which feed on various species of algae ”, the authors detail. Another exotic species, Polycerella emertoni , is extremely small in size, and is closely related to the seasonal bryozoan Amathia verticillata , an organism that often displaces native fauna during the summer but disappears when the water cools. “In general, the Mediterranean is said to be moving towards increasingly tropical conditions. If this process continues, we will have to get used to seeing more and more exotic marine species », warn Manuel Ballesteros and Miquel Pontes. A study on marine biodiversity has identified 73 species of sea slug on the coast of the city of Barcelona, ​​an environment strongly anthropized by the metropolis. In this group of gastropod mollusks,

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the most abundant are sea hares, according to the article Lebanon Phone Number List 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 the Barcelona coast The marine invertebrates traditionally known as

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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 species. In habitats with little human pressure, the

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