Ecological Archives E091-195-A2

Jennifer G. Howeth and Mathew A. Leibold. 2010. Species dispersal rates alter diversity and ecosystem stability in pond metacommunities. Ecology 20:2727–2741.

Appendix B. Analysis of beta-diversity of zooplankton as a function of dispersal rate.

TABLE B1. Effects of planktonic dispersal rate on beta-diversity (Jaccard’s dissimilarity) of zooplankton in pond metacommunities.  Results reported from repeated measures ANOVA for the three pairwise community comparisons within the metacommunity.
 

Diversity response

   df

SS

F

P value

Press no predation to press predation  

Dispersal

2

0.11

0.71

0.517

Time

11

0.36

1.68

0.089 (0.032)

Time × disp

22

0.72

1.67

0.045 (0.091)

Press no predation to pulsed predation§

Dispersal

2

0.53

1.26

0.329

Time

11

1.24

3.40

0.001

Time × disp

22

0.80

1.10

0.364

Press predation to pulsed predation

Dispersal

2

0.01

0.11

0.897

Time

11

0.25

2.51

0.007

Time × disp

22

0.18

0.87

0.638

§ arcsine square-root transformed
Probability values from final 7 wk of the experiment are noted in parenthesis, if the significance level is different from the 12 wk analysis.


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