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Table 1 Analysis of the final dry massses of the native and Carpobrotus plants in the pots containing two plants

From: A test of native plant adaptation more than one century after introduction of the invasive Carpobrotus edulis to the NW Iberian Peninsula

Effect

Final log mass of native species

Final mass of Carpobrotus plants

Advantage/slope

LRT P

Relative AIC weight

Selected model P value

Advantage/slope

LRT P

Relative AIC weight

Selected model P value

Exposure

Non-exposed

0.345

0.574

0.365

Unexposed

0.887

0.372

0.271

Origin of Carpobrotus

African

0.063

2.076

0.675

European

26 × 10–6

23 × 104

1.000

Native species

Artemisia

0.004

24.115

0.960

Helichrysum

0.022

5.132

0.837

Initial Mass Carpobrotus

0.097

0.355

0.527

0.345

− 0.791

0.159

0.991

0.498

Initial Mass Native species

0.024

0.019

1.836

0.647

0.101

0.036

1.127

0.530

Exp. × Orig. C

 

0.396

0.528

0.345

 

0.018

6.070

0.858

Exp. × Nat. sp.

 

0.521

0.452

0.311

 

0.968

0.368

0.269

Ori C. × Nat. sp.

 

0.005

19.071

0.950

 

0.028

4.062

0.802

Exp. × Orig. C. × Nat. sp.

 

0.993

0.368

0.269

 

0.019

5.663

0.850

  1. Columns show the levels of the main factors at advantage for final mass or the estimated slopes for the covariables, the Likelihood Ratio Tests probability for each model term, the AIC weight and the normalized probability that the model including that term is preferred. In both analyses, the residual degrees of freedom were 28 (only pots having data for the native and the Carpobrotus plant were analysed). The masses of native plants were logarithmically transformed to improve the normality and variance homogeneity of the model residuals. After this transformation, the masses of both native plants and Carpobrotus were normally distributed, as indicated by the Shapiro—Wilks normality test (P = 0.107 and P = 0.973) and Bartletts' homogeneity of variance test (P = 0.767 and P = 0.653)