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Dejean, A.; Petitclerc, F.; Roux, O.; Orivel, J.; Leroy, C. |
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Title |
Does exogenic food benefit both partners in an ant-plant mutualism? the case of Cecropia obtusa and its guest Azteca plant-ants |
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Journal Article |
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2012 |
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Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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335 |
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3 |
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214-219 |
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Ant-plant mutualisms; Azteca; Cecropia obtusa; Myrmecotrophy; Stable isotopes |
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Abstract  |
In the mutualisms involving the myrmecophyte Cecropia obtusa and Azteca ovaticeps or A. alfari, both predatory, the ants defend their host trees from enemies and provide them with nutrients (myrmecotrophy). A. ovaticeps provisioned with prey and then 15N-enriched food produced more individuals than did control colonies (not artificially provisioned). This was not true for A. alfari colonies, possibly due to differences in the degree of maturity of the colonies for the chosen range of host tree sizes (less than 3 m in height). Myrmecotrophy was demonstrated for both Azteca species as provisioning the ants with 15N-enriched food translated into higher δ 15N values in host plant tissues, indicating that nitrogen passed from the food to the plant. Thus, the predatory activity of their guest ants benefits the Cecropia trees not only because the ants protect them from defoliators since most prey are phytophagous insects but also because the plant absorbs nutrients. © 2012 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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IRD, Maladies Infectieuses et Vecteurs, Équipe BEES-IRD, BP 171, Bobo-Dioulasso, Burkina Faso |
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16310691 (Issn) |
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Export Date: 15 April 2012; Source: Scopus; Coden: Crboc; doi: 10.1016/j.crvi.2012.01.002; Language of Original Document: English; Correspondence Address: Dejean, A.; CNRS, Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus Agronomique, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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391 |
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Dejean, A.; Azémar, F.; Roux, O. |
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Title |
An invasive ant species able to counterattack marabunta raids |
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Journal Article |
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Year |
2014 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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337 |
Issue |
7-8 |
Pages |
475-479 |
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Antipredation; Army ants; Colony mate recognition; Eciton; Pheidole; aggression; ant; article; bioassay; Eciton burchellii; Eciton hamatum; emulsion; insect society; mass fragmentography; Neotropics; nonhuman; Pheidole megacephala |
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In the Neotropics where it was introduced, the invasive ant Pheidole megacephala counterattacked raids by the army ants Eciton burchellii or E. hamatum. The Eciton workers that returned to their bivouac were attacked and spread-eagled and most of them killed by their outgoing colony mates. Little by little the zone where returning and outgoing Eciton workers encountered one another moved away from the Pheidole nest which was no longer attacked, so that most of the colony was spared. Using a water-based technique rounded out by bioassays, we show that Pheidole compounds were transferred onto the Eciton cuticle during the counterattacks, so that outgoing workers do not recognize returning colony mates, likely perceived as potential prey. Because P. megacephala is an introduced African species, this kind of protection, which cannot be the result of coevolutive processes, corresponds to a kind of by-product due to its aggressiveness during colony defence. © 2014 Académie des sciences. |
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IRD, MIVEGEC (IRD 224 CNRS 5290-UM1-UM2) Équipe BEES, 911, avenue Agropolis, 34394 Montpellier cedex 5, France |
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Elsevier Masson SAS |
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17683238 (Issn) |
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Export Date: 1 September 2014; Coden: Crboc; Correspondence Address: Dejean, A.; CNRS UMR 8172, Écologie des Forêts de Guyane, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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557 |
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Hamon, P.; Duroy, P.-O.; Dubreuil-Tranchant, C.; Mafra D'Almeida Costa, P.; Duret, C.; Razafinarivo, N.J.; Couturon, E.; Hamon, S.; De Kochko, A.; Poncet, V.; Guyot, R. |
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Title |
Two novel Ty1-copia retrotransposons isolated from coffee trees can effectively reveal evolutionary relationships in the Coffea genus (Rubiaceae) |
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Journal Article |
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2011 |
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Molecular Genetics and Genomics |
Abbreviated Journal |
Mol. Genet. Genomics |
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285 |
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6 |
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447-460 |
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Coffea; Evolution; Genetic diversity; LTR-retrotransposons; article; coffee; controlled study; Divo; gene amplification; gene dosage; gene expression; gene insertion; gene locus; gene sequence; genetic identification; genetic polymorphism; genetic variability; molecular cloning; Nana; nonhuman; nucleotide sequence; phylogeny; plant evolution; plant gene; priority journal; Psilanthus; random amplified microsatellite; retroposon; Rubiaceae; species differentiation; tree; Ty1 copia gene; Coffea; Genes, Plant; Genome, Plant; Phylogeny; Retroelements |
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In the study, we developed new markers for phylogenetic relationships and intraspecies differentiation in Coffea. Nana and Divo, two novel Ty1-copia LTR-retrotransposon families, were isolated through C. canephora BAC clone sequencing. Nana- and Divo-based markers were used to test their: (1) ability to resolve recent phylogenetic relationships; (2) efficiency in detecting intra-species differentiation. Sequence-specific amplification polymorphism (SSAP), retrotransposon-microsatellite amplified polymorphism (REMAP) and retrotransposon-based insertion polymorphism (RBIP) approaches were applied to 182 accessions (31 Coffea species and one Psilanthus accession). Nana- and Divo-based markers revealed contrasted transpositional histories. At the BAC clone locus, RBIP results on C. canephora demonstrated that Nana insertion took place prior to C. canephora differentiation, while Divo insertion occurred after differentiation. Combined SSAP and REMAP data showed that Nana could resolve Coffea lineages, while Divo was efficient at a lower taxonomic level. The combined results indicated that the retrotransposon-based markers were useful in highlighting Coffea genetic diversity and the chronological pattern of speciation/differentiation events. Ongoing complete sequencing of the C. canephora genome will soon enable exhaustive identification of LTR-RTN families, as well as more precise in-depth analyses on contributions to genome size variation and Coffea evolution. © 2011 Springer-Verlag. |
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IRD, UMR DIADE, BP 50172, Sainte Clotilde Cedex, La Réunion 97492, France |
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16174615 (Issn) |
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Export Date: 21 October 2011; Source: Scopus; Coden: Mggoa; doi: 10.1007/s00438-011-0617-0; PubMed ID: 21505885; Language of Original Document: English; Correspondence Address: Hamon, P.; IRD, UMR DIADE, BP 64501, Montpellier Cedex 5, France; email: perla.hamon@ird.fr; Molecular Sequence Numbers: GENBANK: DV666936, HM755952, HM755953;; Chemicals/CAS: Retroelements |
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EcoFoG @ webmaster @ |
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344 |
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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 |
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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 |
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1 |
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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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EcoFoG @ eric.marcon @ |
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114 |
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Malé, P.-J.G.; Leroy, C.; Dejean, A.; Quilichini, A.; Orivel, J. |
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Title |
An ant symbiont directly and indirectly limits its host plant's reproductive success |
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Journal Article |
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Year |
2012 |
Publication |
Evolutionary Ecology |
Abbreviated Journal |
Evol. Ecol. |
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Volume |
26 |
Issue |
1 |
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55-63 |
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Cheater; Evolutionary conflict; Mutualism breakdown; Myrmecophyte; Pollination |
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In theory, mutualisms are intrinsically unstable, and the search for the maximum profit at the minimum cost should lead every mutualist to become a parasite. From an empirical point of view, mutualisms are ubiquitous and of major importance to ecosystems, suggesting the existence of mechanisms that enhance the maintenance of such relationships. We focused on the obligatory myrmecophytic association between the Neotropical plant Hirtella physophora (Chrysobalanaceae) and the ant Allomerus decemarticulatus (Myrmicinae). The plant shelters the ants in leaf pouches in exchange for protection from phytophagous insects. We experimentally demonstrated that the ants partially castrate their host plant by destroying almost two-thirds of its floral buds. The ants also impede pollination through their presence and interactions with pollinators. These results reveal that ant activity negatively affects the plant's reproduction both directly and indirectly. This dual negative effect does not result in the complete castration of the plant. We also highlight major limitations to plant reproduction due to the spontaneous abscission of flowers and to the limited quantity and/or poor quality of the pollen. These limitations must not be overlooked since they can alter the outcome of the association of H. physophora with its ant partner. We therefore conclude that the evolutionary fate of the relationship depends on both ant castration intensity and obstacles to plant fertilization not related to the presence of ants. © 2011 Springer Science+Business Media B.V. |
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Jardin Botanique Henri Gaussen, 39 Allées Jules Guesde, 31062 Toulouse, France |
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02697653 (Issn) |
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Export Date: 2 January 2012; Source: Scopus; Coden: Evece; doi: 10.1007/s10682-011-9485-7; Language of Original Document: English; Correspondence Address: Malé, P.-J. G.; CNRS, EDB (Laboratoire Evolution et Diversité Biologique), UMR 5174, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 9, France; email: pjmale@cict.fr |
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EcoFoG @ webmaster @ |
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377 |
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Hamadi, A.; Borderies, P.; Albinet, C.; Koleck, T.; Villard, L.; Ho Tong Minh, D.; Le Toan, T.; Burban, B. |
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Title |
Temporal coherence of tropical forests at P-band: Dry and rainy seasons |
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Journal Article |
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2015 |
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IEEE Geoscience and Remote Sensing Letters |
Abbreviated Journal |
IEEE Geosci. Remote Sens. Lett. |
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12 |
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3 |
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557-561 |
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Biomass mission; forest scattering; ground-based experiment; P-band; range impulse response; temporal coherence |
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In this letter, the temporal coherence of tropical forest scattering at P-band is addressed by means of a ground-based experiment. The study is based on the TropiScat campaign in French Guiana, designed to support the Biomass mission, which will be the ESA 7th Earth Explorer mission. For Biomass, temporal coherence is a crucial parameter for coherent processing of polarimetric synthetic aperture radar (SAR) interferometry and SAR tomography in repeat-pass acquisitions. During the experiment, data were continuously collected for six months during both the rainy and dry seasons. For the rain-free days in both seasons, the coherence exhibits a daily cycle showing a high decorrelation during daytime, which is likely due to motion in the canopy. Up to a 20-day baseline, the coherence is much higher in the dry season than in the rainy season (> 0.8). From 20 to 40 days, it presents the same order of magnitude in both seasons [0.6, 0.7]. For larger temporal baselines, it becomes lower in the dry season. The results can be used to assess the long-term coherence of repeat-pass observations over a tropical forest. However, an extension of this study to several years and over other forest spots would be necessary to draw more general conclusions. |
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EcoFogKourou, France |
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Institute of Electrical and Electronics Engineers Inc. |
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1545598x (Issn) |
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Export Date: 21 October 2014; Correspondence Address: Hamadi, A.; Centre d'Etudes Spatiales de la BiosphèreFrance; Funding Details: ESA, European Space Agency |
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EcoFoG @ webmaster @ |
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563 |
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Mahoui,Sihem ; Moulay, Mohamed Said ; Omrane, Abdennebi |
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Finite element approach to linear parabolic pointwise control problems of incomplete data |
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2020 |
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International Journal of Systems Science |
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51 |
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14 |
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2597-2609 |
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Optimal control problem ; low-regret control ; pointwise control ; finite element method ; a priori error estimates |
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In this paper we give a priori error estimates for finite element approximations of linear parabolicproblems with pointwise control and incomplete data. We discretise the optimal control problemby using piecewise linear and continuous finite elements for the space discretisation of the state,and we use the backward Euler scheme for time discretisation. We prove a priori error estimates forthe state, the adjoint-state as well as for the low-regret pointwise optimal control. |
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TAYLOR & FRANCIS LTD |
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EcoFoG @ webmaster @ |
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935 |
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Veron, V.; Caron, H.; Degen, B. |
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Gene flow and mating system of the tropical tree Sextonia rubra |
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Journal Article |
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2005 |
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Silvae Genetica |
Abbreviated Journal |
Silvae Genet. |
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54 |
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6 |
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275-280 |
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genetic diversity; gene flow; heterozygosity; microsatellites; mixed mating; tropical tree; twogener |
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In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site “Paracou” in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a:small proportion. of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was (Phi(FT) = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha. |
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INRA, UMR, ECOFOG, Kourou 9738, French Guiana, Email: b.degen@holz.uni-hamburg.de |
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J D SAUERLANDERS VERLAG |
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0037-5349 |
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ISI:000235239400005 |
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EcoFoG @ eric.marcon @ |
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182 |
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Barabe, D.; Lacroix, C.; Gibernau, M. |
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Floral development of Urospatha: merosity and phylogeny in the Lasioideae (Araceae) |
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Journal Article |
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2011 |
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Plant Systematics and Evolution |
Abbreviated Journal |
Plant Syst. Evol. |
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296 |
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1-2 |
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41-50 |
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Inflorescence; Homeosis; Angiosperms; Systematic; Morphogenetic constraints |
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In this paper we study merosity in the genus Urospatha within the framework of a resolved phylogeny of the Araceae. We analyse how a transition from dimerous or tetramerous merosity to pentamerous or hexamerous merosity can occur developmentally in the Lasioideae. In Urospatha, initiation of floral primordia along the inflorescence is acropetal, while development of flowers is basipetal. This indicates the presence of two distinct phases in the development of the Urospatha inflorescence. The first phase corresponds to initiation of flowers and establishment of the phyllotactic pattern, and the second phase to differentiation of floral organs. Urospatha is characterized by the presence of trimerous, tetramerous, pentamerous and rarely hexamerous flowers. In all types of flowers, the stamens are closely associated and opposite to the tepals. Pentamerous flowers are formed by addition of a sector comprising a stamen and tepal. Likewise, in the case of hexamerous flowers, two sectors are added. In the Lasioideae, the increase in the number of tepals and stamens is linked with two developmental processes that have appeared independently in the subfamily: (1) addition of one or two stamen-petal sectors (Anaphyllopsis and Urospatha), and (2) independent increase in the number of tepals and stamens on whorls, more or less organized and inserted in alternate position (Dracontium). Tetramerous whorls as they occur in basal Lasioideae would be homologous to two dimerous whorls from an evolutionary point of view. |
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[Barabe, D; Gibernau, M] CNRS UMR Ecol Forets Guyane 8172, F-97387 Kourou, France, Email: denis.barabe@umontreal.ca |
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Springer Wien |
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0378-2697 |
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WOS:000294201300004 |
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EcoFoG @ webmaster @ |
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338 |
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Degen, B.; Bandou, E.; Caron, H. |
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Limited pollen dispersal and biparental inbreeding in Symphonia globulifera in French Guiana |
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Journal Article |
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2004 |
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Heredity |
Abbreviated Journal |
Heredity |
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93 |
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6 |
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585-591 |
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gene flow; microsatellites; mixed mating; spatial autocorrelation; tropical tree; twogener |
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Abstract |
In this paper, we report a study of the mating system and gene flow of Symphonia globulifera, a hermaphroditic, mainly bird-pollinated tree species with a large geographic distribution in the tropical Americas and Africa. Using three microsatellites, we analysed 534 seeds of 28 open pollinated families and 164 adults at the experimental site 'Paracou' in French Guiana. We observed, compared to other tropical tree species, relatively high values for the effective number of alleles. Significant spatial genetic structure was detected, with trees at distances up to 150 m more genetically similar than expected at random. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t(m), was 0.920. A significant level of biparental inbreeding and a high proportion of full-sibs were estimated for the 28 seed arrays. We estimated mean pollen dispersal distances between 27 and 53 m according to the dispersal models used. Although the adult population density of S. globulifera in Paracou was relatively high, the joint estimation of pollen dispersal and density of reproductive trees gave effective density estimates of 1.6 and 1.3 trees/ha. The parameters of the mating system and gene flow are discussed in the context of spatial genetic and demographic structures, flowering phenology and pollinator composition and behaviour. |
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BFH, Inst Forest Genet & Forest Tree Breeding, D-22927 Grosshansdorf, Germany, Email: b.degen@holz.uni-hamburg.de |
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NATURE PUBLISHING GROUP |
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0018-067X |
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ISI:000225354800009 |
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EcoFoG @ eric.marcon @ |
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259 |
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