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Barraza, F.; Schreck, E.; Lévêque, T.; Uzu, G.; Lopez, F.; Ruales, J.; Prunier, J.; Marquet, A.; Maurice, L. |
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Cadmium bioaccumulation and gastric bioaccessibility in cacao: A field study in areas impacted by oil activities in Ecuador |
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Journal Article |
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2017 |
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Environmental Pollution |
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229 |
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950-963 |
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Cacao; Cadmium; Ecuador; Health risk assessment; Uptake and bioaccumulation |
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Cacao from South America is especially used to produce premium quality chocolate. Although the European Food Safety Authority has not established a limit for cadmium (Cd) in chocolate raw material, recent studies demonstrate that Cd concentrations in cacao beans can reach levels higher than the legal limits for dark chocolate (0.8 mg kg−1, effective January 1st, 2019). Despite the fact that the presence of Cd in agricultural soils is related to contamination by fertilizers, other potential sources must be considered in Ecuador. This field study was conducted to investigate Cd content in soils and cacao cultivated on Ecuadorian farms in areas impacted by oil activities. Soils, cacao leaves, and pod husks were collected from 31 farms in the northern Amazon and Pacific coastal regions exposed to oil production and refining and compared to two control areas. Human gastric bioaccessibility was determined in raw cacao beans and cacao liquor samples in order to assess potential health risks involved. Our results show that topsoils (0–20 cm) have higher Cd concentrations than deeper layers, exceeding the Ecuadorian legislation limit in 39% of the sampling sites. Cacao leaves accumulate more Cd than pod husks or beans but, nevertheless, 50% of the sampled beans have Cd contents above 0.8 mg kg−1. Root-to-cacao transfer seems to be the main pathway of Cd uptake, which is not only regulated by physico-chemical soil properties but also agricultural practices. Additionally, natural Cd enrichment by volcanic inputs must not be neglected. Finally, Cd in cacao trees cannot be considered as a tracer of oil activities. Assuming that total Cd content and its bioaccessible fraction (up to 90%) in cacao beans and liquor is directly linked to those in chocolate, the health risk associated with Cd exposure varies from low to moderate. |
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Laboratoire des Sciences du Bois, UMR EcoFoG, ZI Pariacabo, Kourou, French Guiana |
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Cited By :1; Export Date: 4 June 2018 |
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EcoFoG @ webmaster @ |
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806 |
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Pickett, K.M.; Carpenter, J.M.; Dejean, A. |
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“Basal” but not primitive: the nest of Apoica arborea de Saussure, 1854 (Insecta, Hymenoptera, Vespidae, Polistinae) |
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Journal Article |
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2009 |
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Zoosystema |
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Zoosystema |
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31 |
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4 |
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945-948 |
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Insecta; Hymenoptera; Vespidae; Polistinae; Apoica; social wasps; nest architecture; mosaic evolution |
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The first nest of Apoica arborea ever collected is reported. Characteristics of the unusual nest design are discussed relative to other members of the genus Apoica and other epiponine genera. The characteristics of its nest architecture are a mosaic of primitive and derived features for the Polistinae, and thus the nest design is not properly interpreted as the primitive condition from which other swarm-founding wasp nest designs are derived. The frequent conflation of “basal” and primitive is discussed. |
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[Pickett, Kurt M.] Univ Vermont, Dept Biol, Burlington, VT 05401 USA, Email: kurt.pickett@uvm.edu |
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PUBLICATIONS SCIENTIFIQUES DU MUSEUM, PARIS |
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ISI:000273733000008 |
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EcoFoG @ eric.marcon @ |
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188 |
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Talaga, S.; Dejean, A.; Azémar, F.; Dumont, Y.; Leroy, C. |
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Impacts of biotic and abiotic parameters on immature populations of Aedes aegypti |
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2020 |
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Journal of Pest Science |
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J. Pest Sci. |
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93 |
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3 |
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941-952 |
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Biocontrol agents; Competition; Ecosystem services; Mosquito control; Mosquito management; Predation; abiotic factor; biotic factor; competitive displacement; disease vector; maturation; mosquito; pest control; Aedes aegypti; Hexapoda; Zika virus |
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In recent centuries, the mosquito Aedes aegypti has spread into most urban areas throughout the tropics. This species is considered the main vector of the chikungunya, dengue, yellow fever and Zika viruses and causes major public health issues. The aim of this study is to investigate the relative influence of biotic and abiotic parameters on immature populations of Ae. aegypti. During a one-year-long field experiment, we monitored 108 macroinvertebrate aquatic communities inhabiting four types of water containers across three different urbanized sites in a Neotropical city. A multimodel inference approach revealed that, in addition to abiotic parameters, biotic interactions with aquatic organisms had an important influence on the abundance of Ae. aegypti and that the urbanized site considered influences the outcomes of the interactions. Controphic species other than mosquitoes aided Ae. aegypti development, suggesting a mechanism of facilitation through a chain of processes. However, the abundance of Ae. aegypti was lowered by competition with native mosquito species in the slightly urbanized area and by predation in more urbanized areas. Competitive displacement and reduction, as well as predation by native aquatic organisms, can be considered a form of ecosystem service. The conservation and/or augmentation of natural enemies should improve the short- and long-term success of incompatible and/or sterile insect techniques, thus opening up perspectives for the future of mosquito management. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature. |
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University of Pretoria, Department of Mathematics and Applied Mathematics, Pretoria, South Africa |
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16124758 (Issn) |
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EcoFoG @ webmaster @ |
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962 |
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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. |
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A temporary social parasite of tropical plant-ants improves the fitness of a myrmecophyte |
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2010 |
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Naturwissenschaften |
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Naturwissenschaften |
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97 |
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10 |
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925-934 |
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Ant-plant relationships; Biotic defense; Parasites of mutualisms; Temporary social parasites; Azteca; Cecropia |
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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. |
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[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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EcoFoG @ eric.marcon @ |
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77 |
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Levis, C.; Costa, F.R.C.; Bongers, F.; Peña-Claros, M.; Clement, C.R.; Junqueira, A.B.; Neves, E.G.; Tamanaha, E.K.; Figueiredo, F.O.G.; Salomão, R.P.; Castilho, C.V.; Magnusson, W.E.; Phillips, O.L.; Guevara, J.E.; Sabatier, D.; Molino, J.-F.; López, D.C.; Mendoza, A.M.; Pitman, N.C.A.; Duque, A.; Vargas, P.N.; Zartman, C.E.; Vasquez, R.; Andrade, A.; Camargo, J.L.; Feldpausch, T.R.; Laurance, S.G.W.; Laurance, W.F.; Killeen, T.J.; Nascimento, H.E.M.; Montero, J.C.; Mostacedo, B.; Amaral, I.L.; Guimarães Vieira, I.C.; Brienen, R.; Castellanos, H.; Terborgh, J.; Carim, M. de J.V.; Guimarães, J.R. da S.; Coelho, L. de S.; Matos, F.D. de A.; Wittmann, F.; Mogollón, H.F.; Damasco, G.; Dávila, N.; García-Villacorta, R.; Coronado, E.N.H.; Emilio, T.; Filho, D. de A.L.; Schietti, J.; Souza, P.; Targhetta, N.; Comiskey, J.A.; Marimon, B.S.; Marimon, B.-H.; Neill, D.; Alonso, A.; Arroyo, L.; Carvalho, F.A.; de Souza, F.C.; Dallmeier, F.; Pansonato, M.P.; Duivenvoorden, J.F.; Fine, P.V.A.; Stevenson, P.R.; Araujo-Murakami, A.; Aymard C., G.A.; Baraloto, C.; do Amaral, D.D.; Engel, J.; Henkel, T.W.; Maas, P.; Petronelli, P.; Revilla, J.D.C.; Stropp, J.; Daly, D.; Gribel, R.; Paredes, M.R.; Silveira, M.; Thomas-Caesar, R.; Baker, T.R.; da Silva, N.F.; Ferreira, L.V.; Peres, C.A.; Silman, M.R.; Cerón, C.; Valverde, F.C.; Di Fiore, A.; Jimenez, E.M.; Mora, M.C.P.; Toledo, M.; Barbosa, E.M.; Bonates, L.C. de M.; Arboleda, N.C.; Farias, E. de S.; Fuentes, A.; Guillaumet, J.-L.; Jørgensen, P.M.; Malhi, Y.; de Andrade Miranda, I.P.; Phillips, J.F.; Prieto, A.; Rudas, A.; Ruschel, A.R.; Silva, N.; von Hildebrand, P.; Vos, V.A.; Zent, E.L.; Zent, S.; Cintra, B.B.L.; Nascimento, M.T.; Oliveira, A.A.; Ramirez-Angulo, H.; Ramos, J.F.; Rivas, G.; Schöngart, J.; Sierra, R.; Tirado, M.; van der Heijden, G.; Torre, E.V.; Wang, O.; Young, K.R.; Baider, C.; Cano, A.; Farfan-Rios, W.; Ferreira, C.; Hoffman, B.; Mendoza, C.; Mesones, I.; Torres-Lezama, A.; Medina, M.N.U.; van Andel, T.R.; Villarroel, D.; Zagt, R.; Alexiades, M.N.; Balslev, H.; Garcia-Cabrera, K.; Gonzales, T.; Hernandez, L.; Huamantupa-Chuquimaco, I.; Manzatto, A.G.; Milliken, W.; Cuenca, W.P.; Pansini, S.; Pauletto, D.; Arevalo, F.R.; Reis, N.F.C.; Sampaio, A.F.; Giraldo, L.E.U.; Sandoval, E.H.V.; Gamarra, L.V.; Vela, C.I.A.; ter Steege, H. |
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Persistent effects of pre-Columbian plant domestication on Amazonian forest composition |
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Journal Article |
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2017 |
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Science |
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355 |
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6328 |
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925-931 |
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The marks of prehistoric human societies on tropical forests can still be detected today. Levis et al. performed a basin-wide comparison of plant distributions, archaeological sites, and environmental data. Plants domesticated by pre-Columbian peoples are much more likely to be dominant in Amazonian forests than other species. Furthermore, forests close to archaeological sites often have a higher abundance and richness of domesticated species. Thus, modern-day Amazonian tree communities across the basin remain largely structured by historical human use.Science, this issue p. 925The extent to which pre-Columbian societies altered Amazonian landscapes is hotly debated. We performed a basin-wide analysis of pre-Columbian impacts on Amazonian forests by overlaying known archaeological sites in Amazonia with the distributions and abundances of 85 woody species domesticated by pre-Columbian peoples. Domesticated species are five times more likely than nondomesticated species to be hyperdominant. Across the basin, the relative abundance and richness of domesticated species increase in forests on and around archaeological sites. In southwestern and eastern Amazonia, distance to archaeological sites strongly influences the relative abundance and richness of domesticated species. Our analyses indicate that modern tree communities in Amazonia are structured to an important extent by a long history of plant domestication by Amazonian peoples. |
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EcoFoG @ webmaster @ |
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739 |
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Roy, M.; Vasco-Palacios, A.; Geml, J.; Buyck, B.; Delgat, L.; Giachini, A.; Grebenc, T.; Harrower, E.; Kuhar, F.; Magnago, A.; Rinaldi, A.C.; Schimann, H.; Selosse, M.-A.; Sulzbacher, M.A.; Wartchow, F.; Neves, M.-A. |
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The (re)discovery of ectomycorrhizal symbioses in Neotropical ecosystems sketched in Florianópolis |
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2017 |
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New Phytologist |
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New Phytologist |
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214 |
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3 |
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920-923 |
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barcoding; biodiversity; ectomycorrhizal fungi; ectomycorrhizal roots; ectomycorrhizal symbioses; fruitbodies; Neotropical ecosystems |
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Departamento de Sistemática e Ecologia/CCEN, Laboratório de Morfo-Taxonomia Fúngica, Universidade Federal da Paraíba, João Pessoa, Paraíba, Brazil |
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Cited By :1; Export Date: 23 April 2017 |
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EcoFoG @ webmaster @ |
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749 |
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Leroy, C.; Carrias, J.-F.; Corbara, B.; Pélozuelo, L.; Dezerald, O.; Brouard, O.; Dejean, A.; Céréghino, R. |
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Mutualistic ants contribute to tank-bromeliad nutrition |
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2013 |
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Annals of Botany |
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Ann. Bot. |
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112 |
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5 |
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919-926 |
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δ15N; Algae; ants; Bromeliaceae; food webs; Formicinae; French Guiana; mutualistic interactions; nitrogen; phytotelmata; stable isotopes; tank bromeliad |
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Background and AimsEpiphytism imposes physiological constraints resulting from the lack of access to the nutrient sources available to ground-rooted plants. A conspicuous adaptation in response to that lack is the phytotelm (plant-held waters) of tank-bromeliad species that are often nutrient-rich. Associations with terrestrial invertebrates also result in higher plant nutrient acquisition. Assuming that tank-bromeliads rely on reservoir-assisted nutrition, it was hypothesized that the dual association with mutualistic ants and the phytotelm food web provides greater nutritional benefits to the plant compared with those bromeliads involved in only one of these two associations.MethodsQuantitative (water volume, amount of fine particulate organic matter, predator/prey ratio, algal density) and qualitative variables (ant-association and photosynthetic pathways) were compared for eight tank- and one tankless-bromeliad morphospecies from French Guiana. An analysis was also made of which of these variables affect nitrogen acquisition (leaf N and δ15N).Key ResultsAll variables were significantly different between tank-bromeliad species. Leaf N concentrations and leaf δ15N were both positively correlated with the presence of mutualistic ants. The amount of fine particulate organic matter and predator/prey ratio had a positive and negative effect on leaf δ15N, respectively. Water volume was positively correlated with leaf N concentration whereas algal density was negatively correlated. Finally, the photosynthetic pathway (C3 vs. CAM) was positively correlated with leaf N concentration with a slightly higher N concentration for C 3-Tillandsioideae compared with CAM-Bromelioideae.ConclusionsThe study suggests that some of the differences in N nutrition between bromeliad species can be explained by the presence of mutualistic ants. From a nutritional standpoint, it is more advantageous for a bromeliad to use myrmecotrophy via its roots than to use carnivory via its tank. The results highlight a gap in our knowledge of the reciprocal interactions between bromeliads and the various trophic levels (from bacteria to large metazoan predators) that intervene in reservoir-assisted nutrition. © The Author 2013. |
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CNRS, UMR 8172, Écologie des Forêts de Guyane, Campus Agronomique, F-97379 Kourou cedex, France |
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Export Date: 9 September 2013; Source: Scopus; Coden: Anboa; doi: 10.1093/aob/mct147; Language of Original Document: English; Correspondence Address: Leroy, C.; IRD, UMR AMAP (BotAnique et BioinforMatique de l'Architecture des Plantes), Boulevard de la Lironde, TA A-51/PS2, F-34398 Montpellier Cedex 5, France; email: celine.leroy@ird.fr |
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501 |
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Delnatte, C.; Meyer, J.-Y. |
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Plant introduction, naturalization, and invasion in French Guiana (South America) |
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2012 |
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Biological Invasions |
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Biol. Invasions |
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14 |
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5 |
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915-927 |
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Acacia mangium; French Guiana; Invasive plant; Melaleuca quinquenervia; Naturalization; Savanna |
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Continental tropical ecosystems are generally viewed as less vulnerable to biological invasions than island ones. Their apparent resistance to invasive alien species is often attributed to their higher native biota diversity and complexity. However, with the increase of human activities and disturbances and the accelerate rate of introductions of plant species, these apparently resilient continental ecosystems are now experiencing alien plant naturalization and invasion events. In order to illustrate this emergent phenomenon, we compiled a list of all known introduced and naturalized plant species in French Guiana (Guiana Shield, South America). A total of 490 alien plants were recorded, about 34% of which are currently naturalized, mainly species belonging to the Acanthaceae and Fabaceae (Faboideae) in the Eudicotyledons, and Poaceae (grasses) and Arecaceae (palms) in the Monocotyledons. The coastal dry and wet savannas appears to be vulnerable to plant invasion (with 165 naturalized species, about 34% of the alien flora), especially by Acacia mangium (Mimosaceae) and Melaleuca quinquenervia (Myrtaceae) which are forming localized but dense monotypic stands. Both tree species, intentionnally introduced for reforestation, rehabilitation, and as garden ornamentals and have the potential to spread with increasing human disturbances The number and abundance of naturalized alien plants in the relatively undisturbed tropical lowland rainforests and savannas remains still very low. Therefore, surveillance, early detection, and eradication of potential plant invaders are crucial; moreover collaboration with neighbouring countries of the Guiana Shield is essential to prevent the introduction of potentially invasive species which are still not present in French Guiana. © 2011 Springer Science+Business Media B.V. |
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Export Date: 2 May 2012; Source: Scopus; Coden: Blinf; doi: 10.1007/s10530-011-0129-1; Language of Original Document: English; Correspondence Address: Delnatte, C.; Herbier de Guyane, Institut de Recherche pour le Développement, B.P. 165, Cayenne, French Guiana; email: cesar_delnatte@yahoo.fr |
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Groc, S.; Delabie, J.H.C.; Cereghino, R.; Orivel, J.; Jaladeau, F.; Grangier, J.; Mariano, C.S.F.; Dejean, A. |
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Title |
Ant species diversity in the 'Grands Causses' (Aveyron, France): In search of sampling methods adapted to temperate climates RID C-4034-2011 |
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Journal Article |
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Year |
2007 |
Publication |
Comptes Rendus Biologies |
Abbreviated Journal |
C. R. Biol. |
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Volume |
330 |
Issue |
12 |
Pages |
913-922 |
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Keywords |
ant diversity; Grands Causses; sampling methods; temperate climate |
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Abstract |
This study aimed at showing the applicability of using a combination of four sampling methods (i.e., Winkler extractors, pitfall traps, baiting and manual collection), something most often conducted in the tropics, to create an inventory of ant species diversity in temperate environments. We recorded a total of 33 ant species in the Grands Causses by comparing three vegetal formations: a steppic lawn ('causse' sensu stricto), which was the most species-rich (29 species), followed by an oak grove (22 species) and a pine forest (17 species). No sampling method alone is efficient enough to provide an adequate sampling, but their combination permits one to make a suitable inventory of the myrmecofauna and to obtain information on the ecology of these ant species. |
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Address |
[Groc, S; Orivel, J; Grangier, J; Dejean, A] Univ Toulouse 3, CNRS, UMR 5174, Lab Evolut & Diversite Biol, F-31062 Toulouse, France, Email: alain.dejean@wanadoo.fr |
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Elsevier France-Editions Scientifiques Medicales Elsevier |
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English |
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ISSN |
1631-0691 |
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Notes |
WOS:000251852800009 |
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EcoFoG @ webmaster @ |
Serial |
359 |
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Author |
Dejean, A.; Revel, M.; Azémar, F.; Roux, O. |
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Title |
Altruism during predation in an assassin bug |
Type |
Journal Article |
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Year |
2013 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
100 |
Issue |
10 |
Pages |
913-922 |
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Keywords |
Conspecific tolerance; Predation; Prey sharing; Reduviidae; Zelus annulosus |
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Abstract |
Zelus annulosus is an assassin bug species mostly noted on Hirtella physophora, a myrmecophyte specifically associated with the ant Allomerus decemarticulatus known to build traps on host tree twigs to ambush insect preys. The Z. annulosus females lay egg clutches protected by a sticky substance. To avoid being trapped, the first three instars of nymphs remain grouped in a clutch beneath the leaves on which they hatched, yet from time to time, they climb onto the upper side to group ambush preys. Long-distance prey detection permits these bugs to capture flying or jumping insects that alight on their leaves. Like some other Zelus species, the sticky substance of the sundew setae on their forelegs aids in prey capture. Group ambushing permits early instars to capture insects that they then share or not depending on prey size and the hunger of the successful nymphs. Fourth and fifth instars, with greater needs, rather ambush solitarily on different host tree leaves, but attract siblings to share large preys. Communal feeding permits faster prey consumption, enabling small nymphs to return sooner to the shelter of their leaves. By improving the regularity of feeding for each nymph, it likely regulates nymphal development, synchronizing molting and subsequently limiting cannibalism. © 2013 Springer-Verlag Berlin Heidelberg. |
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Address |
IRD, Maladies Infectieuses et Vecteurs, Ecologie, Genetique, Evolution et Controle (UMR-IRD 224), IRD 01, BP 171, Bobo-Dioulasso, Burkina Faso |
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00281042 (Issn) |
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Notes |
Export Date: 30 October 2013; Source: Scopus; Coden: Natwa; doi: 10.1007/s00114-013-1091-9; Language of Original Document: English; Correspondence Address: Dejean, A.; Écologie des Forêts de Guyane, Campus Agronomique, BP 316, 97379 Kourou cedex, France; email: alain.dejean@wanadoo.fr |
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EcoFoG @ webmaster @ |
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508 |
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