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| Author |
Michalet, S.; Rohr, J.; Warshan, D.; Bardon, C.; Roggy, J.-C.; Domenach, A.-M.; Czarnes, S.; Pommier, T.; Combourieu, B.; Guillaumaud, N.; Bellvert, F.; Comte, G.; Poly, F. |
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Phytochemical analysis of mature tree root exudates in situ and their role in shaping soil microbial communities in relation to tree N-acquisition strategy |
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Journal Article |
| Year |
2013 |
Publication |
Plant Physiology and Biochemistry |
Abbreviated Journal |
Plant Physiol. Biochem. |
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72 |
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169-177 |
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Chemical ecology; Denitrification; Eperua falcata; Metabolic profiling; Mycorrhizae; Plant-microbes interactions; Root exudates |
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Eperua falcata (Aublet), a late-successional species in tropical rainforest and one of the most abundant tree in French Guiana, has developed an original strategy concerning N-acquisition by largely preferring nitrate, rather than ammonium (H. Schimann, S. Ponton, S. Hättenschwiler, B. Ferry, R. Lensi, A.M. Domenach, J.C. Roggy, Differing nitrogen use strategies of two tropical rainforest tree species in French Guiana: evidence from 15N natural abundance and microbial activities, Soil Biol. Biochem. 40 (2008) 487-494). Given the preference of this species for nitrate, we hypothesized that root exudates would promote nitrate availability by (a) enhancing nitrate production by stimulating ammonium oxidation or (b) minimizing nitrate losses by inhibiting denitrification.Root exudates were collected in situ in monospecific planted plots. The phytochemical analysis of these exudates and of several of their corresponding root extracts was achieved using UHPLC/DAD/ESI-QTOF and allowed the identification of diverse secondary metabolites belonging to the flavonoid family.Our results show that (i) the distinct exudation patterns observed are related to distinct root morphologies, and this was associated with a shift in the root flavonoid content, (ii) a root extract representative of the diverse compounds detected in roots showed a significant and selective metabolic inhibition of isolated denitrifiers invitro, and (iii) in soil plots the abundance of nirK-type denitrifiers was negatively affected in rhizosphere soil compared to bulk. Altogether this led us to formulate hypothesis concerning the ecological role of the identified compounds in relation to N-acquisition strategy of this species. © 2013 Elsevier Masson SAS. |
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SOLICAZ, c/o Guyane Technopole 16 bis rue du 14 Juillet, 97300 Cayenne, French Guiana |
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09819428 (Issn) |
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Export Date: 15 November 2013; Source: Scopus; Coden: Ppbie; doi: 10.1016/j.plaphy.2013.05.003; Language of Original Document: English; Correspondence Address: Michalet, S.; Université Lyon1, CNRS, UMR5557, INRA, USC1364, Ecologie Microbienne, Centre d'Etude des Substances Naturelles, Pavillon Nétien, ISPB, 8 Avenue Rockefeller, 69373 Lyon cedex, France; email: sergemichalet@yahoo.fr |
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EcoFoG @ webmaster @ |
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509 |
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Scotti, I.; Montaigne, W.; Cseke, K.; Traissac, S. |
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Life after disturbance (II): the intermediate disturbance hypothesis explains genetic variation in forest gaps dominated by Virola michelii Heckel (Myristicaceae) |
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Journal Article |
| Year |
2015 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Annals of Forest Science |
| Volume |
72 |
Issue |
8 |
Pages |
1035-1042 |
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Amazon; Bayesian clustering; Demogenetics; Guiana shield; Parentage analysis; Regeneration; Spatial genetic structure; Tropical rainforest |
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Key message: Genetic diversity appears to be unaffected by disturbance in a stand of the light-demanding Neotropical treeV. michelii. Although spatial genetic structure is modified in post-disturbance cohorts, mixing of seeds from different mother trees in canopy gaps appears to efficiently maintain genetic admixture. Context: The interplay between genetic and demographic processes has major consequences on population viability. Population size affects demographic trends, while genetic diversity insures viability by reducing risks of inbreeding depression and by maintaining adaptive potential. Yet, the consequences of increases in census size (as opposed to effective size) on genetic diversity of forest populations are poorly known. Aims: We have studied the structure of genetic diversity in populations of saplings of the light-responsive tree, Virola michelii (Myristicaceae, the nutmeg family), in two plots having undergone different levels of canopy-gap opening disturbance. This allowed us to test the “intermediate disturbance” hypothesis, which generally applies to species diversity, at the intra-specific scale. Methods: Levels and distribution of genetic diversity were compared between plots and between life stages. Sapling parentage was analysed to infer each adult tree’s contribution to regeneration. Results: Genetic diversity was higher, and spatial genetic structure was stronger in the post-disturbance than in the control seedling population. Parentage analysis suggested that a limited number of parents contributed to most of the regeneration, but that efficient mixing of their progeny may have enhanced the diversity of saplings occupying canopy gaps. Conclusion: A mixture of demo-genetic processes may contribute to maintain genetic diversity in spite of, or possibly due to, ecosystem disturbance in V. michelii. © 2015, INRA and Springer-Verlag France. |
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Solicaz, Guyane Technopôle, 16 bis Rue du 14 Juillet, Cayenne, French Guiana |
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Export Date: 14 December 2015 |
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EcoFoG @ webmaster @ |
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642 |
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Nirma, C.; Eparvier, V.; Stien, D. |
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Reactivation of antibiosis in the entomogenous fungus Chrysoporthe sp. SNB-CN74 |
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Journal Article |
| Year |
2015 |
Publication |
Journal of Antibiotics |
Abbreviated Journal |
Journal of Antibiotics |
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68 |
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9 |
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586-590 |
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Chrysoporthe sp. SNB-CN74 was isolated from a Nasutitermes corniger nest, and its ethyl acetate extract was found to exhibit very strong antibacterial activity. Two antibacterial metabolites were isolated, (-)-R-skyrin (2) and (+)-rugulosin A (3). Eventually, the fungus lost its antibiotic potential when subcultured, and the use of yeast extract induced the re-expression of these two antibiotics. Yeast extract possibly activated a cryptic pathway by mimicking the presence of an ecological competitor. © 2015 Japan Antibiotics Research Association All rights reserved. |
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Sorbonne Universités, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls-sur-mer, France |
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Export Date: 12 October 2015 |
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EcoFoG @ webmaster @ |
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628 |
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Odonne, G.; Houel, E.; Bourdy, G.; Stien, D. |
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Treating leishmaniasis in Amazonia: A review of ethnomedicinal concepts and pharmaco-chemical analysis of traditional treatments to inspire modern phytotherapies |
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Journal Article |
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2017 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
Journal of Ethnopharmacology |
| Volume |
199 |
Issue |
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Pages |
211-230 |
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Amazonia; Distribution indexes; Ethnomedecine; Interculturality; Leishmaniasis; Medicinal plants; Traditional medicine |
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Ethnopharmacological relevance Cutaneous and mucocutaneous leishmaniasis are neglected tropical diseases that occur in all intertropical regions of the world. Amazonian populations have developed an abundant knowledge of the disease and its remedies. Therefore, we undertook to review traditional antileishmanial plants in Amazonia and have developed new tools to analyze this somewhat dispersed information. Material and methods A literature review of traditional remedies for cutaneous/mucocutaneous leishmaniasis in the Amazon was conducted and the data obtained was used to calculate distribution indexes designed to highlight the most relevant uses in Amazonia. The cultural distribution index represents the distribution rate of a given taxon among different cultural groups and was calculated as the ratio of the number of groups using the taxon to the total number of groups cited. The geographical distribution index allowed us to quantify spatial distribution of a taxon's uses in Amazonia and was calculated geometrically by measuring the average distance between the points where uses have been reported and the barycenter of those points. The general distribution index was defined as an arithmetic combination of the previous two and provides information on both cultural and spatial criteria. Results 475 use reports, concerning 291 botanical species belonging to 83 families have been gathered depicted from 29 sources. Uses concern 34 cultural groups. While the use of some taxa appears to be Pan-Amazonian, some others are clearly restricted to small geographical regions. Particular attention has been paid to the recipes and beliefs surrounding treatments. Topical application of the remedies dominated the other means of administration and this deserves particular attention as the main treatments against Neotropical leishmaniasis are painful systemic injections. The data set was analyzed using the previously defined distribution indexes and the most relevant taxa were further discussed from a phytochemical and pharmacological point of view. Conclusions The Amazonian biodiversity and cultural heritage host a fantastic amount of data whose systematic investigation should allow a better large-scale understanding of the dynamics of traditional therapies and the consequent discovery of therapeutic solutions for neglected diseases. Distribution indices are indeed powerful tools for emphasizing the most relevant treatments against a given disease and should be very useful in the meta-analysis of other regional pharmacopeia. This focus on renowned remedies that have not yet benefitted from extended laboratory studies, could stimulate future research on new treatments of natural origin for leishmaniasis. © 2017 Elsevier Ireland Ltd |
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Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls-sur-Mer, France |
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Export Date: 27 February 2017 |
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EcoFoG @ webmaster @ |
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737 |
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Houel, E.; Nardella, F.; Jullian, V.; Valentin, A.; Vonthron-Sénécheau, C.; Villa, P.; Obrecht, A.; Kaiser, M.; Bourreau, E.; Odonne, G.; Fleury, M.; Bourdy, G.; Eparvier, V.; Deharo, E.; Stien, D. |
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Wayanin and guaijaverin, two active metabolites found in a Psidium acutangulum Mart. ex DC (syn. P. persoonii McVaugh) (Myrtaceae) antimalarial decoction from the Wayana Amerindians |
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Journal Article |
| Year |
2016 |
Publication |
Journal of Ethnopharmacology |
Abbreviated Journal |
Journal of Ethnopharmacology |
| Volume |
187 |
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241-248 |
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Antimalarial; Cytokines; French guiana; Glycosylated flavonols; Psidium acutangulum; Traditional remedy |
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Ethnopharmacological relevance Psidium acutangulum Mart. ex DC is a small tree used by the Wayana Amerindians from the Upper-Maroni in French Guiana for the treatment of malaria. Aim of the study In a previous study, we highlighted the in vitro antiplasmodial, antioxidant and anti-inflammatory potential of the traditional decoction of P. acutangulum aerial parts. Our goal was then to investigate on the origin of the biological activity of the traditional remedy, and eventually characterize active constituents. Materials and methods Liquid-liquid extractions were performed on the decoction, and the antiplasmodial activity evaluated against chloroquine-resistant FcB1 ([3H]-hypoxanthine bioassay) and 7G8 (pLDH bioassay) P. falciparum strains, and on a chloroquine sensitive NF54 ([3H]-hypoxanthine bioassay) P. falciparum strain. The ethyl acetate fraction (D) was active and underwent bioguided fractionation. All the isolated compounds were tested on P. falciparum FcB1 strain. In vitro anti-inflammatory activity (IL-1β, IL-6, IL-8, TNFα) of the ethyl acetate fraction and of an anti-Plasmodium active compound, was concurrently assessed on LPS-stimulated human PBMC and NO secretion inhibition was measured on LPS stimulated RAW murine macrophages. Cytotoxicity of the fractions and pure compounds was measured on VERO cells, L6 mammalian cells, PBMCs, and RAW cells. Results Fractionation of the ethyl acetate soluble fraction (IC50 ranging from 3.4 to <1 μg/mL depending on the parasite strain) led to the isolation of six pure compounds: catechin and five glycosylated quercetin derivatives. These compounds have never been isolated from this plant species. Two of these compounds (wayanin and guaijaverin) were found to be moderately active against P. falciparum FcB1 in vitro (IC50 5.5 and 6.9 μM respectively). We proposed the name wayanin during public meetings organized in June 2015 in the Upper-Maroni villages, in homage to the medicinal knowledge of the Wayana population. At 50 μg/mL, the ethyl acetate fraction (D) significantly inhibited IL-1β secretion (-46%) and NO production (-21%), as previously observed for the decoction. The effects of D and guiajaverin (4) on the secretion of other cytokines or NO production were not significant. Conclusions The confirmed antiplasmodial activity of the ethyl acetate soluble fraction of the decoction and of the isolated compounds support the previous results obtained on the P. acutangulum decoction. The antiplasmodial activity might be due to a mixture of moderately active non-toxic flavonoids. The anti-inflammatory activities were less marked for ethyl acetate fraction (D) than for the decoction. © 2016 Elsevier Ireland Ltd. All rights reserved. |
| Address |
Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls/Mer, France |
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Export Date: 20 May 2016 |
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EcoFoG @ webmaster @ |
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679 |
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Falkowski, M.; Jahn-Oyac, A.; Ferrero, E.; Issaly, J.; Eparvier, V.; Girod, R.; Rodrigues, A.M.S.; Stien, D.; Houel, E.; Dusfour, I. |
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Assessment of A Simple Compound-Saving Method to Study Insecticidal Activity of Natural Extracts and Pure Compounds Against Mosquito Larvae |
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Journal Article |
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2016 |
Publication |
Journal of the American Mosquito Control Association |
Abbreviated Journal |
Journal of the American Mosquito Control Association |
| Volume |
32 |
Issue |
4 |
Pages |
337-340 |
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Mosquitoes; natural insecticides; screening method |
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Research on natural insecticides has intensified with the spread of resistance to chemicals among insects, particularly disease vectors. To evaluate compounds, the World Health Organization (WHO) has published standardized procedures. However, those may be excessively compound-consuming when it comes to assessing the activity of natural extracts and pure compounds isolated in limited amount. As part of our work on the discovery of new mosquito larvicides from Amazonian plants, we developed a compound-saving assay in 5-ml glass tubes instead of WHO larval 100-ml cups. Comparing activity of synthetic and natural chemicals validated the glass tube assay. Raw data, lethal doses that kill 50% (LD50) and 90% (LD90) at 24 and 48 h, were highly correlated (0.68 < R2 < 0.96, P < 0.001, Pearson test) between cups and tubes. It was also established that 10 tubes (N = 50 larvae) provided the same level of sensitivity as 20 tubes (N = 100). This method proved suitable for rapid screening of natural extracts and molecules, identifying active compounds using 10 times less material than in the WHO protocol. © 2016 by The American Mosquito Control Association, Inc. |
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Sorbonne Universites, UPMC, Universite Paris 06, CNRS, Laboratoire de Biodiversite et Biotechnologies Microbiennes (USR 3579, LBBM), Observatoire Oceanologique, avenue de Fontaul e, Banyuls/Mer-sur-mer, France |
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Export Date: 3 March 2017 |
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EcoFoG @ webmaster @ |
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740 |
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Hofman, M.P.; Hayward, M.W.; Heim, M.; Marchand, P.; Rolandsen, C.M.; Mattisson, J.; Urbano, F.; Heurich, M.; Mysterud, A.; Melzheimer, J.; Morellet, N.; Voigt, U.; Allen, B.L.; Gehr, B.; Rouco, C.; Ullmann, W.; Holand, Ø.; Jørgensen, N.H.; Steinheim, G.; Cagnacci, F.; Kroeschel, M.; Kaczensky, P.; Buuveibaatar, B.; Payne, J.C.; Palmegiani, I.; Jerina, K.; Kjellander, P.; Johansson, Ö.; LaPoint, S.; Bayrakcismith, R.; Linnell, J.D.C.; Zaccaroni, M.; Jorge, M.L.S.; Oshima, J.E.F.; Songhurst, A.; Fischer, C.; Mc Bride, R.T., Jr.; Thompson, J.J.; Streif, S.; Sandfort, R.; Bonenfant, C.; Drouilly, M.; Klapproth, M.; Zinner, D.; Yarnell, R.; Stronza, A.; Wilmott, L.; Meisingset, E.; Thaker, M.; Vanak, A.T.; Nicoloso, S.; Graeber, R.; Said, S.; Boudreau, M.R.; Devlin, A.; Hoogesteijn, R.; May-Junior, J.A.; Nifong, J.C.; Odden, J.; Quigley, H.B.; Tortato, F.; Parker, D.M.; Caso, A.; Perrine, J.; Tellaeche, C.; Zieba, F.; Zwijacz-Kozica, T.; Appel, C.L.; Axsom, I.; Bean, W.T.; Cristescu, B.; Périquet, S.; Teichman, K.J.; Karpanty, S.; Licoppe, A.; Menges, V.; Black, K.; Scheppers, T.L.; Schai-Braun, S.C.; Azevedo, F.C.; Lemos, F.G.; Payne, A.; Swanepoel, L.H.; Weckworth, B.V.; Berger, A.; Bertassoni, A.; McCulloch, G.; Sustr, P.; Athreya, V.; Bockmuhl, D.; Casaer, J.; Ekori, A.; Melovski, D.; Richard-Hansen, C.; Van De Vyver, D.; Reyna-Hurtado, R.; Robardet, E.; Selva, N.; Sergiel, A.; Farhadinia, M.S.; Sunde, P.; Portas, R.; Ambarli, H.; Berzins, R.; Kappeler, P.M.; Mann, G.K.; Pyritz, L.; Bissett, C.; Grant, T.; Steinmetz, R.; Swedell, L.; Welch, R.J.; Armenteras, D.; Bidder, O.R.; González, T.M.; Rosenblatt, A.; Kachel, S.; Balkenhol, N. |
| Title |
Right on track? Performance of satellite telemetry in terrestrial wildlife research |
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Journal Article |
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2019 |
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PLoS One |
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14 |
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5 |
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e0216223 |
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article; nonhuman; telemetry; terrestrial species; wildlife |
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Satellite telemetry is an increasingly utilized technology in wildlife research, and current devices can track individual animal movements at unprecedented spatial and temporal resolutions. However, as we enter the golden age of satellite telemetry, we need an in-depth understanding of the main technological, species-specific and environmental factors that determine the success and failure of satellite tracking devices across species and habitats. Here, we assess the relative influence of such factors on the ability of satellite telemetry units to provide the expected amount and quality of data by analyzing data from over 3,000 devices deployed on 62 terrestrial species in 167 projects worldwide. We evaluate the success rate in obtaining GPS fixes as well as in transferring these fixes to the user and we evaluate failure rates. Average fix success and data transfer rates were high and were generally better predicted by species and unit characteristics, while environmental characteristics influenced the variability of performance. However, 48% of the unit deployments ended prematurely, half of them due to technical failure. Nonetheless, this study shows that the performance of satellite telemetry applications has shown improvements over time, and based on our findings, we provide further recommendations for both users and manufacturers. |
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South African National Parks, Scientific Services, Kimberley, South Africa |
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Public Library of Science |
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EcoFoG @ webmaster @ |
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874 |
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Seipke, R.F.; Barke, J.; Ruiz-Gonzalez, M.X.; Orivel, J.; Yu, D.W.; Hutchings, M.I. |
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Fungus-growing Allomerus ants are associated with antibiotic-producing actinobacteria |
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Journal Article |
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2012 |
Publication |
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology |
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Antonie Van Leeuwenhoek Int. J. Gen. Mol. Microbiol. |
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101 |
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2 |
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443-447 |
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Allomerus ants; Amycolatopsis; Ant-bacteria symbioses; Fungus-growing ants; Insect fungiculture; Streptomyces |
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Fungus-growing attine ants use natural-product antibiotics produced by mutualist actinobacteria as 'weedkillers' in their fungal gardens. Here we report for the first time that fungus-growing Allomerus ants, which lie outside the tribe Attini, are associated with antifungal-producing actinobacteria, which offer them protection against non-cultivar fungi isolated from their ant-plants. © 2011 Springer Science+Business Media B.V. |
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State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, China |
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Export Date: 21 March 2012; Source: Scopus; Coden: Aljma; doi: 10.1007/s10482-011-9621-y; Language of Original Document: English; Correspondence Address: Hutchings, M.I.; School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom; email: m.hutchings@uea.ac.uk |
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385 |
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Gao, H.; Grüschow, S.; Barke, J.; Seipke, R.F.; Hill, L.M.; Orivel, J.; Yu, D.W.; Hutchings, M.; Goss, R.J.M. |
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Filipins: The first antifungal “weed killers” identified from bacteria isolated from the trap-ant |
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Journal Article |
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2014 |
Publication |
RSC Advances |
Abbreviated Journal |
RSC Adv. |
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4 |
Issue |
100 |
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57267-57270 |
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Anti-fungal |
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Allomerus ants ensure that they have sufficient nitrogen in their diet by trapping and consuming other insects. In order to construct their traps, like the more extensively studied leaf cutter ants, they employ fungal farming. Pest management within these fungal cultures has been speculated to be due to the ants' usage of actinomycetes capable of producing antifungal compounds, analogous to the leafcutter ant mutualism. Here we report the first identification of a series of antifungal compounds, the filipins, and their associated biosynthetic genes isolated from a bacterium associated with this system. |
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State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of ZoologyKunming, Yunnan, China |
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Royal Society of Chemistry |
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Export Date: 20 November 2014; Coden: Rscac; Correspondence Address: Goss, R.J.M.; School of Chemistry, University of St. AndrewsUnited Kingdom; Funding Details: 311848, EC, European Commission |
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567 |
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Courtois, E.A.; Baraloto, C.; Timothy Paine, C.E.; Petronelli, P.; Blandinieres, P.-A.; Stien, D.; Houel, E.; Bessiere, J.-M.; Chave, J. |
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Differences in volatile terpene composition between the bark and leaves of tropical tree species |
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Journal Article |
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2012 |
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Phytochemistry |
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Phytochemistry |
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82 |
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81-88 |
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French Guiana; Herbivory; Optimal defense theory; Secondary metabolites; Wood |
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Volatile terpenes are among the most diverse class of defensive compounds in plants, and they are implicated in both direct and indirect defense against herbivores. In terpenes, both the quantity and the diversity of compounds appear to increase the efficiency of defense as a diverse blend of compounds provides a more efficient protection against a broader range of herbivores and limits the chances that an enemy evolves resistance. Theory predicts that plant defensive compounds should be allocated differentially among tissues according to the value of the tissue, its cost of construction and the herbivore pressure on it. We collected volatile terpenes from bark and leaves of 178 individual tree belonging to 55 angiosperm species in French Guiana and compare the kind, amount, and diversity of compounds in these tissues. We hypothesized that in woody plants, the outermost part of the trunk should hold a more diverse blend of volatile terpenes. Additionally, as herbivore communities associated with the leaves is different to the one associated with the bark, we also hypothesized that terpene blends should be distinct in the bark vs. the leaves of a given species. We found that the mixture of volatile terpenes released by bark is different and more diverse than that released by leaves, both in monoterpenes and sesquiterpenes. This supports our hypothesis and further suggests that the emission of terpenes by the bark should be more important for trunk defense than previously thought. |
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Station d'Écologie Expérimentale du CNRS Moulis, USR 2936, 2 route du CNRS, 09200 Moulis, France |
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00319422 (Issn) |
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Export Date: 4 September 2012; Source: Scopus; Coden: Pytca; doi: 10.1016/j.phytochem.2012.07.003; Language of Original Document: English; Correspondence Address: Courtois, E.A.; Station d'Écologie Expérimentale du CNRS Moulis, USR 2936, 2 route du CNRS, 09200 Moulis, France; email: courtoiselodie@gmail.com |
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