Long-Term Response of Plants at Barrow and Atqasuk to ITEX Warming Experiments
Robert D. Hollister, Patrick J. Webber , Steven P. Rewa, and Craig E. Tweedie
Task 3:
Describe general patterns of plant response to temperature in the context of other research.
It is important to describe patterns of species response in order to make predictions of response to future climatic regimes. For example, the pooling of data is useful in order to make broad generalizations, such as the generalization described at NCEAS (National Center for Ecological Analysis and Synthesis) by the collective ITEX network that vegetative growth is greatest in early years and gives way to reproductive effort in later years in response to OTC warming. The MSU ITEX data do not show this trend, rather the vegetative growth and reproductive effort have a small yet consistent increase in the OTCs (Figure K).
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| Figure K - Effect size (d index) of OTC warming determined by meta analysis of species vegetative growth and reproductive effort for all species at all sites for both the collective ITEX network analyzed at NCEAS and the MSU ITEX sites only. The MSU data set is now longer than the collective NCEAS analysis run in 1997. The mean effect size for each treatment year is indicated with a diamond and vertical bars representing the 95% confidence interval. An asterisk (*) indicates that the confidence interval is significantly different from zero at p< 0.05. Effect sizes of 0.2, 0.5, and 0.8 represent small, medium, and large responses, respectively. | |
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