Table 1. Treatment conditions during experiments.

Exp.	Dates	Nreplicates	Njar	Nshells	Salinity	Temp.	System pH		Jar pH	pCO2 *	Ωa *	TA	DIC
					(psu)	(°C)	Durafet	Spec	Spec	(µatm)		(µmol/kg)	(µmol/kg)
1	5/10–5/16	3	40	35	31.5	12.12±0.15	8.01±0.02	7.97	–	491	1.7	2239.6	2092.9
				42	31.5	12.13±0.18	7.49±0.01	7.50	–	1576	0.62	2235.3	2236.5
2	5/17–5/23	4	40	23	31.8	12.04±0.07	7.98±0.05	7.95±0.03	7.92	502±34	1.64±0.10	2237.8	2076.3
				33	31.8	12.04±0.06	7.76±0.00	7.79±0.02	7.81	766±40	1.17±0.06	2239.2	2140.2
				23	31.8	12.05±0.07	7.48±0.01	7.46±0.03	–	1725±122	0.58±0.04	2230.5	2246.7
3	6/29–7/5	4	33	46	31.9	12.08±0.08	8.02±0.00	7.97	7.99	462	1.50	2092.1	1940.5
				26	31.9	12.07±0.08	7.47±0.01	7.46	7.46	1614	0.50	2085.6	2080.5
				4	31.9	12.09±0.09	7.19±0.01	7.22	7.21	2815	0.30	2084.5	2147.0
4	7/3–7/9	2	39	13	29.6	12.09±0.09	8.02±0.00	7.98±0.00	7.97	460±3	1.51±0.01	2101.5	1943.6
				14	29.6	12.08±0.07	7.47±0.00	7.47±0.02	7.47	1579±50	0.52±0.02	2097.4	2093.4
				0**	29.6	12.11±0.12	7.19±0.01	7.19±0.05	7.12	3057±342	0.28±0.03	2092.2	2165.3
5	7/6–7/12	3	40	24	29.7	12.12±0.13	8.02±0.00	7.97±0.00	7.96	460±4	1.53±0.01	2114.3	1956.6
				21	29.7	12.09±0.09	7.47±0.00	7.47±0.02	7.46	1585±59	0.53±0.01	2108.1	2100.7
				7	29.7	12.12±0.12	7.18±0.01	7.14±0.02	7.15	3421±174	0.25±0.01	2101.7	2211.1

Exp. stands for experiment, temp. for temperature, spec. for spectrophotometer, TA for total alkalinity, and DIC for dissolved inorganic carbon. N_replicates is the number of replicate jars in each treatment, N_jar is the number of pteropods per jar, and N_shells is the number of shells in a treatment scored for shell condition.

* Ω_a and pCO₂ values calculated from DIC and pH measured via spectrophotometry.

** No pteropods survived this treatment in experiment 4.