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Missing effects of anthropogenic nutrient deposition on sentinel alpine ecosystems

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dc.contributor Universitat de Vic. Escola Politècnica Superior
dc.contributor.author Vinebrooke, R.D.
dc.contributor.author Maclennan, M.M.
dc.contributor.author Bartrons, Mireia
dc.contributor.author Zettel, J.P.
dc.date.accessioned 2014-06-25T08:06:22Z
dc.date.available 2014-06-25T08:06:22Z
dc.date.created 2014
dc.date.issued 2014
dc.identifier.citation Vinebrooke, R. D., Maclennan, M. M., Bartrons, M., & Zettel, J. P. (2014). Missing effects of anthropogenic nutrient deposition on sentinel alpine ecosystems. Global Change Biology, 20(7), 2173-2182.DOI: 10.1111/gcb.12484 ca_ES
dc.identifier.issn 1365-2486
dc.identifier.uri http://hdl.handle.net/10854/3200
dc.description.abstract Anthropogenic nitrogen (N) deposition affects unproductive remote alpine and circumpolar ecosystems, which are often considered sentinels of global change. Human activities and forest fires can also elevate phosphorus (P) deposition, possibly compounding the ecological effects of increased N deposition given the ubiquity of nutrient co-limitation of primary producers. Low N : P ratios coupled with evidence of NP-limitation from bioassays led us to hypothesize that P indirectly stimulates phytoplankton by amplifying the direct positive effect of N (i.e. serial N-limitation) in alpine ponds. We tested the hypothesis using the first replicated N × P enrichment experiment conducted at the whole-ecosystem level, which involved 12 alpine ponds located in the low N deposition backcountry of the eastern Front Range of the Canadian Rockies. Although applications of N and P elevated ambient N and P concentrations by 2–5×, seston and plankton remained relatively unaffected in the amended ponds. However, additions of ammonium nitrate elevated the δ15N signals of both primary producers and herbivores (fairy shrimp; Anostraca), attesting to trophic transfer of N deposition to consumers. Further, in situ bioassays revealed that grazing by high ambient densities of fairy shrimp together with potential competition from algae lining the pond bottoms suppressed the otherwise serially N-limited response by phytoplankton. Our findings highlight how indirect effects of biotic interactions rather the often implicit direct effects of chemical changes can regulate the sensitivities of extreme ecosystems to nutrient deposition. ca_ES
dc.format application/pdf
dc.format.extent 10 p. ca_ES
dc.language.iso eng ca_ES
dc.publisher Wiley ca_ES
dc.rights Tots els drets reservats
dc.rights (c) Wiley [The definitive version is available at www3.interscience.wiley.com] ca_ES
dc.subject.other Ecosistemes ca_ES
dc.title Missing effects of anthropogenic nutrient deposition on sentinel alpine ecosystems ca_ES
dc.type info:eu-repo/semantics/article ca_ES
dc.identifier.doi https://doi.org/doi:10.1111/gcb.12484
dc.relation.publisherversion http://onlinelibrary.wiley.com/doi/10.1111/gcb.12484/abstract
dc.rights.accesRights info:eu-repo/semantics/closedAccess ca_ES
dc.type.version info:eu-repo/publishedVersion ca_ES
dc.indexacio Indexat a WOS/JCR
dc.indexacio Indexat a SCOPUS ca_ES

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