semi-closed coastal areas, such as the Forum”, details Miquel Pontes. “However,” he continues, “it is surprising to find so many species in an environment as anthropized as the beaches, the breakwaters and the interior of the port and the marinas of Barcelona, ​​on a coastline of about eleven kilometers, from the Besòs to the Llobregat ». “Now,” says the researcher, “it should be confirmed whether the surprise is the result of the lack of prior knowledge about the presence of these gastropods or even if these results respond to an efficient colonization process of the substrates that have been artificially created in the Barcelona’s coastline in recent decades ». According to experts, the configuration of species found is very different from that found in other

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better-preserved places, such as the Medes Islands, where the scientific team has identified up to 108 different species since 2010. “While in Barcelona we see more specimens that eat algae, in the Medes we see Luxembourg Phone Number List above all species that eat sponges, cnidarians and bryozoans, and whose presence in Barcelona is merely anecdotal”, detail Ballesteros and Pontes, co-authors together with Enric Madrenas of the book Els nudibranquis del mar català (Brau Edicions, 2019), the first field guide dedicated to the more than 150 species of nudibranchs identified so far in the marine ecosystems of Catalonia. An increasingly tropical Mediterranean Climate change is also favoring the presence of exotic marine species in the Mediterranean from the Red Sea –

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through the Suez Canal – or from the Atlantic after crossing the Strait of Gibraltar. In this scenario, the work also identifies the presence of non- native species – Bursatella leachii and Polycerella emertoni – in the urban marine ecosystem of Barcelona, ​​but it seems that their ecological impact would be practically nil. «The sea hare Bursatella leachii , with a remarkable size and high reproductive capacity, could become a problem if there is a lot of food available. However, at the moment this is not the case, so it is a more curious than problematic finding. It is a species that feeds on diatoms and therefore does not compete with native species of sea hares such as Aplysia punctata and Aplysia depilans , which feed on various species of algae ”, the authors

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