Show simple item record

dc.contributor.authorArft, A. M.eng
dc.contributor.authorWalker, M. D.eng
dc.contributor.authorGurevitch, J.eng
dc.contributor.authorAlatalo, J. M.eng
dc.contributor.authorBret-Harte, M. S.eng
dc.contributor.authorDale, M.eng
dc.contributor.authorDiemer, M.eng
dc.contributor.authorGugerli, F.eng
dc.contributor.authorHenry, G. H. R.eng
dc.contributor.authorJones, M. H.eng
dc.contributor.authorHollister, R. D.eng
dc.contributor.authorJónsdóttir, I. S.eng
dc.contributor.authorLaine, K.eng
dc.contributor.authorLévesque, E.eng
dc.contributor.authorMarion, G. M.eng
dc.contributor.authorMolau, U.eng
dc.contributor.authorMølgaard, P.eng
dc.contributor.authorNordenhäll, U.eng
dc.contributor.authorRaszhivin, V.eng
dc.contributor.authorRobinson, C. H.eng
dc.contributor.authorStarr, G.eng
dc.contributor.authorStenström, A.eng
dc.contributor.authorStenström, M.eng
dc.contributor.authorTotland, Ørjaneng
dc.contributor.authorTurner, P. L.eng
dc.contributor.authorWalker, L. J.eng
dc.contributor.authorWebber, P. J.eng
dc.contributor.authorWelker, J. M.eng
dc.contributor.authorWookey, P. A.eng
dc.date.accessioned2008-02-13T10:20:18Z
dc.date.available2008-02-13T10:20:18Z
dc.date.issued1999eng
dc.identifier.citationEcological Monographs 1999 69 (4): 491-511en
dc.identifier.issn0012-9615eng
dc.identifier.urihttp://hdl.handle.net/1956/2583
dc.description.abstractThe 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.isoengeng
dc.publisherEcological Society of Americaeng
dc.subjectArctic tundraeng
dc.subjectExperimental warmingeng
dc.subjectGlobal changeeng
dc.subjectGlobal warmingeng
dc.subjectInternational Tundra Experimenteng
dc.subjectITEXeng
dc.subjectMeta-analysiseng
dc.subjectPlant response patternseng
dc.subjectSpatiotemporal gradientseng
dc.subjectTundra plantseng
dc.titleResponses of tundra plants to experimental warming : meta-analysis of the international tundra experimenteng
dc.typeJournal articleeng
dc.typePeer reviewedeng
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480nob
bora.peerreviewedPeer reviewedeng
bibo.doihttp://dx.doi.org/10.1890/0012-9615%281999%29069%5B0491%3AROTPTE%5D2.0.CO%3B2eng
dc.identifier.doihttp://dx.doi.org/10.1890/0012-9615%281999%29069%5B0491%3AROTPTE%5D2.0.CO%3B2


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record