Ecological Archives E091-008-A1

Mary Bricker, Dean Pearson, and John Maron. 2010. Small-mammal seed predation limits the recruitment and abundance of two perennial grassland forbs. Ecology 91:85–92.

Appendix A. Rates of cumulative emergence, establishment, and mortality, for seed addition plots by seed density and small-mammal exclusion treatment. Data are from the cohort of seeds added in 2004.

TABLE A1. Rate of emergence (number of seedlings emerged, per added seed), by seed addition density and small-mammal exclusion treatment.

Emergence Rate

 

 

Exclosure

Control

Species

Seed density

Mean

SE

Mean

SE

Lupinus

25

0.354

0.078

0.160

0.065

Lupinus

50

0.300

0.040

0.226

0.084

Lupinus

100

0.304

0.073

0.129

0.063

Lupinus

200

0.339

0.065

0.084

0.033

Lithospermum

50

0.197

0.035

0.106

0.039

Lithospermum

100

0.200

0.041

0.046

0.017

Lithospermum

200

0.209

0.040

0.070

0.047

Lithospermum

300

0.170

0.042

0.062

0.043

 

TABLE A2. Rate of establishment (number of plants established at final census, per added seed), by seed addition density and small-mammal exclusion treatment.

Establishment Rate

 

 

Exclosure

Control

Species

Seed density

Mean

SE

Mean

SE

Lupinus

25

0.137

0.058

0.040

0.028

Lupinus

50

0.080

0.047

0.046

0.022

Lupinus

100

0.124

0.062

0.033

0.013

Lupinus

200

0.116

0.050

0.031

0.017

Lithospermum

50

0.043

0.009

0.057

0.027

Lithospermum

100

0.079

0.022

0.016

0.010

Lithospermum

200

0.069

0.028

0.051

0.035

Lithospermum

300

0.059

0.014

0.037

0.024

 

TABLE A3. Rate of mortality in seed addition plots (number of plants that died, divided by the total number emerged in each plot), by seed addition density and small-mammal exclusion treatment.

Mortality Rate

 

 

Exclosure

Control

Species

Seed density

Mean

SE

Mean

SE

Lupinus

25

0.604

0.142

0.756

0.093

Lupinus

50

0.728

0.108

0.766

0.081

Lupinus

100

0.663

0.129

0.505

0.145

Lupinus

200

0.689

0.096

0.724

0.096

Lithospermum

50

0.692

0.088

0.469

0.185

Lithospermum

100

0.540

0.109

0.711

0.109

Lithospermum

200

0.686

0.091

0.537

0.179

Lithospermum

300

0.567

0.117

0.262

0.164


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