The diversity of relationships between Antarctic sponges and diatoms: the case of Mycale acerata (Porifera, Demospongiae) - CERRANO, CARLO; BAVESTRELLO, GIORGIO; CALCINAI B.; CUCCHIARI E.; DI CAMILLO C.; TOTTI C. (Springer Verlag Germany:Tiergartenstrasse 17, D 69121 Heidelberg Germany:011 49 6221 3450, EMAIL: g.braun@springer.de, INTERNET: http://www.springer.de, Fax: 011 49 6221 345229, 2004)