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Author |
Maia, A.C.D.; Schlindwein, C.; Navarro, D.M.A.F.; Gibernau, M. |
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Title |
Pollination of Philodendron Acutatum (Araceae) in the Atlantic Forest of Northeastern Brazil: A Single Scarab Beetle Species Guarantees High Fruit Set |
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Journal Article |
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Year |
2010 |
Publication |
International Journal of Plant Sciences |
Abbreviated Journal |
Int. J. Plant Sci. |
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Volume |
171 |
Issue  |
7 |
Pages |
740-748 |
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Keywords |
Cyclocephala; floral volatiles; pollination specificity; reproductive success; thermogenesis |
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Abstract |
Philodendron acutatum (Araceae) is a hemiepiphyte common to the Atlantic Forest of northeastern Brazil. In two localities, we studied the species' breeding system and associations with flower-visiting insects, along with an analysis of its floral scent composition. The fruit set of self-incompatible P. acutatum was high, more than 90%, and inflorescences were exclusively pollinated by one species of scarab beetle, Cyclocephala celata (Scarabaeidae, Dynastinae). Pollinators are drawn toward the inflorescences at dusk by strong floral fragrances given off during the female phase of anthesis, along with endogenous heating of the spadix, whose temperatures were recorded at more than 11 degrees C above ambient air. Two other species of flower-visiting Cyclocephala were also consistently recovered in blacklight trappings during the flowering period of P. acutatum. The fact that only C. celata was found in association with P. acutatum suggests a local reproductive dependence of the plant to this scarab beetle species. Dihydro-beta-ionone and 2-hydroxy-5-methyl-3-hexanone, a rare volatile molecule so far unreported as a floral compound, together accounted for more than 97% of the unique scent composition of P. acutatum and might be involved in specific attraction of C. celata. |
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[Dalia Maia, Artur Campos] Univ Fed Paraiba, Programa Posgrad Ciencias Biol, BR-58059900 Joao Pessoa, Paraiba, Brazil, Email: arturcamposmaia@yahoo.com.br |
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UNIV CHICAGO PRESS |
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1058-5893 |
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ISI:000280855800003 |
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EcoFoG @ eric.marcon @ |
Serial |
46 |
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Author |
Coste, S.; Roggy, J.C.; Garraud, L.; Heuret, P.; Nicolini, E.; Dreyer, E. |
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Title |
Does ontogeny modulate irradiance-elicited plasticity of leaf traits in saplings of rain-forest tree species? A test with Dicorynia guianensis and Tachigali melinonii (Fabaceae, Caesalpinioideae) |
Type |
Journal Article |
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Year |
2009 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
66 |
Issue |
7 |
Pages |
701-709 |
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Keywords |
plant architecture; phenotypic plasticity; photosynthetic capacity; leaf structure; tropical rain forest |
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Abstract |
Irradiance elicits a large plasticity in leaf traits, but little is known about the modulation of this plasticity by ontogeny. Interactive effects of relative irradiance and ontogeny were assessed on leaf traits for two tropical rainforest tree species: Dicorynia guianensis Amshoff and Tachigali melinonii (Harms) Barneby (Fabaceae, Caesalpinioideae). Eleven morphological and physiological leaf traits, relative to photosynthetic performance, were measured on saplings at three different architectural development stages (ASD 1, 2 and 3) and used to derive composite traits like photosynthetic N-use efficiency. Measurements were made along a natural irradiance gradient. The effect of ASD was very visible and differed between the two species. For Dicorynia guianensis, only leaf mass-per-area (LMA) significantly increased with ASDs whereas for Tachigali melinonii, almost all traits were affected by ASD: LMA, leaf N content and photosynthetic capacity increased from ASD 1 to ASD 3. Photosynthetic N-use-efficiency was not affected by ASD in any species. Leaf traits were severely modulated by irradiance, whereas the degree of plasticity was very similar among ASDs. Only few interactions were detected between irradiance and ASD, for leaf thickness, carbon content, and the ratio Chl/N in T. melinonii and for photosynthetic capacity in D. guianensis. We conclude that ontogenic development and irradiance-elicited plasticity modulated leaf traits, with almost no interaction, i.e., the degree of irradiance-elicited plasticity was stable across development stages and independent of ontogeny in these two species, at least in the early stages of development assessed here. |
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[Dreyer, Erwin] INRA, UMR Ecol & Ecophysiol Forestieres 1137, F-54280 Champenoux, France, Email: dreyer@nancy.inra.fr |
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EDP SCIENCES S A |
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1286-4560 |
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Notes |
ISI:000270906600009 |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
100 |
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Author |
Delabie, J.H.C.; Cereghino, R.; Groc, S.; Dejean, A.; Gibernau, M.; Corbara, B.; Dejean, A. |
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Title |
Ants as biological indicators of Wayana Amerindian land use in French Guiana |
Type |
Journal Article |
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Year |
2009 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
332 |
Issue |
7 |
Pages |
673-684 |
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Keywords |
Landscape ecology; Traditional land use; Formicidae; Rapid assessment; Pit-fall traps; Self-Organizing Maps |
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Abstract |
We examined the ecological impact of traditional land use by Wayana Amerindians in French Guiana using ants as bio-indicators. Ants were sampled through a rapid assessment method and the core results analyzed using Kohonen's self-organizing maps (SOM). Our sample sites included: (1) a Wayana village; (2) a cassava plantation; (3) an abandoned cassava plantation; (4) a forest fragment near the village; (5) a riparian forest; and (6) a primary terra firma forest. The ant diversity decreases according to the decree to which the habitat is disturbed. The SOM allowed us to compare the ecological succession between the six habitats. The protocol used is robust since the same conclusions were drawn using partial data. To cite this article: J.H.C Delabie et al., C R. Biologies 332 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved. |
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[Groc, Sarah; Dejean, Andrea; Dejean, Alain] CNRS, UMR 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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Notes |
ISI:000267243700009 |
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EcoFoG @ eric.marcon @ |
Serial |
109 |
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Author |
Herault, B.; Bornet, A.; Tremolieres, M. |
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Title |
Redundancy and niche differentiation among the European invasive Elodea species |
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Journal Article |
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Year |
2008 |
Publication |
Biological Invasions |
Abbreviated Journal |
Biol. Invasions |
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Volume |
10 |
Issue |
7 |
Pages |
1099-1107 |
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Keywords |
biological traits; functional equivalence; invasivness; niche overlapping; waterweeds |
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Abstract |
Community ecologists implicitly assume redundancy when they aggregate species into functional groups. But there have been remarkably few empirical efforts to investigate the accuracy of this concept in situ. The concept of redundancy could be roughly split into two components: the ecological redundancy (similar response to environmental variations involving similar ecological processes) and the functional redundancy (similar biological trait combinations shaping similar functional processes). Both types of redundancy are tested among the 3 invasive European Elodeas. In 11 sites and during two successive years 2004-2005, the cover growth rate of each Elodea species was monthly recorded. To test ecological redundancy, cover growth rates were related to a large suite of environmental variables. To test functional redundancy, 13 biological traits involved in competitive relationships were measured each month. Firstly, the redundancy hypothesis looks problematic for Elodea ernstiae. Indeed, the later possess numerous biological traits involved in light competition and niche overlap with the other Elodeas is very low. Secondly, ecological and functional redundancy can be successfully applied to Elodea canadensis and Elodea nuttallii. They share a large suite of biological traits leading to wide niche overlaps through the growing season. And the measured environmental variables do not differentially influence their growth rates, which are, in turn, controlled by a similar group of biological traits. In this way, the different invasiveness patterns of E. canadensis and E. nuttallii could be solely due to the ecological drift and their ecological dynamic could follow neutral rules. |
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[Herault, Bruno] Univ Antilles Guyane, INRA, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: Bruno.Herault@cirad.fr |
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SPRINGER |
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1387-3547 |
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Notes |
ISI:000258704400015 |
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EcoFoG @ eric.marcon @ |
Serial |
131 |
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Author |
Li, M.C.; Royer, M.; Stien, D.; Lecante, A.; Roos, C. |
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Title |
Inhibitive effect of sodium eperuate on zinc corrosion in alkaline solutions |
Type |
Journal Article |
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Year |
2008 |
Publication |
Corrosion Science |
Abbreviated Journal |
Corrosion Sci. |
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Volume |
50 |
Issue |
7 |
Pages |
1975-1981 |
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Keywords |
zinc; concrete; EIS; alkaline corrosion; passivity |
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Abstract |
The effect of sodium eperuate prepared from Wallaba (Eperua falcata Aubl) extract on zinc corrosion was investigated in alkaline solutions with chloride ions (i.e., simulated concrete pore solutions) by using electrochemical techniques. Sodium eperuate inhibits the corrosion of zinc in 0.1 M NaCl solutions with pH 9.6. As its concentration increases to 1 g/L, the inhibition efficiency reaches approximately 92%. In alkaline solutions with pH 12.6, sodium eperuate has no adverse effect on passivity of zinc, and retards the chloride attack. These suggest that sodium eperuate is an effective inhibitor for the protection of zinc in alkaline environments. (c) 2008 Elsevier Ltd. All rights reserved. |
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Address |
[Li, M. C.; Royer, M.; Stien, D.] UMR ECOFOG, CNRS, F-97337 Cayenne, French Guiana, Email: mouchengli@yahoo.com.cn |
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PERGAMON-ELSEVIER SCIENCE LTD |
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0010-938X |
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Notes |
ISI:000258543600021 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
132 |
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Author |
Ollivier, M.; Baraloto, C.; Marcon, E. |
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Title |
A trait database for Guianan rain forest trees permits intra- and inter-specific contrasts |
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Journal Article |
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Year |
2007 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
64 |
Issue |
7 |
Pages |
781-786 |
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Keywords |
plant traits; tropical forest; French Guiana; functional groups; plasticity; ontogeny |
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Abstract |
We present a plant trait database covering autecology for rain forest trees of French Guiana. The database comprises more than thirty traits including autecology (e. g., habitat associations and reproductive phenology), wood structure (e. g., density and tension characteristics) and physiology at the whole plant (e. g., carbon and nitrogen isotopes) and leaf level (e. g., specific leaf area, photosynthetic capacity). The current database describes traits for about nine hundred species from three hundred genera in one hundred families. For more than sixty species, data on twelve morphological and ecophysiological traits are provided for individual plants under different environmental conditions and at different ontogenetic stages. The database is thus unique in permitting intraspecific analyses, such as the effects of ontogenetic stages or environmental conditions on trait values and their relationships. |
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INRA, Unit Mixte Rech Ecol Forets Guyane, Kourou, France, Email: baraloto.c@kourou.cirad.fr |
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EDP SCIENCES S A |
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1286-4560 |
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Notes |
ISI:000250097700011 |
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no |
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Call Number |
EcoFoG @ eric.marcon @ |
Serial |
158 |
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Author |
Liu, S.Q.; Loup, C.; Gril, J.; Dumonceaud, O.; Thibaut, A.; Thibaut, B. |
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Title |
Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parameters |
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Journal Article |
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Year |
2005 |
Publication |
Annals of Forest Science |
Abbreviated Journal |
Ann. For. Sci. |
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Volume |
62 |
Issue |
7 |
Pages |
625-632 |
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Keywords |
Fagus sylvatica L.; CIELab colour system; solid wood; red heartwood |
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Abstract |
Colour parameters of European beech were measured using CIELab system. 103 logs from 87 trees in 9 sites were cut into boards to study the radial variations of wood colour parameters. Both site and tree effects on colour were observed. Patterns of red heartwood occurrence were defined. When excepting red heartwood there was still a highly significant effect of site and tree. Axial and radial variations were small, except very near the pith or in red heartwood, suggesting possible early selection at periphery under colour criteria. Red heartwood is darker, redder and more yellow than normal peripheral wood. |
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Univ Montpellier 2, Lab Mecan & Genie Civil, F-34095 Montpellier, France, Email: jgril@lmgc.univ-montp2.fr |
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EDP SCIENCES S A |
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1286-4560 |
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Notes |
ISI:000233179100003 |
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no |
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EcoFoG @ eric.marcon @ |
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251 |
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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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1452-3981 |
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Notes |
ISI:000292331400014 |
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no |
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EcoFoG @ webmaster @ |
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324 |
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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 |
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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 |
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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EcoFoG @ webmaster @ |
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332 |
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Author |
Christensen-Dalsgaard, K.K.; Ennos, A.R.; Fournier, M. |
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Title |
Interrelations between hydraulic and mechanical stress adaptations in woody plants |
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Journal Article |
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Year |
2008 |
Publication |
Plant Signaling and Behavior |
Abbreviated Journal |
Plant. Signal. Behav. |
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Volume |
3 |
Issue |
7 |
Pages |
463-465 |
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Keywords |
Conductivity; Modulus of elasticity; Strain; Tree ecophysiology; Tropical trees; Wood anatomy; Yield stress |
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Abstract |
The fields of plant water relations and plant biomechanics have traditionally been studied separately even though often the same tissues are responsible for water transport and mechanical support. There is now increasing evidence that hydraulic and mechanical adaptations may influence one another. We studied the changes in the hydraulic and mechanical properties of the wood along lateral roots of two species of buttressed trees. In these roots, the mechanical contstraints quantified by strain measurements are known to decrease distally. Further, we investigated the effect of mechanical loading on the vessel anatomy in these and four other species of tropical trees. We found that as the strain decreased, the wood became progressively less stiff and strong but the conductivity increased exponentially. This was reflected in that adaptations towards re-enforcing mechanically loaded areas resulted in xylem with fewer and smaller vessels. In addition a controlled growth experiment on three tree species showed that drought adaptation may results in plants with stronger and stiffer tissue. Our results indicate that hydraulic and mechanical stress adaptations may be interrelated, and so support recent studied suggesting that physiological responses are complex balances rather than pure optimisations. ©2008 Landes Bioscience. |
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Address |
University of Alberta, Department of Renewable Resources, 4-44 Earth Science Bldg., Edmonton, AB T6G 2E3, Canada |
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15592316 (Issn) |
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Notes |
Export Date: 25 January 2012; Source: Scopus; Language of Original Document: English; Correspondence Address: Christensen-Dalsgaard, K. K.; University of Alberta, Department of Renewable Resources, 4-44 Earth Science Bldg., Edmonton, AB T6G 2E3, Canada; email: kkchrist@ualberta.ca |
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EcoFoG @ webmaster @ |
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380 |
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