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Table 1 The US papers from 2005 to 2018 chosen for our literature review that measured and discussed the effect of distance to seed source on tree regeneration following wildfires. Papers, region, signficant relationship, and distance are described. A plus sign (+) indicates a positive relationship between distance to seed source and tree regeneration, a minus sign (−) indicates a negative relationship, and a zero (0) indicates no relationship. The major findings describe the distance at which tree regeneration begins to decline, and the distance beyond which no regeneration was detected in parentheses, if identified in individual papers. All distances are in meters. In some cases, a distance was not specified, although a significant relationship was detected. Additionally in some cases, different metrics or descriptions were used and are included here

From: Tree regeneration following wildfires in the western US: a review

StudyUS RegionRelationship between distance of seed source to seedling densityMajor findings
Bonnet et al. 2005Black Hills, South Dakota50 m
Lentile et al. 2005Black Hills, South Dakota30 m
Shatford et al. 2007Pacific Northwest0No difference detected between 50 m and 400 m from edge
Tepley et al. 2017Pacific NorthwestMeasured “propagule pressure:”
the proportion of area within a 400 m radius circle (50 ha) with living trees
Collins and Roller 2013Pacific Southwest0No difference detected
Ritchie and Knapp 2014Pacific Southwest60 m
Welch et al. 2016Pacific Southwest40 m
Haire and McGarigal 2010Southwest150 to 200 m
Owen et al. 2017SouthwestDistance not specified
Haffey et al. 2018Southwest150 m (225 m)
Coop and Schoettle 2009Southern Rocky MountainsNegative relationship but seedlings present at all sites
Coop et al. 2010Southern Rocky Mountains50 to 100 m
Rother and Veblen 2016Southern Rocky Mountains50
Chambers et al. 2016Southern Rocky Mountains50 to 100 m
Ziegler et al. 2017Southern Rocky MountainsDistance not specified
Malone et al. 2018Southern Rocky Mountains30 m
Donato et al. 2016Northern Rocky Mountains− and +100 m for dry forests; higher densities of P. contorta at farther distances
Harvey et al. 2016Northern Rocky Mountains150 to 330 m
Kemp et al. 2016Northern Rocky Mountains95 m
Leirfallom et al. 2015Northern Rocky MountainsNegative relationship but seedlings present at all sites
Urza and Sibold 2017Northern Rocky Mountains>100 m
Stevens-Rumann et al. 2015Northern Rocky MountainsDistance not specified
Stevens-Rumann and Morgan 2016Northern Rocky MountainsDistance not specified
Stevens-Rumann et al. 2018Northern Rocky Mountains200 m
Turner et al. 2004Northern Rocky Mountains“Distance to unburned forest was significant but explained only 3% … of variation”
Turner et al. 2016Northern Rocky Mountains0No difference detected