Ecological Archives E089-061-A1

Jennifer A. Lau. 2008. Beyond the ecological: biological invasions alter natural selection on a native plant species. Ecology 89:1023–1031.

Appendix A. Estimates of selection differentials for Lotus tolerance, resistance, and competitive ability in each environment.

TABLE A1. Estimates of selection differentials ± 1 SE for each Lotus trait in each environment. survival is calculated from logistic regressions of survival on the standardized trait value. avgrad is the transformed version of survival (Janzen and Stern 1998). This transformation makes the estimates directly comparable to selection differentials estimated from fecundity (traditional linear regressions) to allow application to predictive microevolutionary equations. fecundity is the covariance between family means for relative seed production and the trait, averaged across all plots in a given treatment. Estimates of fecundity based on per plot estimates are not presented because so few individuals survived to set seed in many plots.

 

Tolerance

Resistance

Competitive response

Environment

survival

avgrad

fecundity

survival

avgrad

fecundity

survival

avgrad

fecundity

Medicago present/
No insecticide

0.30±0.18

0.29±0.14

1.17

-0.11±0.21

-0.10±0.16

-0.27

0.26±0.27

0.19±0.21

1.25

Medicago removed/
No insecticide

0.13±0.16

0.09±0.13

0.42

0.37±0.19

0.33±0.14

0.01

-0.3±0.24

-0.05±0.20

0.01

Uninvaded/
No insecticide

-0.10±0.17

0.03±0.13

0.40

0.00±0.17

-0.03±0.14

-0.10

-0.23±0.34

-0.07±0.29

-0.07

Medicago present/
Insecticide

-0.25±0.16

-0.17±0.13

-0.98

-0.25±0.20

-0.18±0.14

-0.28

-0.14±0.24

-0.09±0.20

0.78

Medicago removed/
Insecticide

-0.10±0.16

-0.09±0.13

-0.56

-0.23±0.19

-0.11±0.14

-0.39

0.00±0.24

-0.05±0.20

-0.36

Uninvaded/
Insecticide

0.00+0.17

-0.02±0.13

-0.42

-0.11±0.17

-0.06±0.14

0.01

0.01±0.34

0.03±0.29

-0.43

Janzen, F. J., and H. S. Stern. 1998. Logistic regression for empirical studies of multivariate selection. Evolution 52:1564–1571.



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