Concentrations of fecal bacteria, somatic and F-specific coliphages, and phages infecting Bacteroidesfragilis in naturally occurring black mussels (Mytilus edulis) were determined. Mussels were collected over a 7-month period at four sampling sites with different levels of fecal pollution. Concentrations of both fecal bacteria and bacteriophages in mussel meat paralleled the concentration of fecal bacteria in the overlying waters. Mussels bioaccumulated efficiently, although with different efficiencies, all of the microorganisms studied. Ratios comparing the levels of microorganisms in mussels were determined. These ratios changed in mussels collected at the different sites. They suggest that bacteriophages infecting B. fragilis and somatic coliphages have the

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Although it is true that some pronominalization phenomena are restricted by grammatical or semantic factors, others are better accounted for on informational grounds. Pronominalization is triggered not only by material which is omitted but also by material which is dislocated; therefore, the informational status of pronominalizable strings should also be taken into account, since thematic material must always occupy a dislocated position in Catalan, and dislocation may require clitic binding. Furthermore, as in Catalan sentence structure is intimately associated with prosody (with primary accent marking sentence boundary), considering the relationship between structure and prosody is vital for a unified account on pronominalization, since by doing so, some grammatical phenomena ruled out by some constraints posited in the literature will be accounted for.