TABLE 1.
Results of linear models for the effect of selected factors, as obtained after the preliminary screening process for each of the four sites, on chlorophyll a and Bray-Curtis dissimilarity index as an estimate of community composition shift based on bacterial phyla and cyanobacteriaa
| Dependent variable | Fort Bliss |
Jornada |
Nosecone |
Burr Buttercup |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Factor (level) | df | F | P | Factor (level) | df | F | P | Factor (level) | df | F | P | Factor (level) | df | F | P | |
| Chl a content | Water (+) | 1 | 4.14 | 0.039 | Water (+) | 1 | 11.03 | 0.005 | Light (−) | 1 | 8.99 | 0.009 | Water (+) | 1 | 10.84 | 0.005 |
| Light (−) | 1 | 3.97 | 0.042 | Light (−) | 1 | 5.56 | 0.034 | Water (+) | 1 | 6.24 | 0.024 | Light (−) | 1 | 9.92 | 0.006 | |
| Nutrients (P+N) | 2 | 3.87 | 0.047 | Nutrients (P) | 2 | 3.94 | 0.041 | |||||||||
| BC (bacterial phyla) | Inoculum (S) | 1 | 6.41 | 0.024 | Inoculum (S) | 1 | 5.49 | 0.041 | Water (+) | 1 | 6.16 | 0.027 | Nutrients (P+N) | 2 | 11.78 | 0.001 |
| Nutrients (P) | 2 | 4.81 | 0.026 | Nutrients (P) | 2 | 3.97 | 0.040 | Light (−) | 1 | 5.95 | 0.029 | Inoculum (S) | 1 | 10.43 | 0.008 | |
| Nutrients (N) | 2 | 3.88 | 0.047 | Calcium (+) | 1 | 8.83 | 0.012 | |||||||||
| Water (+) | 1 | 7.81 | 0.017 | |||||||||||||
| Light (−) | 1 | 6.63 | 0.023 | |||||||||||||
| BC (cyanobacteria) | Inoculum (S) | 1 | 3.99 | 0.048 | Water (+) | 1 | 6.65 | 0.021 | Inoculum (S) | 1 | 9.65 | 0.008 | ||||
| Calcium (−) | 1 | 5.85 | 0.029 | Light (−) | 1 | 6.18 | 0.025 | Water (+) | 1 | 6.07 | 0.028 | |||||
| Nutrients (P+N) | 2 | 4.84 | 0.026 | |||||||||||||
a
In parentheses, levels of factors that maximized the production of biomass (chlorophyll a [Chl a]) or minimized changes in community composition (Bray-Curtis [BC] based on bacterial phyla or cyanobacteria) according to LS means tests (P ≤ 0.05) (P, addition of phosphorus; N, addition of nitrogen; S, slurry-like inoculum).