Brazilian Journal of Oceanography, Volume: 59, Issue: 4, Pages: 357-364, Published: DEC 2011 Brazilian Journal of Oceanography v.59 n.4 2011 Brazilian Journal of Oceanography Universidade de São Paulo (USP) instacron:USP Brazilian Journal of Oceanography, Vol 59, Iss 4, Pp 357-364 (2011)