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Variations of antioxidant efficiency and presence of endosymbiotic diatoms in the Antarctic porifera Haliclona dancoi

2004; Elsevier BV; Volume: 58; Issue: 2-5 Linguagem: Inglês

10.1016/j.marenvres.2004.03.055

1879-0291

Francesco Regoli, Marco Nigro, Elena Chierici, Carlo Cerrano, S. Schiapparelli, Cecilia Totti, Giorgio Bavestrello,

Environmental Toxicology and Ecotoxicology

The role of endosymbiotic diatoms as pro-oxidant stressors in porifera has been investigated in the Antarctic sponge Haliclona dancoi in which the presence of diatoms is influenced by marked seasonal variations during the austral summer. Both chlorophaeopigments and frustules were absent in sponge tissues sampled in early November at the beginning of the summer and increased from the mid of December with slightly shifted temporal trends. The efficiency of antioxidant defenses in the sponge showed a marked response to symbionts with clearly enhanced values corresponding to the peak of diatoms.