Ecological Archives C006-048-A1
Nicholas A. Fisichelli, Artur Stefanski, Lee E. Frelich, and Peter B. Reich. 2015. Temperature and leaf nitrogen affect performance of plant species at range overlap. Ecosphere 6:186. http://dx.doi.org/10.1890/es15-00115.1
Appendix A. Temperature and leaf nitrogen affect performance of plant species at range overlap.
Table A1. Fixed effects parameter estimates from generalized linear mixed-effects models of sapling survival over four years.
Acer saccharum |
|
|
|
|
Parameter |
Value |
SE |
t value |
P value |
Intercept |
2.25 |
0.26 |
8.67 |
<0.0001 |
sqrt(initial size) |
0.09 |
1.27 |
0.07 |
0.94 |
log(light) |
0.24 |
0.55 |
0.44 |
0.66 |
Leaf N (%) |
2.96 |
0.90 |
3.29 |
0.001 |
Abies balsamea |
||||
Parameter |
Value |
SE |
t-value |
P-value |
Intercept |
4.98 |
1.33 |
3.73 |
0.0002 |
sqrt(initial size) |
7.09 |
2.12 |
3.34 |
0.0008 |
log(light) |
0.03 |
0.92 |
0.03 |
0.97 |
Browse |
-0.63 |
0.18 |
-3.53 |
0.0004 |
Temperature (JJA) |
-0.93 |
0.79 |
-1.18 |
0.24 |
Size X Browse |
-1.34 |
0.58 |
-2.33 |
0.02 |
Light X Temp |
3.12 |
1.27 |
2.45 |
0.01 |
Fig. A1. Fourteen study sites located across the temperate-boreal transition zone in Minnesota, USA, and containing the overlapping range limits of Acer saccharum and Abies balsamea. Range limits of study species modified from Little, E.L. 1971. Atlas of United States trees: Vol. 1. Conifers and important hardwoods. US Dep. Agric. Misc. Publ 1146.
Fig. A2. A. balsamea survival response to stem length by browse pressure interaction (10th percentile [0%] and 80th percentile [40%] browse damage values shown). 95% prediction intervals shown.
Fig. A3. Radial growth trends across the temperate-boreal transition zone. 95% prediction intervals shown for 1 cm diameter stems.
