL AND APPLIED LIMNOLOGY, VOL 30, PT 9 : 1411-1415
Faithfull, Carolyn; Bergström, Ann-Kristin; Vrede, Tobias
Seasonal dynamics of bacteria and mixotrophic flagellates as related to input of allochthonous dissolved organic carbon
International association of theoretical and applied limnology, vol 30, pt 6: proceedings, Stuttgart: Schweizerbart 2009 : 923-928
Bergström, Ann-Kristin
Seasonal dynamics of bacteria and mixotrophic flagellates as related to input of allochthonous dissolved organic carbon: internal and external sources to the CO2 emission from a subarctic lake
Verhandlungen / Internationale Vereinigung für Theoretische und Angewandte Limnologie, Vol. 30, (6) : 923-928
Bergström, Ann-Kristin
Shifts in lake N:P stoichiometry and nutrient limitation driven by atmospheric nitrogen deposition
Science, Vol. 326 : 835-837
Elser, JJ; Andersen, T; Baron, J; et al.
Composition and dispersal of riverine and lake phytoplankton communities in connected systems with different water retention times
Freshwater Biology, Vol. 53 : 2520–2529-
Bergström, Ann-Kristin; Bigler, Christian; Stensdotter, U.; et al.
Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive Swedish lakes along a gradient of atmospheric nitrogen deposition
Aquatic Biology, Vol. 4 : 55-64
Bergström, Ann-Kristin; Jonsson, Anders; Jansson, Mats
Integrating aquatic carbon fluxes in a boreal catchment carbon budget
Journal of Hydrology, Vol. 334, (1-2) : 141-150
Jonsson, Anders; Algesten, Grete; Bergström, Ann-Kristin; et al.
Atmospheric nitrogen deposition has caused nitrogen enrichment and eutrophication of lakes in the northern hemisphere
Global Change Biology, Vol. 12 : 1-9
Bergström, Ann-Kristin; Jansson, Mats
Bacterioplankton growth and nutrient use efficiencies under variable organic carbon and inorganic phosphorus ratios
Microbial Ecology, Vol. 52, (2) : 258-264
Jansson, Mats; Bergström, Ann-Kristin; Lymer, David; et al.
External control of bacterial community structure in lakes
Limnology and Oceanography, Vol. 51 : 339-342
Lindström, E S; Forslund, M; Algesten, G; et al.
Contribution of sediment respiration to summer CO2 emission from boreal and subarctic lakes
Microbial Ecology, Vol. 50, (4) : 529-535
Algesten, Grete; Sobek, Sebastian; Bergström, Ann-Kristin; et al.
Effects of atmospheric nitrogen deposition on nutrient limitation and phytoplankton biomass in unproductive Swedish lakes
Limnology & Oceanography, Vol. 50 : 987-994
Bergström, Ann-Kristin; Blomqvist, P; Jansson, Mats
Visa publikationer i DiVA

Jag är programansvarig för mastersprogrammet i geovetenskap.

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