Polarnet Technical Report SCIENTIFIC AND TECHNICAL REPORT SERIES ISSN 1592-5064 PUBLISHED BY THE POLARNET COORDINATING UNIT Proceedings of the Fifth PNRA Meeting on Antarctic Biology 29-30 April 2004, Messina CNR INSTITUTE OF ATMOSPHERIC POLLUTION PTR-1/2005 PTR-1/2005 Edited by P. Luporini & M. Morbidoni National Program of Antarctic Research