Topic
Lecythis
About: Lecythis is a research topic. Over the lifetime, 39 publications have been published within this topic receiving 779 citations.
Papers
1 Jan 1985
TL;DR: In this paper, the phenology of flowering and fruiting of trees was studied from June 6, 1980 to the end of March 1982 in the lowland rain forest of Piste Saint Elie, French Guiana.
Abstract: The phenology of flowering and fruiting of trees was studied from June
1980 to the end of March 1982 in the lowland rain forest of Piste Saint Elie,
French Guiana. All flowering and fruiting trees over 2 cm DBH overhanging a
trail 1 000 to 1 500 m long and 1 m wide were noted every second week, and
all flowers and fruits which fell on the trail were collected and weighed. The
following results were obtained :
Fertility was always low, less than 50 % of the trees over 45 cm DBH
bearing fruit during the two yearly cycles. Fertility also varied from one year
to the next, being higher during the second yearly cycle. However, some trees
which flowered normally never bore fruit.
Most tree species (from 76 to 80 %, depending on the year) flowered
during the « dry » season and bore fruit during the rainy season (86 to 88 %).
The seeds of most of the species (56 %) germinated in less than one month in
experimental conditions, and 22,2 % in more than 4 months.
Seasonality in reproduction occured in all species of dicotyle donous trees,
whatever their size or age (from 2 to > 60 cm DBH). It was far less marked
in understorey trees, epiphytes and woody lianas. Seasonality in fruiting was
particularly marked among species bearing fleshy fruits disseminated by animals,
although some were produced at any time of the year. Seasonality was also marked among wind-dispersed and autochorous tree species. Among trees
bearing fleshy fruits, those with the larger seeds were much more seasonal than
those with smaller seeds. Finally, the species which were moderately abundant
on the sampling transect were more seasonal than both the scarcer and the most
abundant ones. Mast fruiting was observed in 8 spe cies of Eschweilera and
Lecythis (Lecythidaceae). In the rain forest studied, the fruiting peak mostly
results, at the species level, from the adjustment of the maturation period to
the flowering time.
Biotic factors undoubtedly play an important role in determining fruiting
peaks at the community ievel
127 citations
TL;DR: Light environment, leaf physiological characteristics, and growth were compared for forest-grown saplings of three species of tropical trees with known life histories, and highest average rates were found for Simarouba amara, a fast-growing, light-demanding species.
Abstract: Light environment, leaf physiological characteristics, and growth were compared for forest-grown saplings of three species of tropical trees with known life histories. Light environment was assessed both by hemispherical canopy photography and a quantitative visual index of crown illumination. Leaf gas exchange characteristics were measured by infrared gas analysis. The species tested included Lecythis ampla, a species tolerant of understorey conditions, Pithecellobium elegans, a species found in relatively bright sites, and Simarouba amara, a fast-growing, light-demanding species.Annual height and diameter growth did not significantly differ between the three species, but highest average rates were found for Simarouba. Likewise, saplings of the three species were found in similar low light environments although Simarouba saplings were found in slightly brighter sites and Lecythis saplings were found in the lowest light environments. Despite similar light regimes, the species differed markedly in leaf area and gas exchange. Leaf areas of Lecythis saplings were five and ten-fold greater than Simarouba and Pithecellobium saplings, respectively. Light-saturated leaf photosynthesis and leaf dark respiration rates of Lecythis were about half those of Simarouba; rates of Pithecellobium were intermediate. Lecythis had the highest leaf photosynthesis at understorey diffuse light levels. Measures of annual growth were positively correlated with estimates of both direct and diffuse light with the strongest correlations between sapling performance and diffuse light.
51 citations
TL;DR: It is hypothesised that the saplings require 1-3 y to establish a crown trait in response to light levels in the forest; and species that can economically produce a leaf can adjust crown traits more quickly in an environment dominated by low light levels than species that are less economic.
Abstract: Light fluctuations and crown traits were studied for saplings of four tree species in a Costa Rican rain forest. Light fluctuations (1988-1994) were assessed by annual light estimations above saplings, using a visual crown position index. Crown traits in 1994 and growth between 1994 and 1995 were measured. Crown position values varied between 1.5 and 2.5. Of the 70 saplings only four were found at higher light levels (crown position of 3 or 3.5), but for 1-2 y only. Over the 6 y of investigation, 55-75 % of the saplings experienced no or only one light fluctuation, and 25-45 % two or three fluctuations. Crown traits in 1994 were either most strongly correlated with light levels in 1993 (Lecythis) and with light levels in 1991 and 1992 (Dipteryx and Simarouba), or they were not significantly correlated with light levels (Minquartia). It is hypothesised that: (1) the saplings require 1-3 y to establish a crown trait in response to light levels in the forest; and (2) and species that can economically produce a leaf can adjust crown traits more quickly in an environment dominated by low light levels than species that are less economic. Crown trait responses may track environmental changes in three of the four species, in particular in Lecythis. In this latter species, leaf area had no significant effect on growth and survival, whereas light level had a positive effect. Conversely, in the other three species, light levels had no discernible effect on growth and survival (due in part to low variation in crown position in two of these species), whereas leaf area had a positive effect on both.
49 citations
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30 Nov 1988
TL;DR: This work focuses on the development of a model for a scalable, scalable, and scalable approach to estimating the intensity of the response of the immune system to the presence of canine coronavirus.
Abstract: Introduction. Acknowledgements and Conceptual-ization. Procedure and Format. Acrocomia sclerocarpa. Acrocomia totai. Adhatoda vasica. Aleurites fordii. Aleurites moluccana. Aleurites montana. Amphicarpaea bracteata. Anacardium occi-dentale. Apios americana. Areca catechu. Arenga pinnata. Arto-carpus altilis. Artocarpus heterophyllus. Balanites aeqyptiaca. Bar-ringtonia procera. Bertholletia excelsa. Borassus flabellifer. Brosimum alicastrum. Brosimum utile. Bruguiera gymnorrhiza. Buchanania lanzan. Butyrospermum paradoxum. Calamus rotang. Canarium indicum. Canarium ovatum. Carya illinoiensis. Caryocar amygdaliferum. Caryocar nuciferum. Caryocar spp. Caryodendron orinocense. Castanea crenata. Castanea dentata. Castanea mollissima. Castanea pumila. Castanea sativa. Castanospermum australe. Ceiba pen-tandra. Cocos nucifera. Cola acuminata. Cola nitida. Cola verticil-lata. Cordeauxia edulis. Corylus americana. Corylus avellana. Corylus chinesis. Corylus colurna. Corylus cornuta. Corylus ferox. Corylus heterophylla. Corylus maxima. Coula edula. Cycas circinalis. Cyas revoluta. Cyas rumphii. Cyperus esculentus. Cyperus rotundus. Detarium senegalense. Elaeis guineensis. Elaesis oleifera. Eleocharis dulcis. Fagus grandifolia. Fagus syl-vatica. Ginkgo biloba. Gnetum gnemon. Heliathis annuus. Hy-phaene thebaica. Inocarpus edulis. Jatropha curcas. Jessenia bataua. Juglans ailanthifolia. Juglans cinerea. Juglans hindsii. Juglans nigra. Juglans regia. Lecythis elliptica. Lecythis ollaria. Lecythis pisonis. Licania rigida. Macadamia spp. Madhuca longifolia. Moringa oleifera. Nelumbo nucifera. Nypa fruticans. Orbigyna cohune. Orbigyna spp. Pachira aquatica. Paullinia cupana. Phytelephas macrocarpa. Pinus edulis. Pinus quadrifolia. Pistacia vera. Pittosporum resiniferum. Platonia esculenta. Prunus dulcis. Quercus suber. Ricinodendron heude-lotii. Ricinodendron rautanenii. Santalum acuminatum. Sapium seb-iferum. Schleichera oleosa. Sclerocarya caffra. Simmondsia chinensis. Telfairia occidentalis. Telfairia pedata. Terminalia cat-appa. Trapa spp. Treculia africana. Virola sebifera. Virola surinamensis. Illustrations Credits. References. Index.
42 citations
TL;DR: Comparing the results with the generic classification presented in the latest monograph of neotropical Lecythidaceae and making recommendations for a revised generic classification of the Bertholletia clade of Lecithidaceae are compared.
Abstract: Lecythidaceae subfam Lecythidoideae is limited to the Neotropics and is the only naturally occurring subfamily of Lecythidaceae in the New World A subset of genera with zygomorphic flowers— Bertholletia , Corythophora , Eschweilera and Lecythis —comprises a group of about 125 species called the Bertholletia clade A previous study based on plastid ndhF and trnL - F genes supported the monophyly of Corythophora but suggested that Eschweilera and Lecythis are not monophyletic Using this study as a baseline, we sampled more taxa and sequenced more loci to address the taxonomic problems of the ambiguous genera and to determine relationships within the Bertholletia clade Our results support the monophyly of the Bertholletia clade as previously circumscribed In addition, Corythophora is monophyletic, and the two accessions of Bertholletia excelsa come out together on the tree Results of the simultaneous analysis do not support the monophyly of Lecythis or Eschweilera Lecythis consists of four main groups (the Lecythis pisonis , L poiteaui , L chartacea , and L corrugata clades), the last of which is nested within Eschweilera , and Eschweilera consists of three clades (the Eschweilera integrifolia , E tetrapetala , and Eschweilera parvifolia clades) We compare our results with the generic classification presented in the latest monograph of neotropical Lecythidaceae and make recommendations for a revised generic classification of the Bertholletia clade of Lecythidaceae
35 citations
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