5 documents found, page 1 of 1
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Maximum carboxylation velocity of rubisco and maximum rate of electron transpor...
Mendes, Keila Rêgo; Marenco, R. A.; Nascimento, Helena Cristina SantosLight availability is one of the main factors that limits photosynthetic rates in saplings in the forest understory. The aims of this study were to determine how photosynthetic parameters (maximum carboxylation velocity of Rubisco – Vc-max and maximum rate of electron transport – Jmax) respond to irradiance, temperature and diurnal variations in the physical environment. Gas exchange data were collected between...
Acclimation of manwood seedlings to full sunlight
Magalhães, Nilvanda dos Santos; Marenco, R. A.; Mendes, Keila RêgoThe aim of this work was to determine the physiological changes that occur in manwood (Minquartia guianensis) during the acclimation process to high irradiance, and also to determine the acclimation strategy of this species. Plants kept in low light were transferred to high irradiance for 290 days. During this period the ratio between variable fluorescence and maximum fluorescence (Fv/Fm) was measured in leaves...
Photosynthetic traits of canopy leaves of Dinizia excelsa (Fabaceae)
Mendes, Keila Rêgo; M, Bento; Marenco, Ricardo Antonio
Growth and photosynthetic use efficiency of nitrogen and phosphorus in saplings...
Mendes, Keila Rêgo; Marenco, R. A.; Magalhães, Nilvanda dos SantosIn the Amazon Rainforest, photosynthesis and tree growth may be limited by the availability of nutrient. Thus, the objectives of this study were to determine the effect of leaf N and P content on photosynthesis, and to assess plant growth in response to understory light in ten tree species in Central Amazonia. Data were collected in January 2008. The photosynthetic capacity (Apot) of leaves positively increased...