Skip to main content
. 2012 Jun 28;8:14. doi: 10.1186/2046-9063-8-14

Table 3.

Results of null-model analyses of species co-occurrences of larval black flies

Data set Season  
 
 Spring
 Summer
FULL data set
Observed C-score
 33.47
 30.56
Mean C-score 1
 31.99
 29.13
p 2
 <0.0001
 <0.0001
effect size 3
 5.15
 4.25
n
 57
 53
HIGH subset
Observed C-score
 15.78
 17.08
Mean C-score
 15.39
 16.40
p
 <0.0204
 <0.0001
effect size
 2.24
 4.10
n
 39
 36
LOW subset
Observed C-score
 5.11
 5.42
Mean C-score
 4.69
 5.40
p
 0.0002
 0.5890
effect size
 4.26
 0.11
n
 18
 17
MOUNTAIN ECOREGION
Observed C-score
 6.39
 6.72
Mean C-score
 6.41
 2.62
p
 0.5280
 >0.0001
effect size
 -0.09
 7.25
n
 18
 17
PIEDMONT ECOREGION
Observed C-score
 4.32
 13.53
Mean C-score
 3.86
 13.08
p
 0.0110
 0.0790
effect size
 2.95
 1.49
n
 16
 31
SANDHILLS ECOREGION4
Observed C-score
 7.06
 -
Mean C-score
 7.00
 -
p
 0.2580
 -
effect size
 0.63
 -
n 19 -

1 Mean C-scores are the means from the test distribution generated using the randomization algorithms.

2 p is the probability of a C-score > observed C-score under a random model

3 effect size was calculated as (Cobs – Cm)/SD, where Cobs = observed C-score, Cm = mean C-score of the test distribution, and SD = standard deviation of the test distribution.

4 Due to the low number of sites (n = 6), null-model analysis was not performed for Sandhills collections in the summer.