| Records |
| Author |
Falkowski, M.; Jahn-Oyac, A.; Odonne, G.; Flora, C.; Estevez, Y.; Touré, S.; Boulogne, I.; Robinson, J.-C.; Béreau, D.; Petit, P.; Azam, D.; Coke, M.; Issaly, J.; Gaborit, P.; Stien, D.; Eparvier, V.; Dusfour, I.; Houël, E. |
| Title |
Towards the optimization of botanical insecticides research: Aedes aegypti larvicidal natural products in French Guiana |
Type |
Journal Article |
| Year |
2020 |
Publication |
Acta Tropica |
Abbreviated Journal |
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| Volume |
201 |
Issue |
105179 |
Pages |
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| Keywords |
Amazonian chemodiversity; Chemical defense; Culicidae; Mosquito larvicides; Quasi-Poisson generalized linear model; Screening optimization |
Abstract  |
Natural products have proven to be an immeasurable source of bioactive compounds. The exceptional biodiversity encountered in Amazonia, alongside a rich entomofauna and frequent interactions with various herbivores is the crucible of a promising chemodiversity. This prompted us to search for novel botanical insecticides in French Guiana. As this French overseas department faces severe issues linked to insects, notably the strong incidence of vector-borne infectious diseases, we decided to focus our research on products able to control the mosquito Aedes aegypti. We tested 452 extracts obtained from 85 species originating from 36 botanical families and collected in contrasted environments against an Ae. aegypti laboratory strain susceptible to all insecticides, and a natural population resistant to both pyrethroid and organophosphate insecticides collected in Cayenne for the most active of them. Eight species (Maytenus oblongata Reissek, Celastraceae; Costus erythrothyrsus Loes., Costaceae; Humiria balsamifera Aubl., Humiriaceae; Sextonia rubra (Mez) van der Werff, Lauraceae; Piper hispidum Sw., Piperaceae; Laetia procera (Poepp.) Eichl., Salicaceae; Matayba arborescens (Aubl.) Radlk., Sapindaceae; and Cupania scrobitulata Rich., Sapindaceae) led to extracts exhibiting more than 50% larval mortality after 48 h of exposition at 100 µg/mL against the natural population and were considered active. Selectivity and phytochemistry of these extracts were therefore investigated and discussed, and some active compounds highlighted. Multivariate analysis highlighted that solvents, plant tissues, plant family and location had a significant effect on mortality while light, available resources and vegetation type did not. Through this case study we highlighted that plant defensive chemistry mechanisms are crucial while searching for novel insecticidal products. |
| Address |
INRS-Institut Armand Frappier, Groupe recherche en écologie microbienne, 531 boulevard des prairies, Laval, QC H7V 1B7, Canada |
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no |
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EcoFoG @ webmaster @ |
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888 |
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Goulamoussene, Y.; Bedeau, C.; Descroix, L.; Linguet, L.; Herault, B. |
| Title |
Environmental control of natural gap size distribution in tropical forests |
Type |
Journal Article |
| Year |
2017 |
Publication |
Biogeosciences |
Abbreviated Journal |
Biogeosciences |
| Volume |
14 |
Issue |
2 |
Pages |
353-364 |
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| Abstract |
Natural disturbances are the dominant form of forest regeneration and dynamics in unmanaged tropical forests. Monitoring the size distribution of treefall gaps is important to better understand and predict the carbon budget in response to land use and other global changes. In this study, we model the size frequency distribution of natural canopy gaps with a discrete power law distribution. We use a Bayesian framework to introduce and test, using Monte Carlo Markov chain and Kuo-Mallick algorithms, the effect of local physical environment on gap size distribution. We apply our methodological framework to an original light detecting and ranging dataset in which natural forest gaps were delineated over 30 000 ha of unmanaged forest. We highlight strong links between gap size distribution and environment, primarily hydrological conditions and topography, with large gaps being more frequent on floodplains and in wind-exposed areas. In the future, we plan to apply our methodological framework on a larger scale using satellite data. Additionally, although gap size distribution variation is clearly under environmental control, variation in gap size distribution in time should be tested against climate variability. © Author(s) 2017. |
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Cirad, UMR EcoFoG, AgroParisTech, CNRS, Inra, Univ Antilles, Univ Guyane, Kourou, French Guiana |
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Export Date: 7 February 2017 |
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no |
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EcoFoG @ webmaster @ |
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729 |
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Malé, P.-J.G.; Leroy, C.; Lusignan, L.; Petitclerc, F.; Quilichini, A.; Orivel, J. |
| Title |
The reproductive biology of the myrmecophyte, Hirtella physophora, and the limitation of negative interactions between pollinators and ants |
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Journal Article |
| Year |
2015 |
Publication |
Arthropod-Plant Interactions |
Abbreviated Journal |
Arthropod-Plant Interactions |
| Volume |
9 |
Issue |
1 |
Pages |
23-31 |
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Ant-plant; Ant–pollinator interactions; Floral structure and display; Plant reproductive biology; Spatial and temporal segregation |
| Abstract |
Myrmecophytism occurs in plants that offer ants a nesting space and, often, food rewards in exchange for protection from predators and competitors. Such biotic protection by ants can, however, interfere with the activity of pollinators leading to potential negative consequences for the plant’s reproduction. In this study, we focused on the association between the understory myrmecophyte, Hirtella physophora (Chrysobalanaceae), and its obligate ant partner, Allomerus decemarticulatus (Myrmicinae). We investigated the reproductive biology of H. physophora and the putative mechanisms that may limit ant–pollinator conflict. Our results show that H. physophora is an obligate outcrosser, self-incompatible, and potentially insect-pollinated species. The reproduction of H. physophora relies entirely on pollen transfer by pollinators that are likely quite specific. Potential interference between flower-visiting insects during pollination may also be lessened by a spatial and temporal segregation of ant and pollinator activities, thus enabling pollen transfer and fruit production. © 2014, Springer Science+Business Media Dordrecht. |
| Address |
IRD, UMR AMAP (botAnique et bioinforMatique de l’Architecture des Plantes), Boulevard de la Lironde, TA A-51/PS2Montpellier Cedex 5, France |
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| Notes |
Export Date: 9 April 2015 |
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no |
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EcoFoG @ webmaster @ |
Serial |
593 |
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| Author |
Orivel, J.; Lambs, L.; Male, P.J.G.; Leroy, C.; Grangier, J.; Otto, T.; Quilichini, A.; Dejean, A. |
| Title |
Dynamics of the association between a long-lived understory myrmecophyte and its specific associated ants |
Type |
Journal Article |
| Year |
2011 |
Publication |
Oecologia |
Abbreviated Journal |
Oecologia |
| Volume |
165 |
Issue |
2 |
Pages |
369-376 |
| Keywords |
Allomerus decemarticulatus; Hirtella physophora; Lifespan; Mutualism; Myrmecophyte |
| Abstract |
Myrmecophytic symbioses are widespread in tropical ecosystems and their diversity makes them useful tools for understanding the origin and evolution of mutualisms. Obligate ant-plants, or myrmecophytes, provide a nesting place, and, often, food to a limited number of plant-ant species. In exchange, plant-ants protect their host plants from herbivores, competitors and pathogens, and can provide them with nutrients. Although most studies to date have highlighted a similar global pattern of interactions in these systems, little is known about the temporal structuring and dynamics of most of these associations. In this study we focused on the association between the understory myrmecophyte Hirtella physophora (Chrysobalanaceae) and its obligate ant partner Allomerus decemarticulatus (Myrmicinae). An examination of the life histories and growth rates of both partners demonstrated that this plant species has a much longer lifespan (up to about 350 years) than its associated ant colonies (up to about 21 years). The size of the ant colonies and their reproductive success were strongly limited by the available nesting space provided by the host plants. Moreover, the resident ants positively affected the vegetative growth of their host plant, but had a negative effect on its reproduction by reducing the number of flowers and fruits by more than 50%. Altogether our results are important to understanding the evolutionary dynamics of ant-plant symbioses. The highly specialized interaction between long-lived plants and ants with a shorter lifespan produces an asymmetry in the evolutionary rates of the interaction which, in return, can affect the degree to which the interests of the two partners converge. |
| Address |
[Orivel, Jerome; Leroy, Celine; Quilichini, Angelique; Dejean, Alain] CNRS, UMR Ecol Forets Guyane, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf |
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Springer |
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0029-8549 |
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| Notes |
ISI:000286224900012 |
Approved |
no |
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EcoFoG @ webmaster @ |
Serial |
295 |
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| Author |
Dejean, A.; Leroy, C.; Corbara, B.; Cereghino, R.; Roux, O.; Herault, B.; Rossi, V.; Guerrero, R.J.; Delabie, J.H.C.; Orivel, J.; Boulay, R. |
| Title |
A temporary social parasite of tropical plant-ants improves the fitness of a myrmecophyte |
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Journal Article |
| Year |
2010 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
| Volume |
97 |
Issue |
10 |
Pages |
925-934 |
| Keywords |
Ant-plant relationships; Biotic defense; Parasites of mutualisms; Temporary social parasites; Azteca; Cecropia |
| Abstract |
Myrmecophytes offer plant-ants a nesting place in exchange for protection from their enemies, particularly defoliators. These obligate ant-plant mutualisms are common model systems for studying factors that allow horizontally transmitted mutualisms to persist since parasites of ant-myrmecophyte mutualisms exploit the rewards provided by host plants whilst providing no protection in return. In pioneer formations in French Guiana, Azteca alfari and Azteca ovaticeps are known to be mutualists of myrmecophytic Cecropia (Cecropia ants). Here, we show that Azteca andreae, whose colonies build carton nests on myrmecophytic Cecropia, is not a parasite of Azteca-Cecropia mutualisms nor is it a temporary social parasite of A. alfari; it is, however, a temporary social parasite of A. ovaticeps. Contrarily to the two mutualistic Azteca species that are only occasional predators feeding mostly on hemipteran honeydew and food bodies provided by the host trees, A. andreae workers, which also attend hemipterans, do not exploit the food bodies. Rather, they employ an effective hunting technique where the leaf margins are fringed with ambushing workers, waiting for insects to alight. As a result, the host trees' fitness is not affected as A. andreae colonies protect their foliage better than do mutualistic Azteca species resulting in greater fruit production. Yet, contrarily to mutualistic Azteca, when host tree development does not keep pace with colony growth, A. andreae workers forage on surrounding plants; the colonies can even move to a non-Cecropia tree. |
| Address |
[Dejean, Alain; Leroy, Celine; Roux, Olivier; Orivel, Jerome] CNRS, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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SPRINGER |
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0028-1042 |
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ISI:000282094100006 |
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no |
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EcoFoG @ eric.marcon @ |
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77 |
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Vantaux, A.; Roux, O.; Magro, A.; Orivel, J. |
| Title |
Evolutionary perspectives on myrmecophily in ladybirds |
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Journal Article |
| Year |
2012 |
Publication |
Psyche |
Abbreviated Journal |
Psyche |
| Volume |
591570 |
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Pages |
1-7 |
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| Abstract |
Myrmecophiles are species that usually have developed specialized traits to cope with the aggressiveness of ants enabling them to live in their vicinity. Many coccinellid species are predators of Hemiptera; the latter is also often protected by ants. Therefore these ladybirds frequently interact with ants, and some species have become myrmecophilous. In this paper, we aim to provide an overview of the evolution of myrmecophilous traits in ladybirds. We then discuss the costs and benefits of myrmecophily and the dietary shift to myrmecophagy observed in a few species. Copyright © 2012 Amélie Vantaux et al. |
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CNRS, UMR EcoFoG-Ecologie des Forêts de Guyane, Campus Agronomique, BP 316, 97379 Kourou Cedex, France |
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00332615 (Issn) |
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Export Date: 28 March 2012; Source: Scopus; Art. No.: 591570; doi: 10.1155/2012/591570; Language of Original Document: English; Correspondence Address: Vantaux, A.; Entomology Laboratory, Zoological Institute, Catholic University of Leuven, Naamsestraat 59, 3000 Leuven, Belgium; email: amelie.vantaux@gmail.com |
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no |
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EcoFoG @ webmaster @ |
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388 |
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Martos, F.; Dulormne, M.; Pailler, T.; Bonfante, P.; Faccio, A.; Fournel, J.; Dubois, M.-P.; Selosse, M.-A. |
| Title |
Independent recruitment of saprotrophic fungi as mycorrhizal partners by tropical achlorophyllous orchids |
Type |
Journal Article |
| Year |
2009 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytologist |
| Volume |
184 |
Issue |
3 |
Pages |
668-681 |
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Mycoheterotrophy; Mycorrhizas; Orchids; Rainforests; Saprotrophic fungi; Stable isotopes |
| Abstract |
Mycoheterotrophic orchids have adapted to shaded forest understory by shifting to achlorophylly and receiving carbon from their mycorrhizal fungi. In temperate forests, they associate in a highly specific way with fungi forming ectomycorrhizas on nearby trees, and exploiting tree photosynthates. However, many rainforests lack ectomycorrhizal fungi, and there is evidence that some tropical Asiatic species associate with saprotrophic fungi. To investigate this in different geographic and phylogenetic contexts, we identified the mycorrhizal fungi supporting two tropical mycoheterotrophic orchids from Mascarene (Indian Ocean) and Caribbean islands. We tested their possible carbon sources by measuring natural nitrogen (15N) and carbon (13C) abundances. Saprotrophic basidiomycetes were found: Gastrodia similis associates with a wood-decaying Resinicium (Hymenochaetales); Wullschlaegelia aphylla associates with both litter-decaying Gymnopus and Mycena species, whose rhizomorphs link orchid roots to leaf litter. The 15N and 13C abundances make plausible food chains from dead wood to G. similis and from dead leaves to W. aphylla. We propose that temperature and moisture in rainforests, but not in most temperate forests, may favour sufficient saprotrophic activity to support development of mycoheterotrophs. By enlarging the spectrum of mycorrhizal fungi and the level of specificity in mycoheterotrophic orchids, this study provides new insights on orchid and mycorrhizal biology in the tropics. © 2009 New Phytologist. |
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Dipartimento di Biologia Vegetale dell'Università, Istituto per la Protezione Delle Piante – CNR, Viale Mattioli 25, I-10125 Torino, Italy |
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Cited By :65; Export Date: 7 February 2017 |
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no |
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EcoFoG @ webmaster @ |
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728 |
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Menzel, F.; Orivel, J.; Kaltenpoth, M.; Schmitt, T. |
| Title |
What makes you a potential partner? Insights from convergently evolved ant-ant symbioses |
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Journal Article |
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2014 |
Publication |
Chemoecology |
Abbreviated Journal |
Chemoecology |
| Volume |
24 |
Issue |
3 |
Pages |
105-119 |
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Aggression; Coevolution; Cuticular hydrocarbons; Formicidae; Interspecific association; Parabiosis; Recognition cues |
| Abstract |
Mutualistic, commensalistic or parasitic interactions are unevenly distributed across the animals and plants: in certain taxa, such interspecific associations evolved more often than in others. Within the ants, associations between species of the genera Camponotus and Crematogaster evolved repeatedly and include trail-sharing associations, where two species share foraging trails, and parabioses, where two species share a nest without aggression. Camponotus and Crematogaster may possess life-history traits that favour the evolution of associations. To identify which traits are affected by the association, we investigated a neotropical parabiosis of Ca. femoratus and Cr. levior and compared it to a paleotropical parabiosis and a trail-sharing association. The two neotropical species showed altered cuticular hydrocarbon profiles compared to non-parabiotic species accompanied by low levels of interspecific aggression. Both species occurred in two chemically distinct types. Camponotus followed artificial trails of Crematogaster pheromones, but not vice versa. The above traits were also found in the paleotropical parabiosis, and the trail-following results match those of the trail-sharing association. In contrast to paleotropical parabioses, however, Camponotus was dominant, had a high foraging activity and often fought against Crematogaster over food resources. We suggest three potential preadaptations for parabiosis. First, Crematogaster uses molecules as trail pheromones, which can be perceived by Camponotus, too. Second, nests of Camponotus are an important benefit to Crematogaster and may create a selection pressure for the latter to tolerate Camponotus. Third, there are parallel, but unusual, shifts in cuticular hydrocarbon profiles between neotropics and paleotropics, and between Camponotus and Crematogaster. © 2014 Springer Basel. |
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Department of Animal Ecology and Tropical Biology Biocentre, University of Würzburg, Am Hubland, 97074 Würzburg, Germany |
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Birkhauser Verlag AG |
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09377409 (Issn) |
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Export Date: 10 June 2014; Coden: Chmoe; Correspondence Address: Menzel, F.; Department of Evolutionary Biology, Institute of Zoology, University of Mainz, Johannes-von-Müller-Weg 6, 55099 Mainz, Germany; email: menzelf@uni-mainz.de |
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no |
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EcoFoG @ webmaster @ |
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547 |
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Orivel, J.; Leroy, C. |
| Title |
The diversity and ecology of ant gardens (Hymenoptera: Formicidae; Spermatophyta: Angiospermae) |
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Journal Article |
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2011 |
Publication |
Myrmecological News |
Abbreviated Journal |
Myrmecol. News |
| Volume |
14 |
Issue |
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Pages |
73-85 |
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Ant-plant interactions; epiphytes; mutualisms; Neotropics; Paleotropics; phytotelm; parabiosis; seed dispersal; review |
| Abstract |
Mutualistic interactions between ants and plants are important features of many ecosystems, and they can be divided into three main categories: dispersal and protective mutualisms and myrmecotrophy. In both the Neotropics and the Southeastern Asian Paleotropics, ant gardens (AGs), a particular type of ant-plant interaction, are frequent. To initiate AGs, ants integrate the seeds of certain epiphyte species into the carton of their nest. The development of the plants leads to the formation of a cluster of epiphytes rooted in the carton. They have been defined as one of the most complex associations between ants and plants known because of the plurispecific, but also specialized nature of the association involving several phylogenetically-distant ant and plant species. The aim of this review is to provide a synthesis of the diversity and ecology of AGs, including the outcomes experienced by the partners in the interaction and the direct and indirect impacts ant-garden ants have on the plant and arthropod communities. |
| Address |
[Orivel, Jerome; Leroy, Celine] CNRS, UMR Ecol Forets Guyane, Kourou 97379, French Guiana, Email: jerome.orivel@ecofog.gf |
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OESTERREICHISCHE GESELL ENTOMOFAUNISTIK, C/O NATURHISTOR MUSEUM WIEN |
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1994-4136 |
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ISI:000286844100009 |
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no |
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EcoFoG @ webmaster @ |
Serial |
292 |
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Dejean, A.; Orivel, J.; Rossi, V.; Roux, O.; Lauth, J.; Malé, P.-J.G.; Céréghino, R.; Leroy, C. |
| Title |
Predation Success By A Plant-Ant Indirectly Favours The Growth And Fitness Of Its Host Myrmecophyte |
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Journal Article |
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2013 |
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PLoS ONE |
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8 |
Issue |
3 |
Pages |
e59405 |
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| Abstract |
Mutualisms, or interactions between species that lead to net fitness benefits for each species involved, are stable and ubiquitous in nature mostly due to “byproduct benefits” stemming from the intrinsic traits of one partner that generate an indirect and positive outcome for the other. Here we verify if myrmecotrophy (where plants obtain nutrients from the refuse of their associated ants) can explain the stability of the tripartite association between the myrmecophyte Hirtella physophora, the ant Allomerus decemarticulatus and an Ascomycota fungus. The plant shelters and provides the ants with extrafloral nectar. The ants protect the plant from herbivores and integrate the fungus into the construction of a trap that they use to capture prey; they also provide the fungus and their host plant with nutrients. During a 9-month field study, we over-provisioned experimental ant colonies with insects, enhancing colony fitness (i.e., more winged females were produced). The rate of partial castration of the host plant, previously demonstrated, was not influenced by the experiment. Experimental plants showed higher δ15N values (confirming myrmecotrophy), plus enhanced vegetative growth (e.g., more leaves produced increased the possibility of lodging ants in leaf pouches) and fitness (i.e., more fruits produced and more flowers that matured into fruit). This study highlights the importance of myrmecotrophy on host plant fitness and the stability of ant-myrmecophyte mutualisms. © 2013 Dejean et al. |
| Address |
IRD, AMAP (botAnique et bioinforMatique de l'Architecture des Plantes; UMR-IRD 123), Montpellier, France |
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Export Date: 26 March 2013; Source: Scopus; Art. No.: e59405 |
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no |
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EcoFoG @ webmaster @ |
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478 |
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