The annual presence of the gannet (Sula bassana) in the central Thyrrenian Sea

BERNONI M., CARERE C., GUSTIN M.

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Abstract:

Observations for a total of 249 hours were made on the Thyrrenian coast by the mouths of Tevere river from December 1983 to Aprii 1985. The regular presence of the Gannet was recorded and confirmed both in wintering and migratory periods; the presence of mainly adult individuals in these waters suggests that immatures migrate tow.ards eastern seas. On the whole, a distinct prevalence of single individuals (1.59 ind./obs.) was noticed even during migratory periods.