Ecological Archives E096-189-A1

Pedro Daleo, Juan Alberti, Carlos Martín Bruschetti, Jesús Pascual, Oscar Iribarne, and Brian R. Silliman. 2015. Physical stress modifies top-down and bottom-up forcing on plant growth and reproduction in a coastal ecosystem. Ecology 96:2147–2156. http://dx.doi.org/10.1890/14-1776.1

Appendix A. Results of linear mixed-effects models evaluating the effect of nutrients, herbivory, and salinity on biomass production of the salt marsh plant Spartina densiflora.

Table A1. Results of linear mixed-effects models evaluating the effect of nutrients, herbivory, and salinity on biomass production of the salt marsh plant Spartina densiflora. Nutrients, salinity, and herbivory were treated as fixed factors, and plot was treated as a random factor.

Source of variation	df	F	P
Total biomass
Nutrients (N)	1, 20	407.18	< 0.001
Salt (S)	1, 20	29.20	< 0.001
Herbivory (H)	1, 19	5.22	<  0.05
N × S	1, 20	0.02	0.877
N × H	1, 19	8.71	< 0.01
H × S	1, 19	2.22	0.152
N × H × S	1, 19	0.15	0.700
Aboveground biomass
N	1, 20	409.39	< 0.001
S	1, 20	15.09	< 0.001
H	1, 19	11.15	< 0.005
N × S	1, 20	0.02	0.881
N × H	1, 19	6.11	< 0.05
H × S	1, 19	1.42	0.248
N × H × S	1, 19	0.31	0.582
Belowground biomass
N	1, 20	38.44	< 0.001
S	1, 20	4.86	< 0.05
H	1, 19	1.96	0.178
N × S	1, 20	0.19	0.669
N × H	1, 19	6.53	< 0.05
H × S	1, 19	3.48	0.078
N × H × S	1, 19	1.57	0.226
Above- to belowground biomass
N	1, 20	34.38	< 0.001
S	1, 20	17.02	< 0.001
H	1, 19	0.53	0.476
N × S	1, 20	0.24	0.627
N × H	1, 19	1.07	0.313
H × S	1, 19	1.31	0.266
N × H × S	1, 19	2.68	0.118

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