Table 2.

Linear mixed model results for respiration rate, ammonia production and assimilation efficiency in P. lividus, after 7, 14, 21 and 40 days of exposure to 8.0, 7.7 and 7.4 pH. Due to some technical inconveniences, data are not available at day 40 for ammonia production and at days 21 and 40 for assimilation. Significant effects are in italics

	Factor		d-7	d-14	d-21	d-40
Respiration rate	pH	p	0.341	0.892	0.000	0.182
	sex	p	0.336	0.005	0.386	0.214
	pH*sex	p	0.914	0.256	0.350	0.268
Ammonia production	pH	p	0.855	0.806	0.799
	sex	p	0.353	0.043	0.354
	pH*sex	p	0.303	0.677	0.001
Assimilation efficiency	pH	p	0.322	0.660
	sex	p	0.689	0.220
	pH*sex	p	0.008	0.593