DOI: 10.7291/d1sd5s
title: Neighbours consistently influence tree growth and survival in a frequently burned open oak landscape

description: The 16-ha Cedar Creek plot had all trees at least 2 cm dbh measured every
 5 years from 1990 to 2015. Additional censuses were carried out every
 year, but trees were only checked for survival in those intervening
 censuses. The six growth censuses are thus numbered 1, 6, 11, 16, 21, 26.
 Data included here were used in Davis and Condit (2022). More details on
 methods and other uses of the data appear Davis (2021) and Davis
 et al. (1997, 2005). References Davis, M. A., Duke, A., Ibsen, T., Tran,
 H., and Rhodes, R. 1997. Spatial Distribution of Penstemon
 grandiflorus(Nutt.) and Geomys bursarius in a fragmented
 oak woodland in Minnesota, USA. Natural Areas Journal 17:136-143. Davis,
 M. A., Curran, C., Tietmeyer, A., and  Miller, A. 2005. Dynamic
 tree aggregation patterns in a species-poor temperate woodland disturbed
 by fire. Journal of Vegetation Science 16: 167-174. Davis, M. A.
 2021.  Twenty-five years of tree demography in a frequently
 burned oak woodland: implications for savanna restoration. Ecosphere
 2(12):e03844. 10.1002/ecs2.3844. Davis, M. A., Condit R. 2022. Neighbors
 consistently influence tree growth and survival in a frequently burned
 open oak landscape. Journal of Ecology, in press.
description: See references under abstract.
description: The 16-ha Cedar Creek plot had all trees at least 2 cm dbh
 measured every 5 years from 1990 to 2015. Additional censuses were carried
 out every year, but trees were only checked for survival in those
 intervening censuses. The six growth censuses are thus numbered 1, 6, 11,
 16, 21, 26.  Summary Results: We present four short
 tables in pdf format with median growth and survival rates as a function
 of density. Detailed legends for each table appear in the pdf. 
 Table 1. Median growth rate of bur oak vs. neighborhood density,
 both conspecific and heterospecific. Densities were binned into four
 categories, giving 16 combinations and clearly separating effects of
 conspecifics and heterospecifics. Growth rate decline consistently with
 density, moreso with conspecifics than heterospecifics. Growth is
 transformed with the equation given the the text. 
 Table 2. Growth rate of pin oak vs. neighborhood density, as in
 Table 1. Growth rate declined with conspecific density, but not
 heterospecific.  Table 3. Five-year survival rates of
 bur oak vs. neighborhood density, as in Tables 1-2. Survival rates
 increased sharply with density of neighbors, especially conspecifics, and
 trees in the highest density categories had extremely low death
 rates. Table 4. Five-year survival rates of pin oak vs.
 neighborhood density, as in Table 3. Survival rates increased sharply with
 density of neighbors, especially heterospecifics, and trees in the highest
 density categories had extremely low death rates.
 FullPlot Data: The main data includes tables of all trees, stems,
 and environmental variables. These were the basis of all analyses in Davis
 and Condit (2022), as well as Tables 1-4 above. The three tables are in
 tab-delimited ascii format: 1) Trees, 2) Stems, 3) Environment. The README
 file has a full description of every column in the tables.