Samples were collected from March 2006 to March 2007, from
both sampling stations, at two random times within each month
except in August when only one sample was taken. Samples were
always collected between 08:00 h and 11:00 h on the same day for
LiB and LaB. Integrated samples, consisting of equal part from 1, 2,
3, 4 and 5 m depths, were collected with a metal-free 10-l Niskin
sampling bottle in 10-l high-density polyethylene acid-washed
bottles