natural balance that is achieved translates into higher biodiversity and the stability of biological communities over time. In the case of the Barcelona coastline, «the marine habitat has been transformed to a great extent by the action of man, the construction of walls, concrete dikes, reefs, ports and sports marinas, etc., which give new opportunities for survival to animal species that otherwise could not survive in the original place (nor their predators) ”, explains Manuel Ballesteros, from the Department of Evolutionary Biology, Ecology and Environmental Sciences of the UB. “Human pressure,” he continues, “also negatively affects many fragile species (gorgonians, bryozoans, sponges) that are the preferred food source for many

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organisms, and this directly conditions their presence in the marine Lithuania Phone Number List environment. In a way, it could be said that these species of sea slug have been selected for our actions on the marine environment. From sandy seabeds to port constructions In general, species of small size and nocturnal habitat have been found, which are associated with the fauna of the habitats in crevices of the rocks and the reefs of the Barcelona coastline. The most abundant are the anaspids – the well-known sea hares, which feed on algae – and the cephalaspids, which usually feed on organisms that live in mud or sand. In the case of nudibranchs, which are mostly carnivores, their presence on the Barcelona coast is scarce and the findings have been occasional. Many species of

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heterobranchs can be found on colonies of hydrozoans, gorgonians or marine sponges, that is, in areas where there is a certain amount of phytoplankton and zooplankton to feed on. In some cases, an excess of organic matter in the marine environment causes an occasional excessive proliferation – upwelling – of algae or bryozoans that damages the conservation of the biodiversity of these mollusks. In contrast, anaspids or sacoglossal populations benefit from the abundant growth of algae at shallow depths, conditions that occur in all port structures (dikes, reefs, etc.). Experts have identified 73 different species on the urban coastline, “although the ecological status of urban waters is not very good, especially at the mouth of the Besòs and in

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