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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

Study US Region Relationship between distance of seed source to seedling density Major findings
Bonnet et al. 2005 Black Hills, South Dakota 50 m
Lentile et al. 2005 Black Hills, South Dakota 30 m
Shatford et al. 2007 Pacific Northwest 0 No difference detected between 50 m and 400 m from edge
Tepley et al. 2017 Pacific Northwest Measured “propagule pressure:” the proportion of area within a 400 m radius circle (50 ha) with living trees
Collins and Roller 2013 Pacific Southwest 0 No difference detected
Ritchie and Knapp 2014 Pacific Southwest 60 m
Welch et al. 2016 Pacific Southwest 40 m
Haire and McGarigal 2010 Southwest 150 to 200 m
Owen et al. 2017 Southwest Distance not specified
Haffey et al. 2018 Southwest 150 m (225 m)
Coop and Schoettle 2009 Southern Rocky Mountains Negative relationship but seedlings present at all sites
Coop et al. 2010 Southern Rocky Mountains 50 to 100 m
Rother and Veblen 2016 Southern Rocky Mountains 50
Chambers et al. 2016 Southern Rocky Mountains 50 to 100 m
Ziegler et al. 2017 Southern Rocky Mountains Distance not specified
Malone et al. 2018 Southern Rocky Mountains 30 m
Donato et al. 2016 Northern Rocky Mountains − and + 100 m for dry forests; higher densities of P. contorta at farther distances
Harvey et al. 2016 Northern Rocky Mountains 150 to 330 m
Kemp et al. 2016 Northern Rocky Mountains 95 m
Leirfallom et al. 2015 Northern Rocky Mountains Negative relationship but seedlings present at all sites
Urza and Sibold 2017 Northern Rocky Mountains >100 m
Stevens-Rumann et al. 2015 Northern Rocky Mountains Distance not specified
Stevens-Rumann and Morgan 2016 Northern Rocky Mountains Distance not specified
Stevens-Rumann et al. 2018 Northern Rocky Mountains 200 m
Turner et al. 2004 Northern Rocky Mountains “Distance to unburned forest was significant but explained only 3% … of variation”
Turner et al. 2016 Northern Rocky Mountains 0 No difference detected