Changes in Abiotic Drivers of Green Sea Urchin Demographics following the Loss of a Keystone Predator

Table 4

SIMPER analyses comparing the relative contribution of each of the five binned size classes to the observed differences among time periods.

Predecline vs. end of decline
Average
Size	Predecline	End of decline	Av.Diss	Diss/SD	Contrib%	Cum.%
Category	Av.Abund	Av.Abund
Recruit	87.43	80.38	26.14	1.21	45.69	45.69
Small	43.13	70.15	18.72	1.17	32.71	78.41
Medium	12.34	34.51	10.84	0.89	18.95	97.35
Large	1.87	1.89	1.13	0.43	1.97	99.32
Extralarge	0.94	0.2	0.39	0.18	0.68	100
Predecline vs. postdecline 1
Average
Species	Predecline	Postdecline 1	Av.Diss	Diss/SD	Contrib%	Cum.%
	Av.Abund	Av.Abund
Recruit	87.43	89.92	26.36	1.28	45.09	45.09
Small	43.13	44.59	14.16	1.1	24.21	69.3
Medium	12.34	31.05	10.28	0.84	17.59	86.89
Large	1.87	14.44	5.15	0.62	8.81	95.7
Extralarge	0.94	6.4	2.51	0.39	4.3	100
End of decline vs. postdecline 1
Average
Species	End of decline	Postdecline 1	Av.Diss	Diss/SD	Contrib%	Cum.%
	Av.Abund	Av.Abund
Recruit	80.38	89.92	24.57	1.17	42.03	42.03
Small	70.15	44.59	15.99	1.16	27.36	69.39
Medium	34.51	31.05	11.24	0.93	19.22	88.61
Large	1.89	14.44	4.54	0.6	7.77	96.39
Extralarge	0.2	6.4	2.11	0.36	3.61	100
Predecline vs. postdecline 2
Average
Species	Predecline	Postdecline 2
	Av.Abund	Av.Abund	Av.Diss	Diss/SD	Contrib%	Cum.%
Recruit	87.43	97.13	26.37	1.3	43.66	43.66
Small	43.13	55.84	15.17	1.1	25.12	68.78
Medium	12.34	27.65	8.71	0.81	14.42	83.2
Large	1.87	16.16	5.91	0.64	9.79	93
Extralarge	0.94	10.57	4.23	0.49	7	100
End of decline vs. postdecline 2
Average
Species	End of decline	Postdecline 2	Av.Diss	Diss/SD	Contrib%	Cum.%
	Av.Abund	Av.Abund
Recruit	80.38	97.13	24.28	1.19	40.89	40.89
Small	70.15	55.84	16.08	1.12	27.09	67.97
Medium	34.51	27.65	10.14	0.89	17.08	85.06
Large	1.89	16.16	5.22	0.61	8.78	93.84
Extralarge	0.2	10.57	3.66	0.46	6.16	100
Postdecline 1 vs. postdecline 2
Average
Species	Postdecline 1	Postdecline 2	Av.Diss	Diss/SD	Contrib%	Cum.%
	Av.Abund	Av.Abund
Recruit	89.92	97.13	24.87	1.22	42.79	42.79
Small	44.59	55.84	13.48	1.09	23.19	65.98
Medium	31.05	27.65	9.45	0.88	16.25	82.23
Large	14.44	16.16	6.12	0.8	10.54	92.77
Extralarge	6.4	10.57	4.2	0.57	7.23	100