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Stahl, C.; Burban, B.; Bompy, F.; Jolin, Z.B.; Sermage, J.; Bonal, D. |
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Title |
Seasonal variation in atmospheric relative humidity contributes to explaining seasonal variation in trunk circumference of tropical rain-forest trees in French Guiana |
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Journal Article |
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Year |
2010 |
Publication  |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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Volume |
26 |
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Pages |
393-405 |
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Keywords |
bark; drought; secondary growth; seasonality; tropical rain forest; water |
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Abstract |
Large seasonal variation in the rate of change in girth of tropical rain-forest tree species has been described, but its origin is still under debate. We tested whether this variation might be related to variation in atmospheric relative humidity through its influence on bark water content and thickness. Variation in trunk circumference of 182 adult trees was measured about twice a month in an undisturbed tropical rain forest over 18 mo using dendrometers. Furthermore, a laboratory experiment was conducted to test the direct influence of relative air humidity on bark water content and thickness. in the field, most trees displayed highly positive rates of change in girth at the onset of the wet season, while a quarter of the trees displayed negative changes during long dry seasons, whatever their total annual growth. This variation was correlated with environmental conditions, particularly with atmospheric relative humidity. Trees with high bark water content and thickness displayed a stronger decrease in girth during the dry season. in the chamber experiment, desiccation induced a decrease in the diameter of the trunk sections in tandem with a decrease in bark water content. As a result, seasonal variation in the rate of change in girth of tropical rain-forest trees reflects variation in trunk biophysical properties, through the influence of relative humidity on bark properties. but not directly variation in secondary growth. |
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[Stahl, Clement; Burban, Benoit; Bompy, Felix; Jolin, Zachari B.; Sermage, Juliette; Bonal, Damien] INRA, UMR Ecol Forets Guyane 745, Kourou 97387, French Guiana, Email: bonal@nancy.inra.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000279100600005 |
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EcoFoG @ eric.marcon @ |
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57 |
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Paine, C.E.T.; Harms, K.E.; Ramos, J. |
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Title |
Supplemental irrigation increases seedling performance and diversity in a tropical forest |
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Journal Article |
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Year |
2009 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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25 |
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171-180 |
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diversity; Estacion Biologica Los Amigos; habitat filtering; palms; Peru; precipitation; seasonality; seedling recruitment |
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Abstract |
Diversity is positively correlated with water availability at global, continental and regional scales. With the objective of better understanding the mechanisms that drive these relationships. we investigated the degree to which variation in water availability affects the performance (recruitment, growth a rid survival) of juvenile trees. Precipitation was supplemented throughout two dry seasons in a seasonal moist forest in south-eastern Peru. Supplementing precipitation by 160 mm mo(-1), we increased soil moisture by 17%. To generate seedling communities or known species composition, we sowed 3840 seeds of 12 species. We monitored the fates of the 554 seedlings recruited from the sown seeds. as well as 1856 older non-sown seedlings (10 cm <= height < 50 cm), and 2353 saplings (> 1 m tall). Watering significantly enhanced young seedling growth and survival, increasing stern density and diversity. Watering diminished the recruitment of species associated with upland forests, but increased the survival of both upland- and lowland-associated species. Though supplemental watering increased the growth of older seedlings. their density and diversity were unaffected. Sapling performance was insensitive to watering. We infer that variation in dry-season water availability may affect seedling community structure by differentially affecting recruitment and increasing overall survival. These results suggest that differential seedling recruitment and survival may contribute to the observed relationships between water availability, habitat associations and patterns of tree species richness. |
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[Paine, C. E. Timothy; Harms, Kyle E.] Louisiana State Univ, Dept Biol Sci, Baton Rouge, LA 70803 USA, Email: timothy.paine@ecofog.gf |
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CAMBRIDGE UNIV PRESS |
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ISI:000264212400006 |
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EcoFoG @ eric.marcon @ |
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118 |
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Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
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Title |
Flowering as a key factor in ant-Philodendron interactions |
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Journal Article |
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Year |
2008 |
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Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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24 |
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689-692 |
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Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
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[Gibernau, Marc; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR CNRS 5174, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000261254400012 |
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EcoFoG @ eric.marcon @ |
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128 |
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Baraloto, C.; Bonal, D.; Goldberg, D.E. |
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Title |
Differential seedling growth response to soil resource availability among nine neotropical tree species |
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Journal Article |
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Year |
2006 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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22 |
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487-497 |
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Keywords |
biomass allocation; Dicorynia; drought stress; Eperua; French Guiana; Goupia; Jacaranda; plasticity; Qualea; Recordorylon; relative growth rate; Sextonia; soil phosphorus; specific leaf area; Virola |
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Although the potential contribution to tropical tree species coexistence of niche differentiation along light gradients has received much attention, the degree to which species perform differentially along soil resource gradients remains unclear. To examine differential growth response to soil resources, we grew seedlings of nine tropical tree species at 6.0% of full sun for 12 mo in a factorial design of two soil types (clay and white sand), two phosphate fertilization treatments (control and addition of 100 mg P kg(-1)) and two watering treatments (field capacity and water limitation to one-third field capacity). Species differed markedly in biomass growth rate, but this hierarchy was almost completely conserved across all eight treatments. All species grew more slowly in sand than clay soils. and no species grew faster with phosphate additions. Only Eperua grandiflora and E. falcata showed significant growth increases in the absence of water limitation. Faster-growing species were characterized by high specific leaf area, high leaf allocation and high net assimilation rate but not lower root allocation. Slower-growing species exhibited greater plasticity in net assimilation rate. suggesting that tolerance of edaphic stress in these species is related more to stomatal control than to whole-plant carbon allocation. Although relative growth rate for biomass was correlated with both its physiological and morphological components. interspecific differences were best explained by differences in net assimilation rate across six of the eight treatments. A suite of traits including high assimilation and high specific leaf area maintains rapid growth rate of faster-growing species across a wide gradient of soil resources, but the lack of plasticity they exhibit may compromise their survival in the poorest soil environments. |
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Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USA, Email: baraloto.c@kourou.cirad.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000239975200001 |
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EcoFoG @ eric.marcon @ |
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178 |
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Epron, D.; Bosc, A.; Bonal, D.; Freycon, V. |
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Title |
Spatial variation of soil respiration across a topographic gradient in a tropical rain forest in French Guiana |
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Journal Article |
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Year |
2006 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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22 |
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565-574 |
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Keywords |
acrisol; carbon balance; carbon flux; gleysol; root biomass |
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Abstract |
The objective of this study was to analyse the factors explaining spatial variation in soil respiration over topographic transects in a tropical rain forest of French Guiana. The soil of 30 plots along six transects was characterized. The appearance of the 'dry to the touch' character at a depth of less than 1.2 m was used to discriminate soils exhibiting vertical drainage from soils exhibiting superficial lateral drainage and along with colour and texture, to define five classes from well-drained to strongly hydromorphic soils. Spatial variation in soil respiration was closely related to topographic position and soil type. Increasing soil water content and bulk density and decreasing root biomass and soil carbon content explained most of the decrease in soil respiration from the plateaux (vertically drained hypoferralic acrisol) to the bottomlands (haplic gleysol). These results will help to stratify further field experiments and to identify the underlying determinants of spatial variation in soil respiration to develop mechanistic models of soil respiration. |
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Univ Nancy 1, UMR 1137, INRA, UHP Ecol & Ecophysiol Forestieres,Fac Sci, F-54506 Vandoeuvre Les Nancy, France, Email: Daniel.Epron@scbiol.uhp-nancy.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000239975200008 |
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EcoFoG @ eric.marcon @ |
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179 |
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Bereau, M.; Bonal, D.; Louisanna, E.; Garbaye, J. |
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Do mycorrhizas improve tropical tree seedling performance under water stress and low light conditions? A case study with Dicorynia guianensis (Caesalpiniaceae) |
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Journal Article |
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Year |
2005 |
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Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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21 |
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375-381 |
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French Guiana; leaf gas exchange; mycorrhizal symbiosis; tropical forest; water limitation |
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We tested the response of seedlings of Diconyina guianensis, a major timber tree species of French Guiana, to mycorrhizal symbiosis and water limitation in a semi-con trolled experiment under natural light conditions. Under well-watered conditions, mycorrhizal colonization resulted in an increase of net photosynthesis, growth and phosphorus uptake. When submitted to water stress, no growth reduction of mycorrhizal seedlings was observed. Mycorrhizal seedlings were more sensitive to drought than non-mycorrhizal ones in terms of carbon assimilation, but not with regard to stomatal closure. In contrast to previous studies on temperate tree seedlings, this result precludes a mycorrhizal effect on the hydraulic properties of this species. Furthermore, our results suggest that below a specific threshold of soil moisture, carbon assimilation of D. guianensis seedlings was decreased by the mycorrhizal symbiosis. This is probably related to the competition between the plant and its host fungus for carbon allocation under low light intensity, even though it did not seem to have a significant effect on mortality in our experiment. |
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UMR Ecofog, Kourou 97387, French Guiana, Email: bercau.m@kourou.cirad.fr |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000231009300003 |
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EcoFoG @ eric.marcon @ |
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232 |
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Koponen, P.; Nygren, P.; Domenach, A.M.; Le Roux, C.; Saur, E.; Roggy, J.C. |
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Title |
Nodulation and dinitrogen fixation of legume trees in a tropical freshwater swamp forest in French Guiana |
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Journal Article |
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2003 |
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Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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19 |
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655-666 |
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acetylene reduction assay; Bradyrhizobium; flooding; microtopography; N-15 natural abundance method; 16S rDNA sequencing |
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Nodulated legume trees comprised 43% of the stand basal area in the low, most frequently flooded microsites, and 23% in higher, drier microsites in a tropical freshwater swamp forest in French Guiana. Dinitrogen fixation in Pterocarpus officinalis, Hydrochorea corymbosa and Inga pilosula was confirmed by acetylene reduction assay (ARA), presence of leghaemoglobin in nodules and the N-15 natural abundance method. The results for Zygia cataractae were inconclusive but suggested N-2 fixation in drier microsites. Nodulated Inga disticha had a N-15-to-N-14 ratio similar to non-N-2-fixing trees, but ARA indicated nitrogenase activity and leghaemoglobin was present in nodules. All bacterial strains were identified as Bradyrhizobium spp. according to the partial 16S rDNA sequences, and they were infective in vitro in the model species Macroptilium atropurpuretan. About 35-50% of N in the leaves of P. officinalis, H. corymbosa and I. pilosula was fixed from the atmosphere. Dinitrogen fixation was estimated to contribute at least 8-13% and 1728% to whole-canopy N in high and low microsites, respectively. Symbiotic N, fixation appears to provide both a competitive advantage to legume trees under N-limited, flooded conditions and an important N input to neotropical freshwater swamp forests. |
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Univ Helsinki, Dept Forest Ecol, FIN-00014 Helsinki, Finland |
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CAMBRIDGE UNIV PRESS |
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0266-4674 |
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ISI:000186710800005 |
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EcoFoG @ eric.marcon @ |
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242 |
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Fonty, E.; Molino, J.F.; Prevost, M.F.; Sabatier, D. |
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A new case of neotropical monodominant forest: Spirotropis longifolia (Leguminosae-Papilionoideae) in French Guiana |
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2011 |
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Journal of Tropical Ecology |
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J. Trop. Ecol. |
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27 |
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6 |
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641-644 |
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French Guiana; layering; monodominance; sprouting; supporting strategy; suppressive strategy; tropical rain forests |
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[Fonty, E] ONF, Direct Reg Guyane, F-97300 Cayenne, France, Email: emile.fonty@free.fr |
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Cambridge Univ Press |
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0266-4674 |
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WOS:000296208500009 |
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EcoFoG @ webmaster @ |
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371 |
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Zalamea, P.-C.; Sarmiento, C.; Stevenson, P.R.; Rodríguez, M.; Nicolini, E.; Heuret, P. |
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Title |
Effect of rainfall seasonality on the growth of Cecropia sciadophylla: Intra-annual variation in leaf production and node length |
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Journal Article |
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2013 |
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Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
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29 |
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4 |
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361-365 |
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leaf phenology; Neotropics; pioneer plants; plant growth; plant morphology; rainfall seasonality; Urticaceae |
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Patterns of leaf production and leaf fall directly influence leaf area index and forest productivity. Here, we focused on Cecropia sciadophylla individuals inhabiting the extremes of the gradient in seasonality in rainfall at which C. sciadophylla occurs. In Colombia and French Guiana we compared the intra-annual variation in leaf production as well as the intra-annual fluctuation in internode length on a total of 69 saplings ranging in size from 1 to 2 m. The mean rate of leaf production was ~2 leaves mo -1 in both populations, and the rate of leaf production was constant throughout the year. Our results showed monthly variation in internode length and the number of live leaves per sapling in the seasonal habitat and variation only in internode length in the everwet habitat. Because the rate of leaf production is constant at both localities, the difference in number of live leaves per sapling at the seasonal site must reflect seasonal variation in leaf life span. We show that in Cecropia, internode length can serve as an indicator of precipitation seasonality. Finally an open question is whether leaf production in other pioneer species is also independent of climatic seasonal cues. This information could allow us to link growth and climate of secondary forest species and better understand how past and future climate can affect plant growth trajectories. © Cambridge University Press 2013. |
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INRA, UMR ECOFOG, Kourou F-97310, French Guiana |
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Export Date: 14 July 2013; Source: Scopus |
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EcoFoG @ webmaster @ |
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496 |
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Richard-Hansen, C.; Jaouen, G.; Denis, T.; Brunaux, O.; Marcon, E.; Guitet, S. |
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Landscape patterns influence communities of medium-to large-bodied vertebrates in undisturbed terra firme forests of French Guiana |
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2015 |
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Journal of Tropical Ecology |
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Journal of Tropical Ecology |
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31 |
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5 |
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423-436 |
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Animal communities; diversity; environmental heterogeneity; French Guiana; landscape ecology; species-habitat association |
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Whereas broad-scale Amazonian forest types have been shown to influence the structure of the communities of medium-to large-bodied vertebrates, their natural heterogeneity at smaller scale or within the terra firme forests remains poorly described and understood. Diversity indices of such communities and the relative abundance of the 21 most commonly observed species were compared from standardized line-transect data across 25 study sites distributed in undisturbed forests in French Guiana. We first assessed the relevance of a forest typology based on geomorphological landscapes to explain the observed heterogeneity. As previously found for tree beta-diversity patterns, this new typology proved to be a non-negligible factor underlying the beta diversity of the communities of medium-to large bodied vertebrates in French Guianan terra firme forests. Although the species studied are almost ubiquitous across the region, they exhibited habitat preferences through significant variation in abundance and in their association index with the different landscape types. As terra firme forests represent more than 90% of the Amazon basin, characterizing their heterogeneity-including faunal communities-is a major challenge in neotropical forest ecology. © 2015 Cambridge University Press. |
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ONCFS, EcoFoG, Kourou Cedex, France |
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Export Date: 16 November 2015 |
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638 |
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