Ecological Archives E095-073-A3

Nathan D. Jackson, Lenore Fahrig. 2014. Landscape context affects genetic diversity at a much larger spatial extent than population abundance. Ecology 95:871–881. http://dx.doi.org/10.1890/13-0388.1

Appendix C. Standardized and mean-centered regression coefficients.

Table C1. Standardized and mean-centered coefficients from regressions of abundance, presence/absence, allelic richness, and expected heterozygosity on landscape structure and average dispersal distance (Dav).

 

Abundance (N)

Presence/Absence (PA)

Factor

Standardize

Mean-Center

Standardize

Mean-Center

Intercept

-0.145 (0.005)

158.100 (0.550)

1.797 (0.061)

1.797 (0.061)

PLANDS

0.980 (0.006)

5.382 (0.032)

5.603 (0.115)

0.206 (0.004)

CLUMPYS

0.263 (0.006)

0.009 (0.000)

2.215 (0.071)

0.001 (0.000)

Dav

-0.374 (0.004)

-15.550 (0.150)

0.173 (0.052)

0.061 (0.019)

PLANDS:CLUMPYS

-0.181 (0.004)

0.000 (0.000)

0.224 (0.082)

0.000 (0.000)

PLANDS:Dav

-0.052 (0.006)

-0.102 (0.012)

0.032 (0.115)

0.000 (0.001)

CLUMPYS:Dav

-0.067 (0.006)

-0.001 (0.000)

-0.139 (0.064)

0.000 (0.000)

 

Allelic Richness (A)

Heterozygosity (He)

Factor

Standardize

Mean-Center

Standardize

Mean-Center

Intercept

-0.048 (0.003)

8.328 (0.017)

0.005 (0.000)

-1.300 (0.003)

PLANDS

1.056 (0.003)

0.247 (0.001)

-0.135 (0.001)

-0.031 (0.000)

CLUMPYS

0.359 (0.003)

0.001 (0.000)

-0.047 (0.001)

0.000 (0.000)

Dav

-0.077 (0.003)

-0.146 (0.006)

0.009 (0.000)

0.017 (0.001)

PLANDS:CLUMPYS

-0.105 (0.003)

0.000 (0.000)

0.011 (0.000)

0.000 (0.000)

PLANDS:Dav

0.118 (0.003)

0.010 (0.000)

-0.017 (0.001)

-0.001 (0.000)

CLUMPYS:Dav

0.015 (0.003)

0.000 (0.000)

0.000 (0.000)

0.000 (0.000)

Notes: To mean-center coefficients, we subtracted from each predictor its mean value. These coefficients thus reflect the slope of each predictor when other predictors are at their mean values. Standard errors are given parenthetically. PLANDS = habitat amount at scale of effect, S. CLUMPYS = habitat fragmentation at scale of effect, S.


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