Topic
Pentaclethra
About: Pentaclethra is a research topic. Over the lifetime, 31 publications have been published within this topic receiving 833 citations.
Papers
TL;DR: It is demonstrated that trees in general are potentially important recruitment foci, but that different types of trees vary in the kind of recruitment that they foster in pastures.
Abstract: Trees in pastures attract seed dispersers, leading to increased seed arrival under their canopies and more rapid regrowth around them The characteristics that make some trees better `recruitment foci' than others, however, are poorly understood In a neotropical pasture, we examined the arrival of seeds to open areas and underneath four genera of trees that varied in canopy architecture and type of fruit produced: Ficus trees had dense canopies and fleshy fruits, Pentaclethra trees had dense canopies and dry fruits, Cecropia trees had sparse canopies and fleshy fruits, and Cordia trees had sparse canopies and dry fruits We found that all trees received more seeds than open pasture, probably because trees provided seed dispersers with better perches, protection from predators, nesting sites, etc Among the tree genera, more seeds arrived under trees that produced fleshy fruits than trees that did not This occured even during periods when trees were not fruiting (ie, non-fruiting Ficus and Cecropia trees received more seeds than Cordia or Pentaclethra trees) Seed dispersers may periodically check Ficus and Cecropia trees for fruits, or they may become familiar with these trees while feeding and thereafter use them for other reasons Height of trees had a slight positive effect on seed arrival, possibly because taller trees offered more protection from predators Canopy architecture and distance to forest edge did not significantly affect seed arrival This study demonstrates that trees in general are potentially important recruitment foci, but that different types of trees vary in the kind of recruitment that they foster in pastures
146 citations
TL;DR: On the basis of its response to intervention during the first seven years of management, the forest appears resilient and productive; trends over time in mortality rates under the most intense silvicultural regime require close attention however.
102 citations
TL;DR: In this paper, the results showed that the seed contained 5.3% moisture, 47.4% fat/oil, 36.2% protein, 1.5% ash and 9.6% carbohydrate, and the mineral content of defatted seed flour was found to be Na (236.2), K (181.3), Ca (104.5), P (101.6) and Fe (34.8) ppm.
Abstract: Flour produced from the seeds of African oil bean (Pentaclethra marcrophylla) was evaluated for proximate chemical composition, some mineral constituents and physicochemical properties of the ether extract. The results showed that the seed contained 5.3% moisture, 47.4% fat/oil, 36.2% protein, 1.5% ash and 9.6% carbohydrate. The mineral content of the defatted seed flour was found to be Na (236.2), K (181.3), Ca (104.5), P (101.6) and Fe (34.8) ppm. The proximate and mineral compositions suggest that the seed, as a che ap source of protein, oil and macro minerals, may find a good use as human food or b e incorporated into animal feed. The oil was found to have a saponification value of 189.85, iodine value 161.95, acid value 7.01, unsaponifiable matter 36, specific gravity 0.890 and a refractive index of 1.465. The high degree of unsaturation makes it suitable for cooking purposes and for use as a drying oil for cosmetics, paints and varnishes.
81 citations
TL;DR: In this paper, Radial dendrometers were installed on 27 trees comprising 12 species, and hourly readings were automatically recorded for 20 and 24 mo, respectively, in a tropical wet forest of eastern-lowland Costa Rica.
Abstract: Stem-growth periodicity of several tree species was investigated in a tropical wet forest of eastern-lowland Costa Rica. The climate of the region is moderately wet and only weakly seasonal. The forest in which the study was conducted is luxuriant, mainly evergreen, and apparently free of recent significant human disturbance. Two sites with differing soil drainage were utilized: a well-drained area and a fresh-water swamp. Radial dendrometers were installed on 27 trees comprising 12 species, and hourly readings were automatically recorded for 20 and 24 mo, respectively. Daily rainfall, air temperature, and relative humidity were monitored; day-length and sun-elevation values were calculated. Five of the eight species studied in the well-drained habitat showed periodic behavior. Their seasonality was mainly annual, but two of four Pentaclethra macroloba had semi- annual rhythms. The periodic trees were well synchronized with one another and with the climatic cycle. All of them exhibited growth cessations that were associated with the drier portion of the year. Each of the two semiannual Pentaclethra underwent an additional interruption during the wet season. All of the trees monitored in the swamp displayed intermittent stem growth. Only one or possibly two trees (both Pentaclethra) had annual periods. The remainder showed cycles that were either longer or shorter than a year. The Pentaclethra were fairly well synchronized with one another and with the drier time of year. Cambial activity of the synchronized trees was inversely related to day length, inso- lation angle, and air temperature at both sites.
71 citations
TL;DR: The observation that four of the five species increased in A(l):A(s) with height is consistent with hypotheses about trade--offs between morphological and anatomical adaptations that favor efficient water flow through variation in the amount of leaf area supported by sapwood and those imposed by the need to respond quickly to light gaps in the canopy.
Abstract: Summary We developed allometric equations to predict whole-tree leaf area (Al), leaf biomass (Ml) and leaf area to sapwood area ratio (Al:As) in five rain forest tree species of Costa Rica: Pentaclethra macroloba (Willd.) Kuntze (Fabaceae/ Mim), Carapa guianensis Aubl. (Meliaceae), Vochysia ferruginea Mart. (Vochysiaceae), Virola koshnii Warb. (Myristicaceae) and Tetragastris panamensis (Engl.) Kuntze (Burseraceae). By destructive analyses (n = 11–14 trees per species), we observed strong nonlinear allometric relationships (r 2 ≥ 0.9) for predicting Al or Ml from stem diameters or As measured at breast height. Linear relationships were less accurate. In general, Al:As at breast height increased linearly with tree height except for Pentaclethra, which showed a negative trend. All species, however, showed increased total Al with height. The observation that four of the five species increased in Al:As with height is consistent with hypotheses about tradeoffs between morphological and anatomical adaptations that favor efficient water flow through variation in the amount of leaf area supported by sapwood and those imposed by the need to respond quickly to light gaps in the canopy.
61 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 1 |
| 2018 | 1 |
| 2017 | 3 |
| 2016 | 1 |
| 2014 | 1 |