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| Author | Baraloto, C.; Herault, B.; Paine, C.E.T.; Massot, H.; Blanc, L.; Bonal, D.; Molino, J.-F.; Nicolini, E.A.; Sabatier, D. | ||||
| Title | Contrasting taxonomic and functional responses of a tropical tree community to selective logging | Type | Journal Article | ||
| Year | 2012 | Publication | Journal of Applied Ecology | Abbreviated Journal | J. Appl. Ecol. |
| Volume | 49 | Issue | 4 | Pages  |
861-870 |
| Keywords | Canopy gap dynamics; Disturbance; French Guiana; Functional diversity; Functional evenness; Functional traits; Light partitioning; Species richness; Tropical rain forest | ||||
| Abstract | 1.Considerable debate surrounds the extent to which tropical forests can be managed for resource extraction while conserving biodiversity and ecosystem properties, which depend on functional composition. Here we evaluate the compatibility of these aims by examining the effects of logging on taxonomic and functional diversity and composition in a tropical forest. 2.Twenty years after selective logging, we inventoried 4140 stems regenerating in logging gaps and adjacent undisturbed areas, and we integrated a database of 13 functional traits describing leaf and wood economics of tropical trees. 3.We found no differences in taxonomic and functional richness among habitats, but logging gaps had significantly higher taxonomic and functional evenness. 4.Logging also effected striking, long-term changes in both species and functional composition. In particular, the xylem density of recruits in logging gaps was 6% less than in unlogged forests, leaves were 11% less tough and had 6-13% greater mineral nutrient concentrations. 5.Synthesis and applications. Our results suggest that managers of tropical forests should limit overall surface area converted to logging gaps by creating fewer, larger gaps during selective logging, to reduce impacts on the taxonomic and functional composition of the regenerating stand. Our results suggest that managers of tropical forests should limit overall surface area converted to logging gaps by creating fewer, larger gaps during selective logging, to reduce impacts on the taxonomic and functional composition of the regenerating stand. © 2012 The Authors. Journal of Applied Ecology © 2012 British Ecological Society. | ||||
| Address | CIRAD-ES, Research Unit 'Biens et Services des Ecosystémes Forestiers tropicaux', Embrapa Amazonia Oriental, Caixa Postal, 48, Belem, Para – CEP 66095-100, Brazil | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 00218901 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 30 July 2012; Source: Scopus; Coden: Japea; doi: 10.1111/j.1365-2664.2012.02164.x; Language of Original Document: English; Correspondence Address: Baraloto, C.; INRA, UMR 'Ecologie des Forêts de Guyane', 97387 Kourou Cedex, French Guiana; email: chris.baraloto@ecofog.gf | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 410 | ||
| Permanent link to this record | |||||
| Author | Lebrini, M.; Robert, F.; Roos, C. | ||||
| Title | Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium | Type | Journal Article | ||
| Year | 2011 | Publication | International Journal of Electrochemical Science | Abbreviated Journal | Int. J. Electrochem. Sci. |
| Volume | 6 | Issue | 3 | Pages |
847-859 |
| Keywords | Palicourea guianensis; corrosion inhibitors; C38 steel; acidic media; adsorption | ||||
| Abstract | Corrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 tell in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 degrees C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm. | ||||
| Address | [Lebrini, M.; Robert, F.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr | ||||
| Corporate Author | Thesis | ||||
| Publisher | Electrochemical Science Group | Place of Publication | Editor | ||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1452-3981 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000287820500026 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 298 | ||
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| Author | Herault, B.; Ouallet, J.; Blanc, L.; Wagner, F.; Baraloto, C. | ||||
| Title | Growth responses of neotropical trees to logging gaps | Type | Journal Article | ||
| Year | 2010 | Publication | Journal of Applied Ecology | Abbreviated Journal | J. Appl. Ecol. |
| Volume | 47 | Issue | 4 | Pages |
821-831 |
| Keywords | canopy openings; functional traits; incidence function model; light partitioning; selective logging; tree growth rates; tropical rain forest | ||||
| Abstract | P>1. Modelling growth strategies among tropical trees is an important objective in predicting the response of tree dynamics to selective logging and in gaining insights into the ecological processes that structure tree communities in managed tropical forests. 2. We developed a disturbance index to model the effects of distance to and area of logging gaps on stem radial growth rates. This index was tested using census data of 43 neotropical tree species, representing a variety of life-history strategies and developmental stages, from a selectively logged forest at Paracou, French Guiana. Growth strategies were analyzed in light of two indicators: the inherent species growth rate (when disturbance index is null) and the species reaction (change in growth rate) to logging gaps. 3. Across species, the predicted inherent growth rates in unlogged forest ranged from 0 center dot 25 to 6 center dot 47 mm year-1, with an average growth of 2 center dot 29 mm year-1. Ontogenetic shifts in inherent growth rate were found in 26 of the 43 species. 4. Species growth response to logging gaps varied widely among species but was significantly positive for 27 species. The effect of ontogeny on growth response to logging was retained for 14 species, and species with inherent fast growth rate (5 mm year-1) responded less to logging gap disturbances than did species with slow inherent growth (1 mm year-1). 5. Functional traits explained 19-42% of the variation in the inherent growth rate and in species' response across all developmental stages. Whereas maximum diameters and seed mass were strong predictors of inherent growth rate, maximum height, wood density, mode of germination and stem architecture were additionally involved in tree growth response. 6. Synthesis and applications: This study provides a necessary framework for developing predictive post-logging growth models for the thousands of species comprising tropical forests and is sufficiently general to apply to a broad range of managed tropical forests. | ||||
| Address | [Herault, Bruno] Univ Antilles Guyane, UMR Ecol Forets Guyane, F-97387 Kourou, France, Email: bruno.herault@ecofog.gf | ||||
| Corporate Author | Thesis | ||||
| Publisher | WILEY-BLACKWELL PUBLISHING, INC | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0021-8901 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000279405100012 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 53 | ||
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| Author | Brouard, O.; Céréghino, R.; Corbara, B.; Leroy, C.; Pelozuelo, L.; Dejean, A.; Carrias, J.-F. | ||||
| Title | Understorey environments influence functional diversity in tank-bromeliad ecosystems | Type | Journal Article | ||
| Year | 2012 | Publication | Freshwater Biology | Abbreviated Journal | Freshw. Biol. |
| Volume | 57 | Issue | 4 | Pages |
815-823 |
| Keywords | Food webs; French Guiana; Invertebrates; Microorganisms; Phytotelmata; Rainforest | ||||
| Abstract | A substantial fraction of the freshwater available in neotropical forests is impounded within the rosettes of bromeliads that form aquatic islands in a terrestrial matrix. The ecosystem functioning of bromeliads is known to be influenced by the composition of the contained community but it is not clear whether bromeliad food webs remain functionally similar against a background of variation in the understorey environment. We considered a broad range of environmental conditions, including incident light and incoming litter, and quantified the distribution of a very wide range of freshwater organisms (from viruses to macroinvertebrates) to determine the factors that influence the functional structure of bromeliad food webs in samples taken from 171 tank-bromeliads. We observed a gradient of detritus-based to algal-based food webs from the understorey to the overstorey. Algae, rotifers and collector and predatory invertebrates dominated bromeliad food webs in exposed areas, whereas filter-feeding insects had their highest densities in shaded forest areas. Viruses, bacteria and fungi showed no clear density patterns. Detritus decomposition is mainly due to microbial activity in understorey bromeliads where filter feeders are the main consumers of microbial and particulate organic matter (POM). Algal biomass may exceed bacterial biomass in sun-exposed bromeliads where amounts of detritus were lower but functional diversity was highest. Our results provide evidence that tank-bromeliads, which grow in a broad range of ecological conditions, promote aquatic food web diversity in neotropical forests. Moreover, although bromeliad ecosystems have been categorised as detritus-based systems in the literature, we show that algal production can support a non-detrital food web in these systems. © 2012 Blackwell Publishing Ltd. | ||||
| Address | Ecologie des Forêts de Guyane, UMR, CNRS 8172, Campus Agronomique, 97379 Kourou Cedex, France | ||||
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| ISSN | 00465070 (Issn) | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Export Date: 21 March 2012; Source: Scopus; Coden: Fwbla; doi: 10.1111/j.1365-2427.2012.02749.x; Language of Original Document: English; Correspondence Address: Céréghino, R.; INP, UPS EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), Université de Toulouse, 118 Route de Narbonne, 31062 Toulouse, France; email: regis.cereghino@univ-tlse3.fr | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 383 | ||
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| Author | Aimene, Y.; Dorville, R.; Omrane, A. | ||||
| Title | Optimal control for trees trunk diameter estimation in rain forest ecology | Type | Journal Article | ||
| Year | 2013 | Publication | Applied Mathematical Sciences | Abbreviated Journal | |
| Volume | 7 | Issue | 17-20 | Pages |
807-816 |
| Keywords | Missing data; Optimal control; Tree trunk diameter | ||||
| Abstract | We study the optimal control question for an important mechanical problem related to tree trunk diameter variation in tropical forest ecology where some data are missing. Within a cost function, the control problem is formulated with a mechanical model that requires boundary conditions tosolve all equations. We give a characterization of the optimal measurement function for the tree trunk problem. | ||||
| Address | Laboratoire CEREGMIA EA 2440, Université Antilles-Guyane, I.E.S.G Campus de Trou-Biran, Route de Baduel, 97337 Cayenne, French Guiana | ||||
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| Notes | Export Date: 21 February 2013; Source: Scopus | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 469 | ||
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| 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 | ||||
| Corporate Author | Thesis | ||||
| Publisher | EDP SCIENCES S A | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1286-4560 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | ISI:000261431600006 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 127 | ||
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| Author | Sist, P.; Picard, N.; Gourlet-Fleury, S. | ||||
| Title | Sustainable cutting cycle and yields in a lowland mixed dipterocarp forest of Borneo | Type | Journal Article | ||
| Year | 2003 | Publication | Annals of Forest Science | Abbreviated Journal | Ann. For. Sci. |
| Volume | 60 | Issue | 8 | Pages |
803-814 |
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| Abstract | Based on a 6 year monitoring of the dynamics of a mixed dipterocarp forest in East Borneo (1990-1996), we built a matrix model to predict the sustainable cutting cycle in relation with the extraction and damage rates. Plots were ordered according to three main groups of damage and logging intensity. The first group G1 gathered slightly damaged plots with a remaining basal area greater than or equal to80% of the original (mean logging intensity = 6 trees ha(-1)). Plots belonging to G2, had a remaining basal area varying between 70 and 79% of the original one (mean logging intensity = 8 trees ha(-1)). Finally, G3 gathers highly damaged plots with a remaining basal area < 70% of the original one and a high logging intensity (mean = 14 trees ha(-1)). The mean sustainable cutting cycles predicted in the three groups were significantly different and equal 27, 41 and 89 years in G1, G2 and G3 respectively. However, the respective mean annual extracted volumes were similar: 1.6, 1.8 and 1.4 m(3) ha(-1) year(-1), respectively in G1, G2 and G3. The model suggests that a 40 year cycle, extracting 8 trees ha(-1) (60 m(3) ha(-1)) and an annual volume of 1.5 m(3) ha(-1) year(-1) is the best option to preserve ecological integrity of the forest, to ensure yield sustainability and, according to existing cost analysis, economic profitability. This result is also consistent with other studies which already demonstrated that logging damage reduction using RIL techniques could be only significant with a moderate felling intensity not exceeding 8 trees ha(-1). This felling intensity threshold can be easily achieved by applying simple harvesting rules. | ||||
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| ISSN | 1286-4560 | ISBN | Medium | ||
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| Notes | WOS:000221039000007 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 310 | ||
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| Author | Scotti, I. | ||||
| Title | Adaptive potential in forest tree populations: what is it, and how can we measure it? | Type | Journal Article | ||
| Year | 2010 | Publication | Annals of Forest Science | Abbreviated Journal | Ann. For. Sci. |
| Volume | 67 | Issue | 8 | Pages |
801 |
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| Address | INRA, Unite Mixte Rech Ecol Forets Guyane EcoFoG, F-97387 Kourou, France, Email: ivan.scotti@ecofog.gf | ||||
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| Publisher | EDP SCIENCES S A | Place of Publication | Editor | ||
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| ISSN | 1286-4560 | ISBN | Medium | ||
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| Notes | ISI:000283594400002 | Approved | no | ||
| Call Number | EcoFoG @ eric.marcon @ | Serial | 21 | ||
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| Author | Clair, B.; Alteyrac, J.; Gronvold, A.; Espejo, J.; Chanson, B.; Alméras, T. | ||||
| Title | Patterns of longitudinal and tangential maturation stresses in Eucalyptus nitens plantation trees | Type | Journal Article | ||
| Year | 2013 | Publication | Annals of Forest Science | Abbreviated Journal | Ann. Forest Sci. |
| Volume | 70 | Issue | 8 | Pages |
801-811 |
| Keywords | Eucalyptus nitens; G-layer; Longitudinal maturation stress; Maturation strain; Tangential maturation stress; Tension wood | ||||
| Abstract | Context: Tree orientation is controlled by asymmetric mechanical stresses set during wood maturation. The magnitude of maturation stress differs between longitudinal and tangential directions, and between normal and tension woods. Aims: We aimed at evaluating patterns of maturation stress on eucalypt plantation trees and their relation with growth, with a focus on tangential stress evaluation. Methods: Released maturation strains along longitudinal and tangential directions were measured around the circumference of 29 Eucalyptus nitens trees, including both straight and leaning trees. Results: Most trees produced asymmetric patterns of longitudinal maturation strain, but more than half of the maturation strain variability occurred between trees. Many trees produced high longitudinal tensile stress all around their circumference. High longitudinal tensile stress was not systematically associated with the presence of gelatinous layer. The average magnitude of released longitudinal maturation strain was found negatively correlated to the growth rate. A methodology is proposed to ensure reliable evaluation of released maturation strain in both longitudinal and tangential directions. Tangential strain evaluated with this method was lower than previously reported. Conclusion: The stress was always tensile along the longitudinal direction and compressive along the tangential direction, and their respective magnitude was positively correlated. This correlation does not result from a Poisson effect but may be related to the mechanism of maturation stress generation. © 2013 # The Author(s) 2013. This article is published with open access at Springerlink.com. | ||||
| Address | Facultad de Ciencias Forestales, Universidad de Concepcion, Ciudad Universitaria, Concepcion, Chile | ||||
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| ISSN | 12864560 (Issn) | ISBN | Medium | ||
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| Notes | Export Date: 16 December 2013; Source: Scopus; Coden: Afosf; doi: 10.1007/s13595-013-0318-4; Language of Original Document: English; Correspondence Address: Clair, B.; CNRS, UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 701, 97387 Kourou, French Guiana; email: bruno.clair@univ-montp2.fr; Funding Details: ANR-12-BS09-0004, French National Research Agency; References: Alméras, T., Fournier, M., Biomechanical design and long-term stability of trees: Morphological and wood traits involved in the balance between weight increase and the gravitropic reaction (2009) J Theor Biol, 256, pp. 370-381. , 19013473 10.1016/j.jtbi.2008.10.011; Alméras, T., Thibaut, A., Gril, J., Effect of circumferential heterogeneity of wood maturation strain, modulus of elasticity and radial growth on the regulation of stem orientation in trees (2005) Trees, 19, pp. 457-467. , 10.1007/s00468-005-0407-6; Archer, R.R., (1986) Growth Stresses and Strains in Trees, , Springer Verlag Berlin/Heidelberg/New York; Archer, R.R., On the origin of growth stresses in trees. 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| Call Number | EcoFoG @ webmaster @ | Serial | 519 | ||
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| Author | Turcotte, M.M.; Thomsen, C.J.M.; Broadhead, G.T.; Fine, P.V.A.; Godfrey, R.M.; Lamarre, G.P.A.; Meyer, S.T.; Richards, L.A.; Johnson, M.T.J. | ||||
| Title | Percentage leaf herbivory across vascular plant species | Type | Journal Article | ||
| Year | 2014 | Publication | Ecology | Abbreviated Journal | Ecology |
| Volume | 95 | Issue | 3 | Pages |
788-788 |
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| Abstract | Herbivory is viewed as a major driver of plant evolution and the most important energy pathway from plants to higher trophic levels. Therefore, understanding patterns of herbivory on plants remains a key focus in evolution and ecology. The evolutionary impacts of leaf herbivory include altering plant fitness, local adaptation, the evolution of defenses, and the diversification of plants as well as natural enemies. Leaf herbivory also impacts ecological processes such as plant productivity, community composition, and ecosystem nutrient cycling. Understanding the impact of herbivory on these ecological and evolutionary processes requires species-specific, as opposed to community-level, measures of herbivory. In addition, species-specific data enables the use of modern comparative methods to account for phylogenetic non-independence. Although hundreds of studies have measured natural rates of leaf consumption, we are unaware of any accessible compilation of these data. We created such a data set to provide the raw data needed to test general hypotheses relating to plant?herbivore interactions and to test the influence of biotic and abiotic factors on herbivory rates across large spatial scales. A large repository will make this endeavor more efficient and robust. In total, we compiled 2641 population-level measures for either annual or daily rates of leaf herbivory across 1145 species of vascular plants collected from 189 studies. All damage measures represent natural occurrences of herbivory that span numerous angiosperm, gymnosperm, and fern species. To enable researchers to explore the causes of variation in herbivory and how these might interact, we added information about the study sites including: geolocation, climate classification, habitat descriptions (e.g., seashore, grassland, forest, agricultural fields), and plant trait information concerning growth form and duration (e.g., annual vs. perennial). We also included extensive details of the methodology used to measure leaf damage, including seasons and months of sampling, age of leaves, and the method used to estimate percentage area missing. We anticipate that these data will make it possible to test important hypotheses in the plant?herbivore literature, including the plant apparency hypothesis, the latitudinal-herbivory defense hypothesis, the resource availability hypothesis, and the macroevolutionary escalation of defense hypothesis. | ||||
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| Publisher | Ecological Society of America | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
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| ISSN | 0012-9658 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | doi: 10.1890/13-1741.1 | Approved | no | ||
| Call Number | EcoFoG @ webmaster @ | Serial | 575 | ||
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