Table 1. PERMANOVAs to test for effects of HW simulations on absolute assemblage structure.

PERMANOVAs to test for differences in multivariate assemblage structure (after Phase 3) between HW Timings and HW Magnitudes based on absolute abundance data. Permutations (4,999 under a reduced model) were based on Bray-Curtis similarity matrices constructed from square-root transformed abundance data. Main tests were conducted on both the 1-week (A) and 2-week (B) HW duration experiments separately. Significant P values (at P < 0.05) are shown in bold. Significant Magnitude/Magnitude × Timing interaction effects were investigated further with post-hoc pairwise comparisons.

Source	df	SS	F	P
(A)
Magnitude	3	1,226	1.88	0.010
Timing	2	2,7267	62.87	0.001
Ma × Ti	6	1,313	1.01	0.485
Residual	52	11,276
Total	63	41,467
Post-hoc tests for Magnitude: FC ≠ C & T2, C ≠ T2
(B)
Magnitude	3	2,420	4.25	0.001
Timing	2	25,517	67.20	0.001
Ma × Ti	6	2,101	1.85	0.001
Residual	52	9,872
Total	63	40,312
Post-hoc tests for Ma × Ti:
Timing 1: FC ≠ C & T1 & T2
Timing 2: FC ≠ C & T1 & T2, C ≠ T1 & T2
Timing 3: FC ≠ C & T1 & T2