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Spatial patterns an...
Spatial patterns and dynamic responses of arctic food webs corroborate the exploitation ecosystems hypothesis (EEH)
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- Aunapuu, Maano (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Dahlgren, Jonas (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Oksanen, Tarja (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Grellmann, Doris (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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Oksanen, Lauri (author)
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- Olofsson, Johan (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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Rammul, Ullar (author)
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Schneider, Michael (author)
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Johansen, Bernt (author)
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Hygen, Hans Olav (author)
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(creator_code:org_t)
- University of Chicago Press, 2008
- 2008
- English.
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In: American Naturalist. - : University of Chicago Press. - 0003-0147 .- 1537-5323. ; 171:2, s. 249-262
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- According to the exploitation ecosystems hypothesis (EEH), productive terrestrial ecosystems are characterized by community‐level trophic cascades, whereas unproductive ecosystems harbor food‐limited grazers, which regulate community‐level plant biomass. We tested this hypothesis along arctic‐alpine productivity gradients at the Joatka field base, Finnmark, Norway. In unproductive habitats, mammalian predators were absent and plant biomass was constant, whereas herbivore biomass varied, reflecting the productivity of the habitat. In productive habitats, predatory mammals were persistently present and plant biomass varied in space, but herbivore biomass did not. Plant biomass of productive tundra scrublands declined by 40% when vegetation blocks were transferred to predation‐free islands. Corresponding transfer to herbivore‐free islands triggered an increase in plant biomass. Fertilization of an unproductive tundra heath resulted in a fourfold increase in rodent density and a corresponding increase in winter grazing activity, whereas the total aboveground plant biomass remained unchanged. These results corroborate the predictions of the EEH, implying that the endotherm community and the vegetation of the North European tundra behaves dynamically as if each trophic level consisted of a single population, in spite of local co‐occurrence of >20 plant species representing different major taxonomic groups, growth forms, and defensive strategies.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- arctic
- herbivory
- plant communities
- predation
- trophic cascades
- tundra vegetation
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Aunapuu, Maano
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Dahlgren, Jonas
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Oksanen, Tarja
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Grellmann, Doris
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Oksanen, Lauri
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Olofsson, Johan
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show more...
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Rammul, Ullar
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Schneider, Micha ...
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Johansen, Bernt
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Hygen, Hans Olav
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Ecology
- Articles in the publication
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American Natural ...
- By the university
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Umeå University