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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 |
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Biological Journal of the Linnean Society |
Abbreviated Journal |
Biol. J. Linnean Soc. |
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91 |
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3 |
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341-346 |
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hanging soil; mutualism; nest site selection; plant protection |
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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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EcoFoG @ webmaster @ |
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356 |
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Latouche-Hallé, C.; Ramboer, A.; Bandou, E.; Caron, H.; Kremer, A. |
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Title |
Nuclear and chloroplast genetic structure indicate fine-scale spatial dynamics in a neotropical tree population |
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Journal Article |
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Year |
2003 |
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Heredity |
Abbreviated Journal |
Heredity |
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Volume |
91 |
Issue |
2 |
Pages |
181-190 |
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Keywords |
Dicorynia guianensis; Gene flow; Genetic differentiation; Microsatellites; Spatial analysis; Tropical tree; gene flow; genetic structure; population genetics; spatial analysis; tree; tropical forest; Cell Nucleus; Chloroplasts; Cohort Studies; DNA, Plant; French Guiana; Genetic Markers; Pollen; Population Dynamics; Seeds; Trees; Variation (Genetics); French Guiana; Dicorynia guianensis; Embryophyta |
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Abstract |
Dicorynia guianensis is a canopy tree, endemic to the tropical rain forest of French Guiana. We compared generational and spatial genetic structure for maternally and biparentally inherited markers in two cohorts (adult and seedling) in order to infer processes shaping the distribution of genetic diversity. The study was conducted on a 40 ha study plot located at Paracou near Kourou, where 172 adults trees and 375 saplings were sampled. Aggregation of trees was therefore suggested at different distances, ranging from 100 to 400 m. There was a strong link between demographic and genetic spatial structures at small distances (less than 100 m) that is likely to be the consequence of restricted seed dispersal. Genetic differentiation was more pronounced between spatial aggregates than between cohorts. Despite the spatial differentiation, the species was able to maintain high levels of diversity for maternal genomes, suggesting rapid turnover of aggregates. Spatial autocorrelation was larger for chloroplast than nuclear markers indicating a strong asymmetry between pollen and seed flow. Fixation indices indicated a lower heterozygote deficiency for the adults, maybe because of gradual elimination of selfed trees. Genetic relatedness at lower distances was higher in adult trees than in saplings, as a result of generation overlapping in the adult cohort. Overall, our results confirm earlier biological knowledge about the dispersion mechanisms of the species, and lead to an enhanced role of spatial processes in the dynamics of genetic diversity of D. guianensis. |
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INRA Lab. Genet. Arbres Forestiers, BP45, 33611 Gazinet Cedex, France |
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0018067x (Issn) |
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Cited By (since 1996): 34; Export Date: 22 October 2011; Source: Scopus; Coden: Hdtya; doi: 10.1038/sj.hdy.6800296; PubMed ID: 12886285; Language of Original Document: English; Correspondence Address: Caron, H.; INRA Lab. Genet. Arbres Forestiers, BP45, 33611 Gazinet Cedex, France; email: caron@pierroton.inra.fr; Chemicals/CAS: DNA, Plant; Genetic Markers |
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EcoFoG @ webmaster @ |
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358 |
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Baraloto, Christophier ; Vleminckx, Jason ; Engel, Julien ; Petronelli, Pascal ; Davila, Nallarett ; Rios, Marcos ; Valderrama Sandoval, Elvis Harry ; Mesones, Italo ; Guevara ANdino, Juan Ernesto ; Fortunel, Claire ; Allie, Elodie ; Paine, C.E. Timothy ; Dourdan, Aurélie ; Goret, Jean-Yves ; Valverde-Barrantes, Oscar J. ; Draper, Freddie ; Fine, Paul V. A. |
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Title |
Biogeographic history and habitat specialization shape floristic and phylogenetic composition across Amazonian forests |
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Journal Article |
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Year |
2021 |
Publication |
Ecological Monographs |
Abbreviated Journal |
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Volume |
91 |
Issue |
4 |
Pages |
e01473 |
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A major challenge remains to understand the relative contributions of history, dispersal, and environmental filtering to the assembly of hyperdiverse communities across spatial scales. Here, we examine the extent to which biogeographical history and habitat specialization have generated turnover among and within lineages of Amazonian trees across broad geographic and environmental gradients. We replicated standardized tree inventories in 102 0.1-ha plots located in two distant regions—the western Amazon and the eastern Guiana shield. Within each region, we used a nested design to replicate plots on contrasted habitats: white-sand, terra firme, and seasonally flooded forests. Our plot network encompassed 26,386 trees that together represented 2,745 distinct taxa, which we standardized across all plots and regions. We combined taxonomic and phylogenetic data with detailed soil measurements and climatic data to: (1) test whether patterns of taxonomic and phylogenetic composition are consistent with recent or historical processes, (2) disentangle the relative effects of habitat, environment, and geographic distance on taxonomic and phylogenetic turnover among plots, and (3) contrast the proportion of habitat specialists among species from each region. We found substantial species turnover between Peru and French Guiana, with only 8.8% of species shared across regions; genus composition remained differentiated across habitats and regions, whereas turnover at higher taxonomic levels (family, order) was much lower. Species turnover across plots was explained primarily by regions, but also substantially by habitat differences and to a lesser extent by spatial distance within regions. Conversely, the composition of higher taxonomic levels was better explained by habitats (especially comparing white-sand forests to other habitats) than spatial distance. White-sand forests harbored most of the habitat specialists in both regions, with stronger habitat specialization in Peru than in French Guiana. Our results suggest that recent diversification events have resulted in extremely high turnover in species and genus composition with relatively little change in the composition of higher lineages. Our results also emphasize the contributions of rare habitats, such as white-sand forests, to the extraordinary diversity of the Amazon and underline their importance as conservation priorities. |
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Ecological Society of America |
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EcoFoG @ webmaster @ |
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1027 |
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Author |
Dutech, C.; Joly, H.I.; Jarne, P. |
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Title |
Gene flow, historical population dynamics and genetic diversity within French Guianan populations of a rainforest tree species, Vouacapoua americana |
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Journal Article |
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Year |
2004 |
Publication |
Heredity |
Abbreviated Journal |
Heredity |
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Volume |
92 |
Issue |
2 |
Pages |
69-77 |
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Keywords |
bottleneck; climatic change; extinction-recolonization; microsatellite; neotropical rainforest; pollen and seed dispersal |
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Abstract |
Both gene flow and historical events influence the genetic diversity of natural populations. One way to understand their respective impact is to analyze population genetic structure at large spatial scales. We studied the distribution of genetic diversity of 17 populations of Vouacapoua americana (Caesalpiniaceae) in French Guiana, using nine micro satellite loci. Low genetic diversity was observed within populations, with a mean allelic richness and gene diversity of 4.1 and 0.506, respectively, which could be due to low effective population size and/or past bottlenecks. Using the regression between F-st/(1-F-st), estimated between pairs of populations, and the logarithm of the geographical distance, the spatial genetic structure can partly be explained by isolation-by-distance and limited gene flow among populations. This result is in agreement with the species' biology, including seed and pollen dispersal by rodents and insects, respectively. In contrast, no clear genetic signal of historical events was found when examining genetic differentiation among populations in relation to biogeographical hypotheses or by testing for bottlenecks within populations. Our conclusion is that nuclear spatial genetic structure of V. americana, at the geographic scale of French Guiana, is better explained by gene flow rather than by historical events. |
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Cirad Foret Silvolab, Lab Genet & Ecol Mol, F-97387 Kourou, France, Email: cdutech@bordeaux.inra.fr |
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NATURE PUBLISHING GROUP |
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0018-067X |
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ISI:000188431700003 |
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no |
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EcoFoG @ eric.marcon @ |
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240 |
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Author |
Nicolini, E.; Caraglio, Y.; Pelissier, R.; Leroy, C.; Roggy, J.C. |
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Title |
Epicormic branches: a growth indicator for the tropical forest tree, Dicorynia guianensis Amshoff (Caesalpiniaceae) |
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Journal Article |
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Year |
2003 |
Publication |
Annals of Botany |
Abbreviated Journal |
Ann. Bot. |
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Volume |
92 |
Issue |
1 |
Pages |
97-105 |
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Keywords |
Dicorynia guianensis; architecture; epicormic branch; primary growth; secondary growth; tropical forest; French Guiana; height : diameter ratio |
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Architectural analyses of temperate tree species using a chronological approach suggest that the expression of epicormic branches is closely related to low growth rates in the axes that make up the branching system. Therefore, sole consideration of epicormic criteria may be sufficient to identify trees with low secondary growth levels or with both low primary and secondary growth levels. In a tropical tree such as Dicorynia guianensis (basralocus), where chronological studies are difficult, this relationship could be very useful as an easily accessible indicator of growth potentials. A simple method of architectural tree description was used to characterize the global structure of more than 1650 basralocus trees and to evaluate their growth level. Measurements of simple growth characters [height, basal diameter, internode length of submittal part (top of the main axis of the tree)] and the observation of four structural binary descriptors on the main stem (presence of sequential branches and young epicormic branches, state of the submittal part, global orientation), indicated that epicormic branch formation is clearly related to a decrease in length of the successive growth units of the main stem. Analysis of height vs. diameter ratios among different tree subgroups, with and without epicormic branching, suggested that trees with epicormic branches generally have a low level of secondary growth compared with primary growth. (C) 2003 Annals of Botany Company. |
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Cirad, UMR AMAP, F-34398 Montpellier 05, France |
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OXFORD UNIV PRESS |
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0305-7364 |
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ISI:000183980200010 |
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no |
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EcoFoG @ eric.marcon @ |
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245 |
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Scotti-Saintagne, C.; Bodenes, C.; Barreneche, T.; Pot, D.; Plomion, C.; Kremer, A. |
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Title |
Distribution of genomic regions differentiating oak species assessed by QTL detection |
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Journal Article |
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Year |
2004 |
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Heredity |
Abbreviated Journal |
Heredity |
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Volume |
92 |
Issue |
1 |
Pages |
20-30 |
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QTL; leaf morphology; repeatability; genetic map; Q. robur |
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Abstract |
Pedunculate oak and sessile oak are two sympatric inter-fertile species that exhibit leaf morphological differences. We aimed to detect quantitative trait loci (QTLs) of these traits in order to locate genomic regions involved in species differentiation. A total of 15 leaf morphological traits were assessed in a mixed forest stand composed of Quercus petraea and Q. robur and in a full-sib pedigree of Q. robur. The progeny of the full-sib family were vegetatively propagated in two successive experiments comprising 174 and 216 sibs, and assessments were made on two leaves collected on each of the 1080 and 1530 cuttings corresponding to the two experiments. Traits that exhibited strong species differences in the mixed stand tended also to have higher repeatability values in the mapping population, thus indicating higher genetic control. A genetic map was constructed for QTL detection. Composite interval mapping with the one QTL model was used for QTL detection. From one to three QTLs were detected for 13 traits. In-depth analysis of the QTLs, controlling the five morphological traits that exhibited the highest interspecific differences in the mixed stand, indicated that they were distributed on six linkage groups, with two clusters comprising QTLs of at least two discriminant traits. These results were reinforced when error 1 for QTL detection was set at 5% at the chromosome level, as up to nine clusters could be identified. In conclusion, traits involved in interspecific differentiation of oaks are under polygenic control and widespread in clusters across the genome. |
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INRA, UMR Biodivers Genes & Ecosyst, F-33612 Cestas, France |
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NATURE PUBLISHING GROUP |
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0018-067X |
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ISI:000187216300005 |
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no |
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EcoFoG @ eric.marcon @ |
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267 |
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Aili, S.R.; Touchard, A.; Escoubas, P.; Padula, M.P.; Orivel, J.; Dejean, A.; Nicholson, G.M. |
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Title |
Diversity of peptide toxins from stinging ant venoms |
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Journal Article |
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Year |
2014 |
Publication |
Toxicon |
Abbreviated Journal |
Toxicon |
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92 |
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166-178 |
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Ant venom; Chemotaxonomy; Disulfide linkage; Peptides; Venom biochemistry |
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Abstract |
Ants (Hymenoptera: Formicidae) represent a taxonomically diverse group of arthropods comprising nearly 13,000 extant species. Sixteen ant subfamilies have individuals that possess a stinger and use their venom for purposes such as a defence against predators, competitors and microbial pathogens, for predation, as well as for social communication. They exhibit a range of activities including antimicrobial, haemolytic, cytolytic, paralytic, insecticidal and pain-producing pharmacologies. While ant venoms are known to be rich in alkaloids and hydrocarbons, ant venoms rich in peptides are becoming more common, yet remain understudied. Recent advances in mass spectrometry techniques have begun to reveal the true complexity of ant venom peptide composition. In the few venoms explored thus far, most peptide toxins appear to occur as small polycationic linear toxins, with antibacterial properties and insecticidal activity. Unlike other venomous animals, a number of ant venoms also contain a range of homodimeric and heterodimeric peptides with one or two interchain disulfide bonds possessing pore-forming, allergenic and paralytic actions. However, ant venoms seem to have only a small number of monomeric disulfide-linked peptides. The present review details the structure and pharmacology of known ant venom peptide toxins and their potential as a source of novel bioinsecticides and therapeutic agents. |
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Laboratoire Écologie Fonctionnelle et Environnement, Université de Toulouse, 118 Route de NarbonneToulouse, France |
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Elsevier Ltd |
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00410101 (Issn) |
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Export Date: 2 December 2014; Coden: Toxia; Correspondence Address: Nicholson, G.M.; Neurotoxin Research Group, School of Medical and Molecular Biosciences, University of Technology SydneyAustralia |
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EcoFoG @ webmaster @ |
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568 |
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Faustin, M.; Maciuk, A.; Salvin, P.; Roos, C.; Lebrini, M. |
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Corrosion inhibition of C38 steel by alkaloids extract of Geissospermum laeve in 1M hydrochloric acid: Electrochemical and phytochemical studies |
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Journal Article |
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2015 |
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Corrosion Science |
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Corrosion Science |
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92 |
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287-300 |
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A. C38 steel; B. Eis; B. Sem; C. Acid corrosion; C. Anodic protection; C. Cathodic protection |
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Corrosion inhibition by alkaloids extract (AE) from Geissospermum laeve on C38 steel in 1. M HCl is investigated with electrochemical studies. Inhibition efficiency of 92% is reached with 100. mg/L of AE at 25. °C. Potentiodynamic polarization showed that the extract behaves as mixed-type inhibitors. The Nyquist plots showed that increasing AE concentration, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir adsorption isotherm. Immersion time and temperature effects were investigated using EIS and potentiodynamic polarization. SEM and EDX supported the adsorption conclusions. The active compound responsible for the corrosion inhibition is geissospermine. |
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Laboratoire de Pharmacognosie-Chimie des Substances Naturelles et Chimiotherapies Antiparasitaires, BioCIS, Université Paris-SudChâtenay-Malabry, France |
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Export Date: 6 February 2015 |
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EcoFoG @ webmaster @ |
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584 |
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Baraloto, C.; Forget, P.M.; Goldberg, D.E. |
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Seed mass, seedling size and neotropical tree seedling establishment |
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Journal Article |
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Year |
2005 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
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93 |
Issue |
6 |
Pages |
1156-1166 |
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French Guiana; life-history trade-offs; microhabitat; path analysis; regeneration strategy; relative growth rate; seedling survival; shade tolerance |
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Abstract |
1 We examined among- and within-species effects of seed mass for seedling establishment from seed to 5 years of age in a field experiment at Paracou, French Guiana. 2 Six seeds of each of eight species were weighed and planted into each of 120 plots (1 m(2)) throughout closed-canopy forest along 12 100-m transects in 1998. 3 We described the microhabitat of each planting site using principal components derived from measurements of light availability, soil moisture, carbon and nitrogen content, and soil phosphorus availability. Although both survival and relative growth rate (RGR) increased with increasing light availability, no other microhabitat variable significantly affected seedling performance. Nor did the magnitude of microhabitat effects on survival or RGR differ among species. 4 Larger-seeded species were more likely to survive from germination to 1 year as well as from 1 to 5 years of age. RGR for seedling height during the first year post-germination was not related to seed mass, but smaller-seeded species did grow slightly faster thereafter. Path analyses revealed that correlations between seed mass and performance were explained in part because larger seeds produced larger initial seedlings, which tended to survive better but grow more slowly. 5 We also analysed within-species effects of seed mass for the larger-seeded Eperua grandiflora and Vouacapoua americana (both Caesalpiniaceae). Larger seeds produced larger seedlings in both species, but larger seeds survived better only for Eperua. Larger seedlings grew more slowly in both species, but did not offset the early (Eperua) and later (Vouacapoua) positive direct effects of seed mass on RGR that may represent contrasting strategies for reserve deployment. 6 Our results demonstrate that seed size influences performance within and among species in part because of indirect effects of initial seedling size. However, we suggest that traits tightly correlated with seed mass at the species level, such as specific leaf area, leaf longevity and photosynthetic capacity, may also contribute to interspecific performance differences. |
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Museum Natl Hist Nat, Dept Ecol & Gest Biodivers, UMR 5176, CNRS, Brunoy, France, Email: baraloto.c@kourou.cirad.fr |
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BLACKWELL PUBLISHING |
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0022-0477 |
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ISI:000233287500012 |
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EcoFoG @ eric.marcon @ |
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250 |
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Dejean, A.; Djieto-Lordon, C.; Orivel, J. |
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The plant ant Tetraponera aethiops (Pseudomyrmecinae) protects its host myrmecophyte Barteria fistulosa (Passifloraceae) through aggressiveness and predation |
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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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Abstract |
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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Publisher |
BLACKWELL PUBLISHING |
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ISSN |
0024-4066 |
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Notes |
ISI:000251738300007 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
213 |
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