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Ecosystem feedbacks and cascade processes : understanding their role in the responses of Arctic and alpine ecosystems to environmental change

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dc.contributor.author Wookey, Philip A.
dc.contributor.author Aerts, Rien
dc.contributor.author Bardgett, Richard D.
dc.contributor.author Baptist, Florence
dc.contributor.author Bråthen, Kari Anne
dc.contributor.author Cornelissen, Johannes H. C.
dc.contributor.author Gough, Laura
dc.contributor.author Hartley, Iain P.
dc.contributor.author Hopkins, David W.
dc.contributor.author Lavorel, Sandra
dc.contributor.author Shaver, Gaius R.
dc.date.accessioned 2009-04-30T13:34:53Z
dc.date.available 2009-04-30T13:34:53Z
dc.date.issued 2008-09-11
dc.identifier.uri http://hdl.handle.net/1912/2817
dc.description Author Posting. © The Authors, 2009. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Global Change Biology 15 (2009): 1153-1172, doi:10.1111/j.1365-2486.2008.01801.x. en
dc.description.abstract Global environmental change, related to climate change and the deposition of airborne N-containing contaminants, has already resulted in shifts in plant community composition among plant functional types in arctic and temperate alpine regions. In this paper, we review how key ecosystem processes will be altered by these transformations, the complex biological cascades and feedbacks that may result, and some of the potential broader consequences for the earth system. Firstly, we consider how patterns of growth and allocation, and nutrient uptake, will be altered by the shifts in plant dominance. The ways in which these changes may disproportionately affect the consumer communities, and rates of decomposition, are then discussed. We show that the occurrence of a broad spectrum of plant growth forms in these regions (from cryptogams to deciduous and evergreen dwarf shrubs, graminoids and forbs), together with hypothesized low functional redundancy, will mean that shifts in plant dominance result in a complex series of biotic cascades, couplings and feedbacks which are supplemental to the direct responses of ecosystem components to the primary global change drivers. The nature of these complex interactions is highlighted using the example of the climate-driven increase in shrub cover in low arctic tundra, and the contrasting transformations in plant functional composition in mid-latitude alpine systems. Finally, the potential effects of the transformations on ecosystem properties and processes which link with the earth system are reviewed. We conclude that the effects of global change on these ecosystems, and potential climate-change feedbacks, can not be predicted from simple empirical relationships between processes and driving variables. Rather, the effects of changes in species distributions and dominances on key ecosystem processes and properties must also be considered, based upon best estimates of the trajectories of key transformations, their magnitude and rates of change. en
dc.description.sponsorship We thank the International Arctic Science Committee (IASC) for their support for this Mini- Review as part of the IASC Circum-Arctic Terrestrial Biodiversity initiative (CAT-B) and as part of International Polar Year 2007/2008. en
dc.format.mimetype image/jpeg
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.relation.uri http://dx.doi.org/10.1111/j.1365-2486.2008.01801.x
dc.subject Arctic en
dc.subject Alpine en
dc.subject Carbon en
dc.subject Ecosystem en
dc.subject Energy en
dc.subject Global change en
dc.subject Feedback en
dc.subject Nitrogen en
dc.subject Herbivory en
dc.subject Plant functional type en
dc.title Ecosystem feedbacks and cascade processes : understanding their role in the responses of Arctic and alpine ecosystems to environmental change en
dc.type Preprint en


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