Abstract
In the eastern United States, winter temperature has been increasing nearly twice as fast as summer temperature, but studies of warming effects on plants have focused on species that are photosynthetically active in summer. The terrestrial orchid Tipularia discolor is leafless in summer and acquires C primarily in winter. The optimum temperature for photosynthesis in T. discolor is higher than the maximum temperature throughout most of its growing season, and therefore growth can be expected to increase with warming. Contrary to this hypothesis, experimental warming negatively affected reproductive fitness (number of flowering stalks, flowers, fruits) and growth (change in leaf area from 2010 to 2012) in T. discolor. Temperature in June–July was critical for flowering, and mean July temperature greater than 29 °C (i.e., 2.5 °C above ambient) eliminated reproduction. Warming of 1.2 °C delayed flowering by an average of 10 days and fruiting by an average of 5 days. Warming of 4.4 °C reduced relative growth rates by about 60 %, which may have been partially caused by the direct effects of temperature on photosynthesis and respiration. Warming indirectly increased vapor pressure deficit (VPD) by 0.2–0.5 kPa, and leaf-to-air VPD over 1.3 kPa restricted stomatal conductance of T. discolor to 10–40 % of maximum conductance. These results highlight the need to account for changes in VPD when estimating temperature responses of plant species under future warming scenarios. Increasing temperature in the future will likely be an important limiting factor to the distribution of T. discolor, especially along the southern edge of its range.
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Acknowledgments
We thank Mark Boudreau and Lauren Nichols for maintaining the experimental site and Jesse Nippert for processing the C isotope data. The Hoffmann lab group, three anonymous reviewers, and Joy Ward provided helpful comments on the manuscript. The experimental warming site is funded by a US DOE PER award (DE-FG02-08ER64510) to R. R. Dunn, A. M. Ellison, N. J. Gotelli, and N. J. Sanders. This study was funded by the National Institute of Climate Change Research (NICCR-DE-FC02-06ER64156), and this publication was developed under STAR Fellowship Assistance Agreement no. F09A10379 awarded by the US Environmental Protection Agency (EPA). It has not been formally reviewed by EPA. The views expressed in this publication are solely those of R. M. Marchin, and EPA does not endorse any products or commercial services mentioned in this publication.
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Communicated by Joy K. Ward.
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Marchin, R.M., Dunn, R.R. & Hoffmann, W.A. Are winter-active species vulnerable to climate warming? A case study with the wintergreen terrestrial orchid, Tipularia discolor . Oecologia 176, 1161–1172 (2014). https://doi.org/10.1007/s00442-014-3074-8
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DOI: https://doi.org/10.1007/s00442-014-3074-8