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The effects of epiphytes on light harvesting and antioxidant responses in the s...
Costa, Monya; Silva, João; Olivé, Irene; Barrote, Isabel; Alexandre, A.; Albano, Sílvia; Santos, RuiPosidonia oceanica (L.) Delile is a subtidal seagrass whose leaves are commonly colonized by epiphytes. Epiphytes pose physical barriers to light penetration within the leaves, with possible significant impacts on photosynthesis. Furthermore, epiphytes can indirectly be responsible for leaf chlorosis, necrosis and senescence which are known to be related with the increase of oxygen reactive species (ROS) levels...
Responses of zostera marina and cymodocea nodosa to light-limitation stress
Silva, João; Barrote, Isabel; Costa, Monya; Albano, Sílvia; Santos, RuiThe effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2–3 m depth), each dominated by one species. The response of photosynthesis to light was determined with oxygen electrodes. Chlorophylls and carotenoid...
Physiological responses of Zostera marina and Cymodocea nodosa to light-limitat...
Silva, João; Barrote, Isabel; Costa, Monya; Albano, Sílvia; Santos, RuiThe effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2–3 m depth), each dominated by one species. The response of photosynthesis to light was determined with oxygen electrodes. Chlorophylls and carotenoid...
Floral visitors, their frequency, activity rate and Index of Visitation Rate in...
Albano, Sílvia; Salvado, Eva; Borges, Paulo A. V.; Mexia, AntónioCopyright © 2009 Universita degli Studi di Firenze. ; This study was carried out in one of the most important strawberry (Fragaria × ananassa Duch.) producing regions of Portugal, the Ribatejo, and aims to describe the quantitative component of visits by strawberry floral visitors under open field conditions. The main objectives were: (1) to assess the flower-visiting insects of the strawberry crop; (2) to eva...
Pollination effectiveness of different strawberry floral visitors in Ribatejo, ...
Albano, Sílvia; Salvado, Eva; Duarte, Sónia; Mexia, António; Borges, Paulo A. V.Copyright © 2009 Universita degli Studi di Firenze. ; This study was carried out in a strawberry (Fragaria × ananassa Duch.) field located in Ribatejo, Portugal, and aims to describe the qualitative component of the visits for three strawberry floral visitors, attaining the best results in a previous work. The main objectives were: (1) to assess the pollination rate (PR) resulting from a single visit of Apis m...
Tomate para indústria: biodiversidade e infra-estruturas ecológicas
Mexia, António; Amaro, Fernanda; Gonçalves, Catarina; Duarte, Sónia; Costa, Cristina Amaro; Albano, Silvia; Salvado, EvaIn this study, we address the theory behind the ecological functions provided by biodiversity and ecological infra-structures, as well as their role in enhancing the performance of natural enemies, in agrarian ecosystems. This study focuses on the processing tomato agrarian ecosystem. In this crop, the key pest is the tomato fruitworm, which is followed by a complex of natural enemies, essentially parasitoids. ...
Análise comparativa da importância dos vários agentes de polinização na cultura...
Albano, Sílvia; Salvado, Eva; Borges, Paulo A. V.; Mexia, AntónioV Congresso Ibérico de Ciências Hortícolas, Porto, Maio 2005. ; A maioria das cultivares modernas de morangueiro possuem flores hermafroditas auto-férteis cuja polinização está dependente da acção combinada de vários agentes, nomeadamente o vento, a gravidade e os insectos polinizadores. A contribuição relativa de cada um destes agentes de polinização é variável consoante as cultivares envolvidas e o ambiente ...
Avaliação preliminar do efeito da polinização por abelhões na qualidade da prod...
Salvado, Eva; Albano, Sílvia; Borges, Paulo A. V.; Mexia, AntónioV Congresso Ibérico de Ciências Hortícolas, Porto, Maio 2005. ; Neste trabalho apresentam-se os resultados relativos a um estudo da produção de tomate na época de Primavera-Verão, desenvolvido numa estufa na região Oeste de Portugal com o objectivo de avaliar a eficácia dos abelhões, comparando-a com outra técnica de polinização, a vibração mecânica das flores. Para o efeito foi analisada a produção de 3 modal...
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