Abstract
In 2021 we published a six-year study (2015–2020) of the occurrence of the Mediterranean Storm-petrel Hydrobates pelagicus spp. melitensis around a Mediterranean Bluefin Tuna Thun- nus thynnus fish-farm, where high concentrations took place during spring and summer. Great abundances of storm-petrels were recorded in 2020, with more than 100 individuals registered throughout April–August, whereas in previous years only a few individuals had been detected in June–July. These figures suggest either an increasing trend of storm-petrel occurrence in the area (i.e. by learning) or an exceptional episode, probably related to storm Gloria in January 2020. Here, we present the results of censuses undertaken in 2021–2022 whose numbers were lower than those registered in 2020 in May–July. This supports the idea that the events occurring in southern Catalonia after storm Gloria created the ‘perfect storm’ for storm-petrels in this area.
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