Primary Research Article

Sapling growth responses to warmer temperatures ‘cooled’ by browse pressure

  1. Nicholas Fisichelli1,*,
  2. Lee E. Frelich1,
  3. Peter B. Reich1,2

Article first published online: 21 AUG 2012

DOI: 10.1111/j.1365-2486.2012.02785.x

Issue

Global Change Biology

Global Change Biology

Volume 18, Issue 11, pages 3455–3463, November 2012

Additional Information

How to Cite

Fisichelli, N., Frelich, L. E. and Reich, P. B. (2012), Sapling growth responses to warmer temperatures ‘cooled’ by browse pressure. Global Change Biology, 18: 3455–3463. doi: 10.1111/j.1365-2486.2012.02785.x

Author Information

  1. 1

    Department of Forest Resources, University of Minnesota, St. Paul, USA

  2. 2

    Hawksbury Institute for the Environment, University of Western Sydney, Penrith, Australia

*Correspondence: N. Fisichelli, Department of Silviculture and Forest Ecology of the Temperate Zone, Georg-August-Universität, Büsgenweg 1, 37077 Göttingen, Germany, tel. + 49 551 393 667, fax + 49 551 393 270, email: nfisichelli@gmail.com

Publication History

  1. Issue published online: 4 OCT 2012
  2. Article first published online: 21 AUG 2012
  3. Accepted manuscript online: 12 JUL 2012 11:55AM EST
  4. Manuscript Accepted: 23 MAY 2012
  5. Manuscript Received: 13 APR 2012

Funded by

  • US Environmental Protection Agency's
  • University of Minnesota
  • Hubachek Wilderness Research Foundation
  • Dayton-Wilkie Natural History Fund of the Bell Museum of Natural History
  • University of Minnesota

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FilenameFormatSizeDescription
gcb2785-sup-0001-FigureS1.TIFimage/TIF12563KFigure S1. Bivariate relationships between (a) radial growth and initial size, (b) radial growth and canopy openness, (c) height growth and initial size, (d) height growth and canopy openness for saplings of all five study species.
gcb2785-sup-0002-FigureS2.TIFimage/TIF3615KFigure S2. Height (a, c, e, g) and radial (b, d, f, h) growth model residual plots. See Tables S5 and S6 for model parameters.
gcb2785-sup-0003-FigureS3.TIFimage/TIF5311KFigure S3. Height (a, c, e, g) and radial (b, d, f, h) growth responses to browse interactions. Browse damage index (0–10) was based on the percentage of browse damaged branches on individual saplings (0 = 0%, 10 = 100%). Low (red) and high (black) values of interacting factors are assigned their 20th and 80th percentile values, respectively. Dashed lines represent approximate 95% prediction intervals.
gcb2785-sup-0004-TableS1.docxWord document60KTable S1. Summary data for the two boreal conifer and three temperate broadleaf study species. Species selected were common as advance regeneration in temperate-boreal transition zone forests. Stem age and radial growth were determined from basal cross-sections harvested 10 cm above ground level.
gcb2785-sup-0005-TableS2.docxWord document60KTable S2. Species level stem counts by size class and site. Sites are arranged by mean summer temperature [June–August 2005–2009 (Daly et al., 2008)].
gcb2785-sup-0006-TableS3.docxWord document60KTable S3. Height growth model rankings based on AICc. Top models (<2 ΔAICc), base (size + light), browse (size + light + browse), temperature (size + light + temperature), and additive (size + light + browse + temperature) models are shown for comparison. Model parameter symbols: S = initial size, L = canopy openness (light), B = browse pressure, T = mean summer temperature (JJA, °C 2007–2008). Two letters combined represent two-way interactions.
gcb2785-sup-0007-TableS4.docxWord document60KTable S4. Radial growth model rankings based on AICc. Top models (<2 ΔAICc), base (size + light), browse (size + light + browse), temperature (size + light + temperature), and additive (size + light + browse + temperature) models are shown for comparison. Model parameter symbols: S = initial size, L = canopy openness (light), B = browse pressure, T = mean summer temperature (JJA, °C 2005–2009). Two letters combined represent two-way interactions.
gcb2785-sup-0008-TableS5.docxWord document60KTable S5. Fixed effects parameter estimates from linear mixed-effects models of sapling height growth for each of the five study species. r2 is the squared correlation coefficient between observed and modeled values.
gcb2785-sup-0009-TableS6.docxWord document60KTable S6. Fixed effects parameter estimates from linear mixed-effects models of sapling radial growth for each of the five study species. r2 is the squared correlation coefficient between observed and modeled values.

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