Ecological Archives M081-012-A2

Xinwei Wu, J. Emmett Duffy, Peter B. Reich, Shucun Sun. 2011. A brown-world cascade in the dung decomposer food web of an alpine meadow: effects of predator interactions and warming. Ecological Monographs 81:313–328.

Appendix B. The results of the three-way ANOVAs and the regression analyses of the accessory experiment.

TABLE B1. The results of the three-way ANOVAs showing the effects of temperature and presence of the large (Philonthus rubripennis) and small (Quedius liangshanensis) predators, and their interactions on the dung loss, the abundance of living coprophagous beetle adults, the abundance of living coprophagous beetle larvae and water content of the accessory experiment in an alpine meadow of the Tibetan Plateau. F value and P value are provided.

Dung age (d)   T L S T × L T × S L × S T × L × S
Dung loss                
6 F 3.705 286.937 0.011 25.811 1.616 18.078 0.862
P 0.072 < 0.001 0.917 < 0.001 0.221 < 0.001 0.366
10 F 1.600 357.670 0.030 1.420 5.590 15.350 6.000
P 0.223 < 0.001 0.589 0.251 0.030 0.001 0.026
15 F 12.380 564.887 1.047 9.786 17.560 1.897 0.816
P 0.003 < 0.001 0.321 0.006 < 0.001 0.187 0.379
20 F 25.530 499.624 1.256 0.033 6.282 81.990 0.043
P < 0.001 < 0.001 0.278 0.857 0.023 < 0.001 0.838
25 F 246.545 465.763 13.928 32.257 0.004 111.573 5.879
P < 0.001 < 0.001 0.001 < 0.001 0.951 < 0.001 0.027
35 F 1.998 893.220 0.392 23.248 14.877 164.449 6.436
P 0.176 < 0.001 0.540 < 0.001 0.001 < 0.001 .021
50 F 21.440 904.422 .658 6.115 4.293 122.626 0.092
P < 0.001 < 0.001 0.429 0.025 0.054 < 0.001 0.765
80 F 67.945 1261.914 12.117 10.756 27.947 131.742 4.549
P < 0.001 < 0.001 0.003 0.005 < 0.001 < 0.001 0.049
Abundance of
living coprophagous
beetle adults 		               
6 F 0.167 204.167 0.167 0.167 1.500 0.167 1.500
P 0.688 < 0.001 0.688 0.688 0.238 0.688 0.238
10 F 2.455 50.939 0.030 0.758 0.273 1.485 0.030
P 0.136 < 0.001 0.864 0.397 0.609 0.241 0.864
15 F 1.049 40.984 0.590 0.000 0.262 7.934 1.049
P 0.321 < 0.001 0.454 1.000 0.616 0.012 0.321
20 F 0.063 36.000 4.000 1.563 0.062 6.250 0.562
P 0.806 < 0.001 0.063 0.229 0.806 0.024 0.464
25 F 24.807 24.807 0.330 1.798 0.587 11.890 0.037
P < 0.001 < 0.001 0.573 0.199 0.455 0.003 0.850
35 F 136.111 40.111 0.111 5.444 0.111 9.000 2.778
P < 0.001 < 0.001 0.743 0.033 0.743 0.008 0.115
50 F 32.000 9.389 0.056 3.556 0.222 1.389 0.889
P < 0.001 0.001 0.828 0.038 0.613 0.016 0.942
Abundance of
living coprophagous
beetle larvae 		               
20 F 1.286 0.143 0.143 3.571 3.571 1.286 1.286
P 0.273 0.710 0.710 0.077 0.077 0.273 0.273
25 F 0.391 0.391 0.391 0.043 0.043 2.130 0.391
P 0.540 0.540 0.540 0.837 0.837 0.164 0.540
35 F 0.500 0.055 0.500 0.055 0.055 2.722 0.055
P 0.490 0.817 0.490 0.817 0.817 0.118 0.817
50 F 1.723 2.574 0.532 1.042 0.191 0.191 0.532
P 0.208 0.128 0.476 0.322 0.667 0.667 0.476
80 F 0.833 1.633 0.033 0.300 0.033 0.300 0.033
P 0.375 0.219 0.857 0.591 0.857 0.591 0.857
Water content                
6 F 0.84 51.53 0.33 10.11 0.85 5.73 0.42
P 0.372 < 0.001 0.571 0.006 0.371 0.029 0.527
10 F 13.89 51.67 0.17 0.06 0.01 8.88 10.05
P 0.002 < 0.001 0.683 0.811 0.913 0.009 0.006
15 F 4.68 63.22 4.54 9.14 0.19 24.24 2.11
P 0.046 < 0.001 0.049 0.008 0.670 < 0.001 0.166
20 F 15.54 0.38 0.53 9.97 2.92 0.55 0.14
P 0.001 0.545 0.475 0.006 0.107 0.469 0.715
25 F 4.19 17.28 0.59 0.99 0.22 1.92 4.71
P 0.057 < 0.001 0.455 0.334 0.646 0.185 0.045
35 F 20.25 21.76 3.22 3.22 2.22 4.47 0.41
P < 0.001 < 0.001 0.092 0.092 0.156 0.051 0.530
50 F 7.357 18.239 1.224 1.482 0.151 2.975 1.249
P 0.015 < 0.001 0.285 0.241 0.702 0.104 0.280
80 F 83.35 43.09 0.16 0.37 1.30 2.65 0.31
P < 0.001 < 0.001 0.692 0.551 0.271 0.123 0.586

 

TABLE B2. The regression analyses showing the effects of the abundance of the coprophagous beetle (Aphodius erraticus) and the abundance of the large predator (Philonthus rubripennis) on dung loss and the effects of the large predator (Philonthus rubripennis) and water content on the abundance of the coprophagous beetle (Aphodius erraticus).

Dung age
(days) 		Dung mass loss
and abundance of
Aphodius erraticus 		Dung mass loss
and abundance of
Philonthus rubripennis 		Abundance of
Philonthus rubripennis
and Aphodius erraticus 		Water content
and abundance of
Aphodius erraticus
3 y = 1.7317x - 5.6941
R2 = 0.467
P < 0.001 		y = -2.1306x + 30.332
R2 = 0.8128
P < 0.001 		y = -0.6944x + 20
R2 = 0.5546
P < 0.001 		y = 0.0226x + 0.323
R2 = 0.6363
P < 0.001
6 y = 2.2528x - 11.544
R2 = 0.794
P < 0.001 		y = -2.4218x + 33.86
R2 = 0.8854
P < 0.001 		y = -0.9722x + 20
R2 = 0.9121
P < 0.001 		y = 0.0135x + 0.5307
R2 = 0.475
P < 0.001
10 y = 1.6751x + 4.5047
R2 = 0.6043
P < 0.001 		y = -3.2961x + 36.623
R2 = 0.7526
P < 0.001 		y = -1.322x + 18.474
R2 = 0.5622
P < 0.001 		y = 0.0136x + 0.5411
R2 = 0.5538
P < 0.001
15 y = 1.2766x + 18.47
R2 = 0.6719
P < 0.001 		y = -2.9344x + 41.511
R2 = 0.5763
P < 0.001 		y = -1.5x + 17.25
R2 = 0.3652
P < 0.001 		y = 0.004x + 0.6841
R2 = 0.0788
P = 0.184
20 y = 1.2899x + 25.533
R2 = 0.319
P = 0.004 		y = -4.6947x + 47.757
R2 = 0.4054
P < 0.001 		y = -2.06 06x + 16.045
R2 = 0.4073
P < 0.001 		y = 0.0103x + 0.6005
R2 = 0.3482
P = 0.002
25 y = 1.1465x + 39.002
R2 = 0.4388
P < 0.001 		y = -6.7552x + 55.831
R2 = 0.5572
P < 0.001 		y = -2.25x + 12.25
R2 = 0.1852
P = 0.036 		y = 0.01x + 0.6953
R2 = 0.5258
P < 0.001
35 y = 1.0301x + 49.138
R2 = 0.3472
P = .002 		y = -9.3311x + 61.146
R2 = 0.7209
P < 0.001 		y = -2.1047x + 7.8901
R2 = 0.1121
P = 0.110 		y = 0.0093x + 0.6531
R2 = 0.3378
P = 0.003
50 y = 1.8029x + 50.356
R2 = 0.4741
P < 0.001 		y = -11.445x + 65.056
R2 = 0.7894
P < 0.001 		y = -2.3636x + 6.3636
R2 = 0.2175
P = 0.029 		y = 0.0267x + 0.56
R2 = 0.7445
P < 0.001
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