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dc.contributor.author
Keva, Ossi
dc.contributor.author
Taipale, Sami J.
dc.contributor.author
Hayden, Brian
dc.contributor.author
Thomas, Stephen M.
dc.contributor.author
Vesterinen, Jussi
dc.contributor.author
Kankaala, Paula
dc.contributor.author
Kahilainen, Kimmo K.
dc.date.accessioned
2021-01-08T16:32:57Z
dc.date.available
2020-11-17T03:42:09Z
dc.date.available
2020-11-17T14:02:03Z
dc.date.available
2021-01-08T16:32:57Z
dc.date.issued
2021-01
dc.identifier.issn
1354-1013
dc.identifier.issn
1365-2486
dc.identifier.other
10.1111/gcb.15387
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/451616
dc.description.abstract
Climate change in the Arctic is outpacing the global average and land-use is intensifying due to exploitation of previously inaccessible or unprofitable natural resources. A comprehensive understanding of how the joint effects of changing climate and productivity modify lake food web structure, biomass, trophic pyramid shape and abundance of physiologically essential biomolecules (omega-3 fatty acids) in the biotic community is lacking. We conducted a space-for-time study in 20 subarctic lakes spanning a climatic (+3.2 degrees C and precipitation: +30%) and chemical (dissolved organic carbon: +10 mg/L, total phosphorus: +45 mu g/L and total nitrogen: +1,000 mu g/L) gradient to test how temperature and productivity jointly affect the structure, biomass and community fatty acid content (eicosapentaenoic acid [EPA] and docosahexaenoic acid [DHA]) of whole food webs. Increasing temperature and productivity shifted lake communities towards dominance of warmer, murky-water-adapted taxa, with a general increase in the biomass of primary producers, and secondary and tertiary consumers, while primary invertebrate consumers did not show equally clear trends. This process altered various trophic pyramid structures towards an hour glass shape in the warmest and most productive lakes. Increasing temperature and productivity had negative fatty acid content trends (mg EPA + DHA/g dry weight) in primary producers and primary consumers, but not in secondary nor tertiary fish consumers. The massive biomass increment of fish led to increasing areal fatty acid content (kg EPA + DHA/ha) towards increasingly warmer, more productive lakes, but there were no significant trends in other trophic levels. Increasing temperature and productivity are shifting subarctic lake communities towards systems characterized by increasing dominance of cyanobacteria and cyprinid fish, although decreasing quality in terms of EPA + DHA content was observed only in phytoplankton, zooplankton and profundal benthos.
en_US
dc.language.iso
en
en_US
dc.publisher
Blackwell Science
en_US
dc.subject
DOC
en_US
dc.subject
Food web structure
en_US
dc.subject
Forestry
en_US
dc.subject
Land-use
en_US
dc.subject
Nutrients
en_US
dc.subject
Omega-3 HUFA
en_US
dc.subject
Trophic level
en_US
dc.subject
Trophic pyramid
en_US
dc.title
Increasing temperature and productivity change biomass, trophic pyramids and community-level omega-3 fatty acid content in subarctic lake food webs
en_US
dc.type
Journal Article
dc.date.published
2020-10-30
ethz.journal.title
Global Change Biology
ethz.journal.volume
27
en_US
ethz.journal.issue
2
en_US
ethz.journal.abbreviated
Glob. chang. biol.
ethz.pages.start
282
en_US
ethz.pages.end
296
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2020-11-17T03:42:14Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-01-08T16:33:06Z
ethz.rosetta.lastUpdated
2021-01-08T16:33:06Z
ethz.rosetta.versionExported
true
ethz.COinS
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