Ecological Archives E093-077-A3

Margarita Brandt, Jon D. Witman, and Angel I. Chiriboga. 2012. Influence of a dominant consumer species reverses at increased diversity. Ecology 93:868–878.

Appendix C (TABLE C1). A table listing SIMPER (similarity of percentages) analyses of taxa and other substrate types contributing to the differences in benthic community structure between two-species urchin multi-assemblages.

Multi-assemblages
comparison
Taxa/substrate type Avg. abundance
in Eucidaris
+ Lytechinus
Avg. abundance
in Eucidaris
+ Tripneustes
Diss/SD Avg.
contribution
(%)
Eucidaris
+
Lytechinus

vs.

Eucidaris
+
Tripneustes
Dyctiota divaricata 4.45 0.04 2.52 9.99
Sediment 27.41 2.26 4.47 8.96
Rhodymenia sp. 1.18 0 6.39 8.65
Diatoms 6.5 20.34 1.89 7.76
Ceramium sp. 2.46 0.59 1.38 6.87
Dark brown crustose 0 6.71 0.78 6.17
Light brown crustose 4.56 0.38 0.86 5.71
Megabalanus sp. 0.21 0.68 1.3 4.79
Jania sp. 0.61 0.89 1.19 4.57
Substrate grazed 23.44 51.92 1.87 4.37
Tedania sp. 0.33 0.3 1.41 4.29
Pyura cf. haustor 0.06 0.36 1.47 4.23
Lithothamnium sp. 13.43 7.77 1.68 4.04
Gelidium sp. 0 0.42 0.75 3.52
Ulva sp. 14.59 6.11 1.75 3.51
Serpulorbis margaritaceus 0.1 0.1 1.02 2.98
Multi-assemblages
comparison
Taxa/substrate type Avg. abundance
in Eucidaris
+ Lytechinus
Avg. abundance
in Lytechinus
+ Tripneustes
Diss/SD Avg.
contribution
(%)
Eucidaris
+
Lytechinus

vs.

Lytechinus
+
Tripneustes
Sediment 27.41 1.38 2.3 11.92
Brown turfing alga 0 4.62 1.93 9.03
Dyctiota divaricata 4.45 0.04 2.38 8.88
Rhodymenia sp. 1.18 0 7.07 7.54
Ceramium sp. 2.46 0 1.65 7.27
Gelidium sp. 0 0.78 7.42 6.73
Diatoms 6.5 14.19 2.2 5.88
Brown crustose 0 1.06 1.2 5.15
Substrate grazed 23.44 62.06 2.84 4.72
Jania sp. 0.61 1.26 1.27 4.56
Ulva sp. 14.59 3.76 2.68 4.15
Tedania sp. 0.33 0.46 1.41 3.99
Megabalanus sp. 0.21 0.8 1.03 3.95
Light brown crustose 4.56 0 0.49 3.31
Lithothamnium sp. 13.43 9.1 1.89 3.3
Multi-assemblages
comparison
Taxa/substrate type Avg. abundance
in Eucidaris
+ Tripneustes
Avg. abundance
in Lytechinus
+ Tripneustes
Diss/SD Avg.
contribution
(%)
Eucidaris
+
Tripneustes

vs.

Lytechinus
+
Tripneustes  
Brown turfing alga 0 4.62 1.91 13.45
Dark brown crustose 6.71 0 0.78 7.99
Brown crustose 0 1.06 1.19 7.67
Sediment 2.26 1.38 1.28 7.43
Jania sp. 0.89 1.26 1.4 6.92
Gelidium sp. 0.42 0.78 1.82 6.82
Megabalanus sp. 0.68 0.8 1.37 6.82
Pyura cf. haustor 0.36 0.28 1.26 5.53
Serpulorbis margaritaceus 0.1 0.18 1.02 4.22
Tedania sp. 0.3 0.46 1.07 4.22
Light brown crustose 0.38 0 0.79 4.18
Ceramium sp. 0.59 0 0.73 4.17
Polysiphonia sp. 0.96 0 0.49 3.01
Spirorbis 0.08 0 0.8 2.83
Dyctiota divaricata 0.04 0.04 0.67 2.5
Ulva sp. 6.11 3.76 1.38 2.45

Note: Average dissimilarities are as follows:

Eucidaris + Lytechinus vs. Eucidaris + Tripneustes: 38.77
Eucidaris + Lytechinus vs. Lytechinus + Tripneustes: 45.87
Eucidaris + Tripneustes vs. Lytechinus + Tripneustes: 31.30


[Back to E093-077]