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 1

The percentage mortality recorded in sea urchins held in each of the trials (1–3) and from each of the sites (Tunnel, Harbour, Kårvika, and Ytre Kårvika) and from the two temperature treatments (ambient and ambient + 3.0°C) and the combined percent mortality for each site.

Trial	Population	Ambient	Ambient + 3°C	Total
1	Tunnel	17.5 (7)	2.5 (1)	20.0 (8)
	Harbour	2.5 (1)	10.0 (4)	12.5 (5)
	Kårvika	0 (0)	5.0 (2)	5.0 (2)
	Ytre Kårvika	0 (0)	2.5 (1)	2.5 (1)
2	Tunnel	0 (0)	2.5 (1)	2.5 (1)
	Harbour	0 (0)	0 (0)	0 (0)
	Kårvika	0 (0)	0 (0)	0 (0)
	Ytre Kårvika	0 (0)	0 (0)	0 (0)
3	Tunnel	2.5 (1)	7.5 (3)	10.0 (4)
	Harbour	5 (2)	5.0 (2)	10.0 (4)
	Kårvika	2.5 (1)	15.0 (6)	17.5 (7)
	Ytre Kårvika	2.5 (1)	5.0 (2)	7.5 (3)