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Table 3 Significant model parameter results for M. maximus, L. leucocephala, and U. virgata probability of occurrence (ѱ) derived from cross-transect surveys conducted along the 570-m bulldozed trail in the Ensenada section of Guánica Forest

From: Spread of common native and invasive grasses and ruderal trees following anthropogenic disturbances in a tropical dry forest

Models

β x parameter

Megathyrsus maximus

Leucaena leucocephala

Uniola virgata

ѱ (Dist_z)

β 1 (Dist_z)

−1.09 ± 0.28***

−1.12 ± 0.26***

2.21 ± 0.41***

ѱ (Time)

β 1 (Dist_z)

−1.18 ± 0.30***

−1.28 ± 0.29***

4.12 ± 0.93***

β 2 (Jul-2012)

−2.63 ± 0.60***

−2.42 ± 0.56***

−6.32 ± 1.41***

β 3 (Dec-2012)

1.62 ± 0.69*

2.13 ± 0.67**

5.58 ± 1.41***

β 4 (Jul-2013)

1.77 ± 0.69*

1.83 ± 0.66**

5.95 ± 1.48***

ѱ (NatVeg)

β 1 (Dist_z)

−1.33 ± 0.33***

−1.39 ± 0.31***

4.11 ± 0.92***

β 2 (Jul-2012)

0.59 ± 1.61

0.15 ± 1.57

−5.20 ± 14.98

β 3 (Dec-2012)

1.53 ± 0.71*

2.07 ± 0.68**

5.58 ± 1.42***

β 4 (Jul-2013)

1.81 ± 0.71*

1.87 ± 0.68**

5.95 ± 1.48***

β 5 (natural regeneration)

−3.33 ± 1.59*

−2.66 ± 1.54

−1.12 ± 14.92

ѱ (NatColo)

β 1 (Dist_z)

−1.18 ± 0.30***

N/A

N/A

β 2 (Jul-2012)

−2.58 ± 0.61***

N/A

N/A

β 3 (Dec-2012)

1.69 ± 0.73*

N/A

N/A

β 4 (Jul-2013)

1.85 ± 0.73*

N/A

N/A

β 5 (Uniola and Leucaena)

−0.17 ± 0.55

N/A

N/A

ѱ (GrassColo)

β 1 (Dist_z)

N/A

−1.28 ± 0.29***

N/A

β 2 (Jul-2012)

N/A

−2.42 ± 0.58***

N/A

β 3 (Dec-2012)

N/A

2.12 ± 0.70**

N/A

β 4 (Jul-2013)

N/A

1.83 ± 0.69**

N/A

β 5 (Megathyrsus and Uniola)

N/A

0.01 ± 0.52

N/A

ѱ (InvColo)

β 1 (Dist_z)

N/A

N/A

4.20 ± 1.04***

β 2 (Jul-2012)

N/A

N/A

−6.44 ± 1.56***

β 3 (Dec-2012)

N/A

N/A

5.60 ± 1.44***

β 4 (Jul-2013)

N/A

N/A

5.97 ± 1.50***

β 5 (Megathyrsus and Leucaena)

N/A

N/A

0.19 ± 0.96

ѱ (AllColoNat)

β 1 (Dist_z)

−1.34 ± 0.33***

N/A

N/A

β 2 (Jul-2012)

0.77 ± 1.65

N/A

N/A

β 3 (Dec-2012)

1.65 ± 0.74*

N/A

N/A

β 4 (Jul-2013)

1.93 ± 0.75**

N/A

N/A

β 5 (Uniola and Leucaena)

−0.29 ± 0.56

N/A

N/A

β 6 (native vegetation)

−3.43 ± 1.62*

N/A

N/A

ѱ (AllColoGrass)

β 1 (Dist_z)

N/A

−1.39 ± 0.31***

N/A

β 2 (Jul-2012)

N/A

0.19 ± 1.59

N/A

β 3 (Dec-2012)

N/A

2.09 ± 0.70**

N/A

β 4 (Jul-2013)

N/A

1.89 ± 0.71**

N/A

β 5 (Megathyrsus and Uniola)

N/A

−0.06 ± 0.53

N/A

β 6 (native vegetation)

N/A

−2.67 ± 1.55

N/A

ѱ (AllColoInv)

β 1 (Dist_z)

N/A

N/A

4.20 ± 1.04***

β 2 (Jul-2012)

N/A

N/A

−5.34 ± 15.55

β 3 (Dec-2012)

N/A

N/A

5.60 ± 1.44***

β 4 (Jul-2013)

N/A

N/A

5.97 ± 1.50***

β 5 (Megathyrsus and Leucaena)

N/A

N/A

0.19 ± 0.96

β 6 (native vegetation)

N/A

N/A

−1.10 ± 15.48

  1. All models were tested for significance at α ≤ 0.01 (*), α ≤ 0.001 (**), α ≤ 0.00001 (***)