Table 2.

The results of a GLM to investigate the relationship between stickleback armour (“armour PC”) and trout catch rate, calcium and their interaction, for 12 freshwater lochs on the island of North Uist, Scotland. The model had normal errors and an identity link function. The final model explained 69.4% of the variation in armour PC

Explanatory variable	Wald F	df	P
Trout catch rate (fish angler-1 h−1)	26.00	1, 10	<0.001
Calcium mg L−1	1.68	1, 9	0.23
Trout catch rate × calcium	0.31	1, 8	0.59