Effect of Season and Increased Temperature on Survival, Roe Enhancement, and Reproductive Cycle of the Green Sea Urchin (Strongylocentrotus droebachiensis) Collected from Four Relatively Close Sites in Northern Norway

Table 2

Significance tests and related statistics (degrees of freedom, mean square, F ratio, value) for the ANOVA analysis of the “final GI” and “increase in GI” from the enhancement trials.

Effect	df	Mean square	F ratio
Final GI
Trial (1, 2, 3)	2	66.43	28.63	<0.001
Temperature (Amb, Amb + 3)	1	9.52	4.10	0.045
Trial × temperature	2	1.61	0.69	0.503
Site	3	19.39	8.36	<0.001
Trial × site	6	2.30	0.99	0.435
Temperature × site	3	3.68	1.59	0.198
Trial × temperature × site	6	1.96	0.85	0.320
Error	96	2.32	—	—
Increase in GI
Trial (1, 2, 3)	2	91.40	39.39	<0.001
Temperature (Amb, Amb + 3)	1	11.12	4.79	0.030
Trial × temperature	2	2.74	1.18	0.310
Site	3	73.61	31.72	<0.001
Trial × site	6	34.39	14.82	<0.001
Temperature × site	3	3.82	1.65	0.183
Trial × temperature × site	6	3.08	1.33	0.251
Error	96	2.32	—	—

indicates significant differences.