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Ferry, B.; Bontemps, J.-D.; Blanc, L.; Baraloto, C. |
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Is climate a stronger driver of tree growth than disturbance? A comment on Toledo et al. (2011) |
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Journal Article |
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2012 |
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Journal of Ecology |
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J. Ecol. |
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100 |
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5 |
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1065-1068 |
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Basal area change; Bolivia; Climate; Disturbance; Logging; Plant-climate interactions; Tree growth; Tropical forest |
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1.A recent article published by Toledo (2011b) investigates the effects of spatial variations in climate and soil, and of logging disturbance, on tree and forest growth in Bolivia. It concludes that climate is the strongest driver of tree and forest growth and that climate change may therefore have large consequences for forest productivity and carbon sequestration. However, serious methodological and conceptual discrepancies have been found that challenge these conclusions. 2.Because of an errant coding of 'time after logging' in the regression analysis, and because floristic changes induced by logging could not be incorporated into the analysis, the effect of logging on the average diameter growth is likely to have been strongly underestimated. 3.Basal area growth was improperly calculated as basal area change, and it displayed surprisingly high values, even among unlogged plots. We hypothesize that either these plots may be actually located in secondary forests recovering from past logging, or measurement biases may have hampered the data set. 4.Regardless of climate-growth relationships established across these plots, any inference concerning the potential effects of climate change on forest growth would require a specific quantitative assessment. 5.Synthesis. It is critical to re-assess the relative weight of climate and logging disturbance as driving factors of tree and forest growth, and to find an explanation for the very high basal area increment reported among the unlogged plots. We provide specific recommendations for further analyses of this and similar data sets. © 2012 British Ecological Society. |
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INRA, UMR Ecologie des Forêts de Guyane, 97379 Kourou, French Guiana |
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Cited By (since 1996): 1; Export Date: 4 September 2012; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2011.01895.x; Language of Original Document: English; Correspondence Address: Ferry, B.; AgroParisTech, ENGREF-Nancy, UMR 1092, F-54000 Nancy, France; email: bruno.ferry@engref.agroparistech.fr |
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Laurans, M.; Martin, O.; Nicolini, E.; Vincent, G. |
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Functional traits and their plasticity predict tropical trees regeneration niche even among species with intermediate light requirements |
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Journal Article |
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2012 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
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100 |
Issue |
6 |
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1440-1452 |
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Canopy disturbance; Determinants of plant community diversity and structure; Growth rate; Irradiance; Leaf life span; Leaf mass per area; Niche differentiation; Phenotypic plasticity; Shade tolerance; Tropical moist forest |
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Niche differentiation is a key issue in the current debate on community assembly mechanisms. In highly diverse moist tropical forests, tree species sensitivity to canopy openness is thought to be a major axis in niche differentiation. In the past, the syndrome of traits driving the demographic trade-off involved in the niche-based theory of coexistence has always been established among species situated at the two extremities of the shade-tolerance gradient, even though most tropical tree species have intermediate light requirements. In addition, trait plasticity has seldom been linked to tropical tree species distribution along environmental gradients. This article examines covariations between leaf traits, whole-plant traits and niche parameters among 14 tree species with intermediate light requirements in French Guiana and across a range of canopy openness. Each functional trait measured under field conditions was characterized by a median value and a degree of plasticity expressed under contrasting light regimes. Niche differentiation was characterized in terms of spatial light gradient. We first examined covariations between functional traits then explored to what degree the median value and plasticity in functional traits could predict light niche characteristics at the sapling stage and the ontogenetic change in light availability estimated by adult stature. Leaf mass per area (LMA) was positively correlated with leaf life span (LLS); species with higher LMA and higher LLS displayed lower diameter growth rates (GRs) and lower responsiveness to canopy gap at both whole-plant and population levels. This proved that the relationships previously established over a broader range of species held true within the narrow range of the light requirements covered. Height GR plasticity accounted for 49% of the variation in light niche optimum. LMA plasticity, unlike LLS plasticity, was significantly correlated with light niche breadth and adult stature. Synthesis. This study demonstrates the relevance of considering the phenotypic plasticity in functional traits in community ecology, particularly for quantifying breadth of species distribution over environmental gradients. Our findings did not support Hubbell's hypothesis of functional equivalence and suggest that even a rather subtle variation in forest canopy disturbance promotes the coexistence of tropical tree species. © 2012 The Authors. Journal of Ecology © 2012 British Ecological Society. |
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UMR AMAP, IRD, TA A-51/PS2, Bd de la Lironde, France |
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Export Date: 7 November 2012; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2012.02007.x; Language of Original Document: English; Correspondence Address: Laurans, M.; UMR, AMAP, CIRAD TA A-51/PS1, Bd de la Lironde, 34398 Montpellier Cedex 5, France; email: laurans@cirad.fr |
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Fortunel, C.; Paine, C.E.T.; Fine, P.V.A.; Kraft, N.J.B.; Baraloto, C. |
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Environmental factors predict community functional composition in Amazonian forests |
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Journal Article |
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2014 |
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Journal of Ecology |
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J. Ecol. |
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102 |
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1 |
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145-155 |
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Amazonian landscape; Climatic and soil gradients; Determinants of plant community diversity and structure; Environmental filtering; Functional traits; Tree communities; Tropical forests |
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The consequences of biodiversity loss for ecosystem services largely depend on the functional identities of extirpated species. However, poor descriptions of spatial patterns of community functional composition across landscapes hamper accurate predictions, particularly in highly diverse tropical regions. Therefore, understanding how community functional composition varies across environmental gradients remains an important challenge. We sampled 15 functional traits in 800 Neotropical tree species across 13 forest plots representative of the broad climatic and soil gradients encompassed by three widespread lowland forest habitats (terra firme forests on clay-rich soils, seasonally flooded forests and white-sand forests) at opposite ends of Amazonia (Peru and French Guiana). We combined univariate and multivariate approaches to test the magnitude and predictability of environmental filtering on community leaf and wood functional composition. Directional shifts in community functional composition correlated with environmental changes across the 13 plots, with denser leaves, stems and roots in forests occurring in environments with limited water and soil-nutrient availability. Critically, these relationships allowed us to accurately predict the functional composition of 61 additional forest plots from environmental data alone. Synthesis. Environmental filtering consistently shapes the functional composition of highly diverse tropical forests at large scales across the terra firme, seasonally flooded and white-sand forests of lowland Amazonia. Environmental factors drive and allow the prediction of variation in community functional composition among habitat types in Amazonian forests. © 2013 British Ecological Society. |
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Department of Biology, University of Florida, Gainesville, FL, 32611, United States |
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Export Date: 31 December 2013; Source: Scopus; Coden: Jecoa; doi: 10.1111/1365-2745.12160; Language of Original Document: English; Correspondence Address: Fortunel, C.; INRA, UMR Ecologie des Forêts de Guyane, BP 709, Kourou Cedex, 97387, France; email: claire.fortunel@ecofog.gf; Funding Details: DEB-0743103/0743800, NSF, National Science Foundation; References: Agrawal, A.A., Fishbein, M., Plant defense syndromes (2006) Ecology, 87, pp. S132-S149; Anderson, L.O., Malhi, Y., Ladle, R.J., Aragao, L., Shimabukuro, Y., Phillips, O.L., Influence of landscape heterogeneity on spatial patterns of wood productivity, wood specific density and above ground biomass in Amazonia (2009) Biogeosciences, 6, pp. 1883-1902; Asner, G.P., Alencar, A., Drought impacts on the Amazon forest: the remote sensing perspective (2010) New Phytologist, 187, pp. 569-578; Asner, G.P., Loarie, S.R., Heyder, U., Combined effects of climate and land-use change on the future of humid tropical forests (2010) Conservation Letters, 3, pp. 395-403; Baraloto, C., Paine, C.E.T., Patiño, S., Bonal, D., Herault, B., Chave, J., Functional trait variation and sampling strategies in species-rich plant communities (2010) Functional Ecology, 24, pp. 208-216; Baraloto, C., Paine, C.E.T., Poorter, L., Beauchene, J., Bonal, D., Domenach, A.M., Hérault, B., Chave, J., Decoupled leaf and stem economics in rain forest trees (2010) Ecology Letters, 13, pp. 1338-1347; Baraloto, C., Rabaud, S., Molto, Q., Blanc, L., Fortunel, C., Hérault, B., Davila, N., Fine, P.V.A., Disentangling stand and environmental correlates of aboveground biomass in Amazonian forests (2011) Global Change Biology, 17, pp. 2677-2688; Baraloto, C., Molto, Q., Rabaud, S., Hérault, B., Valencia, R., Blanc, L., Fine, P.V.A., Thompson, J., Rapid simultaneous estimation of aboveground biomass and tree diversity across Neotropical forests: a comparison of field inventory methods (2013) Biotropica, 45, pp. 288-298; Belyea, L.R., Lancaster, J., Assembly rules within a contingent ecology (1999) Oikos, 86, pp. 402-416; Berry, S.L., Roderick, M.L., Estimating mixtures of leaf functional types using continental-scale satellite and climatic data (2002) Global Ecology and Biogeography, 11, pp. 23-39; Brando, P.M., Nepstad, D.C., Balch, J.K., Bolker, B., Christman, M.C., Coe, M., Putz, F.E., Fire-induced tree mortality in a neotropical forest: the roles of bark traits, tree size, wood density and fire behavior (2012) Global Change Biology, 18, pp. 630-641; Burnham, K.P., Anderson, D.R., Multimodel inference – understanding AIC and BIC in model selection (2004) Sociological Methods & Research, 33, pp. 261-304; Calcagno, V., de Mazancourt, C., glmulti: an R package for easy automated model selection with (generalized) linear models (2010) Journal of Statistical Software, 34, pp. 1-29; Chapin, F.S., BretHarte, M.S., Hobbie, S.E., Zhong, H.L., Plant functional types as predictors of transient responses of arctic vegetation to global change (1996) Journal of Vegetation Science, 7, pp. 347-358; Chaturvedi, R.K., Raghubanshi, A.S., Singh, J.S., Leaf attributes and tree growth in a tropical dry forest (2011) Journal of Vegetation Science, 22, pp. 917-931; Chave, J., Coomes, D., Jansen, S., Lewis, S.L., Swenson, N.G., Zanne, A.E., Towards a worldwide wood economics spectrum (2009) Ecology Letters, 12, pp. 351-366; Cingolani, A.M., Cabido, M., Gurvich, D.E., Renison, D., Diaz, S., Filtering processes in the assembly of plant communities: are species presence and abundance driven by the same traits? 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(2008) Functional Ecology, 22, pp. 134-147; Lebrija-Trejos, E., Perez-Garcia, E.A., Meave, J.A., Bongers, F., Poorter, L., Functional traits and environmental filtering drive community assembly in a species-rich tropical system (2010) Ecology, 91, pp. 386-398; Liu, X., Swenson, N.G., Wright, S.J., Zhang, L., Song, K., Du, Y., Zhang, J., Ma, K., Covariation in plant functional traits and soil fertility within two species-rich forests (2012) PLoS ONE, 7, pp. e34767; Lortie, C.J., Brooker, R.W., Choler, P., Kikvidze, Z., Michalet, R., Pugnaire, F.I., Callaway, R.M., Rethinking plant community theory (2004) Oikos, 107, pp. 433-438; Malhi, Y., Roberts, J.T., Betts, R.A., Killeen, T.J., Li, W.H., Nobre, C.A., Climate change, deforestation, and the fate of the Amazon (2008) Science, 319, pp. 169-172; Muller-Landau, H.C., Interspecific and inter-site variation in wood specific gravity of tropical trees (2004) Biotropica, 36, pp. 20-32; Niinemets, U., Components of leaf dry mass per area – thickness and density – alter leaf photosynthetic capacity in reverse directions in woody plants (1999) New Phytologist, 144, pp. 35-47; Oksanen, J.F., Blanchet, G., Kindt, R., Legendre, P., Minchin, P.R., O'Hara, R.B., Simpson, G.L., Wagner, H., (2012), http://CRAN.R-project.org/package=vegan, vegan: Community Ecology Package. 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Christensen-Dalsgaard, K.K.; Ennos, A.R.; Fournier, M. |
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Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees |
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Journal Article |
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2007 |
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Journal of Experimental Botany |
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J. Exp. Bot. |
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58 |
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15-16 |
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4095-4105 |
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Buttress roots; Density; Hydraulic conductivity; Hydraulic-mechanical trade-offs; Modulus of elasticity; Tropical trees; Wood; Elastic moduli; Hydraulic conductivity; Wood; Buttress roots; Hydraulic-mechanical trade-offs; Tropical trees; Forestry; water; article; biomechanics; histology; legume; physiology; plant root; plant stem; tree; wood; Xylopia; Biomechanics; Fabaceae; Plant Roots; Plant Stems; Trees; Water; Wood; Xylopia; Conductivity; Elastic Strength; Forestry; Wood |
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Roots have been described as having larger vessels and so greater hydraulic efficiency than the stem. Differences in the strength and stiffness of the tissue within the root system itself are thought to be an adaptation to the loading conditions experienced by the roots and to be related to differences in density. It is not known how potential mechanical adaptations may affect the hydraulic properties of the roots. The change in strength, stiffness, conductivity, density, sapwood area, and second moment of area distally along the lateral roots of two tropical tree species in which the strain is known to decrease rapidly was studied and the values were compared with those of the trunk. It was found that as the strain fell distally along the roots, so did the strength and stiffness of the tissue, whereas the conductivity increased exponentially. These changes appeared to be related to differences in density. In contrast to the distal-most roots, the tissue of the proximal roots had a lower conductivity and higher strength than that of the trunk. This suggests that mechanical requirements on the structure rather than the water potential gradient from roots to branches are responsible for the general pattern that roots have larger vessels than the stem. In spite of their increased transectional area, the buttressed proximal roots were subjected to higher levels of stress and had a lower total conductivity than the rest of the root system. © 2007 The Author(s). |
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AgroParisTech, LERFOB, Ecole Nationale du Genie Rural, des Eaux et Forêts, 14 Avenue Girardet-CS 4216, 54000 Nancy Cedex, France |
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Cited By (since 1996): 6; Export Date: 22 October 2011; Source: Scopus; Coden: Jeboa; doi: 10.1093/jxb/erm268; PubMed ID: 18039738; Language of Original Document: English; Correspondence Address: Christensen-Dalsgaard, K.K.; University of Manchester, Faculty of Life Sciences, Jackson's Mill, Manchester M60 1QD, United Kingdom; email: karen@cd-mail.dk; Chemicals/CAS: water, 7732-18-5; Water, 7732-18-5 |
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Fournier, M.; Dlouhá, J.; Jaouen, G.; Almeras, T. |
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Integrative biomechanics for tree ecology: Beyond wood density and strength |
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2013 |
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Journal of Experimental Botany |
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J. Exp. Bot. |
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64 |
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15 |
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4793-4815 |
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Biomechanics; Ecological strategy; Gravitropism; Shape; Size; Trees; Wood |
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Functional ecology has long considered the support function as important, but its biomechanical complexity is only just being elucidated. We show here that it can be described on the basis of four biomechanical traits, two safety traits against winds and self-buckling, and two motricity traits involved in sustaining an upright position, tropic motion velocity (MV) and posture control (PC). All these traits are integrated at the tree scale, combining tree size and shape together with wood properties. The assumption of trait constancy has been used to derive allometric scaling laws, but it was more recently found that observing their variations among environments and functional groups, or during ontogeny, provides more insights into adaptive syndromes of tree shape and wood properties. However, oversimpli-fed expressions have often been used, possibly concealing key adaptive drivers. An extreme case of oversimplification is the use of wood basic density as a proxy for safety. Actually, as wood density is involved in stiffiness, loads, and construction costs, the impact of its variations on safety is non-trivial. Moreover, other wood features, especially the microfibril angle (MFA), are also involved. Furthermore, wood is not only stiff and strong, but it also acts as a motor for MV and PC. The relevant wood trait for this is maturation strain asymmetry. Maturation strains vary with cell-wall characteristics such as MFA, rather than with wood density. Finally, the need for further studies about the ecological relevance of branching patterns, motricity traits, and growth responses to mechanical loads is discussed. © The Author 2013. |
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CNRS, Université de Montpellier 2, Laboratoire de Mécanique et Génie Civil, 34095 Montpellier, France |
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Cited By (since 1996):1; Export Date: 2 December 2013; Source: Scopus; Coden: Jeboa; doi: 10.1093/jxb/ert279; Language of Original Document: English; Correspondence Address: Fournier, M.; AgroParisTech, UMR 1092 LERFOB, 54000 Nancy, France; email: meriem.fournier@agroparistech.fr; References: Achim, A., Ruel, J.C., Gardiner, B.A., Lafamme, G., Meunier, S., Modelling the vulnerability of balsam fr forests to wind damage (2005) Forest Ecology and Management, 204, pp. 35-50; Almeras, T., Costes, E., Salles, J.C., Identification of biomechanical factors involved in stem shape variability between apricot-tree varieties (2004) Annals of Botany, 93, pp. 1-14; Almeras, T., Derycke, M., Jaouen, G., Beauchene, J., Fournier, M., Functional diversity in gravitropic reaction among tropical seedlings in relation to ecological and developmental traits (2009) Journal of Experimental Botany, 60, pp. 4397-4410; Almeras, T., Fournier, M., Biomechanical design and longterm stability of trees: Morphological and wood traits involved in the balance between weight increase and the gravitropic reaction (2009) Journal of Theoretical Biology, 256, pp. 370-381; Almeras, T., Gril, J., Costes, E., Bending of apricot tree branches under the weight of axillary growth: Test of a mechanical model with experimental data (2002) Trees – Structure and Function, 16, pp. 5-15; Almeras, 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 – Structure and Function, 19, pp. 457-467; Anten, N.P.R., Schieving, F., The role of wood mass density and mechanical constraints in the economy of tree architecture (2010) American Naturalist, 175, pp. 250-260; Archer, R.R., Wilson, B.F., Mechanics of the compression wood response II. 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EcoFoG @ webmaster @ |
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513 |
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Honorio Coronado, E.N.; Blanc-Jolivet, C.; Mader, M.; García-Dávila, C.R.; Gomero, D.A.; del Castillo Torres, D.; Llampazo, G.F.; Pizango, G.H.; Sebbenn, A.M.; Meyer-Sand, B.R.V.; Paredes-Villanueva, K.; Tysklind, N.; Troispoux, V.; Massot, M.; Carvalho, C.; de Lima, H.C.; Cardoso, D.; Degen, B. |
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Title |
SNP markers as a successful molecular tool for assessing species identity and geographic origin of trees in the economically important South American legume genus Dipteryx |
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Journal Article |
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Year |
2020 |
Publication |
Journal of Heredity |
Abbreviated Journal |
J. Hered. |
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Volume |
111 |
Issue |
4 |
Pages |
346-356 |
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Keywords |
Cumaru; Genetic assignment; Leguminosae; Timber verification; article; chloroplast; genetic association; genetic marker; geographic origin; indel mutation; nonhuman; single nucleotide polymorphism; species identification; structure analysis; tonka bean; Dipteryx; Fabaceae |
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Dipteryx timber has been heavily exploited in South America since 2000s due to the increasing international demand for hardwood. Developing tools for the genetic identification of Dipteryx species and their geographical origin can help to promote legal trading of timber. A collection of 800 individual trees, belonging to 6 different Dipteryx species, was genotyped based on 171 molecular markers. After the exclusion of markers out of Hardy-Weinberg equilibrium or with no polymorphism or low amplification, 83 nuclear, 29 chloroplast, 13 mitochondrial single nucleotide polymorphisms (SNPs), and 2 chloroplast and 5 mitochondrial INDELS remained. Six genetic groups were identified using Bayesian Structure analyses of the nuclear SNPs, which corresponded to the different Dipteryx species collected in the field. Seventeen highly informative markers were identified as suitable for species identification and obtained self-assignment success rates to species level of 78-96%. An additional set of 15 molecular markers was selected to determine the different genetic clusters found in Dipteryx odorata and Dipteryx ferrea, obtaining self-assignment success rates of 91-100%. The success to assign samples to the correct country of origin using all or only the informative markers improved when using the nearest neighbor approach (69-92%) compared to the Bayesian approach (33-80%). While nuclear and chloroplast SNPs were more suitable for differentiating the different Dipteryx species, mitochondrial SNPs were ideal for determining the genetic clusters of D. odorata and D. ferrea. These 32 selected SNPs will be invaluable genetic tools for the accurate identification of species and country of origin of Dipteryx timber. © The American Genetic Association 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com |
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Instituto de Biologia, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s.n., Ondina, Salvador, BA, 40170-115, Brazil |
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Oxford University Press |
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00221503 (Issn) |
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no |
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EcoFoG @ webmaster @ |
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965 |
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Grangier, J.; Dejean, A.; Male, P.J.G.; Solano, P.J.; Orivel, J. |
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Title |
Mechanisms driving the specificity of a myrmecophyte-ant association |
Type |
Journal Article |
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Year |
2009 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
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Volume |
97 |
Issue |
1 |
Pages |
90-97 |
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Allomerus decemarticulatus; exclusion filters; Hirtella physophora; horizontal transmission; host recognition; mutualism |
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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 @ |
Serial |
114 |
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Dejean, A.; Djieto-Lordon, C.; Orivel, J. |
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Title |
The plant ant Tetraponera aethiops (Pseudomyrmecinae) protects its host myrmecophyte Barteria fistulosa (Passifloraceae) through aggressiveness and predation |
Type |
Journal Article |
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Year |
2008 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
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Volume |
93 |
Issue |
1 |
Pages |
63-69 |
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Keywords |
ants; plant protection; territorial aggressiveness |
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Plant ants generally provide their host myrmecophytes (i.e. plants that shelter a limited number of ant species in hollow structures) protection from defoliating insects, but the exact nature of this protection is poorly known. It was with this in mind that we studied the association between Tetraponera aethiops F. Smith (Pseudomyrmecinae) and its specific host myrmecophyte Barteria fistulosa Mast. (Passifloraceae). Workers bore entrances into the horizontal hollow branches (domatia) of their host B. fistulosa, near the base of the petiole of the alternate horizontal leaves. They then ambush intruders from the domatia, close to these entrances. After perceiving the vibrations caused when an insect lands on a leaf, they rush to it and sting and generally spreadeagle the insect (only small caterpillars are mastered by single workers). Among the insects likely to defoliate B. fistulosa, adult leaf beetles and large katydids were taken as prey and cut up; single workers then retrieved some pieces, whereas other workers imbibed the prey's haemolymph. Other insects known to defoliate this plant, if unable to escape, were killed and discarded. Small Acrea zetes L. caterpillars were stung and then discarded by single workers; whereas locusts of different sizes were mastered by groups of workers that stung and spreadeagled them before discarding them (although a part of their haemolymph was imbibed). More workers were involved and more time was necessary to master insects taken as prey than those attacked and discarded. Consequently, the protection T. aethiops workers provide to their host B. fistulosa from defoliating insects results from predation, but more often from a type of aggressiveness wherein insects are killed and then discarded. (c) 2008 The Linnean Society of London. |
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Address |
[Dejean, Alain] CNRS Guyane, UPS 2561, F-97300 Cayenne, France, Email: alain.dejean@wanadoo.fr |
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BLACKWELL PUBLISHING |
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0024-4066 |
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ISI:000251738300007 |
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no |
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EcoFoG @ eric.marcon @ |
Serial |
213 |
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Gibernau, M.; Orivel, J.; Delabie, J.H.C.; Barabe, D.; Dejean, A. |
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Title |
An asymmetrical relationship between an arboreal ponerine ant and a trash-basket epiphyte (Araceae) RID D-4390-2009 RID C-4034-2011 |
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Journal Article |
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Year |
2007 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
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Volume |
91 |
Issue |
3 |
Pages |
341-346 |
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Keywords |
hanging soil; mutualism; nest site selection; plant protection |
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Abstract |
The relationship between ants and Philodendron insigne, a trash-basket epiphyte abundant along streams, was studied in French Guiana. Only a few (3%) of the young plants sheltered ants, whereas 90% of the mature individuals did. The most frequent associate was Odontomachus hastatus (Fabricius), an arboreal ponerine ant, and its nests were almost entirely (94.4%) located in P. insigne root clusters. Experimental choice tests conducted on O. hastatus workers confirmed their preference for P. insigne. We propose that the interactions between P. insigne and ants may be intermediate between non-obligatory, reward-based interactions and obligatory, specific ant-myrmecophyte interactions because (1) almost all mature P. insigne individuals are associated with ants; (2) O. hastatus is the most frequent when diverse ants nest in its root clusters; (3) ants colonize mature P. insigne, but rarely young individuals; (4) ants, particularly O. hastatus, protect the foliage of their host; and (5) at least one ant species, O. hastatus, prefers P. insigne over other host plants. The latter relationship is asymmetrical because P. insigne is inhabited by diverse ants whereas O. hastatus nests almost exclusively in P. insigne. (c) 2007 The Linnean Society of London, Biological Journal of the Linnean Society, 2007, 91, 341-346. |
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Univ Toulouse 3, Lab Evolut & Divers Biol, UMR 5174, CNRS,UPS, F-31062 Toulouse 9, France, Email: dejean@cict.fr |
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Blackwell Publishing |
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English |
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0024-4066 |
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WOS:000247817100001 |
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no |
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EcoFoG @ webmaster @ |
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356 |
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Schmidt, M.; Dejean, A. |
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A dolichoderine ant that constructs traps to ambush prey collectively: convergent evolution with a myrmicine genus |
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Journal Article |
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Year |
2018 |
Publication |
Biological Journal of the Linnean Society |
Abbreviated Journal |
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124 |
Issue |
1 |
Pages |
41-46 |
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Azteca brevis Forel, a dolichoderine ant species, builds along the branches of its host plant galleries that bear numerous holes slightly wider than a worker’s head. We noted that the workers hide, mandibles open, beneath different holes, waiting for arthropod prey to walk by or alight. They seize the extremities of these arthropods and pull backwards, immobilizing the prey, which is then spreadeagled and later carved up or pulled into a gallery before being carved up. The total duration of the capture ranges from a few minutes to several hours. This ambush group hunting permits the capture of insects of a wide range of sizes, with the largest being 48.71 times heavier than the workers, something that we compared with other cases of group hunting by ants and trap use by other arthropods. A convergence with myrmicine ants of the genus Allomerus is shown. Thus, this study also shows that the genus Azteca presents the largest panel of group hunting strategies by ants and that there is polyethism related to polymorphism, as hunting workers are larger than their nestmates. We concluded that these gallery-shaped traps correspond to the notion of ‘extended phenotype’. |
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0024-4066 |
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Notes |
10.1093/biolinnean/bly028 |
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EcoFoG @ webmaster @ |
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822 |
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