18This study is the first to investigate bacterial community associated with live medusa Aurelia 19 sp. in the Gulf of Trieste (northern Adriatic Sea) using both culture independent and culture-20 based methods. We have analysed bacterial community composition of different body parts of 21 medusa: exumbrella surface, oral arms ('outer' body parts) and of gastric cavity ('inner' body 22 part) and investigated possible differences in medusa associated bacterial community 23 structure at the time of jellyfish population peak and during senescent phase at the end of 24 bloom, when jellyfish start to decay. Based on 16S rRNA clone libraries and denaturing 25 gradient gel electrophoresis (DGGE) analysis, we demonstrated significant difference 26 between bacterial community associated with Aurelia and the ambient seawater bacterial 27 assemblage. Comparing bacterial community composition between different Aurelia medusa 28 body parts, communities differed significantly, especially the one within the gastral cavity. 29The pronounced difference is dominance of Betaproteobacteria (Burkholderia, Cupriavidus 30 and Achromobacter) in gastral cavity of medusa and Alpha-(Phaeobacter, Ruegeria) and 31Gamma-proteobacteria (Stenotrophomonas, Alteromonas, Pseudoalteromonas and Vibrio) 32 on 'outer' body parts. This suggests that body-part specific bacterial association might have 33 an important functional roles for the host. The results of bacterial isolates showed the 34 dominance of Gammaproeteobacteria, especially Vibrio and Pseudoalteromonas in all body 35 parts. Finally, comparison of medusa associated bacterial community structure, at the time of 36 jellyfish population peak and during senescent phase at the end of bloom showed increased 37 abundance of Gammaproteobacteria, especially Vibrio. Our results suggest members of 38
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