environment strongly anthropized by the metropolis. In this group of gastropod mollusks, the most abundant are sea hares, according to the article coordinated by Professor Manuel Ballesteros, from the Faculty of Biology and the Biodiversity Research Institute (IRBio) of the University of Barcelona. The work is one of the few ecological studies on these species in Mediterranean port cities and is published in the Butlletí de la Institució Catalana d’Història Natural (BICHN, 2020), a subsidiary of the Institute of Catalan Studies (IEC). The experts Àlex Parera, from the Faculty of Biology of the UB; Miquel Pontes, from the VIMAR study group, and Xavier Salvador, from the Catalan Opisthobranch Research Group (GROC). The urban catalog of opisthobranchs on

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the Barcelona coast The marine invertebrates Kenya Phone Number List traditionally known as opisthobranchs – nowadays, heterobranchs – are a large group of gastropod mollusks – nudibranchs, sea hares, sacoglossi, sea butterflies, etc. – with a polyphyletic origin. They abound in marine areas where it is easy to find their food – often a unique species of animal or algae – and tend to show high biodiversity in marine ecosystems with varied habitats (rocks or sandy bottoms, for example). The degradation or destruction of marine habitats is a global threat to heterobranch biodiversity. In intensely anthropized environments, factors such as human pressure on the natural habitat or the eutrophication of the environment by urban waste tend to favor the excessive development of few

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species. In habitats with little human pressure, the 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

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