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Orivel, J.; Lambs, L.; Male, P.J.G.; Leroy, C.; Grangier, J.; Otto, T.; Quilichini, A.; Dejean, A. |
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Title |
Dynamics of the association between a long-lived understory myrmecophyte and its specific associated ants |
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Journal Article |
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Year |
2011 |
Publication |
Oecologia |
Abbreviated Journal |
Oecologia |
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Volume |
165 |
Issue |
2 |
Pages |
369-376 |
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Keywords |
Allomerus decemarticulatus; Hirtella physophora; Lifespan; Mutualism; Myrmecophyte |
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Abstract |
Myrmecophytic symbioses are widespread in tropical ecosystems and their diversity makes them useful tools for understanding the origin and evolution of mutualisms. Obligate ant-plants, or myrmecophytes, provide a nesting place, and, often, food to a limited number of plant-ant species. In exchange, plant-ants protect their host plants from herbivores, competitors and pathogens, and can provide them with nutrients. Although most studies to date have highlighted a similar global pattern of interactions in these systems, little is known about the temporal structuring and dynamics of most of these associations. In this study we focused on the association between the understory myrmecophyte Hirtella physophora (Chrysobalanaceae) and its obligate ant partner Allomerus decemarticulatus (Myrmicinae). An examination of the life histories and growth rates of both partners demonstrated that this plant species has a much longer lifespan (up to about 350 years) than its associated ant colonies (up to about 21 years). The size of the ant colonies and their reproductive success were strongly limited by the available nesting space provided by the host plants. Moreover, the resident ants positively affected the vegetative growth of their host plant, but had a negative effect on its reproduction by reducing the number of flowers and fruits by more than 50%. Altogether our results are important to understanding the evolutionary dynamics of ant-plant symbioses. The highly specialized interaction between long-lived plants and ants with a shorter lifespan produces an asymmetry in the evolutionary rates of the interaction which, in return, can affect the degree to which the interests of the two partners converge. |
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[Orivel, Jerome; Leroy, Celine; Quilichini, Angelique; Dejean, Alain] CNRS, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf |
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0029-8549 |
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ISI:000286224900012 |
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EcoFoG @ webmaster @ |
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295 |
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Orivel, J.; Grangier, J.; Foucaud, J.; Le Breton, J.; Andres, F.X.; Jourdan, H.; Delabie, J.H.C.; Fournier, D.; Cerdan, P.; Facon, B.; Estoup, A.; Dejean, A. |
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Title |
Ecologically heterogeneous populations of the invasive ant Wasmannia auropunctata within its native and introduced ranges |
Type |
Journal Article |
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Year |
2009 |
Publication |
Ecological Entomology |
Abbreviated Journal |
Ecol. Entomol. |
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Volume |
34 |
Issue |
4 |
Pages |
504-512 |
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Keywords |
Biological invasion; disturbance; ecological traits; native; Wasmannia auropunctata |
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1. The biology of most invasive species in their native geographical areas remains largely unknown. Such studies are, however, crucial in shedding light on the ecological and evolutionary processes underlying biological invasions. 2. The present study focuses on the little fire ant Wasmannia auropunctata, a species native to Central and South America that has been widely introduced and which has become invasive throughout the tropics. We characterise and compare several ecological traits of native populations in French Guiana with those in one of its introduced ranges, New Caledonia. 3. We found ecologically heterogeneous populations of W. auropunctata coexisting in the species' native geographical area. First, we found populations restricted to naturally perturbed areas (particularly floodplains) within the primary forest, and absent from the surrounding forest areas. These populations were characterised by low nest and worker densities. Second, we found dominant populations in recent anthropogenic areas (e.g. secondary forest or forest edge along road) characterised by high nest and worker densities, and associated with low ant species richness. The local dominance of W. auropunctata in such areas can be due to the displacement of other species (cause) or the filling-up of empty habitats unsuitable to other ants (effect). With respect to their demographic features and ant species richness, the populations of native anthropogenic habitats were to a large extent similar to the invasive populations introduced into remote areas. 4. The results point to the need for greater research efforts to better understand the ecological and demographic features of invasive species within their native ranges. |
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[Orivel, Jerome; Grangier, Julien; Le Breton, Julien] Univ Toulouse 3, Lab Evolut & Divers Biol, CNRS, UMR 5174, F-31062 Toulouse 9, France, Email: orivel@cict.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0307-6946 |
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ISI:000267659900010 |
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EcoFoG @ eric.marcon @ |
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202 |
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Odonne, G.; Bourdy, G.; Castillo, D.; Estevez, Y.; Lancha-Tangoa, A.; Alban-Castillo, J.; Deharo, E.; Rojas, R.; Stien, D.; Sauvain, M. |
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Title |
Ta'ta', Huayani: Perception of leishmaniasis and evaluation of medicinal plants used by the Chayahuita in Peru. Part II |
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Journal Article |
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Year |
2009 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
J. Ethnopharmacol. |
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Volume |
126 |
Issue |
1 |
Pages |
149-158 |
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Keywords |
Leishmaniasis; Medicinal plants; Traditional medicine; Chayahuita; Peru |
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Abstract |
Aim of the study v: A knowledge attitude and practice study centred on leishmaniasis and its treatment was performed among the Chayahuita, in Amazonian Peruvian ethnic group living in ail endemic area. This study documents traditional Chayahuita plant's use and disease concepts. Also, activity of some medicinal Plants Used by the Chayahuita is highlighted and discussed. Materials and methods: Ninety-three Chayahuita people were interviewed, following a semi-structured questionnaire focussed oil disease knowledge and perception, personal attitude and healing practices. Simultaneously, a collection of plants was performed in different ecotopes, in order to make ail extensive inventory of the pharmacopoeia. Results: For the Chayahuita, cutaneous (CL) and muco-cutaneous leishmaniasis (MCL) are considered as diseases of their own, with specific names, aetiologics, mode of transmission. Regarding CL, Chayahuita people consider that the humid characteristic of the Skill ulcer is a discriminative fact orienting the diagnostic for Ta'ta' (leishmaniasis). Forty-six different species were designated useful against LC and /or MCL (29 species by means of the questionnaire and 27 species when collecting in different ecotopes). Thirty-seven extracts corresponding to 31 Species used medicinally were screened in vitro against Leishmania amazonensis axenic amastigotes, assessing their viability by the reduction Of tetrazolium salt (MTT). Six species displayed a good activity (10 μg/ml < IC50 < 20 μg/ml): all undetermined hemi-epiphytic Clusiaceae. Cybianthus anthuriophyllus Pipoly (Myrsinaceae), two Piper, Piper sanguineispicum Trel., and Piper loretoanum Trel. (Piperaceae), Desmodium axillare Sw. DC. (Fabaceae), and Clibadium sylvestre (Aubl.) Baill (Asteraceae). Conclusion: Perception of leishmaniasis, attitude. treatments and diet prohibitions still largely reflects traditional Chayahuita cosmovision, even if some tentative of bio-medical re-interpretation is arising. (C) 2009 Elsevier Ireland Ltd. All rights reserved. |
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[Odonne, G.; Bourdy, G.; Estevez, Y.; Deharo, E.; Sauvain, M.] Univ Toulouse, UPS, UMR 152, Lab Pharmacochim Subst Nat & Pharmacophores Redox, F-31062 Toulouse 9, France, Email: Genevieve.bourdy@ird.fr |
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ELSEVIER IRELAND LTD |
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0378-8741 |
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ISI:000271790800020 |
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EcoFoG @ eric.marcon @ |
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95 |
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Niamke, F.B.; Amusant, N.; Charpentier, J.P.; Chaix, G.; Baissac, Y.; Boutahar, N.; Adima, A.A.; Kati-Coulibaly, S.; Jay-Allemand, C. |
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Title |
Relationships between biochemical attributes (non-structural carbohydrates and phenolics) and natural durability against fungi in dry teak wood (Tectona grandis L. f.) |
Type |
Journal Article |
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Year |
2011 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
68 |
Issue |
1 |
Pages |
201-211 |
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Keywords |
Tectona grandis; Teak heartwood; Phenolic compound; Non-structural carbohydrate; Natural durability |
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Introduction Non-structural carbohydrates and phenolic compounds are implicated in the natural durability of wood. In order to find the chemical traits of natural durability in teak wood, the radial distribution of phenolics compounds and non-structural carbohydrates were studied in trees ranked by contrasting natural durability class against Antrodia sp. Methods Non-structural carbohydrates were analyzed by spectrophotometry after enzymatic assays and phenolics compounds using HPLC. Results High concentrations of starch, sucrose, glucose, and fructose were found in the sapwood, whereas only trace amounts were found in the heartwood. In the sapwood, low concentrations of H1 (a hydroxycinnamic acid derivative) were specifically detected. Tectoquinone was also detected in the sapwood but its content increased dramatically in the heartwood. 2-(Hydroxymethyl) anthraquinone and P1, an unidentified compound, were only detected in the heartwood and at high concentrations (>3 mg equivalent 5-methoxyflavone g(-1) dry weight. Lower concentrations of 1,4-naphthoquinone, anthraquinone-2-carboxylic acid, and lapachol were also only detected in the heartwood. H1 and tectoquinone present in the sapwood could be considered as phenolic precursors of the synthesis of heartwood toxic phenolics in the heartwood. Conclusion Correlations between natural durability and chemical composition of heartwood (quinone derivatives, P1, and non-structural carbohydrates) suggest that P1, 2-(hydroxymethyl) anthraquinone and tectoquinone could be natural durability traits. Heartwood extractives, |
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[Niamke, FB; Baissac, Y; Jay-Allemand, C] Univ Montpellier 2, F-34095 Montpellier 05, France, Email: Christian.jay-allemand@univ-montp2.fr |
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Springer France |
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1286-4560 |
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WOS:000290447600021 |
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EcoFoG @ webmaster @ |
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340 |
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Millet, J.; Pascal, J.P.; Kiet, L.C. |
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Title |
Effects of Disturbance Over 60 Years on a Lowland Forest in Southern Vietnam |
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Journal Article |
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Year |
2010 |
Publication |
Journal of Tropical Forest Science |
Abbreviated Journal |
J. Trop. For. Sci. |
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Volume |
22 |
Issue |
3 |
Pages |
237-246 |
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Keywords |
Lowland tropical forest; disturbance impact; floristic composition; forest structure; Tan Phu forest |
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MILLET J, PASCAL JP & MET LC. 2010. Effects of disturbance over 60 years on a lowland forest in southern Vietnam. Tropical lowland forests are some of the most threatened in the world and this is particularly the case in Vietnam. This study aimed to identify changes in species composition and forest structure in the Tan Phu lowland forest resulting from disturbance over a 60 year period. Analysis of forest composition and structure rely on data from 25 plots of 0.5-ha size established in a lowland secondary forest. The five forest stands described differed greatly from the three forest stand types described in 1943. Some long-lived shade-tolerant species had been replaced by pioneer species, such as Cratoxylon formosum and Shorea roxburghii. In addition to altering composition, forest disturbances had resulted in large changes in forest structure. While in the past, forest stands had a large number of exploitable trees, current forest stands have few trees in the diameter class > 50 cm and sometimes no trees in the diameter class > 80 cm. This paper provides notable results on forest tree ecology, forest dynamics and on the state of secondary forests in Vietnam. This is particularly important as future goods and services will increasingly have to come from such forests. |
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[Millet, J.] Univ Lyon 1, F-69622 Villeurbanne, France, Email: jerome.millet@ird.if |
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FOREST RESEARCH INST MALAYSIA |
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0128-1283 |
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ISI:000280653200003 |
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EcoFoG @ webmaster @ |
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283 |
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McLean, J.P.; Zhang, T.; Bardet, S.; Beauchene, J.; Thibaut, A.; Clair, B.; Thibaut, B. |
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Title |
The decreasing radial wood stiffness pattern of some tropical trees growing in the primary forest is reversed and increases when they are grown in a plantation |
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Journal Article |
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Year |
2011 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
68 |
Issue |
4 |
Pages |
681-688 |
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Keywords |
Tropical trees; Growth strategy; Wood stiffness; Juvenile wood |
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Background This study examines the radial trend in wood stiffness of tropical rainforest trees. The objective was to determine if the type of growing environment (exposed plantation or dense primary forest) would have an effect on this radial trend. Methods The axial elastic modulus of wood samples, representing a pith to bark cross-section, of six trees from several French Guianese species (two of Eperua falcata, one of Eperua grandiflora, two of Carapa procera and one of Symphonia gloubulifera) was measured using a dynamic “forced vibration” method. Results Primary forest trees were observed to have a decrease in wood stiffness from pith to bark, whereas plantation trees, from the same genus or species, displayed a corresponding increase in wood stiffness. Juvenile wood stiffness appears to vary depending on the environment in which the tree had grown. Conclusion We suggest that the growth strategy of primary forest trees is to produce wood resistant to self-buckling so that the height of the canopy may be obtained with the maximum of efficiency. In contrast, the growth strategy of the trees growing in an exposed plantation is to produce low-stiffness wood, important to provide flexibility in wind. Further experiments to study the behaviour of more species, with more individuals per species, growing across a range of physical environments, are required. |
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[McLean, JP; Bardet, S; Clair, B; Thibaut, B] Univ Montpellier 2, LMGC, CNRS, F-34095 Montpellier, France, Email: p.mclean@auckland.ac.nz |
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Springer France |
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1286-4560 |
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WOS:000292553400003 |
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EcoFoG @ webmaster @ |
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326 |
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McClure, M.; Chouteau, M.; Dejean, A. |
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Title |
Territorial aggressiveness on the arboreal ant Azteca alfari by Camponotus blandus in French Guiana due to behavioural constraints |
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Journal Article |
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Year |
2008 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
331 |
Issue |
9 |
Pages |
663-667 |
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Azteca alfari (Dolichoderinae); Camponotus blandus (Formicinae); foraging; rhythm of activity; territorial aggressiveness |
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This study reports new information on interactions between two sympatric ant species, the plant-ant Azteca alfari (Dolichoderinae) living in association with the myrmecophyte Cecropia obtusa (Cecropiaceae) and Camponotus blandus (Formicinae), a ground-nesting, arboreal-foraging species. Workers of A. alfari forage only on the foliage and the tipper parts of the trunk of their host Cecropia, while C. blandus nests in the ground but frequently forages and patrols pioneer tree foliage, including Cecropia. The activity pattern of A. alfari and the number of C. blandus on Cecropia obtusa was monitored hourly during a two-day period in a disturbed area in French Guiana. The maximum activity of C. blandus occurred between 8:30 and 12:30, at which time A. alfari had retreated within the domatia and were least present on the trunks. Even though aggressive confrontations were observed, C. blandus workers often initiate confrontations but do not prey on A. alfari nor exploit food bodies produced by Cecropia, the principal food source of A. alfari. Hence hostility appears to be the result of territoriality. Differences in their foraging rhythms are proposed as promoting resource and territory partitioning in this ant assemblage. |
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[McClure, Melanie] Concordia Univ, Dept Biol, Montreal, PQ H4B 1R6, Canada, Email: m_mcclur@alcor.concordia.ca |
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ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER |
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1631-0691 |
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ISI:000259290200004 |
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EcoFoG @ eric.marcon @ |
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130 |
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Martin, J.M.; Roux, O.; Groc, S.; Dejean, A. |
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Title |
A type of unicoloniality within the native range of the fire ant Solenopsis saevissima |
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Journal Article |
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Year |
2011 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
334 |
Issue |
4 |
Pages |
307-310 |
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Keywords |
Ants; Solenopsis saevissima; Native range; Unicoloniality |
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To determine if a type of unicoloniality exists in the fire ant Solenopsis saevissima in its native range, we conducted intraspecific aggressiveness tests in French Guiana between workers originating from 15 human-disturbed sites. We identified two “colonial groups” spread over 54 km and 12.5 km, respectively. Workers from the same group never attacked each other, but inter-group confrontations resulted in a high level of aggressiveness. These large “colonial groups” enhances the threat occasioned by S. saevissima for both agriculture and the environment. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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Address |
[Martin, Jean-Michel; Roux, Olivier; Groc, Sarah; Dejean, Alain] Ecol Forets de Guyane UMR CNRS 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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Elsevier France-Editions Scientifiques Medicales Elsevier |
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1631-0691 |
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ISI:000290364200007 |
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EcoFoG @ webmaster @ |
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314 |
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Author |
Marti, G.; Eparvier, V.; Moretti, C.; Prado, S.; Grellier, P.; Hue, N.; Thoison, O.; Delpech, B.; Gueritte, F.; Litaudon, M. |
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Title |
Antiplasmodial benzophenone derivatives from the root barks of Symphonia globulifera (Clusiaceae) |
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Journal Article |
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Year |
2010 |
Publication |
Phytochemistry |
Abbreviated Journal |
Phytochemistry |
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Volume |
71 |
Issue |
8-9 |
Pages |
964-974 |
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Keywords |
Symphonia globulifera; Clusiaceae; Benzophenone; Symphonone; Antiplasmodial; LC/ESI-MS |
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Abstract |
In an effort to find antimalarial drugs, a systematic in vitro evaluation on a chloroquine-resistant strain of Plasmodium falciparum (FcB1) was undertaken on sixty plant extracts collected in French Guiana. The ethyl acetate extract obtained from the root barks of Symphonia globulifera exhibited a strong antiplasmodial activity (97% at 10 μg/ml). The phytochemical investigation of this extract led to the isolation of nine polycyclic polyprenylated acylphloroglucinol (PPAPs) compounds and two oxidized derivatives. All compounds showed antiplasmodial activity with IC(50)s ranged from 2.1 to 10.1 μM. A LC/ESI-MSn study performed on polyprenylated benzophenones previously isolated from Moronobea coccinea provided a reliable method for their detection in the extract and structural elucidation. (C) 2010 Elsevier Ltd. All rights reserved. |
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Address |
[Marti, Guillaume; Hue, Nathalie; Thoison, Odile; Delpech, Bernard; Gueritte, Francoise; Litaudon, Marc] CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France, Email: marc.litaudon@icsn.cnrs-gif.fr |
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PERGAMON-ELSEVIER SCIENCE LTD |
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0031-9422 |
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ISI:000279077400016 |
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EcoFoG @ webmaster @ |
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284 |
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Author |
Marcon, E.; Puech, F. |
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Title |
Measures of the geographic concentration of industries: improving distance-based methods |
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Journal Article |
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Year |
2010 |
Publication |
Journal of Economic Geography |
Abbreviated Journal |
J. Econ. Geogr. |
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Volume |
10 |
Issue |
5 |
Pages |
745-762 |
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Keywords |
Geographic concentration; distance-based methods; K-density function; Ripley's K function; M function; C40; C60; R12; L60 |
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Abstract |
We discuss a property of distance-based measures that has not been addressed with regard to evaluating the geographic concentration of economic activities. The article focuses on the choice between a probability density function of point-pair distances or a cumulative function. We begin by introducing a new cumulative function, M, for evaluating the relative geographic concentration and the co-location of industries in a non-homogeneous spatial framework. Secondly, some rigorous comparisons are made with the leading probability density function of Duranton and Overman (2005), Kd. The merits of the simultaneous use of Kd and M is proved, underlining the complementary nature of the results they provide. |
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Address |
[Marcon, Eric] AgroParisTech ENGREF, UMR EcoFoG, Kourou 97310, French Guiana, Email: Florence.Puech@univ-lyon2.fr |
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Publisher |
OXFORD UNIV PRESS |
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ISSN |
1468-2702 |
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Notes |
ISI:000281183300009 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
43 |
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