| Records |
| Author |
Amusant, N.; Fournier, M.; Beauchene, J. |
| Title |
Colour and decay resistance and its relationships in Eperua grandiflora |
Type |
Journal Article |
| Year |
2008 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
| Volume |
65 |
Issue |
8 |
Pages |
806 |
| Keywords |
natural durability; colour; decay resistance; variability; heartwood; tropical wood |
| Abstract |
Eperua grandiflora, which is widely distributed in the French Guiana forest region, shows high variability in decay resistance. Further information concerning this wood quality parameter is necessary, but standard testing methods are complex and time-consuming. We assessed the use of colorimetry to determine durability in heartwood samples from a range of trees. Eperua grandiflora colour parameters were measured using a CIELAB system, revealing that the tree effect was greater than the radial position and height effects. The wood samples were exposed to Coriolus versicolor and Antrodia sp. according to two European standards (En 350-1 and XP CEN TS 15083-1). Eperua grandiflora is more susceptible to brown rot. These two standards did not give the same durability classes. The high variation in natural durability was due to the tree effect. These two properties were found to be correlated and the assessment also distinguished the extreme durability classes but they are not sufficient to classify the class of durability of this species. |
| Address |
[Amusant, Nadine] CIRAD, PERSYT, UR Valorisat Bois Tropicaux, F-34538 Montpellier 5, France, Email: nadine.amusant@cirad.fr |
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| Publisher |
EDP SCIENCES S A |
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Edition |
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| ISSN |
1286-4560 |
ISBN |
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| Notes |
ISI:000261431600006 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
127 |
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| Author |
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 |
|
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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| Publisher |
CAMBRIDGE UNIV PRESS |
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Series Issue |
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Edition |
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| ISSN |
0266-4674 |
ISBN |
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| Notes |
ISI:000261254400012 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
128 |
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| Author |
Almeras, T. |
| Title |
Mechanical analysis of the strains generated by water tension in plant stems. Part II: strains in wood and bark and apparent compliance |
Type |
Journal Article |
| Year |
2008 |
Publication |
Tree Physiology |
Abbreviated Journal |
Tree Physiol. |
| Volume |
28 |
Issue |
10 |
Pages |
1513-1523 |
| Keywords |
biomechanics; calibration; diurnal strains; mechanical model; multilayer cylinder; water potential |
| Abstract |
Tree steins shrink in diameter during the day and swell during the night in response to changes in water tension in the xylem. Stein shrinkage can easily be measured in a nondestructive way, to derive continuous information about tree water status. The relationship between the strain and the change in water tension can be evaluated by empirical calibrations, or can be related to the structure of the plant. A mechanical analysis was performed to make this relationship explicit. The stem is modeled as a cylinder made of multiple layers of tissues, including heartwood, sapwood, and inner and outer bark. The effect of changes in water tension on the apparent strain at the surface of a tissue is quantified as a function of parameters defining stem anatomy and the mechanical properties of the tissues. Various possible applications in the context of tree physiology are suggested. |
| Address |
INRA UMR Ecofog, Kourou 97379, French Guiana, Email: t_almeras@hotmail.com |
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| Publisher |
HERON PUBLISHING |
Place of Publication |
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| Language |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0829-318X |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000260027200009 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
129 |
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| Author |
McClure, M.; Chouteau, M.; Dejean, A. |
| Title |
Territorial aggressiveness on the arboreal ant Azteca alfari by Camponotus blandus in French Guiana due to behavioural constraints |
Type |
Journal Article |
| Year |
2008 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
| Volume |
331 |
Issue |
9 |
Pages |
663-667 |
| Keywords |
Azteca alfari (Dolichoderinae); Camponotus blandus (Formicinae); foraging; rhythm of activity; territorial aggressiveness |
| Abstract |
This study reports new information on interactions between two sympatric ant species, the plant-ant Azteca alfari (Dolichoderinae) living in association with the myrmecophyte Cecropia obtusa (Cecropiaceae) and Camponotus blandus (Formicinae), a ground-nesting, arboreal-foraging species. Workers of A. alfari forage only on the foliage and the tipper parts of the trunk of their host Cecropia, while C. blandus nests in the ground but frequently forages and patrols pioneer tree foliage, including Cecropia. The activity pattern of A. alfari and the number of C. blandus on Cecropia obtusa was monitored hourly during a two-day period in a disturbed area in French Guiana. The maximum activity of C. blandus occurred between 8:30 and 12:30, at which time A. alfari had retreated within the domatia and were least present on the trunks. Even though aggressive confrontations were observed, C. blandus workers often initiate confrontations but do not prey on A. alfari nor exploit food bodies produced by Cecropia, the principal food source of A. alfari. Hence hostility appears to be the result of territoriality. Differences in their foraging rhythms are proposed as promoting resource and territory partitioning in this ant assemblage. |
| Address |
[McClure, Melanie] Concordia Univ, Dept Biol, Montreal, PQ H4B 1R6, Canada, Email: m_mcclur@alcor.concordia.ca |
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| Publisher |
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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Series Issue |
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Edition |
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| ISSN |
1631-0691 |
ISBN |
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| Notes |
ISI:000259290200004 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
130 |
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| Author |
Herault, B.; Bornet, A.; Tremolieres, M. |
| Title |
Redundancy and niche differentiation among the European invasive Elodea species |
Type |
Journal Article |
| Year |
2008 |
Publication |
Biological Invasions |
Abbreviated Journal |
Biol. Invasions |
| Volume |
10 |
Issue |
7 |
Pages |
1099-1107 |
| Keywords |
biological traits; functional equivalence; invasivness; niche overlapping; waterweeds |
| Abstract |
Community ecologists implicitly assume redundancy when they aggregate species into functional groups. But there have been remarkably few empirical efforts to investigate the accuracy of this concept in situ. The concept of redundancy could be roughly split into two components: the ecological redundancy (similar response to environmental variations involving similar ecological processes) and the functional redundancy (similar biological trait combinations shaping similar functional processes). Both types of redundancy are tested among the 3 invasive European Elodeas. In 11 sites and during two successive years 2004-2005, the cover growth rate of each Elodea species was monthly recorded. To test ecological redundancy, cover growth rates were related to a large suite of environmental variables. To test functional redundancy, 13 biological traits involved in competitive relationships were measured each month. Firstly, the redundancy hypothesis looks problematic for Elodea ernstiae. Indeed, the later possess numerous biological traits involved in light competition and niche overlap with the other Elodeas is very low. Secondly, ecological and functional redundancy can be successfully applied to Elodea canadensis and Elodea nuttallii. They share a large suite of biological traits leading to wide niche overlaps through the growing season. And the measured environmental variables do not differentially influence their growth rates, which are, in turn, controlled by a similar group of biological traits. In this way, the different invasiveness patterns of E. canadensis and E. nuttallii could be solely due to the ecological drift and their ecological dynamic could follow neutral rules. |
| Address |
[Herault, Bruno] Univ Antilles Guyane, INRA, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: Bruno.Herault@cirad.fr |
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SPRINGER |
Place of Publication |
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Series Issue |
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Edition |
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| ISSN |
1387-3547 |
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| Notes |
ISI:000258704400015 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
131 |
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| Author |
Li, M.C.; Royer, M.; Stien, D.; Lecante, A.; Roos, C. |
| Title |
Inhibitive effect of sodium eperuate on zinc corrosion in alkaline solutions |
Type |
Journal Article |
| Year |
2008 |
Publication |
Corrosion Science |
Abbreviated Journal |
Corrosion Sci. |
| Volume |
50 |
Issue |
7 |
Pages |
1975-1981 |
| Keywords |
zinc; concrete; EIS; alkaline corrosion; passivity |
| Abstract |
The effect of sodium eperuate prepared from Wallaba (Eperua falcata Aubl) extract on zinc corrosion was investigated in alkaline solutions with chloride ions (i.e., simulated concrete pore solutions) by using electrochemical techniques. Sodium eperuate inhibits the corrosion of zinc in 0.1 M NaCl solutions with pH 9.6. As its concentration increases to 1 g/L, the inhibition efficiency reaches approximately 92%. In alkaline solutions with pH 12.6, sodium eperuate has no adverse effect on passivity of zinc, and retards the chloride attack. These suggest that sodium eperuate is an effective inhibitor for the protection of zinc in alkaline environments. (c) 2008 Elsevier Ltd. All rights reserved. |
| Address |
[Li, M. C.; Royer, M.; Stien, D.] UMR ECOFOG, CNRS, F-97337 Cayenne, French Guiana, Email: mouchengli@yahoo.com.cn |
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Thesis |
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| Publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
Place of Publication |
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Summary Language |
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Series Issue |
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Edition |
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| ISSN |
0010-938X |
ISBN |
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Conference |
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| Notes |
ISI:000258543600021 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
132 |
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| Author |
Bonal, D.; Bosc, A.; Ponton, S.; Goret, J.Y.; Burban, B.; Gross, P.; Bonnefond, J.M.; Elbers, J.; Longdoz, B.; Epron, D.; Guehl, J.M.; Granier, A. |
| Title |
Impact of severe dry season on net ecosystem exchange in the Neotropical rainforest of French Guiana |
Type |
Journal Article |
| Year |
2008 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
| Volume |
14 |
Issue |
8 |
Pages |
1917-1933 |
| Keywords |
dry season; ecosystem respiration; eddy covariance; gross ecosystem productivity; Neotropical rainforest; net ecosystem productivity; soil drought; solar radiation |
| Abstract |
The lack of information on the ways seasonal drought modifies the CO2 exchange between Neotropical rainforest ecosystems and the atmosphere and the resulting carbon balance hinders our ability to precisely predict how these ecosystems will respond as global environmental changes force them to face increasingly contrasting conditions in the future. To address this issue, seasonal variations in daily net ecosystem productivity (NEPd) and two main components of this productivity, daily total ecosystem respiration (R-Ed) and daily gross ecosystem productivity (GEP(d)), were estimated over 2 years at a flux tower site in French Guiana, South America (5 degrees 16'54'N, 52 degrees 54'44'W). We compared seasonal variations between wet and dry periods and between dry periods of contrasting levels of intensity (i.e. mild vs. severe) during equivalent 93-day periods. During the wet periods, the ecosystem was almost in balance with the atmosphere (storage of 9.0 g C m(-2)). Seasonal dry periods, regardless of their severity, are associated with higher incident radiation and lower R-Ed combined with reduced soil respiration associated with low soil water availability. During the mild dry period, as is normally the case in this region, the amount of carbon stored in the ecosystem was 32.7 g C m(-2). Severe drought conditions resulted in even lower R-Ed, whereas the photosynthetic activity was only moderately reduced and no change in canopy structure was observed. Thus, the severe dry period was characterized by greater carbon storage (64.6 g C m(-2)), emphasizing that environmental conditions, such as during a severe drought, modify the CO2 exchange between Neotropical rainforest ecosystems and the atmosphere and potentially the resulting carbon balance. |
| Address |
[Bonal, Damien; Goret, Jean-Yves; Burban, Benoit] INRA, UMR Ecol Forets Guyane, Kourou 97387, French Guiana, Email: damien.bonal@kourou.cirad.fr |
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| Publisher |
BLACKWELL PUBLISHING |
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Series Issue |
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Edition |
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| ISSN |
1354-1013 |
ISBN |
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| Notes |
ISI:000257712400015 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
133 |
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| Author |
Paine, C.E.T.; Harms, K.E.; Schnitzer, S.A.; Carson, W.P. |
| Title |
Weak competition among tropical tree seedlings: Implications for species coexistence |
Type |
Journal Article |
| Year |
2008 |
Publication |
Biotropica |
Abbreviated Journal |
Biotropica |
| Volume |
40 |
Issue |
4 |
Pages |
432-440 |
| Keywords |
Brosimum alicastrum; competitive irrelevance; maintenance of biodiversity; Matisia cordata; resource competition; Panama; Peru; Pouteria reticulata; zone of influence |
| Abstract |
The intensity of competition among forest tree seedlings is poorly understood, but has important ramifications for their recruitment and for the maintenance of species diversity. Intense competition among seedlings could allow competitively dominant species to exclude subordinate species. Alternatively, the low density and small stature of forest tree seedlings could preclude intense interseedling competition. In this case, other processes, such as size-asymmetric competition with adults, interactions with consumers, or neutral dynamics would prevail as those structuring the forest understory. We tested the intensity of, and potential for, intraspecific competition among tree seedlings of three species (Brosimum alicastrum, Matisia cordata, and Pouteria reticulata) in two Neotropical rain forests. We reduced stem densities by up to 90 percent and monitored individual growth and survival rates for up to 24 mo. Individual growth and survival rates were generally unrelated to stem density. Contrary to the predicted behavior of intensely competing plant populations, the distribution of individual heights did not become more left-skewed with time for any species, regardless of plot density; i.e., excesses of short, suppressed individuals did not accumulate in high-density plots. We further measured the overlap of zones of influence (ZOIs) to assess the potential for resource competition. Seedling ZOIs overlapped only slightly in extremely dense monodominant plots, and even less in ambient-density plots of mixed composition. Our results thus suggest that interseedling competition was weak. Given the low density of tree seedlings in Neotropical forests, we infer that resource competition among seedlings may be irrelevant to their recruitment. |
| Address |
[Paine, C. E. Timothy; Harms, Kyle E.] Louisiana State Univ, Dept Biol Sci, Baton Rouge, LA 70803 USA, Email: cetpaine@gmail.com |
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| Publisher |
BLACKWELL PUBLISHING |
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Summary Language |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0006-3606 |
ISBN |
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| Notes |
ISI:000257717500006 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
134 |
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| Author |
Herault, B.; Thoen, D. |
| Title |
Diversity of plant assemblages in isolated depressional wetlands from Central-Western Europe |
Type |
Journal Article |
| Year |
2008 |
Publication |
Biodiversity and Conservation |
Abbreviated Journal |
Biodivers. Conserv. |
| Volume |
17 |
Issue |
9 |
Pages |
2169-2183 |
| Keywords |
closed depressions; connectivity; fens; forest; grassland; habitat area; landscape matrix |
| Abstract |
A closed depression is defined as a geomorphologic element where a sediment depository is encircled by hillslopes. Despite the fact that closed depressions are often the only stagnant water points in many European landscapes, few ecological researches on their plant assemblages have been done. The main goal of this study was to give first results of the environmental factors responsible for the vegetation composition, richness and rarity in the closed depressions of the Lorraine biogeographical district (Belgium, France and grand-duche de Luxembourg). We surveyed for plant presence 85 forest and 77 grassland closed depressions. For each site, wetland area, local environmental factors and regional connectivities registered. For each species, the Ellenberg values were compiled. To investigate the main source of variation in species composition and in species richness (including richness in rare species), Non-metric Multidimensional Scaling analyses and Generalized Linear Models were respectively used. Species pools in forest (forest and preforest species) and in grassland (bog plants, pioneers, helophytes) were quite different. In both landscapes, a gradient from plants typical of basic high-productive soils to plants typical of acid low-productive soils reflects a shared successional gradient. The accumulation of organic matter allowed the establishment of Sphagnum spp., which slowly acidified the soil and thus acted as ecosystem engineers for the arrival of bog plants. Moreover, the species composition was additionally driven by the plant light tolerance in forests and by the plant water requirements in grasslands. Mechanisms of species accumulation (increase in species richness) were different in forests and in grasslands: respectively related to the plant light tolerance and to the wetland area. At the regional level, the averaged soil productivity was negatively related to the richness in rare species. Indeed, perennial highly-competitive plants such as Glyceria spp., Iris pseudacorus or Urtica dioica impeded the establishment of smaller and rarer species. At the habitat level, isolated closed depressions (due to either low connectivity or low grazing pressure) have more habitat rare species, giving evidences of dispersal limitation in plant assemblages of closed depressions. |
| Address |
[Herault, Bruno] Inst Bot, Ctr Ecol Vegetale & Hydrol, F-67083 Strasbourg, France, Email: bruno.herault@cirad.fr |
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SPRINGER |
Place of Publication |
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Edition |
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| ISSN |
0960-3115 |
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| Notes |
ISI:000257486400008 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
135 |
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| Author |
Christensen-Dalsgaard, K.K.; Ennos, A.R.; Fournier, M. |
| Title |
Are radial changes in vascular anatomy mechanically induced or an ageing process? Evidence from observations on buttressed tree root systems |
Type |
Journal Article |
| Year |
2008 |
Publication |
Trees-Structure and Function |
Abbreviated Journal |
Trees-Struct. Funct. |
| Volume |
22 |
Issue |
4 |
Pages |
543-550 |
| Keywords |
wood; anatomy; mechanical loading; tree development; vessels |
| Abstract |
To investigate the effect of changes in mechanical loading conditions on radial anatomical patterns, we here compare the trunk with the roots in two locations of three species of buttressed trees. The proximal part of the buttress roots is highly mechanically loaded throughout juvenile growth whereas the distal part of the buttresses is though to be mechanically unimportant at formation but become progressively more mechanically loaded during growth. We measured the frequency and diameter of the vessels and the vessel area fraction, and from this calculated the specific conductivity of tissue samples of the core-, intermediate- and outer wood. As in previous studies there was an increase in vessel size, vessel area fraction and specific conductivity from the pith to the bark in the trunk. In the proximal part of the buttress roots, however, there was no increase in vessel size and conductivity from core wood and out in agreement with the high mechanical loading found here throughout growth. There was instead a decrease in vessel size, vessel area fraction and specific conductivity from core- to outer wood in the distal part of the buttress roots in accordance with the increase in mechanical loading. Hence, it appears that the radial anatomical patterns are not a passive function of cambial ageing but may be modified in response to local mechanical loading. |
| Address |
[Christensen-Dalsgaard, Karen K.] Univ Alberta, Edmonton, AB T6G 2E3, Canada, Email: kkchrist@ualberta.ca |
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SPRINGER |
Place of Publication |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0931-1890 |
ISBN |
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Medium |
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Conference |
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| Notes |
ISI:000257385200014 |
Approved |
no |
| Call Number |
EcoFoG @ eric.marcon @ |
Serial |
136 |
| Permanent link to this record |
