A new natural spiro heterocyclic compound and the cytotoxic activity of the secondary metabolites from Juniperus brevifolia leaves

Copyright © 2010 Elsevier B.V. All rights reserved.

Effects of density versus size on grazing by a key exploited herbivore

Fishing decreases the biomass of target species via reduction in the numbers and/or size of individuals. In natural systems, the strength of biological interactions, including predator-prey dynamics, are often density or size-dependent. Hence, changes in the numbers or size of key taxa may be expected to influence biological interactions but their effects do not need to be identical. Here we compare the effects of biomass reduction in populations of the exploited limpet Patella candei. Biomass removal was experimentally achieved by either removing individuals (density reduction) or by replacing large by small individuals (size reduction), while controlling for total limpet biomass in a laboratory-based experiment. At the experiment’s termination, biomass reduction led to proportional changes in area grazed. However, there was no difference whether this was achieved via changes in density or in size. Furthermore, no discernible effects of treatments were evident on different components of the algal assemblage. A field survey also revealed that P. candei biomass explained a greater proportion in variation in the area free of algae than density alone. Our results suggest that loss of biomass in populations of P. candei has quantitatively and qualitatively similar effects on algal cover regardless of whether it is caused by an equivalent (biomass) reduction in the numbers or size of individuals.

Floresta natural dos Açores

O efeito da insularidade reflecte-se no número limitado de espécies arbóreas naturais dos Açores. As mais comuns são a Morella faya (Faia-da-terra), Picconia azorica (Pau-branco), Laurus azorica (Louro), Juniperus brevifolia (Cedro-do-mato), Ilex perado subsp. azorica (Azevinho), Erica azorica (Urze) e Frangula azorica (Sanguinho). Pelo contrário, Prunus azorica (Ginjeira-brava) é actualmente muito rara e Taxus bacatta (Teixo) encontra-se à beira da extinção. Dependendo das condições ambientais, particularmente de temperatura, pluviosidade e exposição ao vento, encontramos diferentes espécies a dominar a copa da floresta. […].

A formação dos educadores de infância na área das ciências: implicações para a supervisão

Dissertação de Mestrado, Supervisão Pedagógica (Educação de Infância), 23 de Abril de 2013, Universidade dos Açores.

Lethal and sublethal effects of essential oils from Pittosporum undulatum and Hedychium gardnerianum on the egg parasitoid Trichogramma cordubensis (Hymenoptera: Trichogrammatidae

Dissertação de Mestrado, Biotecnologia em Controlo Biológico, 6 de Junho de 2013, Universidade dos Açores.

Species composition of arbuscular mycorrhizal fungi differ in semi-natural and intensively managed pastures in an isolated oceanic island (Terceira, Azores)

Copyright © Springer Science+Business Media Dordrecht 2014.

A survey about experiments on notions of time in children k-1 and k-2

In this paper we explore the importance of analyzing the exercises that the manuals have in Mathematics study, because the difficulty of identifying some errors on them can interfere with the capabilities of children. We work with some exercises related to the theme of temporal notions, based on a survey of textbooks from the 1st and 2nd grade (K-1 and K-2). Our concern is to alert about the importance of reflecting on the content of the books, in order to promote a teaching-learning process tailored to the needs of children. The activities present in the manuals should allow children to develop their logical- mathematical reasoning, for later be able to understand and apply Mathematics. To this end, we present some reflection about the exercises of manuals, and we give our opinion about what is the correct and incorrect. Also, some activities are suggested, among which were implemented with children of the 2nd grade, K- 2, along the experiments that support our work.

Plantas vasculares invasoras no Parque Natural da Ilha Terceira : caracterização e monitorização do controlo de Pittosporum undulatum

Dissertação de Mestrado, Engenharia do Ambiente, 9 de Outubro de 2015, Universidade dos Açores.

Effects of natural mortality on the yield per recruit models

Dissertação de Mestrado, Estudos Integrados dos Oceanos, 22 de Janeiro de 2016, Universidade dos Açores.