14 resultados para "Larger Eukaryotes"

em Universidade dos Açores - Portugal


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Dissertação de Mestrado, Ambiente, Saúde e Segurança, 19 de Julho de 2013, Universidade dos Açores.

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 3 de Maio 2012, Universidade dos Açores.

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World Congress of Malacology, Ponta Delgada, July 22-28, 2013.

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Jornadas "Ciência nos Açores – que futuro?", Ponta Delgada, 7-8 de Junho de 2013.

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10th International Phycological Congress, Orlando, Florida, USA, 4-10 de agosto 2013.

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Dissertação de Mestrado, Psicologia da Educação, 11 de Abril de 2014, Universidade dos Açores.

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 11 de Outubro 2013, Universidade dos Açores.

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Dissertação de Mestrado, Biodiversidade e Ecologia Insular, 29 de Maio de 2013, Universidade dos Açores.

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Studies on the feeding habits of aquatic organisms are a requirement for the management and sustainable use of marine ecosystems. The aim of the present research was to analyze the habits and trophic similarities of decapods, starfish and fish in order to propose trophic relationships between taxa, using Hennigian methods of phylogenetic systematics. This new grouping hypothesis, based on shared and exclusive food items and food types, corresponds to the broad taxonomic groups used in the analysis. Our results indicate that algae, Mollusca, Polychaeta, Crustacea, Echinodermata and Actinopterygii are the most exploited common resources among the species studied. Starfish were differentiated from other organisms for being stenophagic, and were grouped for feeding on bivalve mollusks. A larger group of fish and crustaceans shares algae and mainly crustaceans as food items. A third group united all eight species of Actinopterygii. This largest subgroup of fish is typically carnivorous, feeding on Anthozoa and a great quantity of Crustacea. Synodus foetens has a special position among fishes, due to its unique feeding on nematodes. A Euclidean distance dendrogram obtained in a previous publication grouped S. foetens with starfish. That result was based on a few non-exclusive shared similarities in feeding modes, as well as on shared absences of items, which are not an adequate grouping factor. Starfish are stenophagic, eating bivalves almost exclusively. Synodus foetens and Isopisthus parvipinnis have restricted food items, and are thus intermediary in relation to starfish, decapods, and other fish, which are euryphagous. The trophic cladogram displays details of food items, whether or not shared by all species. The resulting trophic analysis is consistent with known historical relationships.

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Dissertação de Mestrado, Engenharia Zootécnica (Zootecnia), 27 de abril de 2015, Universidade dos Açores.

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Patellid limpets are ecologically important keystone grazers having a long history of overexploitation in the Macaronesian Archipelagos (NE Atlantic islands), where some species, such as Patella aspera, are under serious risk.[1, 2] Patella aspera is a protandric sequential hermaphrodite species with external fertilization, in which individuals start off as males but may undergo a sex reversal with age.[3] Hence, exploitation tends to focus on the larger females in the population as larger limpets (predominantly females) are selectively removed. Despite conservation legislation in Canaries, Madeira and Azores, limpets are under severe pressure and few individuals survive long enough to become females, a phenomenon that severely restricts the effective population size.[4] New conservation actions for the protection and sustainable use of limpets in Macaronesian Archipelagos are urgently needed and should be based on a multidisciplinary framework based on knowledge of the population dynamics and connectivity of this species.

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Dissertação de Mestrado, Psicologia da Educação, especialidade de Contextos Comunitários, 13 de Outubro de 2015, Universidade dos Açores.

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Dissertação de Mestrado, Ciências Económicas e Empresariais, 10 de Dezembro de 2015, Universidade dos Açores.

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8th International Technology, Education and Development Conference, Valencia 10th, 11th and 12th of March, 2014.