Posthurricane recovery of riverine fauna reflected in the diet of an apex predator
Stevens, PW, DA Blewett, TR Champeau, and CJ Stafford
PRIMER Statistics (Primer Version 6.1.6)
MDS
Non-metric Multi-Dimensional Scaling
Resemblance worksheet
Name: Resem1
Data type: Similarity
Selection: All
Parameters
Kruskal stress formula: 1
Minimum stress: 0.01
Best 3-d configuration (Stress: 0.01)
Sample 1 2 3 %
Fall 04 -0.89 -0.30 -0.04 1.9
Winter 05 -0.87 -0.27 0.02 2.2
Spring 05 -0.87 -0.15 -0.08 6.1
Summer 05 0.79 -0.37 0.00 1.5
Fall 05 0.79 -0.37 0.06 29.3
Winter 06 0.18 0.98 -0.81 20.6
Spring 06 0.79 -0.37 -0.06 16.9
Summer 06 0.07 0.85 0.91 21.5
Best 2-d configuration (Stress: 0.04)
Sample 1 2 %
Fall 04 1.23 -0.15 4.5
Winter 05 1.02 0.09 14.1
Spring 05 0.42 -0.28 15.5
Summer 05 -0.39 0.34 8.2
Fall 05 -0.43 -0.51 24.0
Winter 06 -1.02 -1.01 8.6
Spring 06 -0.19 0.14 12.9
Summer 06 -0.64 1.38 12.2
STRESS VALUES
Repeat 3D 2D
1 0.01 0.04
2 0.01 0.04
3 0.01 0.1
4 0.01 0.04
5 0.01 0.14
6 0.01 0.04
7 0.01 0.04
8 0.01 0.04
9 0.01 0.14
10 0.01 0.04
11 0.01 0.04
12 0.01 0.1
13 0.01 0.04
14 0.01 ** 0.04
15 0.01 0.04
16 0.01 0.04
17 0.01 0.04
18 0.01 0.04
19 0.01 0.04
20 0.01 0.04
21 0.14 0.04
22 0.01 0.1
23 0.01 0.04
24 0.01 0.04
25 0.01 0.04
** = Maximum number of iterations used
3-d : Minimum stress: 0.01 occurred 24 times
2-d : Minimum stress: 0.04 occurred 20 times
Outputs
Plot: Graph2
Plot: Graph3
SIMPER
Groups Pre & Post
Average dissimilarity = 81.34
Group Pre Group Post
Species Av.Abund Av.Abund Av.Diss Diss/SD Contrib% Cum.%
Hoplosternum littorale 0.63 0.28 23.87 1.01 29.35 29.35
Procambarus 0.17 0.58 22.27 0.93 27.38 56.72
Gambusia holbrooki 0.48 0.00 10.51 0.44 12.92 69.64
Ictaluridae 0.00 0.12 5.19 0.35 6.38 76.03
Callinectes sapidus 0.12 0.00 4.42 0.32 5.43 81.46
Oreochromis aureus 0.03 0.07 3.91 0.30 4.80 86.26
Hemichromis letourneauxi 0.00 0.08 2.65 0.22 3.26 89.53
Xanthidae 0.00 0.04 1.07 0.13 1.31 90.84
Groups Pre & Summer 06
Average dissimilarity = 92.90
Group Pre Group Summer 06
Species Av.Abund Av.Abund Av.Diss Diss/SD Contrib% Cum.%
Hoplosternum littorale 0.63 0.00 23.74 0.99 25.55 25.55
Xanthidae 0.00 0.68 20.59 0.73 22.16 47.71
Procambarus 0.17 0.46 19.71 0.88 21.21 68.93
Gambusia holbrooki 0.48 0.00 10.12 0.44 10.90 79.82
Callinectes sapidus 0.12 0.06 6.38 0.40 6.86 86.69
Gobiosoma spp. 0.00 0.20 5.86 0.36 6.30 92.99
Groups Post & Summer 06
Average dissimilarity = 81.85
Group Post Group Summer 06
Species Av.Abund Av.Abund Av.Diss Diss/SD Contrib% Cum.%
Procambarus 0.58 0.46 24.01 1.07 29.33 29.33
Xanthidae 0.04 0.68 22.09 0.76 26.99 56.32
Hoplosternum littorale 0.28 0.00 10.92 0.60 13.34 69.67
Gobiosoma spp. 0.00 0.20 6.11 0.37 7.47 77.13
Ictaluridae 0.12 0.00 5.15 0.35 6.29 83.42
Oreochromis aureus 0.07 0.00 3.00 0.26 3.67 87.09
Callinectes sapidus 0.00 0.06 2.84 0.25 3.48 90.57
RELATE
Testing matched resemblance matrices
Resemblance worksheet
Name: Resem1
Data type: Similarity
Selection: All
Secondary data: Result of seriation
Parameters
Rank correlation method: Spearman
Sample statistic (Rho): 0.572
Significance level of sample statistic: 0.1 %
Number of permutations: 999
Number of permuted statistics greater than or equal to Rho: 0