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Author |
Leroy, C.; Sejalon-Delmas, N.; Jauneau, A.; Ruiz-Gonzalez, M.X.; Gryta, H.; Jargeat, P.; Corbara, B.; Dejean, A.; Orivel, J. |
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Title |
Trophic mediation by a fungus in an ant-plant mutualism |
Type |
Journal Article |
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Year |
2011 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
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Volume |
99 |
Issue |
2 |
Pages |
583-590 |
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Keywords |
delta N-15; Allomerus decemarticulatus; ant-plant-fungus interactions; Ascomycete; fungal mediation; Hirtella physophora; mutualisms; myrmecophytes; nutrient provisioning; stable isotopes |
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Abstract |
1. Plants often rely on external, mutualistic partners to survive and reproduce in resource-limited environments or for protection from enemies. Such interactions, including mycorrhizal symbioses and ant plant associations, are widespread and play an important role at the ecosystem and community levels. In ant-plant mutualisms, the plants may benefit from both the protection provided by the presence of ants and from the nutrients absorbed from insect debris. However, the role of third partners in plant nutrition, particularly ant-associated fungi, has never before been demonstrated. 2. We investigate this issue in the ant-plant Hirtella physophora. In this model system, Allomerus decemarticulatus ants are involved in two, highly specific interactions: first, with their host plant, and, secondly, with a fungus that they actively manipulate. Moreover, the ants combine both plant trichomes and fungal hyphae to make a trap to capture prey. 3. We empirically demonstrate the existence of a third type of interaction between the fungus and the plant through the use of both experimental enrichments with stable isotopes (N-15) and histological approaches. The fungus growing in the galleries plays a role in providing nutrients to the host plant, in addition to the structural role it plays for the ants. Fungus-facilitated nitrogen uptake occurs mainly in old domatia, where abundant hyphae are in close contact with the plant cells. Whether the fungi inside the domatia and those in the galleries are the same is still uncertain. 4. Synthesis. Together, our results show that a fungal partner in an ant-plant mutualism can benefit the plant by improving its nutrient uptake, and they demonstrate the existence of a true tripartite mutualism in this system. Our results add further evidence to the notion that interpretations of some ant plant symbioses as purely protective mutualisms have overlooked these nutritional aspects. |
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Address  |
[Leroy, Celine; Dejean, Alain; Orivel, Jerome] CNRS, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf |
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Wiley-Blackwell |
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0022-0477 |
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ISI:000287785300024 |
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EcoFoG @ webmaster @ |
Serial |
297 |
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Author |
Lecante, A.; Robert, F.; Blandinieres, P.A.; Roos, C. |
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Title |
Anti-corrosive properties of S. tinctoria and G. ouregou alkaloid extracts on low carbon steel |
Type |
Journal Article |
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Year |
2011 |
Publication |
Current Applied Physics |
Abbreviated Journal |
Curr. Appl. Phys. |
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Volume |
11 |
Issue |
3 |
Pages |
714-724 |
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Keywords |
Low carbon steel; Acidic media; Corrosion inhibitor; Plant extract; EIS |
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Abstract |
The effect of alkaloid extracts from two Amazonian trees (Guatteria ouregou and Simira tinctoria) on low carbon steel corrosion was investigated in acidic solutions by using electrochemical techniques. All of these plant extracts inhibit the corrosion of low carbon steel in 0.1 M HCl solutions. As their concentration increases to 250 mg/L, the inhibition efficiencies of S. tinctoria and G. ouregou alkaloid extracts reach approximately 92% in 0.1 M HCl solutions. The adsorption of the inhibitor molecules was in accordance with the Langmuir adsorption isotherm. The results obtained show that these plant extracts could be serve as an effective inhibitor for the corrosion of low carbon steel in hydrochloric acid media. Furthermore, harmane was identified as the main component of S. tinctoria extract and that suggests that it is the active ingredient against corrosion of low carbon steel. (C) 2010 Elsevier B.V. All rights reserved. |
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Address |
[Lecante, A.; Robert, F.; Blandinieres, P. A.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, F-97337 Cayenne, French Guiana, France, Email: florent.robert@guyane.univ-ag.fr |
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Elsevier Science Bv |
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ISSN |
1567-1739 |
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ISI:000288183300088 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
300 |
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Author |
Lebrini, M.; Robert, F.; Roos, C. |
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Title |
Inhibition Effect of Alkaloids Extract from Annona Squamosa Plant on the Corrosion of C38 Steel in Normal Hydrochloric Acid Medium |
Type |
Journal Article |
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Year |
2010 |
Publication |
International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
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Volume |
5 |
Issue |
11 |
Pages |
1698-1712 |
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Keywords |
Plant extract; corrosion inhibitors; C38 steel; acidic media; adsorption |
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Abstract |
In this work, an alkaloids extract from Annona squamosa plant have been studied as possible corrosion inhibitor for C38 steel in molar hydrochloric acid (1 M HCl). Potentiodynamic polarization and AC impedance methods have been used. The corrosion inhibition efficiency increases on increasing plant extract concentration. Polarisation studies showed that Annona squamosa extract was mixed-type inhibitor in 1 M HCl. The inhibition efficiency of Annona squamosa extract was temperature-dependent and its addition led to an increase of the activation corrosion energy revealing a physical adsorption between the extract and the metal surface. The adsorption of the Annona squamosa extract followed Langmuir's adsorption isotherm. The inhibitive effect of Annona squamosa is ascribed to the presence of organic compounds in the extract. The examined extract is considered as non-cytotoxic substance. |
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Address |
[Lebrini, M.] CNRS 8172 UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr |
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ELECTROCHEMICAL SCIENCE GROUP |
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ISSN |
1452-3981 |
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Notes |
ISI:000283999000015 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
20 |
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Author |
Lebrini, M.; Robert, F.; Roos, C. |
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Title |
Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium |
Type |
Journal Article |
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Year |
2011 |
Publication |
International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
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Volume |
6 |
Issue |
3 |
Pages |
847-859 |
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Keywords |
Palicourea guianensis; corrosion inhibitors; C38 steel; acidic media; adsorption |
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Abstract |
Corrosion inhibition effect of alkaloids extract from Palicourea guianensis plant (AEPG) on C38 tell in 1 M HCl medium has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The polarization studies that AEPG acts as mixed-type inhibitor. The electrochemical impedance spectroscopy showed that the charge transfer resistance increases and the double layer capacitance decreases on increasing plant extract concentration. The inhibition efficiency of the extract obtained from impedance and polarization measurements was in a good agreement and was found to increase with increasing concentration of the extract. Inhibition efficiency of 89% was achieved with 100 mg L-1 of AEPG at 25 degrees C. The obtained results showed that, the Palicourea guianensis extract could serve as an effective inhibitor for the corrosion of steel in acid media. The adsorption of AEPG obeys the Langmuir adsorption isotherm. |
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Address |
[Lebrini, M.; Robert, F.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr |
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Electrochemical Science Group |
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1452-3981 |
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Notes |
ISI:000287820500026 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
298 |
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Author |
Lebrini, M.; Robert, F.; Blandinieres, P.A.; Roos, C. |
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Title |
Corrosion Inhibition by Isertia coccinea Plant Extract in Hydrochloric Acid Solution |
Type |
Journal Article |
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Year |
2011 |
Publication |
International Journal of Electrochemical Science |
Abbreviated Journal |
Int. J. Electrochem. Sci. |
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Volume |
6 |
Issue |
7 |
Pages |
2443-2460 |
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Keywords |
Isertia coccinea; corrosion inhibitors; C38 steel; acidic media; adsorption |
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Abstract |
The effect of alkaloids extracted from Isertia coccinea plant (AEIC) on the corrosion of C38 steel in 1 M hydrochloric acid was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Potentiodynamic polarization curves indicated that the extract behave as mixed-type inhibitor. The experimental data obtained from EIS method show a frequency distribution and therefore a modelling element with frequency dispersion behaviour, a constant phase element (CPE) has been used. The inhibition efficiencies of the extract calculated by three methods show the same tendency. Inhibition was found to increase with increasing concentration of the plant extract. The results obtained show that the extract solution of the plant could serve as an effective inhibitor for the corrosion of C38 steel in hydrochloric acid solution. The apparent activation energy of the process taking place in inhibitor presence was determined on the ground of four temperature values in the range from 25 degrees C to 55 degrees C using the data obtained by two independent methods. Theoretical fitting of different isotherms, Langmuir, Temkin and Frunkin, were tested to clarify the nature of adsorption. |
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Address |
[Lebrini, M.; Robert, F.; Blandinieres, P. A.; Roos, C.] UAG UMR ECOFOG, Lab Mat & Mol Milieu Amazonien, Cayenne 97337, French Guiana, Email: florent.robert@guyane.univ-ag.fr |
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Electrochemical Science Group |
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ISSN |
1452-3981 |
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Notes |
ISI:000292331400014 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
324 |
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Author |
Le Lann, C.; Roux, O.; Serain, N.; Van Alphen, J.J.M.; Vernon, P.; Van Baaren, J. |
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Title |
Thermal tolerance of sympatric hymenopteran parasitoid species: does it match seasonal activity? |
Type |
Journal Article |
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Year |
2011 |
Publication |
Physiological Entomology |
Abbreviated Journal |
Physiol. Entomol. |
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Volume |
36 |
Issue |
1 |
Pages |
21-28 |
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Keywords |
Climate change; critical thermal limits; CTmax; CTmin; dry mass; guild; hind tibia length; seasonal activities; surface to volume ratio |
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Abstract |
Climatic changes result in an increased in mean temperature and in a higher incidence of extreme weather events such as heat and cold waves. For ectotherms, such as insect parasitoids, the ability to remain active under extreme climatic conditions is a significant key to fitness. The body size of individuals, and in particular their surface to volume ratio, may play a role in their resistance to thermal conditions. The thermal tolerances are investigated of two closely-related sympatric parasitoid species [Aphidius avenae Haliday and Aphidius rhopalosiphi De Stefani-Perez (Hymenoptera: Aphidiinae)] that have a similar ecology but differ in body size and phenologies. The critical thermal limits of individuals are assessed in both sexes of each parasitoid species and the influence of surface volume ratios on their thermal tolerances. Aphidius avenae is less resistant to low temperatures and more resistant to high temperatures than A. rhopalosiphi. The lower surface to volume ratio of A. avenae individuals may help them to remain active in summer when experiencing heat waves. However, body size is not the sole factor that plays a role in differences of thermal tolerance between species and body size may not be an adaptation to extreme temperatures but rather a by-product of developmental regulation. Closely-related sympatric species from the same ecological guild can have different thermal tolerances that may allow them to occur within the same habitat. The present study also highlights the importance of clearly defining how to measure critical thermal limits to determine the thermal tolerance of a species. |
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Address |
[Le Lann, Cecile; Serain, Nelly; Van Alphen, Jacques J. M.; Vernon, Philippe; Van Baaren, Joan] Univ Rennes 1, UMR CNRS ECOBIO 6553, F-35042 Rennes, France, Email: cecile.lelann@univ-rennes1.fr |
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Wiley-Blackwell |
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0307-6962 |
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Notes |
ISI:000287790900004 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
294 |
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Author |
Kiaer, L.P.; Felber, F.; Flavell, A.; Guadagnuolo, R.; Guiatti, D.; Hauser, T.P.; Olivieri, A.M.; Scotti, I.; Syed, N.; Vischi, M.; van de Wiel, C.; Jorgensen, R.B. |
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Title |
Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L |
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Journal Article |
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Year |
2009 |
Publication |
Genetic Resources and Crop Evolution |
Abbreviated Journal |
Genet. Resour. Crop Evol. |
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Volume |
56 |
Issue |
3 |
Pages |
405-419 |
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Keywords |
AFLP; GM co-existence; Gene dispersal; Introgression; Risk assessment; SSAP |
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Abstract |
Spontaneous gene flow between wild and cultivated chicory, Cichorium intybus L., may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to identify and quantify crop-wild gene flow in chicory, we analysed introgression in 19 wild chicory populations and 16 accessions of chicory varieties and landraces distributed across Northern, Central and Mediterranean Europe. The analysis used 281 AFLP markers and 75 SSAP markers giving a total of 356 polymorphic markers. Results from model based assignments with the program STRUCTURE indicated many incidents of recent gene flow. Gene flow was observed both between cultivars and wild populations, between landraces and wild populations, between different wild populations as well as between cultivars. Population structure visualized by distance-based clustering showed a North-South geographical structuring of the wild populations, and a general grouping of the cultivars corresponding to known origin. The results indicated, however, that the structuring between the two groups of wild and cultivated types was weak. As crop and wild recipients are genetically close and genes are transferred between the two types rather frequently, focus on mitigating crop-wild gene flow should be increased, before transgenic varieties are cultivated openly. |
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Address |
[Kiaer, L. P.; Jorgensen, R. B.] DTU, Riso Natl Lab, Biosyst Dept, DK-4000 Roskilde, Denmark, Email: rikke.bagger.jorgensen@risoe.dk |
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SPRINGER |
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0925-9864 |
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Notes |
ISI:000264835300011 |
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EcoFoG @ eric.marcon @ |
Serial |
204 |
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Author |
Kenne, M.; Feneron, R.; Djieto-Lordon, C.; Malherbe, M.C.; Tindo, M.; Ngnegueu, P.R.; Dejean, A. |
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Title |
Nesting and foraging habits in the arboreal ant Atopomyrmex mocquerysi ANDRE, 1889 (Hymenoptera: Formicidae: Myrmicinae) |
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Journal Article |
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Year |
2009 |
Publication |
Myrmecological News |
Abbreviated Journal |
Myrmecol. News |
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Volume |
12 |
Issue |
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Pages |
109-115 |
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Keywords |
Cameroon; wood-excavating ant; nest site selection; pest ant; predatory behavior; rhythm of activity; life history |
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Abstract |
Atopomyrmex mocquerysi ANDRE, 1889 is a West-Central African wood-excavating myrmicine species whose colonies construct galleries in the main live branches of their host trees, causing the distal parts of these branches to dry out. In southeastern Cameroon, this species was mainly found in woody savannahs that are burned annually. It was also present in the canopy of a secondary forest, but was relatively rare on trees growing along forest edges and entirely absent from the canopy of an old-growth forest. It was absent from oil palm and coffee tree plantations, rare on cocoa trees. present on 0.2% to 5.3% of the avocado, guava, mango and Citrus spp. trees monitored, and frequent on safoo trees (12.4%). A fire in a mango plantation seems to have favored its presence. The colonies generally exploit Aleyrodidae, Aphididae, Coccidae, and Stictococcidae. Workers forage for prey diurnally, mostly on the ground. Their predatory behavior is characterized by detection through contact. Workers recruit nestmates at short-range (within range of an alarm pheromone), rarely at long-range, after which they spread-eagle the prey and immediately cut it up on the spot. Individual workers retrieve the prey pieces. Unlike other territorially-dominant arboreal ants, A. mocquerysi is a threat to host trees because. in addition to being a wood-excavating species, its workers only slightly protect the foliage of their host tree from herbivorous insects since they mostly hunt on the ground. |
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Address |
[Kenne, Martin; Tindo, Maurice] Univ Douala, Fac Sci, Dept Biol Organismes Anim, Douala, Cameroon, Email: medoum68@yahoo.fr |
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OESTERREICHISCHE GESELL ENTOMOFAUNISTIK, C/O NATURHISTOR MUSEUM WIEN |
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1994-4136 |
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Notes |
ISI:000271357700012 |
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EcoFoG @ eric.marcon @ |
Serial |
97 |
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Author |
Masse, P.S.M.; Kenne, M.; Mony, R.; Dejean, A.; Tindo, M. |
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Title |
Initial behavior in colony fragments of an introduced population of the invasive ant Wasmannia auropunctata |
Type |
Journal Article |
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Year |
2011 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
334 |
Issue |
7 |
Pages |
572-576 |
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Keywords |
Aggregation; Death feigning; Thanatosis; Worker transportation; Biological invasion; Little fire ant |
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Abstract |
We investigated in the laboratory the initial behavior of propagules of the invasive ant Wasmannia auropunctata in Cameroon where it has been introduced. Both workers and queens at first feigned death (thanatosis), and then the workers slowly moved around the experimental arena; the queens did the same about 10 seconds later. Each queen antennated selected workers that then aggregated together by grasping the hind leg of another ant with their mandibles. When encountering the queen again, the lead worker climbed up the queen's hind leg and onto her back, followed by some other individuals. The remaining workers followed the queen to a location in the experimental arena. When brood was present, the workers transferred it to this location. Orphaned workers did not aggregate, but gathered the brood together and took care of it. By permitting propagules to survive, these behaviors likely contribute to the success of W. auropunctata as an invader. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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Address |
[Kenne, M; Mony, R; Tindo, M] Univ Douala, Fac Sci, Dept Biol Organismes Anim, Douala, Cameroon, Email: tindodouala@yahoo.com |
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Elsevier France-Editions Scientifiques Medicales Elsevier |
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1631-0691 |
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Notes |
WOS:000293673300010 |
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no |
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Call Number |
EcoFoG @ webmaster @ |
Serial |
332 |
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Author |
Jaouen, G.; Fournier, M.; Almeras, T. |
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Title |
Thigmomorphogenesis versus light in biomechanical growth strategies of saplings of two tropical rain forest tree species |
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Journal Article |
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Year |
2010 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
67 |
Issue |
2 |
Pages |
211 |
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Keywords |
biomechanics; thigmomorphogenesis; height growth strategies; tropical rain forest; French Guiana |
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Abstract |
In the dense tropical rainforest understorey, saplings exhibit different growth strategies aiming at reaching light levels better fitting their ecology. Investing mainly in height growth, at the expense of their width, a lot are close to mechanical instability. Tachigali melinonii, a long living heliophilic tree species, is frequently observed to be extremely slender and supported by neighbours. Such observations suggest an active growth control through the perception of mechanical environment. Mechanical environment or light availability, which one is the most influent on growth and slenderness (H/D)? To test this question, we recorded growth of control and staked saplings of two species with contrasting habits and ecology: T. melinonii, and Dicorynia guianensis, along a natural light gradient. Dicorynia, the more stable, responded more clearly to the staking treatment, showing slenderness increase when light is available, whereas for Tachigali, only light availability governed growth. For Tachigali, growth allocation is mainly governed by light availability and ontogeny, whereas Dicorynia is probably similar to the average tree strategy, using the thigmomorphogenetic physiological process to control its stability. |
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[Jaouen, Gaelle; Almeras, Tancrede] Univ Antilles Guyane, INRA, CNRS,Cirad, Unite Mixte Rech Ecol Forets Guyane,AgroParisTech, Kourou 97379, French Guiana, Email: gaelle.jaouen@ecofog.gf |
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EDP SCIENCES S A |
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1286-4560 |
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ISI:000276507100012 |
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EcoFoG @ eric.marcon @ |
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61 |
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