Records |
Author |
Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A. |
Title |
Low intraspecific aggressiveness in two obligate plant-ant species |
Type |
Journal Article |
Year |
2008 |
Publication |
Insectes Sociaux |
Abbreviated Journal |
Insect. Soc. |
Volume |
55 |
Issue |
3 |
Pages |
238-240 |
Keywords |
aggressiveness; Allomerus; myrmecophytes; plant-ants; recognition ability |
Abstract |
Little is known about the aggressiveness of plant-ants typically living in isolated trees nor about how that aggressiveness varies based on this isolation. Here, we examine intra- and interspecific aggressiveness between workers of two Allomerus species associated with two different myrmecophytes. In both cases, the level of intraspecific aggressiveness is very low whatever the distance separating the tested nests, while interspecific conflicts are always violent. Similar patterns of aggressiveness have been reported in various ant species, but the strictly arboreal life of Allomerus ants associated with the isolation of their adult colonies highlight different ecological conditions that might explain the lack of aggressiveness between conspecifics. |
Address |
[Grangier, J.; Orivel, J.; Negrini, M.; Dejean, A.] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse 9, France, Email: grangier@cict.fr |
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Thesis |
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Publisher |
BIRKHAUSER VERLAG AG |
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Series Issue |
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Edition |
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ISSN |
0020-1812 |
ISBN |
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Conference |
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Notes |
ISI:000258959300004 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
208 |
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Author |
Gonzalez, M.A.; Roger, A.; Courtois, E.A.; Jabot, F.; Norden, N.; Paine, C.E.T.; Baraloto, C.; Thebaud, C.; Chave, J. |
Title |
Shifts in species and phylogenetic diversity between sapling and tree communities indicate negative density dependence in a lowland rain forest |
Type |
Journal Article |
Year |
2010 |
Publication |
Journal of Ecology |
Abbreviated Journal |
J. Ecol. |
Volume |
98 |
Issue |
1 |
Pages |
137-146 |
Keywords |
APG II plus rbcL megatree; density dependence; DNA barcoding; French Guiana; phylogenetic diversity; species diversity; tropical plant communities |
Abstract |
P>1. As trees in a given cohort progress through ontogeny, many individuals die. This risk of mortality is unevenly distributed across species because of many processes such as habitat filtering, interspecific competition and negative density dependence. Here, we predict and test the patterns that such ecological processes should inscribe on both species and phylogenetic diversity as plants recruit from saplings to the canopy. 2. We compared species and phylogenetic diversity of sapling and tree communities at two sites in French Guiana. We surveyed 2084 adult trees in four 1-ha tree plots and 943 saplings in sixteen 16-m2 subplots nested within the tree plots. Species diversity was measured using Fisher's alpha (species richness) and Simpson's index (species evenness). Phylogenetic diversity was measured using Faith's phylogenetic diversity (phylogenetic richness) and Rao's quadratic entropy index (phylogenetic evenness). The phylogenetic diversity indices were inferred using four phylogenetic hypotheses: two based on rbcLa plastid DNA sequences obtained from the inventoried individuals with different branch lengths, a global phylogeny available from the Angiosperm Phylogeny Group, and a combination of both. 3. Taxonomic identification of the saplings was performed by combining morphological and DNA barcoding techniques using three plant DNA barcodes (psbA-trnH, rpoC1 and rbcLa). DNA barcoding enabled us to increase species assignment and to assign unidentified saplings to molecular operational taxonomic units. 4. Species richness was similar between saplings and trees, but in about half of our comparisons, species evenness was higher in trees than in saplings. This suggests that negative density dependence plays an important role during the sapling-to-tree transition. 5. Phylogenetic richness increased between saplings and trees in about half of the comparisons. Phylogenetic evenness increased significantly between saplings and trees in a few cases (4 out of 16) and only with the most resolved phylogeny. These results suggest that negative density dependence operates largely independently of the phylogenetic structure of communities. 6. Synthesis. By contrasting species richness and evenness across size classes, we suggest that negative density dependence drives shifts in composition during the sapling-to-tree transition. In addition, we found little evidence for a change in phylogenetic diversity across age classes, suggesting that the observed patterns are not phylogenetically constrained. |
Address |
[Gonzalez, Mailyn A.; Roger, Aurelien; Courtois, Elodie A.; Jabot, Franck; Norden, Natalia; Thebaud, Christophe; Chave, Jerome] Univ Toulouse 3, Lab Evolut & Diversite Biol, UMR 5174, CNRS, F-31062 Toulouse, France, Email: gonzalez.mailyn@gmail.com |
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Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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Edition |
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ISSN |
0022-0477 |
ISBN |
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Conference |
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Notes |
ISI:000272657400015 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
88 |
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Author |
Gond, V.; Guitet, S. |
Title |
Remote Sensing in Post-Logging Diagnoses for Forest Management in French Guiana |
Type |
Journal Article |
Year |
2009 |
Publication |
Bois et Forets des Tropiques |
Abbreviated Journal |
Bois For. Trop. |
Volume |
63 |
Issue |
299 |
Pages |
5-13 |
Keywords |
selective logging; logging impact inspections; French Guiana; remote sensing; forest management |
Abstract |
This study is part of the activities carried out to monitor tow-impact logging operations in humid tropical forests. The sustainability of these activities is highly dependent on the scale of logging damage, and managers therefore need to carry out effective checks on the quality of forestry work. In this study, remote sensing was used to track the extension of logging operations and to assess damage, through images acquired during and after logging in each parcel. Analysis of the high-resolution images (10 m) clearly identifies logged-over clearings and some skidding tracks, allowing assessments of gaps opening up in the canopy. Several parcels were monitored in this French Guiana study. A simple diagnostic procedure was established for each parcel to assess logging intensity and identify new logging tracks and timber losses. The remote sensing toot thus helps to make more accurate assessments of logging quality and to draw relevant conclusions for the logging company. The study has demonstrated the usefulness of remote sensing to identify damage after logging. The quality of restitution of the damage was validated by means of a database on the logging terrain and through field missions. This post-logging inspection tool can now be automated for fully operational use by forest managers. |
Address |
[Gond, Valery] Univ Laval, Fac Foresterie, Umr Ecofog Guyane francaise, Cirad,UR 36, Quebec City, PQ G1V OA6, Canada |
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Thesis |
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Publisher |
CIRAD-CENTRE COOPERATION INT RECHERCHE AGRONOMIQUE POUR |
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Edition |
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ISSN |
0006-579X |
ISBN |
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Notes |
ISI:000266156700001 |
Approved |
no |
Call Number |
EcoFoG @ webmaster @ |
Serial |
280 |
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Author |
Gloor, M.; Phillips, O.L.; Lloyd, J.J.; Lewis, S.L.; Malhi, Y.; Baker, T.R.; Lopez-Gonzalez, G.; Peacock, J.; Almeida, S.; de Oliveira, A.C.A.; Alvarez, E.; Amaral, I.; Arroyo, L.; Aymard, G.; Banki, O.; Blanc, L.; Bonal, D.; Brando, P.; Chao, K.J.; Chave, J.; Davila, N.; Erwin, T.; Silva, J.; Di Fiore, A.; Feldpausch, T.R.; Freitas, A.; Herrera, R.; Higuchi, N.; Honorio, E.; Jimenez, E.; Killeen, T.; Laurance, W.; Mendoza, C.; Monteagudo, A.; Andrade, A.; Neill, D.; Nepstad, D.; Vargas, P.N.; Penuela, M.C.; Cruz, A.P.; Prieto, A.; Pitman, N.; Quesada, C.; Salomao, R.; Silveira, M.; Schwarz, M.; Stropp, J.; Ramirez, F.; Ramirez, H.; Rudas, A.; ter Steege, H.; Silva, N.; Torres, A.; Terborgh, J.; Vasquez, R.; van der Heijden, G. |
Title |
Does the disturbance hypothesis explain the biomass increase in basin-wide Amazon forest plot data? |
Type |
Journal Article |
Year |
2009 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob. Change Biol. |
Volume |
15 |
Issue |
10 |
Pages |
2418-2430 |
Keywords |
Amazon rainforest; carbon sink; disturbance; mortality; power law |
Abstract |
Positive aboveground biomass trends have been reported from old-growth forests across the Amazon basin and hypothesized to reflect a large-scale response to exterior forcing. The result could, however, be an artefact due to a sampling bias induced by the nature of forest growth dynamics. Here, we characterize statistically the disturbance process in Amazon old-growth forests as recorded in 135 forest plots of the RAINFOR network up to 2006, and other independent research programmes, and explore the consequences of sampling artefacts using a data-based stochastic simulator. Over the observed range of annual aboveground biomass losses, standard statistical tests show that the distribution of biomass losses through mortality follow an exponential or near-identical Weibull probability distribution and not a power law as assumed by others. The simulator was parameterized using both an exponential disturbance probability distribution as well as a mixed exponential-power law distribution to account for potential large-scale blowdown events. In both cases, sampling biases turn out to be too small to explain the gains detected by the extended RAINFOR plot network. This result lends further support to the notion that currently observed biomass gains for intact forests across the Amazon are actually occurring over large scales at the current time, presumably as a response to climate change. |
Address |
[Gloor, M.; Phillips, O. L.; Lloyd, J. J.; Lewis, S. L.; Baker, T. R.; Lopez-Gonzalez, G.; Peacock, J.; Feldpausch, T. R.] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire, England, Email: eugloor@googlemail.com |
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Thesis |
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Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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Edition |
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ISSN |
1354-1013 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
ISI:000269577800006 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
196 |
Permanent link to this record |
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Author |
Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. |
Title |
Flowering as a key factor in ant-Philodendron interactions |
Type |
Journal Article |
Year |
2008 |
Publication |
Journal of Tropical Ecology |
Abbreviated Journal |
J. Trop. Ecol. |
Volume |
24 |
Issue |
|
Pages |
689-692 |
Keywords |
Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality |
Abstract |
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Address |
[Gibernau, Marc; Orivel, Jerome] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR CNRS 5174, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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Thesis |
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Publisher |
CAMBRIDGE UNIV PRESS |
Place of Publication |
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Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0266-4674 |
ISBN |
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Medium |
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Area |
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Conference |
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Notes |
ISI:000261254400012 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
128 |
Permanent link to this record |
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Author |
Barriault, I.; Barabe, D.; Cloutier, L.; Gibernau, M. |
Title |
Pollination ecology and reproductive success in Jack-in-the-pulpit (Arisaema triphyllum) in Quebec (Canada) |
Type |
Journal Article |
Year |
2010 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol. |
Volume |
12 |
Issue |
1 |
Pages |
161-171 |
Keywords |
Araceae; bisexual inflorescence; deceptive pollination; Mycetophilidae; pollen load; Thysanoptera; visitation rates |
Abstract |
Pollination ecology and reproductive success of Jack-in-the-pulpit (Arisaema triphyllum) were studied in two natural populations in Quebec, Canada. Individual A. triphyllum plants can be of three types: male, female or bisexual. In both populations studied, the presence of bisexual inflorescences was not negligible (13%), where 'female' and 'male' bisexual plants were categorised according to the relative number of stamens and ovaries. 'Male bisexual' plants produce only pollen and 'female bisexual' plants produce only fruit. Hence, A. triphyllum is a true dioecious plant, as each plant only reproduces through either the male or the female function. 'Female bisexual' plants were equivalent to female plants in terms of visitation rate by insects, fructification rate and production of berries and seeds. Neither agamospermy in female plants nor self-pollination in 'female bisexual' plants was found, thus A. triphyllum relies on insects for cross-pollination. Despite the long flowering cycle, a low visitation rate was documented: only 20-40% of inflorescences were visited, according to gender, by a mean of 1.5 insects. In this study, Mycetophilidae represented the most generically diversified and abundant family, as well as the most efficient insect pollinator, especially the genera Docosia and Mycetophila. |
Address |
[Gibernau, M.] Univ Toulouse 3, Lab Evolut & Divers Biol, UMR, CNRS, F-31062 Toulouse 9, France, Email: gibernau@cict.fr |
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Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
Place of Publication |
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Summary Language |
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Edition |
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ISSN |
1435-8603 |
ISBN |
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Medium |
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Notes |
ISI:000272589700017 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
89 |
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Author |
Fyllas, N.M.; Patino, S.; Baker, T.R.; Nardoto, G.B.; Martinelli, L.A.; Quesada, C.A.; Paiva, R.; Schwarz, M.; Horna, V.; Mercado, L.M.; Santos, A.; Arroyo, L.; Jimenez, E.M.; Luizao, F.J.; Neill, D.A.; Silva, N.; Prieto, A.; Rudas, A.; Silviera, M.; Vieira, I.C.G.; Lopez-Gonzalez, G.; Malhi, Y.; Phillips, O.L.; Lloyd, J. |
Title |
Basin-wide variations in foliar properties of Amazonian forest: phylogeny, soils and climate |
Type |
Journal Article |
Year |
2009 |
Publication |
Biogeosciences |
Abbreviated Journal |
Biogeosciences |
Volume |
6 |
Issue |
11 |
Pages |
2677-2708 |
Keywords |
|
Abstract |
We analysed 1040 individual trees, located in 62 plots across the Amazon Basin for leaf mass per unit area (M-A), foliar carbon isotopic composition (delta C-13) and leaf level concentrations of C, N, P, Ca, Mg, K and Al. All trees were identified to the species level with the dataset containing 58 families, 236 genera and 508 species, distributed across a wide range of soil types and precipitation regimes. Some foliar characteristics such as M-A, [C], [N] and [Mg] emerge as highly constrained by the taxonomic affiliation of tree species, but with others such as [P], [K], [Ca] and delta C-13 also strongly influenced by site growing conditions. By removing the environmental contribution to trait variation, we find that intrinsic values of most trait pairs coordinate, although different species ( characterised by different trait suites) are found at discrete locations along a common axis of coordination. Species that tend to occupy higher fertility soils are characterised by a lower M-A and have a higher intrinsic [N], [P], [K], [Mg] and delta C-13 than their lower fertility counterparts. Despite this consistency, different scaling patterns were observed between low and high fertility sites. Inter-relationships are thus substantially modified by growth environment. Analysing the environmental component of trait variation, we found soil fertility to be the most important predictor, influencing all leaf nutrient concentrations and delta C-13 and reducing M-A. Mean annual temperature was negatively associated with leaf level [N], [P] and [K] concentrations. Total annual precipitation positively influences M-A, [C] and delta C-13, but with a negative impact on [Mg]. These results provide a first basis for understanding the relationship between the physiological functioning and distribution of tree species across Amazonia. |
Address |
[Fyllas, N. M.; Baker, T. R.; Quesada, C. A.; Lopez-Gonzalez, G.; Phillips, O. L.; Lloyd, J.] Univ Leeds, Sch Geog, Earth & Biosphere Inst, Leeds LS2 9JT, W Yorkshire, England, Email: n.fyllas@leeds.ac.uk |
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Publisher |
COPERNICUS PUBLICATIONS |
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Summary Language |
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Original Title |
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Series Editor |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1726-4170 |
ISBN |
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Area |
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Conference |
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Notes |
ISI:000272232200025 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
92 |
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Author |
Freycon, V.; Krencker, M.; Schwartz, D.; Nasi, R.; Bonal, D. |
Title |
The impact of climate changes during the Holocene on vegetation in northern French Guiana |
Type |
Journal Article |
Year |
2010 |
Publication |
Quaternary Research |
Abbreviated Journal |
Quat. Res. |
Volume |
73 |
Issue |
2 |
Pages |
220-225 |
Keywords |
Holocene; Vegetation change; French Guiana; Carbon isotope composition; Soil organic matter |
Abstract |
The impact of climatic changes that occurred during the last glacial maximum and the Holocene on vegetation changes in the Amazon Basin and the Guiana Shield are still widely debated. The aim of our study was to investigate whether major changes in vegetation (i.e. transitions between rainforests and C-4 savannas) occurred in northern French Guiana during the Holocene. We measured variations in the delta C-13 of soil organic matter at eight sites now occupied by forest or savannah. The forest sites were selected to cover two regions (forest refugia and peneplains) which are thought to have experienced different intensities of disturbance during the latest Pleistocene and the Holocene. We found that none of the forest sites underwent major disturbances during the Holocene, i.e. they were not replaced by C-4 savannahs or C-4 forest savannahs for long periods. Our results thus suggest that tropical rainforests in northern French Guiana were resilient to drier climatic conditions during the Holocene. Nevertheless, geographical and vertical variations in the C-13 of SOM were compatible with minor changes in vegetation, variations in soil processes or in soil physical properties. (C) 2009 University of Washington. Published by Elsevier Inc. All rights reserved. |
Address |
[Freycon, Vincent] CIRAD, UR Dynam Forestiere, F-34398 Montpellier 5, France, Email: vincent.freycon@cirad.fr |
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Publisher |
ACADEMIC PRESS INC ELSEVIER SCIENCE |
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Edition |
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ISSN |
0033-5894 |
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Notes |
ISI:000275246700007 |
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no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
66 |
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Author |
Foucaud, J.; Orivel, J.; Loiseau, A.; Delabie, J.H.C.; Jourdan, H.; Konghouleux, D.; Vonshak, M.; Tindo, M.; Mercier, J.L.; Fresneau, D.; Mikissa, J.B.; McGlynn, T.; Mikheyev, A.S.; Oettler, J.; Estoup, A. |
Title |
Worldwide invasion by the little fire ant: routes of introduction and eco-evolutionary pathways |
Type |
Journal Article |
Year |
2010 |
Publication |
Evolutionary Applications |
Abbreviated Journal |
Evol. Appl. |
Volume |
3 |
Issue |
4 |
Pages |
363-374 |
Keywords |
biological invasion; introduction routes; parthenogenesis; reproduction system; Wasmannia auropunctata |
Abstract |
Biological invasions are generally thought to occur after human aided migration to a new range. However, human activities prior to migration may also play a role. We studied here the evolutionary genetics of introduced populations of the invasive ant Wasmannia auropunctata at a worldwide scale. Using microsatellite markers, we reconstructed the main routes of introduction of the species. We found three main routes of introduction, each of them strongly associated to human history and trading routes. We also demonstrate the overwhelming occurrence of male and female clonality in introduced populations of W. auropunctata, and suggest that this particular reproduction system is under selection in human-modified habitats. Together with previous researches focused on native populations, our results suggest that invasive clonal populations may have evolved within human modified habitats in the native range, and spread further from there. The evolutionarily most parsimonious scenario for the emergence of invasive populations of the little fire ant might thus be a two-step process. The W. auropunctata case illustrates the central role of humans in biological change, not only due to changes in migration patterns, but also in selective pressures over species. |
Address |
[Foucaud, Julien; Loiseau, Anne; Jourdan, Herve; Konghouleux, Djoel; Estoup, Arnaud] Montpellier SupAgro, INRA, UMR CBGP, IRD,Cirad, F-34988 Montferrier Sur Lez, France, Email: julien.foucaud@legs.cnrs-gif.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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Series Editor |
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Series Title |
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Series Issue |
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Edition |
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ISSN |
1752-4571 |
ISBN |
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Medium |
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Area |
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Conference |
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Notes |
ISI:000278913600004 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
79 |
Permanent link to this record |
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Author |
Foucaud, J.; Orivel, J.; Fournier, D.; Delabie, J.H.C.; Loiseau, A.; Le Breton, J.; Cerdan, P.; Estoup, A. |
Title |
Reproductive system, social organization, human disturbance and ecological dominance in native populations of the little fire ant, Wasmannia auropunctata |
Type |
Journal Article |
Year |
2009 |
Publication |
Molecular Ecology |
Abbreviated Journal |
Mol. Ecol. |
Volume |
18 |
Issue |
24 |
Pages |
5059-5073 |
Keywords |
biological invasion; clonality; human disturbance; parthenogenesis; social organization; Wasmannia auropunctata |
Abstract |
The invasive ant species Wasmannia auropunctata displays both ecologically dominant and non-dominant populations within its native range. Three factors could theoretically explain the ecological dominance of some native populations of W. auropunctata: (i) its clonal reproductive system, through demographic and/or adaptive advantages; (ii) its unicolonial social organization, through lower intraspecific and efficient interspecific competition; (iii) the human disturbance of its native range, through the modification of biotic and abiotic environmental conditions. We used microsatellite markers and behavioural tests to uncover the reproductive modes and social organization of dominant and non-dominant native populations in natural and human-modified habitats. Microsatellite and mtDNA data indicated that dominant and non-dominant native populations (supercolonies as determined by aggression tests) of W. auropunctata did not belong to different evolutionary units. We found that the reproductive system and the social organization are neither necessary nor sufficient to explain W. auropunctata ecological dominance. Dominance rather seems to be set off by unknown ecological factors altered by human activities, as all dominant populations were recorded in human-modified habitats. The clonal reproductive system found in some populations of W. auropunctata may however indirectly contribute to its ecological dominance by allowing the species to expand its environmental niche, through the fixation over time of specific combinations of divergent male and female genotypes. Unicoloniality may rather promote the range expansion of already dominant populations than actually trigger ecological dominance. The W. auropunctata model illustrates the strong impact of human disturbance on species' ecological features and the adaptive potential of clonal reproductive systems. |
Address |
[Foucaud, Julien; Fournier, Denis; Loiseau, Anne; Estoup, Arnaud] Montpellier SupAgro, Cirad, IRD, INRA,UMR CBGP, F-34988 Montferrier Sur Lez, France, Email: julien.foucaud@legs.cnrs-gif.fr |
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Publisher |
WILEY-BLACKWELL PUBLISHING, INC |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0962-1083 |
ISBN |
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Medium |
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Area |
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Conference |
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Notes |
ISI:000272452700009 |
Approved |
no |
Call Number |
EcoFoG @ eric.marcon @ |
Serial |
191 |
Permanent link to this record |