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Responses of tundra plants to experimental warming : meta-analysis of the international tundra experiment

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dc.contributor.author Arft, A. M. eng
dc.contributor.author Walker, M. D. eng
dc.contributor.author Gurevitch, J. eng
dc.contributor.author Alatalo, J. M. eng
dc.contributor.author Bret-Harte, M. S. eng
dc.contributor.author Dale, M. eng
dc.contributor.author Diemer, M. eng
dc.contributor.author Gugerli, F. eng
dc.contributor.author Henry, G. H. R. eng
dc.contributor.author Jones, M. H. eng
dc.contributor.author Hollister, R. D. eng
dc.contributor.author Jónsdóttir, I. S. eng
dc.contributor.author Laine, K. eng
dc.contributor.author Lévesque, E. eng
dc.contributor.author Marion, G. M. eng
dc.contributor.author Molau, U. eng
dc.contributor.author Mølgaard, P. eng
dc.contributor.author Nordenhäll, U. eng
dc.contributor.author Raszhivin, V. eng
dc.contributor.author Robinson, C. H. eng
dc.contributor.author Starr, G. eng
dc.contributor.author Stenström, A. eng
dc.contributor.author Stenström, M. eng
dc.contributor.author Totland, Ørjan eng
dc.contributor.author Turner, P. L. eng
dc.contributor.author Walker, L. J. eng
dc.contributor.author Webber, P. J. eng
dc.contributor.author Welker, J. M. eng
dc.contributor.author Wookey, P. A. eng
dc.date.accessioned 2008-02-13T10:20:18Z
dc.date.available 2008-02-13T10:20:18Z
dc.date.issued 1999
dc.identifier.citation Ecological Monographs 1999 69 (4): 491-511 en
dc.identifier.issn 0012-9615 eng
dc.identifier.uri http://hdl.handle.net/1956/2583
dc.description.abstract The International Tundra Experiment (ITEX) is a collaborative, multisite experiment using a common temperature manipulation to examine variability in species response across climatic and geographic gradients of tundra ecosystems. ITEX was designed specifically to examine variability in arctic and alpine species response to increased temperature. We compiled from one to four years of experimental data from 13 different ITEX sites and used meta-analysis to analyze responses of plant phenology, growth, and reproduction to experimental warming. Results indicate that key phenological events such as leaf bud burst and flowering occurred earlier in warmed plots throughout the study period; however, there was little impact on growth cessation at the end of the season. Quantitative measures of vegetative growth were greatest in warmed plots in the early years of the experiment, whereas reproductive effort and success increased in later years. A shift away from vegetative growth and toward reproductive effort and success in the fourth treatment year suggests a shift from the initial response to a secondary response. The change in vegetative response may be due to depletion of stored plant reserves, whereas the lag in reproductive response may be due to the formation of flower buds one to several seasons prior to flowering. Both vegetative and reproductive responses varied among life-forms; herbaceous forms had stronger and more consistent vegetative growth responses than did woody forms. The greater responsiveness of the herbaceous forms may be attributed to their more flexible morphology and to their relatively greater proportion of stored plant reserves. Finally, warmer, low arctic sites produced the strongest growth responses, but colder sites produced a greater reproductive response. Greater resource investment in vegetative growth may be a conservative strategy in the Low Arctic, where there is more competition for light, nutrients, or water, and there may be little opportunity for successful germination or seedling development. In contrast, in the High Arctic, heavy investment in producing seed under a higher temperature scenario may provide an opportunity for species to colonize patches of unvegetated ground. The observed differential response to warming suggests that the primary forces driving the response vary across climatic zones, functional groups, and through time. en
dc.language.iso eng eng
dc.publisher Ecological Society of America en
dc.subject Arctic tundra eng
dc.subject Experimental warming eng
dc.subject Global change eng
dc.subject Global warming eng
dc.subject International Tundra Experiment eng
dc.subject ITEX eng
dc.subject Meta-analysis eng
dc.subject Plant response patterns eng
dc.subject Spatiotemporal gradients eng
dc.subject Tundra plants eng
dc.title Responses of tundra plants to experimental warming : meta-analysis of the international tundra experiment en
dc.type Journal article eng
dc.type Peer reviewed eng
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 nob
bora.peerreviewed Peer reviewed eng
bibo.doi http://dx.doi.org/10.1890/0012-9615(1999)069[0491:ROTPTE]2.0.CO;2 eng
dc.identifier.doi http://dx.doi.org/10.1890/0012-9615(1999)069[0491:ROTPTE]2.0.CO;2


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