• Publications
  • Influence
The canopy effect, carbon isotope ratios and foodwebs in Amazonia
Abstract In forests, the canopy effect produces 13 C-depleted plants and a gradient of leaf δ 13 C values from ground to canopy; the most negative values are near the ground. Explanations for thisExpand
Conversion and recovery of Puerto Rican mangroves : 200 years of change
Human activities have dramatically reduced the world’s area of mangroves just as the ecological services they provide are becoming widely recognized. Improving the conservation tools available toExpand
Nutrient dynamics within amazonian forests
Results emphasize the differences in limiting nutrients in amazonian forest ecosystems on contrasting soil types: Tierra Firme forests are particularly limited by Ca and Mg, while Caatinga and Bana forests are limited mainly by N availability. Expand
Water and nutrient relations of woody perennials from tropical dry forests
Proline was found to be a reliable indicator of water stress in these woody species, the amount of proline measured in leaf sap being logarithmically correlated with the corresponding π value. Expand
Photosynthesis and sup 13 C/ sup 12 C ratios in Amazonian rain forests
Measurements are reported of {sup 13}C/{sup 12}C ratios for air CO{sub 2} at different heights in two Amazonian rain forests. CO{sub 2} emitted from the forest floor is severely depleted in {sup 13}CExpand
II. Fine root growth, nutrient availability and leaf litter decomposition
Summary. Relationships between fine root growth, rates of litter decomposition and nutrient release were analysed in a mixed forest on Tierra Firme, a Tall Amazon Caatinga and a Low Bana onExpand
Osmolality and δ13C of Leaf Tissues of Mangrove Species from Environments of Contrasting Rainfall and Salinity
It appears that nutrient deficiency is not a main factor determining variations in community structure in Neotropical species of the genera Rhizophora, LagunculariaandAvicenniagrow in environments of variable salinity and flooding stress. Expand
Sclerophylly and oligotrophic environments : relationships between leaf structure, mineral nutrient content, and drought resistance in tropical rain forests of the upper Rio Negro region
This paper uses quantitative methods to characterize leaf anatomy, nutrient content and water relations, and discusses some eco-physiological properties of sclerophyllous leaves in wet climates with nutrient poor soils. Expand
Nutrient dynamics within amazonian forest ecosystems
A comparative analysis on the rate of fine litterfall and its associated nutrient fluxes was carried out in a mixed forest on Tierra Firme, a tall Amazon Caatinga and a Bana on podsolized sands, indicating common regulating factors in the three forests. Expand
Profiles of CO2 concentration and δ13C values in tropical rain forests of the upper Rio Negro basin, Venezuela
Concentration of CO2 above and below the soil surface and 613C values of plant tissues, soil litter and organic matter were measured in a caatinga forest of the upper Rio Negro basin in southernExpand