Ecological Archives E096-069-A4

Byju N. Govindan, Zhilan Feng, Yssa D. DeWoody, and Robert K. Swihart. 2015. Intermediate disturbance in experimental landscapes improves persistence of beetle metapopulations. Ecology 96:728736. http://dx.doi.org/10.1890/14-0044.1

Appendix D. Model-averaged estimates of selected predictor variables for extinction-colonization rates, and pairwise comparisons of the eight treatments for selected parameters.

Table D1. AICc based model averaged estimates (± adjusted standard error) of predictor variables for landscape-level colonization and extinction rates. An asterisk indicates that the 95% credible interval did not contain zero.

Response

Variable

Intercept

Predictors (Coefficient ± adjusted SE)1

RS

PC

PD

RS  X PC

RS X PC*PD

c

0.47 ± 0.04 *

0.07 ± 0.05

0.28 ± 0.06*

0.06 ± 0.04

-0.14 ± 0.06*

 

e

0.11 ± 0.01*

0.01 ± 0.01

0.08 ± 0.01*

0.04 ± 0.01*

 

 

 

Table D2. Mean (and SD) of landscape-level metapopulation attributes for the eight treatments. Treatment means without shared superscripts are different from each other (Tukey sandwich HSD, P < 0.05).

Trt #

RS

PC

PD

N

e

c

1

Homogeneous

High

Fast

3.20bc  (0.32)

0.19c
(0.03)

0.75d
(0.05)

1.99ef   (0.13)

2

Homogeneous

High

Slow

2.87b   (0.16)

0.12b
(0.01)

0.75d  (0.05)

0.75   (0.04)

3 *

Homogeneous

Low

Fast

3.56c
(0.24)

0.10ab   (0.02)

0.52c   (0.04)

2.65  (0.27)

4

Homogeneous

Low

Slow

3.69abc   (0.49)

0.07a   (0.03)

0.37a   (0.08)

1.39bc  (0.34)

5 **

Heterogeneous

High

Fast

3.61c
(0.21)

0.18c   (0.01)

0.69bd   (0.01)

2.13de   (0.02)

6

Heterogeneous

High

Slow

3.49c
(0.25)

0.14bc   (0.02)

0.66bd  (0.04)

0.88a
(0.04)

7 **

Heterogeneous

Low

Fast

4.27a
(0.20)

0.10ab   (0.00)

0.50abc   (0.15)

2.86bcdfg   (0.85)

8 **

Heterogeneous

Low

Slow

4.53a
(0.33)

0.08a    (0.02)

0.49ac  (0.09)

1.06a   (0.15)

*or ** Mean ± SD is based on two replicates [* One replicate for treatment #3 suffered fungal infestation; ** 95% credible interval for the dispersal rate for one replicate each for treatments #5, #7, and #8 contained zero]. RS, PC, and PD denote the predictor variables resource structure, patch connectivity and patch dynamics respectively. The response variables N, e, c and denote mean abundance of beetles, extinction rate, colonization rate, and extinction threshold respectively, all estimated at the landscape-level.


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