| Records |
| Author |
Orivel, J.; Corbara, B.; Dejean, A. |
| Title |
Constraints and adaptation in the arboreal life of ants |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biofutur |
Abbreviated Journal |
Biofutur |
| Volume |
315 |
Issue  |
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Pages |
34-37 |
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[Orivel, Jerome] CNRS, UMR Ecol Forets Guyane, Kourou 97379, French Guiana |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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0294-3506 |
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ISI:000284987300004 |
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no |
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EcoFoG @ eric.marcon @ |
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17 |
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Leroy, C.; Cereghino, R.; Camas, J.F.; Pelozuelo, L.; Dejean, A.; Corbara, B. |
| Title |
Several aspects of the life of vascular epiphytes |
Type |
Journal Article |
| Year |
2010 |
Publication |
Biofutur |
Abbreviated Journal |
Biofutur |
| Volume |
315 |
Issue |
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Pages |
38-41 |
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[Leroy, Celine] CNRS, UMR Ecol Forets Guyane, Kourou 97379, French Guiana |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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0294-3506 |
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ISI:000284987300005 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
18 |
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| Author |
Hmimina, G.; Dufrêne, E.; Pontailler, J.-Y.; Delpierre, N.; Aubinet, M.; Caquet, B.; de Grandcourt, A.; Burban, B.; Flechard, C.; Granier, A.; Gross, P.; Heinesch, B.; Longdoz, B.; Moureaux, C.; Ourcival, J.-M.; Rambal, S.; Saint André, L.; Soudani, K. |
| Title |
Evaluation of the potential of MODIS satellite data to predict vegetation phenology in different biomes: An investigation using ground-based NDVI measurements |
Type |
Journal Article |
| Year |
2013 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
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| Volume |
132 |
Issue |
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Pages |
145-158 |
| Keywords |
Crops; Deciduous forests; Evergreen forests; Ground-based NDVI; Modis; Phenology |
| Abstract |
Vegetation phenology is the study of the timing of seasonal events that are considered to be the result of adaptive responses to climate variations on short and long time scales. In the field of remote sensing of vegetation phenology, phenological metrics are derived from time series of optical data. For that purpose, considerable effort has been specifically focused on developing noise reduction and cloud-contaminated data removal techniques to improve the quality of remotely-sensed time series. Comparative studies between time series composed of satellite data acquired under clear and cloudy conditions and from radiometric data obtained with high accuracy from ground-based measurements constitute a direct and effective way to assess the operational use and limitations of remote sensing for predicting the main plant phenological events. In the present paper, we sought to explicitly evaluate the potential use of MODerate resolution Imaging Spectroradiometer (MODIS) remote sensing data for monitoring the seasonal dynamics of different types of vegetation cover that are representative of the major terrestrial biomes, including temperate deciduous forests, evergreen forests, African savannah, and crops. After cloud screening and filtering, we compared the temporal patterns and phenological metrics derived from in situ NDVI time series and from MODIS daily and 16-composite products. We also evaluated the effects of residual noise and the influence of data gaps in MODIS NDVI time series on the identification of the most relevant metrics for vegetation phenology monitoring. The results show that the inflexion points of a model fitted to a MODIS NDVI time series allow accurate estimates of the onset of greenness in the spring and the onset of yellowing in the autumn in deciduous forests (RMSE ≤ one week). Phenological metrics identical to those provided with the MODIS Global Vegetation Phenology product (MDC12Q2) are less robust to data gaps, and they can be subject to large biases of approximately two weeks or more during the autumn phenological transitions. In the evergreen forests, in situ NDVI time series describe the phenology with high fidelity despite small temporal changes in the canopy foliage. However, MODIS is unable to provide consistent phenological patterns. In crops and savannah, MODIS NDVI time series reproduce the general temporal patterns of phenology, but significant discrepancies appear between MODIS and ground-based NDVI time series during very localized periods of time depending on the weather conditions and spatial heterogeneity within the MODIS pixel. In the rainforest, the temporal pattern exhibited by a MODIS 16-day composite NDVI time series is more likely due to a pattern of noise in the NDVI data structure according to both rainy and dry seasons rather than to phenological changes. More investigations are needed, but in all cases, this result leads us to conclude that MODIS time series in tropical rainforests should be interpreted with great caution. © 2013 Elsevier Inc. |
| Address |
INRA, Unité Biogéochimie des Ecosystèmes Forestiers, Champenoux, France |
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| Notes |
Export Date: 21 February 2013; Source: Scopus |
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no |
| Call Number |
EcoFoG @ webmaster @ |
Serial |
467 |
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| Author |
Audigeos, D.; Buonamici, A.; Belkadi, L.; Rymer, P.; Boshier, D.; Scotti-Saintagne, C.; Vendramin, G.G.; Scotti, I. |
| Title |
Aquaporins in the wild: natural genetic diversity and selective pressure in the PIP gene family in five Neotropical tree species |
Type |
Journal Article |
| Year |
2010 |
Publication |
BMC Evolutionary Biology |
Abbreviated Journal |
BMC Evol. Biol. |
| Volume |
10 |
Issue |
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Pages |
18 |
| Keywords |
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| Abstract |
Background: Tropical trees undergo severe stress through seasonal drought and flooding, and the ability of these species to respond may be a major factor in their survival in tropical ecosystems, particularly in relation to global climate change. Aquaporins are involved in the regulation of water flow and have been shown to be involved in drought response; they may therefore play a major adaptive role in these species. We describe genetic diversity in the PIP sub-family of the widespread gene family of Aquaporins in five Neotropical tree species covering four botanical families. Results: PIP Aquaporin subfamily genes were isolated, and their DNA sequence polymorphisms characterised in natural populations. Sequence data were analysed with statistical tests of standard neutral equilibrium and demographic scenarios simulated to compare with the observed results. Chloroplast SSRs were also used to test demographic transitions. Most gene fragments are highly polymorphic and display signatures of balancing selection or bottlenecks; chloroplast SSR markers have significant statistics that do not conform to expectations for population bottlenecks. Although not incompatible with a purely demographic scenario, the combination of all tests tends to favour a selective interpretation of extant gene diversity. Conclusions: Tropical tree PIP genes may generally undergo balancing selection, which may maintain high levels of genetic diversity at these loci. Genetic variation at PIP genes may represent a response to variable environmental conditions. |
| Address |
[Audigeos, Delphine; Belkadi, Laurent; Scotti-Saintagne, Caroline; Scotti, Ivan] INRA, UMR EcoFoG Ecol Forets Guyane 0745, Kourou 97387, French Guiana, Email: ivan.scotti@cirad.fr |
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| Publisher |
BIOMED CENTRAL LTD |
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1471-2148 |
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| Notes |
ISI:000280369200002 |
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no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
47 |
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| Author |
Stahl, C.; Burban, B.; Bompy, F.; Jolin, Z.B.; Sermage, J.; Bonal, D. |
| Title |
Seasonal variation in atmospheric relative humidity contributes to explaining seasonal variation in trunk circumference of tropical rain-forest trees in French Guiana |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
| Volume |
26 |
Issue |
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Pages |
393-405 |
| Keywords |
bark; drought; secondary growth; seasonality; tropical rain forest; water |
| 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. |
| Address |
[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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| Publisher |
CAMBRIDGE UNIV PRESS |
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| ISSN |
0266-4674 |
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| Notes |
ISI:000279100600005 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
57 |
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| Author |
Kenne, M.; Feneron, R.; Djieto-Lordon, C.; Malherbe, M.C.; Tindo, M.; Ngnegueu, P.R.; Dejean, A. |
| Title |
Nesting and foraging habits in the arboreal ant Atopomyrmex mocquerysi ANDRE, 1889 (Hymenoptera: Formicidae: Myrmicinae) |
Type |
Journal Article |
| Year |
2009 |
Publication |
Myrmecological News |
Abbreviated Journal |
Myrmecol. News |
| Volume |
12 |
Issue |
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Pages |
109-115 |
| Keywords |
Cameroon; wood-excavating ant; nest site selection; pest ant; predatory behavior; rhythm of activity; life history |
| Abstract |
Atopomyrmex mocquerysi ANDRE, 1889 is a West-Central African wood-excavating myrmicine species whose colonies construct galleries in the main live branches of their host trees, causing the distal parts of these branches to dry out. In southeastern Cameroon, this species was mainly found in woody savannahs that are burned annually. It was also present in the canopy of a secondary forest, but was relatively rare on trees growing along forest edges and entirely absent from the canopy of an old-growth forest. It was absent from oil palm and coffee tree plantations, rare on cocoa trees. present on 0.2% to 5.3% of the avocado, guava, mango and Citrus spp. trees monitored, and frequent on safoo trees (12.4%). A fire in a mango plantation seems to have favored its presence. The colonies generally exploit Aleyrodidae, Aphididae, Coccidae, and Stictococcidae. Workers forage for prey diurnally, mostly on the ground. Their predatory behavior is characterized by detection through contact. Workers recruit nestmates at short-range (within range of an alarm pheromone), rarely at long-range, after which they spread-eagle the prey and immediately cut it up on the spot. Individual workers retrieve the prey pieces. Unlike other territorially-dominant arboreal ants, A. mocquerysi is a threat to host trees because. in addition to being a wood-excavating species, its workers only slightly protect the foliage of their host tree from herbivorous insects since they mostly hunt on the ground. |
| Address |
[Kenne, Martin; Tindo, Maurice] Univ Douala, Fac Sci, Dept Biol Organismes Anim, Douala, Cameroon, Email: medoum68@yahoo.fr |
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| Publisher |
OESTERREICHISCHE GESELL ENTOMOFAUNISTIK, C/O NATURHISTOR MUSEUM WIEN |
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1994-4136 |
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| Notes |
ISI:000271357700012 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
97 |
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| Author |
Paine, C.E.T.; Harms, K.E.; Ramos, J. |
| Title |
Supplemental irrigation increases seedling performance and diversity in a tropical forest |
Type |
Journal Article |
| Year |
2009 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
| Volume |
25 |
Issue |
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Pages |
171-180 |
| Keywords |
diversity; Estacion Biologica Los Amigos; habitat filtering; palms; Peru; precipitation; seasonality; seedling recruitment |
| 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. |
| Address |
[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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0266-4674 |
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| Notes |
ISI:000264212400006 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
118 |
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Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
| Title |
Flowering as a key factor in ant-Philodendron interactions |
Type |
Journal Article |
| Year |
2008 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
| Volume |
24 |
Issue |
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Pages |
689-692 |
| Keywords |
Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
| Abstract |
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| Address |
[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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| Notes |
ISI:000261254400012 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
128 |
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| Author |
Baraloto, C.; Bonal, D.; Goldberg, D.E. |
| Title |
Differential seedling growth response to soil resource availability among nine neotropical tree species |
Type |
Journal Article |
| Year |
2006 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
| Volume |
22 |
Issue |
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Pages |
487-497 |
| Keywords |
biomass allocation; Dicorynia; drought stress; Eperua; French Guiana; Goupia; Jacaranda; plasticity; Qualea; Recordorylon; relative growth rate; Sextonia; soil phosphorus; specific leaf area; Virola |
| Abstract |
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. |
| Address |
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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| Notes |
ISI:000239975200001 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
178 |
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| Author |
Epron, D.; Bosc, A.; Bonal, D.; Freycon, V. |
| Title |
Spatial variation of soil respiration across a topographic gradient in a tropical rain forest in French Guiana |
Type |
Journal Article |
| Year |
2006 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
| Volume |
22 |
Issue |
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Pages |
565-574 |
| Keywords |
acrisol; carbon balance; carbon flux; gleysol; root biomass |
| 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. |
| Address |
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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| Notes |
ISI:000239975200008 |
Approved |
no |
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EcoFoG @ eric.marcon @ |
Serial |
179 |
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