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Supplemental Information

Tree abundance-elevation change

Changes in live tree abundances at low, middle, and high elevation in response to the 2011 freeze and drought event.

DOI: 10.7287/peerj.preprints.237v1/supp-1

Chisos weather

Climatic conditions from 2010-2012 in the Chisos Basin of Big Bend National Park, Texas (WRCC 2013) including A) monthly extreme low temperatures, B) mean monthly maximum temperatures, and C) mean monthly precipitation. The weather station is located within 0.25 km of the middle elevation sample sites in this study.

DOI: 10.7287/peerj.preprints.237v1/supp-2

Stand structural data

Changes in forest stand structure due to drought and freezing in 2011 in the Chisos Mountains, Big Bend National Park, Texas. Mean values (+ S. E.) prior to the drought (2009) and after the drought (2011) are shown for A) seedlings by species, B) live trees (> 5 cm dbh) by species, C) live trees in 5 cm diameter classes, and D) standing dead trees. Significant changes between sampling intervals (P < 0.05) are indicated with an (*).

DOI: 10.7287/peerj.preprints.237v1/supp-3

Tree size-mortality regression

Regression of tree dbh (cm) as a predictor of percentage tree mortality. Percentage mortality was significantly (P = 0.0016) correlated with tree size (y = 9.9538e-0.062x). Smaller trees suffered 2 to 5 times higher mortality than larger trees.

DOI: 10.7287/peerj.preprints.237v1/supp-4

Trees by elevation

Changes in mean (+ SE) live tree density (ha-1) at low, middle, and high elevations of the Chisos Mountains, Texas. Significant changes between sampling intervals (P < 0.05) are indicated with an (*).

DOI: 10.7287/peerj.preprints.237v1/supp-5

Additional Information

Competing Interests

There are no competing interests for this manuscript.

Author Contributions

Helen M Poulos conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, responsible for all elements of this manuscript.

Grant Disclosures

The following grant information was disclosed by the authors:

National Park Service; Task #J713005001K.


Financial support for this project was provided by the National Park Service as part of task # J713005001K. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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