scholarly journals Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)

2005 ◽  
Vol 62 (6) ◽  
pp. 553-564 ◽  
Author(s):  
Jean Christophe Roggy ◽  
Eric Nicolini ◽  
Pascal Imbert ◽  
Yves Caraglio ◽  
Alexandre Bosc ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Leaf Traits ◽  
Forest Tree ◽  
Tree Structure ◽  
Dicorynia Guianensis

A case of gender equality: absence of sex-related costs in a dioecious tropical forest tree species

Plant Ecology ◽  
2021 ◽  
Author(s):  
Valéria Forni Martins ◽  
Rafaela Letícia Brito Bispo ◽  
Priscilla de Paula Loiola
Keyword(s):  
Tropical Forest ◽  
Gender Equality ◽  
Tree Species ◽  
Forest Tree ◽  
Forest Tree Species

scholarly journals Linking hydraulic traits to tropical forest function in a size-structured and trait-driven model (TFS v.1-Hydro)

2016 ◽  
Vol 9 (11) ◽  
pp. 4227-4255 ◽  
Author(s):  
Bradley O. Christoffersen ◽  
Manuel Gloor ◽  
Sophie Fauset ◽  
Nikolaos M. Fyllas ◽  
David R. Galbraith ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Water Potential ◽  
Plant Traits ◽  
Coupled Model ◽  
Leaf Traits ◽  
Tree Size ◽  
Leaf Mass Per Area ◽  
Stem Water Potential ◽  
Plant Hydraulics ◽  
Individual Trees

Abstract. Forest ecosystem models based on heuristic water stress functions poorly predict tropical forest response to drought partly because they do not capture the diversity of hydraulic traits (including variation in tree size) observed in tropical forests. We developed a continuous porous media approach to modeling plant hydraulics in which all parameters of the constitutive equations are biologically interpretable and measurable plant hydraulic traits (e.g., turgor loss point πtlp, bulk elastic modulus ε, hydraulic capacitance Cft, xylem hydraulic conductivity ks,max, water potential at 50 % loss of conductivity for both xylem (P50,x) and stomata (P50,gs), and the leaf : sapwood area ratio Al : As). We embedded this plant hydraulics model within a trait forest simulator (TFS) that models light environments of individual trees and their upper boundary conditions (transpiration), as well as providing a means for parameterizing variation in hydraulic traits among individuals. We synthesized literature and existing databases to parameterize all hydraulic traits as a function of stem and leaf traits, including wood density (WD), leaf mass per area (LMA), and photosynthetic capacity (Amax), and evaluated the coupled model (called TFS v.1-Hydro) predictions, against observed diurnal and seasonal variability in stem and leaf water potential as well as stand-scaled sap flux. Our hydraulic trait synthesis revealed coordination among leaf and xylem hydraulic traits and statistically significant relationships of most hydraulic traits with more easily measured plant traits. Using the most informative empirical trait–trait relationships derived from this synthesis, TFS v.1-Hydro successfully captured individual variation in leaf and stem water potential due to increasing tree size and light environment, with model representation of hydraulic architecture and plant traits exerting primary and secondary controls, respectively, on the fidelity of model predictions. The plant hydraulics model made substantial improvements to simulations of total ecosystem transpiration. Remaining uncertainties and limitations of the trait paradigm for plant hydraulics modeling are highlighted.

scholarly journals Stability of tropical forest tree carbon‐water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

2021 ◽  
Author(s):  
Alexandria L. Pivovaroff ◽  
Nate G. McDowell ◽  
Tayana Barrozo Rodrigues ◽  
Tim Brodribb ◽  
Lucas A. Cernusak ◽  
...  
Keyword(s):  
Tropical Forest ◽  
Water Uptake ◽  
Water Relations ◽  
Forest Tree ◽  
Effective Water

scholarly journals Alterations in the lipid and soluble sugar content of melanoxylon brauna seeds during natural and accelerated ageing

2010 ◽  
Vol 32 (3) ◽  
pp. 152-162 ◽  
Author(s):  
Viviana Borges Corte ◽  
Eduardo Euclydes de Lima e Borges ◽  
José Francisco de Carvalho Gonçalves ◽  
Mirian Sousa Silva
Keyword(s):  
Fatty Acids ◽  
Tropical Forest ◽  
Sugar Content ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Forest Tree ◽  
Accelerated Ageing ◽  
Natural Ageing ◽  
Metabolic Reactions ◽  
Tree Seeds

The decay of seeds is irreversible and at best can only be delayed by applying techniques that reduce the velocity of the metabolic reactions involved. There is little information on the biochemistry of tropical forest tree seeds related to their storability. It was investigated the influence of the composition of lipids and soluble sugars of two storage compartments, the cotyledons and the embryonic axis, of Melanoxylon brauna Schot. (Leguminosae- Caesalpinioideae), a hardwood known as black brauna, seeds stored at 20 ºC for 0, 3, 6, 9 and 12 months (natural ageing) and for 0, 24, 48, 72 and 96 hours at 40 ºC (accelerated ageing). The levels of fatty acids and monosaccharides varied differentially in each of the embryo storage compartments. Changes in oligosaccharide levels were similar for both types of ageing, diminishing in both compartments. Ageing can be attributed to the significant decrease of oligosaccharides and the increase of glucose in both types of ageing and both embryo compartments.

The role of great apes in seed dispersal of the tropical forest tree species Dacryodes normandii (Burseraceae) in Gabon

2015 ◽  
Vol 31 (5) ◽  
pp. 395-402 ◽  
Author(s):  
Barbara Haurez ◽  
Kasso Daïnou ◽  
Nikki Tagg ◽  
Charles-Albert Petre ◽  
Jean-Louis Doucet
Keyword(s):  
Seed Dispersal ◽  
Tropical Forest ◽  
Tree Species ◽  
Central Africa ◽  
Great Apes ◽  
Forest Tree ◽  
Sampling Effort ◽  
Predator Species ◽  
High Germination ◽  
Visit Duration

Abstract:The identification of seed dispersers and predators is essential to understand the effect of anthropogenic disturbances, and the associated defaunation process, on tropical forest dynamics in Central Africa. In this study, the animals involved in seed predation and dispersal of Dacryodes normandii (Burseraceae), an endozoochorously dispersed tree species endemic to Gabonese forests, were identified in a site in south-east Gabon using two complementary methods: direct observation and camera-trap monitoring of fruit piles. The combined sampling effort (172 h of direct observations and 796 d of camera trapping) led to the identification of six disperser and eight predator species of D. normandii seeds. With high frequency of consumption (88% and 57% of their visits, respectively) and long visit duration (83 and 23 min, respectively), the western lowland gorilla and central chimpanzee were identified as the main dispersers of this species. Seeds passed through the gorilla gut exhibited high germination success (68%). Rodents were identified as predators of D. normandii seeds, potentially displaying rare secondary dispersal through scatter-hoarding. The results of this study highlight the importance of great apes in the seed dispersal of this tree species.

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