Ecological Archives E096-067-A2

Melissa Whitman and James D. Ackerman. 2015. Terrestrial orchids in a tropical forest: best sites for abundance differ from those for reproduction. Ecology 96:693–704. http://dx.doi.org/10.1890/14-0104.1

Appendix B. Isometric and allometric scaling of leaf traits, reproductive effort and size-density relationships. Tables include linear regression results; Reduce Major Axis (RMA) slope and confidence intervals; and significance of differences between observed and predicted slopes.

Tables include linear regression results; Reduce Major Axis (RMA) slope and confidence intervals; as well as significance of differences between observed and predicted slopes.

Table B1. Isometric and allometric scaling of leaf traits.

Leaf Traits

All values log 10 transformed

Linear Regression

Reduced Major Axis (RMA)

n

R²

P value

Observed
Slope

95% Confidence
Interval

Predicted Slope
(Isometric)

P value

Lamina area (cm²) ∝ Number of leaves

218

0.13

< 0.001

2.13

1.88 - 2.40

2/1 (2.0)

0.33

Lamina area (cm²) ∝ Petiole length (cm)

218

0.68

< 0.001

1.55

1.43 - 1.67

2/1 (2.0)

< 0.001

Lamina width (cm) ∝ Lamina length (cm)

218

0.90

< 0.001

1.16

1.12 - 1.21

1/1 (1.0)

< 0.001

 

Table B2. Isometric and allometric scaling of reproductive effort.

Reproductive Effort

All values log 10 transformed

Linear Regression

Reduced Major Axis (RMA)

n

R²

P value

Observed
Slope

95% Confidence
Interval

Predicted Slope
(Isometric)

P value

Scape length (mm) ∝ Lamina area (cm²)

30

0.37

< 0.001

0.62

0.45 - 0.83

1/2 (0.5)

0.18

Total flowers (#) ∝ Lamina area (cm²)

30 

0.50

< 0.001

0.98

0.75 - 1.28

3/2 (1.5)

0.003

  

Table B3. Testing predicted plant size-density relationship for herbaceous monocots.

Plant Size as a Function of Density

All values log 10 transformed; only sites with > 1 orchid

Linear Regression

Reduced Major Axis (RMA)

n

R²

P value

Observed
Slope

95% Confidence
Interval

Predicted
Slope
(Weller, 1987)

P value

Lamina area (cm²) for the smallest individual ∝ Total orchid density (m²), per subplot

39

0.48

< 0.001

-1.5

-1.90 - (-1.19)

- 0.44

< 0.001

Lamina area (cm²) for the largest individual ∝ Total orchid density (m²), per subplot

39

0.13

0.015

0.67

0.49 - 0.90

- 0.44

< 0.001

[Back to E096-067]