Phenological response of tundra plants to background climate variation tested using the International Tundra Experiment Journal Article


Authors: Oberbauer, S. F.; Elmendorf, S. C.; Troxler, T. G.; Hollister, R. D.; Rocha, A. V.; Bret-Harte, M. S.; Dawes, M. A.; Fosaa, A. M.; Henry, G. H. R.; Hoye, T. T.; Jarrad, F. C.; Jonsdottir, I. S.; Klanderud, K.; Klein, J. A.; Molau, U.; Rixen, C.; Schmidt, N. M.; Shaver, G. R.; Slider, R. T.; Totland, O.; Wahren, C. -H; Welker, J. M.
Article Title: Phenological response of tundra plants to background climate variation tested using the International Tundra Experiment
Abstract: The rapidly warming temperatures in high-latitude and alpine regions have the potential to alter the phenology of Arctic and alpine plants, affecting processes ranging from food webs to ecosystem trace gas fluxes. The International Tundra Experiment (ITEX) was initiated in 1990 to evaluate the effects of expected rapid changes in temperature on tundra plant phenology, growth and community changes using experimental warming. Here, we used the ITEX control data to test the phenological responses to background temperature variation across sites spanning latitudinal and moisture gradients. The dataset overall did not show an advance in phenology; instead, temperature variability during the years sampled and an absence of warming at some sites resulted in mixed responses. Phenological transitions of high Arctic plants clearly occurred at lower heat sum thresholds than those of low Arctic and alpine plants. However, sensitivity to temperature change was similar among plants from the different climate zones. Plants of different communities and growth forms differed for some phenological responses. Heat sums associated with flowering and greening appear to have increased over time. These results point to a complex suite of changes in plant communities and ecosystem function in high latitudes and elevations as the climate warms.
Keywords: GROWTH; REGIONS; ALASKA; VEGETATION; GLOBAL CHANGE; ERIOPHORUM-VAGINATUM; growth form; GROWING-SEASON; TIBETAN PLATEAU; snowmelt; Life Sciences Biomedicine - Other Topics; season length; thaw degree days
Journal Title: Philosophical Transactions of the Royal Society of London Series B-Biological Sciences
Volume: 368
Issue: 1624
ISSN: 0962-8436
Publisher: Royal Society, The  
Publication Place: LONDON; 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND
Date Published: 2013
Language: English
DOI/URL:
Notes: PT: J; NR: 46; TC: 3; J9: PHILOS T R SOC B; PG: 13; GA: 180AR; UT: WOS:000321565600004