(Table 1) CTD data, mean spring and annual temperatures and salinities from World Ocean Atlas (WOA, 2001), and Mg/Ca data, sampled with a multinet at station 74 and 81 from POSEIDON cruise 334

* = G. bulloides only calcifies in the uppermost part of the water column. Hence, specimens from deeper tows are expected to be similar to the shallow ones. This is also indicated by most samples except for this one. Its value is more than 2 standard deviations away from the average G. bulloides Mg/Ca ratios for this tow location. Hence, although no indications are present that this sample was contaminated, it was excluded from further consideration.