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Author  |
Groc, S.; Delabie, J.H.C.; Fernandez, F.; Petitclerc, F.; Corbara, B.; Leponce, M.; Céréghino, R.; Dejean, A. |
| Title |
Litter-dwelling ants as bioindicators to gauge the sustainability of small arboreal monocultures embedded in the Amazonian rainforest |
Type |
Journal Article |
| Year |
2017 |
Publication |
Ecological Indicators |
Abbreviated Journal |
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| Volume |
82 |
Issue |
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Pages |
43-49 |
| Keywords |
Ant diversity; Community alteration; Forest species; Functional traits; Human disturbance; Tree monocultures |
| Abstract |
One of the greatest threats to biodiversity and the sustainable functioning of ecosystems is the clearing of forests for agriculture. Because litter-dwelling ants are very good bioindicators of man-made disturbance, we used them to compare monospecific plantations of acacia trees, cocoa trees, rubber trees and pine trees with the surrounding Neotropical rainforest (in contrast to previous studies on forest fragments embedded in industrial monocultures). Although the global level of species turnover was weak, species richness decreased along a gradient from the forest (including a treefall gap) to the tree plantations among which the highest number of species was noted for the cocoa trees, which are known to be a good compromise between agriculture and conservation. Species composition was significantly different between natural habitats and the plantations that, in turn, were different from each other. Compared to the forest, alterations in the ant communities were (1) highest for the acacia and rubber trees, (2) intermediate for the cocoa trees, and, (3) surprisingly, far lower for the pine trees, likely due to very abundant litter. Functional traits only separated the rubber tree plantation from the other habitats due to the higher presence of exotic and leaf-cutting ants. This study shows that small monospecific stands are likely sustainable when embedded in the rainforest and that environmentally-friendly strategies can be planned accordingly. © 2017 Elsevier Ltd |
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Ecolab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France |
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Export Date: 9 July 2017 |
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EcoFoG @ webmaster @ |
Serial |
758 |
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Groc, S.; Delabie, J.H.C.; Cereghino, R.; Orivel, J.; Jaladeau, F.; Grangier, J.; Mariano, C.S.F.; Dejean, A. |
| Title |
Ant species diversity in the 'Grands Causses' (Aveyron, France): In search of sampling methods adapted to temperate climates RID C-4034-2011 |
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Journal Article |
| Year |
2007 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
| Volume |
330 |
Issue |
12 |
Pages |
913-922 |
| Keywords |
ant diversity; Grands Causses; sampling methods; temperate climate |
| Abstract |
This study aimed at showing the applicability of using a combination of four sampling methods (i.e., Winkler extractors, pitfall traps, baiting and manual collection), something most often conducted in the tropics, to create an inventory of ant species diversity in temperate environments. We recorded a total of 33 ant species in the Grands Causses by comparing three vegetal formations: a steppic lawn ('causse' sensu stricto), which was the most species-rich (29 species), followed by an oak grove (22 species) and a pine forest (17 species). No sampling method alone is efficient enough to provide an adequate sampling, but their combination permits one to make a suitable inventory of the myrmecofauna and to obtain information on the ecology of these ant species. |
| Address |
[Groc, S; Orivel, J; Grangier, J; Dejean, A] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse, France, Email: alain.dejean@wanadoo.fr |
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Elsevier France-Editions Scientifiques Medicales Elsevier |
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English |
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1631-0691 |
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WOS:000251852800009 |
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EcoFoG @ webmaster @ |
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359 |
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Grau, O.; Peñuelas, J.; Ferry, B.; Freycon, V.; Blanc, L.; Desprez, M.; Baraloto, C.; Chave, J.; Descroix, L.; Dourdain, A.; Guitet, S.; Janssens, I.A.; Sardans, J.; Herault, B. |
| Title |
Nutrient-cycling mechanisms other than the direct absorption from soil may control forest structure and dynamics in poor Amazonian soils |
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Journal Article |
| Year |
2017 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
| Volume |
7 |
Issue |
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Pages |
45017 |
| Keywords |
biomass; forest structure; French Guiana; mortality; nutrient availability; nutrient content; nutrient cycling; nutrient uptake; productivity; soil; storage; tropical rain forest |
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Tropical forests store large amounts of biomass despite they generally grow in nutrient-poor soils, suggesting that the role of soil characteristics in the structure and dynamics of tropical forests is complex. We used data for >34 000 trees from several permanent plots in French Guiana to investigate if soil characteristics could predict the structure (tree diameter, density and aboveground biomass), and dynamics (growth, mortality, aboveground wood productivity) of nutrient-poor tropical forests. Most variables did not covary with site-level changes in soil nutrient content, indicating that nutrient-cycling mechanisms other than the direct absorption from soil (e.g. the nutrient uptake from litter, the resorption, or the storage of nutrients in the biomass), may strongly control forest structure and dynamics. Ecosystem-level adaptations to low soil nutrient availability and long-term low levels of disturbance may help to account for the lower productivity and higher accumulation of biomass in nutrient-poor forests compared to nutrient-richer forests. |
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Export Date: 8 April 2017 |
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EcoFoG @ webmaster @ |
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748 |
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Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A. |
| Title |
Low intraspecific aggressiveness in two obligate plant-ant species |
Type |
Journal Article |
| Year |
2008 |
Publication |
Insectes Sociaux |
Abbreviated Journal |
Insect. Soc. |
| Volume |
55 |
Issue |
3 |
Pages |
238-240 |
| Keywords |
aggressiveness; Allomerus; myrmecophytes; plant-ants; recognition ability |
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Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiveness is very low whatever the distance separating the tested nests, while interspecific conflicts are always violent. Similar patterns of aggressiveness have been reported in various ant species, but the strictly arboreal life of Allomerus ants associated with the isolation of their adult colonies highlight different ecological conditions that might explain the lack of aggressiveness between conspecifics. |
| Address |
[Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A.] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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BIRKHAUSER VERLAG AG |
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0020-1812 |
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ISI:000258959300004 |
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no |
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EcoFoG @ eric.marcon @ |
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208 |
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Grangier, J.; Dejean, A.; Male, P.J.G.; Solano, P.J.; Orivel, J. |
| Title |
Mechanisms driving the specificity of a myrmecophyte-ant association |
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Journal Article |
| Year |
2009 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
| Volume |
97 |
Issue |
1 |
Pages |
90-97 |
| Keywords |
Allomerus decemarticulatus; exclusion filters; Hirtella physophora; horizontal transmission; host recognition; mutualism |
| Abstract |
In the understory of pristine Guianese forests, the myrmecophyte Hirtella physophora almost exclusively shelters colonies of the plant-ant Allomerus decemarticulatus in its leaf pouches. We experimentally tested three non-mutually exclusive hypotheses concerning phenomena that can determine the species specificity of this association throughout the foundation stage of the colonies: (1) interspecific competition results in the overwhelming presence of A. decemarticulatus queens or incipient colonies; (2) exclusion filters prevent other ant species from entering the leaf pouches; and (3) host-recognition influences the choice of founding queens, especially A. decemarticulatus. Neither interspecific competition, nor the purported exclusion filters that we examined play a major role in maintaining the specificity of this association. Unexpectedly, the plant trichomes lining the domatia appear to serve as construction material during claustral foundation rather than as a filter. Finally, A. decemarticulatus queens are able to identify their host plant from a distance through chemical and/or visual cues, which is rarely demonstrated in studies on obligatory ant-plant associations. We discuss the possibility that this specific host-recognition ability could participate in shaping a compartmentalized plant-ant community where direct competition between ant symbionts is limited. (C) 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 97, 90-97. |
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[Grangier, Julien; Male, Pierre-Jean G.; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Divers Biol, CNRS, UMR 5174, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0024-4066 |
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ISI:000265406800008 |
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no |
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EcoFoG @ eric.marcon @ |
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114 |
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Grangier, J.; Dejean, A.; Male, P.J.G.; Orivel, J. |
| Title |
Indirect defense in a highly specific ant-plant mutualism |
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Journal Article |
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2008 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
| Volume |
95 |
Issue |
10 |
Pages |
909-916 |
| Keywords |
Allomerus decemarticulatus; Hirtella physophora; indirect defense; myrmecophytes; optimal defense theory |
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Although associations between myrmecophytes and their plant ants are recognized as a particularly effective form of protective mutualism, their functioning remains incompletely understood. This field study examined the ant-plant Hirtella physophora and its obligate ant associate Allomerus decemarticulatus. We formulated two hypotheses on the highly specific nature of this association: (1) Ant presence should be correlated with a marked reduction in the amount of herbivory on the plant foliage; (2) ant activity should be consistent with the “optimal defense” theory predicting that the most vulnerable and valuable parts of the plant are the best defended. We validated the first hypothesis by demonstrating that for ant-excluded plants, expanding leaves, but also newly matured ones in the long term, suffered significantly more herbivore damage than ant-inhabited plants. We showed that A. decemarticulatus workers represent both constitutive and inducible defenses for their host, by patrolling its foliage and rapidly recruiting nestmates to foliar wounds. On examining how these activities change according to the leaves' developmental stage, we found that the number of patrolling ants dramatically decreased as the leaves matured, while leaf wounds induced ant recruitment regardless of the leaf's age. The resulting level of these indirect defenses was roughly proportional to leaf vulnerability and value during its development, thus validating our second hypothesis predicting optimal protection. This led us to discuss the factors influencing ant activity on the plant's surface. Our study emphasizes the importance of studying both the constitutive and inducible components of indirect defense when evaluating its efficacy and optimality. |
| Address |
[Grangier, Julien; Dejean, Alain; Male, Pierre-Jean G.; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Diversite Biol, CNRS, UMR 5174, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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SPRINGER |
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0028-1042 |
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ISI:000259737600002 |
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EcoFoG @ eric.marcon @ |
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207 |
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Grabchak, M.; Marcon, E.; Lang, G.; Zhang, Z. |
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The generalized Simpson’s entropy is a measure of biodiversity |
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Journal Article |
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2017 |
Publication |
Plos One |
Abbreviated Journal |
Plos One |
| Volume |
12 |
Issue |
3 |
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e0173305 |
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Modern measures of diversity satisfy reasonable axioms, are parameterized to produce diversity profiles, can be expressed as an effective number of species to simplify their interpretation, and come with estimators that allow one to apply them to real-world data. We introduce the generalized Simpson’s entropy as a measure of diversity and investigate its properties. We show that it has many useful features and can be used as a measure of biodiversity. Moreover, unlike most commonly used diversity indices, it has unbiased estimators, which allow for sound estimation of the diversity of poorly sampled, rich communities. |
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Public Library of Science |
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EcoFoG @ webmaster @ |
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742 |
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Gourlet-Fleury, S.; Rossi, V.; Rejou-Mechain, M.; Freycon, V.; Fayolle, A.; Saint-André, L.; Cornu, G.; Gérard, J.; Sarrailh, J.-M.; Flores, O.; Baya, F.; Billand, A.; Fauvet, N.; Gally, M.; Henry, M.; Hubert, D.; Pasquier, A.; Picard, N. |
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Environmental filtering of dense-wooded species controls above-ground biomass stored in African moist forests |
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Journal Article |
| Year |
2011 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
| Volume |
99 |
Issue |
4 |
Pages |
981-990 |
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Basal area; Central African Republic; Determinants of plant community diversity and structure; Life-history strategy; Soil fertility; Species sorting; Vital rates; Water reserve; Wood density; aboveground biomass; basal area; climate change; data set; database; diameter; forest ecosystem; forest inventory; life history trait; nutrient availability; physical property; plant community; resource availability; soil fertility; soil nutrient; soil texture; soil type; stem; tropical forest; wood; Central African Republic |
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1.Regional above-ground biomass estimates for tropical moist forests remain highly inaccurate mostly because they are based on extrapolations from a few plots scattered across a limited range of soils and other environmental conditions. When such conditions impact biomass, the estimation is biased. The effect of soil types on biomass has especially yielded controversial results. 2.We investigated the relationship between above-ground biomass and soil type in undisturbed moist forests in the Central African Republic. We tested the effects of soil texture, as a surrogate for soil resources availability and physical constraints (soil depth and hydromorphy) on biomass. Forest inventory data were collected for trees ≥20cm stem diameter in 2754 0.5ha plots scattered over 4888km2. The plots contained 224 taxons, of which 209 were identified to species. Soil types were characterized from a 1:1000000 scale soil map. Species-specific values for wood density were extracted from the CIRAD's data base of wood technological properties. 3.We found that basal area and biomass differ in their responses to soil type, ranging from 17.8m2ha-1 (217.5tha-1) to 22.3m2ha-1 (273.3tha-1). While shallow and hydromorphic soils support forests with both low stem basal area and low biomass, forests on deep resource-poor soils are typically low in basal area but as high in biomass as forests on deep resource-rich soils. We demonstrated that the environmental filtering of slow growing dense-wooded species on resource-poor soils compensates for the low basal area, and we discuss whether this filtering effect is due to low fertility or to low water reserve. 4.Synthesis. We showed that soil physical conditions constrained the amount of biomass stored in tropical moist forests. Contrary to previous reports, our results suggest that biomass is similar on resource-poor and resource-rich soils. This finding highlights both the importance of taking into account soil characteristics and species wood density when trying to predict regional patterns of biomass. Our findings have implications for the evaluation of biomass stocks in tropical forests, in the context of the international negotiations on climate change. © 2011 The Authors. Journal of Ecology © 2011 British Ecological Society. |
| Address |
CIRAD, BP 4035, Libreville, Gabon |
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Cited By (since 1996): 1; Export Date: 23 October 2011; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2011.01829.x; Language of Original Document: English; Correspondence Address: Gourlet-Fleury, S.; Cirad, UR BandSEF, Biens et Services des Ecosystèmes Forestiers tropicaux, Campus International de Baillarguet, TA C-105/D, F-34398, Montpellier, France; email: sylvie.gourlet-fleury@cirad.fr |
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361 |
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Gourlet-Fleury, S.; Gazull, L.; Bigombe Logo, P.; Billand, A.; Bolaluembe, P.-C.; Boyemba, F.; Dessard, H.; Doucet, J.-L.; Doumenge, C.; Dubiez, E.; Durrieu De Madron, L.; Feintrenie, L.; Fomete, T.; Garcia, C.; Gillet, J.-F.; Herault, B.; Karsenty, A.; Menga, P.; Ngoya Kessy, A.M.; Pietsch, S.; Putz, J.; Rossi, V.; Sayer, J.; Sist, P.; Zongang Ngongang, A.A. |
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Are logging concessions a threat to the peatlands in DRC? |
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Journal Article |
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2017 |
Publication |
Bois et Forets des Tropiques |
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334 |
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3-6 |
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Université du Maine, France |
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Export Date: 23 January 2018 |
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EcoFoG @ webmaster @ |
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788 |
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Gourlet-Fleury, S.; Comu, G.; Jesel, S.; Dessard, H.; Jourget, J.G.; Blanc, L.; Picard, N. |
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Using models to predict recovery and assess tree species vulnerability in logged tropical forests: A case study from French Guiana |
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Journal Article |
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2005 |
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Forest Ecology and Management |
Abbreviated Journal |
For. Ecol. Manage. |
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209 |
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1-2 |
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69-86 |
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matrix model; individual-based spatially explicit model; regeneration; recruitment; long-term population dynamics |
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A major challenge for forest managers is to define the optimal cutting cycle to ensure that the resource is sustained in the long term. Matrix models of forest dynamics allow time-projection of diameter-class distributions and thus assessment of the time needed, after logging, to recover a given part of the exploitable stock. They are easy to build and they only require, as input variables, the diameter structure of the population(s) under scope. However, such models are based on a coarse description of tree population dynamics and must be used with caution. In particular, as trees are only described from a diameter threshold (usually 10 cm dbh), recruitment of a new tree cannot be linked with the preceding generation since too much time elapsed between seed dispersal and the installation of a 10-cm recruit. This causes predictions of matrix models to be highly questionable in the long term when ingrowth to larger dbh classes greatly depends on the way recruitment has been modelled. We used a case study from French Guiana to test whether or not a simple matrix model is reliable enough to help forest managers choose between management alternatives. We focused on the major timber species Dicorynia guianensis Amshoff (Caesalpiniaceae) harvested under a selective cutting regime. We compared predictions of D. guianensis stock recovery in the short and long term provided by two models: StoMat, a non-regulated matrix model, and SELVA, a single-tree distance dependent model explicitly simulating the entire species life cycle. Both models were independently calibrated on data from Paracou permanent sample plots. We showed that: (i) the short-term recovery of the exploitable stock predicted by StoMat is reliable for a large range of disturbance conditions; (ii) recruitment implementation in StoMat does not influence projections until the third felling cycle; (iii) for shared initial stand conditions SELVA and StoMat give consistent mid- and long-term predictions: the simple recruitment model used into StoMat could efficiently summarise the regeneration processes of the species under low felling intensity. Our results indicate that the current felling regime used in French Guiana may not be sustainable on a long-term basis. In any case, no more than 60% of the initial stock would be recovered after logging. We conclude that simple models can provide as reliable predictions as more complicated ones. They may be sufficient to assess the recovery of a species' exploitable stock even in the long term, or at least assess the (un)sustainability of particular harvesting regimes. (c) 2005 Elsevier B.V. All rights reserved. |
| Address |
CIRAD, Dept Forets, F-34398 Montpellier 5, France, Email: sylvie.gourlet-fleury@cirad.fr |
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ELSEVIER SCIENCE BV |
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0378-1127 |
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ISI:000228504600007 |
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EcoFoG @ eric.marcon @ |
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257 |
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