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Leroy, C.; Corbara, B.; Dejean, A.; Céréghino, R. |
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Title |
Potential sources of nitrogen in an ant-garden tank-bromeliad |
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Journal Article |
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2009 |
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Plant Signaling and Behavior |
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Plant. Signal. Behav. |
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4 |
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9 |
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868-870 |
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Aechmea mertensii Camponotus femoratus nitrogen nitrogen stable isotope Pachycondyla goeldii plant-insect interactions phytotelmata |
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Epiphytic plants in general and bromeliads in particular live in a water and nutrient-stressed environment often limited in nitrogen. Thus, these plants have developed different ways to survive in such an environment. We focused on Aechmea mertensii (Bromeliaceae), which is both a tank-bromeliad and an ant-garden (AG) epiphyte initiated by either the ants Camponotus femoratus or Pachycondyla goeldii. By combining a study of plant morphology and physiology associated with aquatic insect biology, we demonstrate that the ant species influences the leaf structure of the bromeliad, the structure of the aquatic community in its tank, and nutrient assimilation by the leaves. Based on nitrogen and nitrogen stable isotope measurements of the A. mertensii leaves, the leaf litter inside of the tank and the root-embedded carton nest, we discuss the potential sources of available nitrogen for the plant based on the ant partner. We demonstrate the existence of a complex ant-plant interaction that subsequently affects the biodiversity of a broader range of organisms that are themselves likely to influence nutrient assimilation by the A. mertensii leaves in a kind of plant-invertebrate-plant feedback loop. |
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Potential sources of nitrogen in an ant-garden tank-bromeliad |
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EcoFoG @ eric.marcon @ 12 |
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186 |
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Carrias, J.-F.; Brouard, O.; Leroy, C.; Céréghino, R.; Pélozuelo, L.; Dejean, A.; Corbara, B. |
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An ant-plant mutualism induces shifts in the protist community structure of a tank-bromeliad |
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Journal Article |
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2012 |
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Basic and Applied Ecology |
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13 |
Issue |
8 |
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698-705 |
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Aechmea mertensii; Ant-garden; Biodiversity; Camponotus femoratus; French Guiana; Pachycondyla goeldii; Phytotelmata; Protists |
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Although ants may induce community-wide effects via changes in physical habitats in terrestrial environments, their influence on aquatic communities living in plant-held waters remains largely underexplored. The neotropical tank-bromeliad Aechmea mertensii (Bromeliaceae) occurs along forest edges in ant-gardens initiated by Camponotus femoratus or by Pachycondyla goeldii. Its leaves form wells that hold rainwater and provide suitable habitats for many aquatic organisms. We postulated that these ant-plant mutualisms indirectly affect the microbial community structure via changes in the environmental conditions experienced by the plants. To test this hypothesis, we analyzed the protist communities from 63 tank-bromeliads associated with either C. femoratus or P. goeldii (hereafter Cf-Aechmea and Pg-Aechmea) along a forest edge in French Guiana. For each plant, a large number of environmental variables (including habitat structure, food resources, incident radiation and the presence of aquatic invertebrates) were quantified to determine their relative importance in driving any observed differences across ant-associated plants. Pg-Aechmea are located in sun-exposed areas and hold low volumes of water and low amounts of detritus, whereas Cf-Aechmea are located in partially shaded areas and accumulate higher amounts of water and detritus. Protists (i.e., protozoa and algae) inhabiting Cf-Aechmea exhibit greater richness and abundances than those in Pg-Aechmea. Variations in detritus content, number of leaves, incident radiation, and the epiphyte richness of the ant-garden were the main factors explaining the variation in protist richness. A shift in the functional group composition of protists between bromeliads tended by different ant species suggested that mutualistic ants indirectly mediate changes in the microbial food web. © 2012 Gesellschaft für Ökologie. |
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Université de Toulouse; UPS, 118 route de Narbonne, 31062 Toulouse, France |
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Export Date: 14 December 2012; Source: Scopus |
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EcoFoG @ webmaster @ |
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449 |
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Cereghino, R.; Leroy, C.; Dejean, A.; Corbara, B. |
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Title |
Ants mediate the structure of phytotelm communities in an ant-garden bromeliad |
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Journal Article |
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Year |
2010 |
Publication |
Ecology |
Abbreviated Journal |
Ecology |
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Volume |
91 |
Issue |
5 |
Pages |
1549-1556 |
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Aechmea mertensii; ant-gardens; biodiversity; bromeliads; Camponotus femoratus; Crematogaster levior; macroinvertebrates; mutualism; Pachycondyla goeldii; phytotelmata; secondary forest; Sinnamary; French Guiana; species interactions |
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The main theories explaining the biological diversity of rain forests often confer a limited understanding of the contribution of interspecific interactions to the observed patterns. We show how two-species mutualisms can affect much larger segments of the invertebrate community in tropical rain forests. Aechmea mertensii (Bromeliaceae) is both a phytotelm (plant-held water) and an ant-garden epiphyte. We studied the influence of its. associated ant species (Pachycondyla goeldii and Camponotus femoratus) on the physical characteristics of the plants, and, subsequently, on the diversity of the invertebrate communities that inhabit their tanks. As dispersal agents for the bromeliads, P. goeldii and C. femoratus influence the shape and size of the bromeliad by determining the location of the seedling, from exposed to partially shaded areas. By coexisting on a local scale, the two ant species generate a gradient of habitat conditions in terms of available resources (space and food) for aquatic invertebrates, the diversity of the invertebrate communities increasing with greater volumes of water and fine detritus. Two-species mutualisms are widespread in nature, but their influence on the diversity of entire communities remains largely unexplored. Because macroinvertebrates constitute an important part of animal production in all ecosystem types, further investigations should address the functional implications of such indirect effects. |
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[Cereghino, Regis] Univ Toulouse, UPS, INPT, Lab Ecol Fonct,EcoLab, F-31062 Toulouse, France, Email: cereghin@cict.fr |
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ECOLOGICAL SOC AMER |
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0012-9658 |
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ISI:000277867600030 |
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EcoFoG @ eric.marcon @ |
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59 |
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Leroy, C.; Corbara, B.; Dejean, A.; Cereghino, R. |
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Title |
Ants mediate foliar structure and nitrogen acquisition in a tank-bromeliad |
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Journal Article |
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Year |
2009 |
Publication |
New Phytologist |
Abbreviated Journal |
New Phytol. |
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Volume |
183 |
Issue |
4 |
Pages |
1124-1133 |
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Keywords |
Aechmea mertensii; antgardens; Camponotus femoratus; foliar structure; delta N-15; Pachycondyla goeldii; phytotelmata contents |
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Aechmea mertensii is a tank-bromeliad that roots on ant-gardens initiated by the ants Camponotus femoratus and Pachycondyla goeldii. Its leaves form compartments acting as phytotelmata that hold rainwater and provide habitats for invertebrates. In this article, we aimed to determine whether the association with either C. femoratus or P. goeldii influenced the vegetative traits of A. mertensii, invertebrate diversity and nutrient assimilation by the leaves. Transmitted light, vegetative traits and phytotelmata contents were compared between the two A. mertensii ant-gardens. Camponotus femoratus colonized partially shaded areas, whereas P. goeldii colonized exposed areas. The bromeliads' rosettes had a large canopy (C. femoratus ant-gardens), or were smaller and amphora shaped (P. goeldii ant-gardens). There were significant differences in leaf anatomy, as shaded leaves were thicker than exposed leaves. The mean volumes of water, fine particulate organic matter and detritus in C. femoratus-associated bromeliads were three to five times higher than in P. goeldii-associated bromeliads. Moreover, the highest invertebrate diversity and leaf delta N-15 values were found in C. femoratus-associated bromeliads. This study enhances our understanding of the dynamics of biodiversity, and shows how ant-plant interactions can have trophic consequences and thus influence the architecture of the interacting plant via a complex feedback loop. |
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[Leroy, Celine; Dejean, Alain] EcoFoG, CNRS, UMR 8172, F-97379 Kourou, France, Email: Celine.Leroy@ecofog.gf |
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WILEY-BLACKWELL PUBLISHING, INC |
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0028-646X |
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ISI:000268855300020 |
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EcoFoG @ eric.marcon @ |
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106 |
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Leroy, C.; Petitclerc, F.; Orivel, J.; Corbara, B.; Carrias, J.-F.; Dejean, A.; Céréghino, R. |
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Title |
The influence of light, substrate and seed origin on the germination and establishment of an ant-garden bromeliad |
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Journal Article |
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Year |
2017 |
Publication |
Plant Biology |
Abbreviated Journal |
Plant Biol J |
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19 |
Issue |
1 |
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70-78 |
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Aechmea mertensii; bromeliad; French Guiana; germination; plant performance; survival |
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Plant germination and development depend upon a seed's successful dispersal into a suitable habitat and its ability to grow and survive within the surrounding biotic and abiotic environment. The seeds of Aechmea mertensii, a tank-bromeliad species, are dispersed by either Camponotus femoratus or Neoponera goeldii, two ant species that initiate ant gardens (AGs). These two mutualistic ant species influence the vegetative and reproductive traits of the bromeliad through their divergent ecological preferences (i.e. light and substrate). We hypothesised that the seeds dispersed by these two ant species have underlying genetic differences affecting germination, growth and survival of A. mertensii seedlings in different ways. To test this, we used an experimental approach consisting of sowing seeds of A. mertensii: (i) taken from the two AG–ant associations (i.e. seed origin), (ii) in two contrasting light conditions, and (iii) on three different substrates. Light and substrate had significant effects on germination, survival and on eight key leaf traits reflecting plant performance. Seed origin had a significant effect only on germination and on two leaf traits (total dry mass and relative growth rate). Overall, this bromeliad performs better (i.e. high growth and survival rates) when growing both in the shade and in the carton nest developed by C. femoratus ants. These results suggest that the plasticity of the tank bromeliad A. mertensii is mainly due to environment but also to genetic differences related to seed origin, as some traits are heritable. Thus, these two ant species may play contrasting roles in shaping plant evolution and speciation. |
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1438-8677 |
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EcoFoG @ webmaster @ |
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712 |
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Petit, M.; Céréghino, R.; Carrias, J.-F.; Corbara, B.; Dezerald, O.; Petitclerc, F.; Dejean, A.; Leroy, C. |
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Are ontogenetic shifts in foliar structure and resource acquisition spatially conditioned in tank-bromeliads? |
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Journal Article |
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2014 |
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Botanical Journal of the Linnean Society |
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Bot J Linn Soc |
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175 |
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2 |
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299-312 |
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Aechmea mertensii; Camponotus femoratus; French Guiana; leaf traits; mutualistic ants; natural stable isotopes; ontogeny; Pachycondyla goeldii; phenotypic plasticity; plant morphology |
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The phenotypic plasticity of plants has been explored as a function of either ontogeny (apparent plasticity) or environment (adaptive plasticity), although few studies have analyzed these factors together. In the present study, we take advantage of the dispersal of Aechmea mertensii bromeliads by Camponotus femoratus or Pachycondyla goeldii ants in shaded and sunny environments, respectively, to quantify ontogenetic changes in morphological, foliar, and functional traits, and to analyze ontogenetic and ant species effects on 14 traits. Most of the morphological (plant height, number of leaves), foliar (leaf thickness, leaf mass area, total water content, trichome density), and functional (leaf δ13C) traits differed as a function of ontogeny. Conversely, only leaf δ15N showed an adaptive phenotypic plasticity. On the other hand, plant width, tank width, longest leaf length, stomatal density, and leaf C concentration showed an adaptation to local environment with ontogeny. The exception was leaf N concentration, which showed no trend at all. Aechmea mertensii did not show an abrupt morphological modification such as in heteroblastic bromeliads, although it was characterized by strong, size-related functional modifications for CO2 acquisition. The adaptive phenotypic variation found between the two ant species indicates the spatially conditioned plasticity of A. mertensii in the context of insect-assisted dispersal. However, ant-mediated effects on phenotypic plasticity in A. mertensii are not obvious because ant species and light environment are confounding variables. © 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 175, 299–312. |
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1095-8339 |
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EcoFoG @ webmaster @ |
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564 |
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Talaga, S.; Dezerald, O.; Carteron, A.; Petitclerc, F.; Leroy, C.; Céréghino, R.; Dejean, A. |
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Tank bromeliads as natural microcosms: A facultative association with ants influences the aquatic invertebrate community structure |
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Journal Article |
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2015 |
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Comptes Rendus – Biologies |
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Comptes Rendus – Biologies |
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338 |
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10 |
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696-700 |
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Aechmea; Ant-bromeliad associations; Aquatic communities; Odontomachus; Phytotelm |
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Many tank bromeliads have facultative relationships with ants as is the case in French Guiana between Aechmea aquilega (Salib.) Griseb. and the trap-jaw ant, Odontomachus haematodus Linnaeus. Using a redundancy analysis, we determined that the presence of O. haematodus colonies is accompanied by a greater quantity of fine particulate organic matter in the water likely due to their wastes. This increase in nutrient availability is significantly correlated with an increase in the abundance of some detritivorous taxa, suggesting a positive bottom-up influence on the aquatic macroinvertebrate communities living in the A. aquilega wells. On the other hand, the abundance of top predators is negatively affected by a lower number of available wells due to ant constructions for nesting, releasing a top-down pressure that could also favor lower trophic levels. © 2015 Académie des sciences. |
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CNRS, Ecolab (UMR-CNRS 5245), 118, route de Narbonne, Toulouse, France |
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Export Date: 2 October 2015 |
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EcoFoG @ webmaster @ |
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627 |
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Leroy, C.; Maes, A.Q.; Louisanna, E.; Séjalon-Delmas, N. |
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How significant are endophytic fungi in bromeliad seeds and seedlings? Effects on germination, survival and performance of two epiphytic plant species |
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Journal Article |
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2019 |
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Fungal Ecology |
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Fungal Ecol. |
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39 |
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296-306 |
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Aechmea; Bromeliads; Endophytic fungi; Fusarium spp.; Germination; Survival; Trichoderma spp.; Vertical transmission |
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In bromeliads, nothing is known about the associations fungi form with seeds and seedling roots. We investigated whether fungal associations occur in the seeds and seedling roots of two epiphytic Aechmea species, and we explored whether substrate and fungal associations contribute to seed germination, and seedling survival and performance after the first month of growth. We found a total of 21 genera and 77 species of endophytic fungi in the seeds and seedlings for both Aechmea species by Illumina MiSeq sequencing. The fungal associations in seeds were found in the majority of corresponding seedlings, suggesting that fungi are transmitted vertically. Substrate quality modulated the germination and growth of seedlings, and beneficial endophytic fungi were not particularly crucial for germination but contributed positively to survival and growth. Overall, this study provides the first evidence of an endophytic fungal community in both the seeds and seedlings of two epiphytic bromeliads species that subsequently benefit plant growth. © 2019 Elsevier Ltd and British Mycological Society |
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INRA, UMR Ecologie des Forêts de Guyane (AgroParisTech, CIRAD, CNRS, INRA, Université de Guyane, Université des Antilles), Campus Agronomique, BP 316, Kourou cedex, F-97379, France |
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Elsevier Ltd |
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17545048 (Issn) |
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EcoFoG @ webmaster @ |
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867 |
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Talaga, S.; Dezerald, O.; Carteron, A.; Leroy, C.; Carrias, J.-F.; Céréghino, R.; Dejean, A. |
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Urbanization impacts the taxonomic and functional structure of aquatic macroinvertebrate communities in a small Neotropical city |
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Journal Article |
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2017 |
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Urban Ecosystems |
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Urban Ecosystems |
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20 |
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5 |
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1001-1009 |
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Aedes aegypti; Bioindicator; Diversity; Functional traits; Tank bromeliads; Urban ecology |
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Due to habitat fragmentation, resource disruption and pollution, urbanization is one of the most destructive forms of anthropization affecting ecosystems worldwide. Generally, human-mediated perturbations dramatically alter species diversity in urban sites compared to the surroundings, thus influencing the functioning of the entire ecosystem. We investigated the taxonomic and functional diversity patterns of the aquatic macroinvertebrate communities in tank bromeliads by comparing those found in a small Neotropical city with those from an adjacent rural site. Changes in the quality of detrital inputs in relation to lower tree diversity and the presence of synanthropic species are likely important driving forces behind the observed structural changes in the urban site. Leaf-litter processors (i.e., shredders, scrapers) were positively affected in the urban site, while filter-feeders that process smaller particles produced by the activity of the shredders were negatively affected. Because we cannot ascertain whether the decline in filter-feeders is related to food web-mediated effects or to competitive exclusion (Aedes aegypti mosquitoes were present in urban bromeliads only), further studies are necessary to account for the effects of intra-guild competition or inter-guild facilitation. © 2017, Springer Science+Business Media New York. |
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Ecolab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France |
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Cited By :1; Export Date: 18 December 2017 |
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EcoFoG @ webmaster @ |
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776 |
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Nirma, C.; Rodrigues, A.M.S.; Basset, C.; Chevolot, L.; Girod, R.; Moretti, C.; Stien, D.; Dusfour, I.; Eparvier, V. |
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Larvicidal activity of isoflavonoids from Muellera frutescens extracts against Aedes aegypti |
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2012 |
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Natural Product Communications |
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7 |
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10 |
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1319-1322 |
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Aedes aegypti; French Guiana; Insecticides; Isoflavonoids; Muellera frutescens |
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The biological activity of extracts from the leaves, bark and roots of Muellera frutescens, an Amazonian ichtyotoxic plant, were evaluated to find new environmentally safe insecticides. The n-hexane extracts of bark, leaf, and root showed a strong toxic activity against Aedes aegypti mosquito larvae. Bioguided fractionation of the bark extract led to the isolation of seven isoflavonoids (12a-hydroxyelliptone, elliptone, (-)-variabilin, rotenone, rotenolone, tephrosin and deguelin). Rotenone and deguelin are responsible for the larvicidal activity of the plant. M. frutescens leaves contain up to 0.6%, w/w, deguelin. These results justify the traditional ichtyotoxic use of M. frutescens. The leaves contain a relatively high proportion of deguelin and, therefore, can be considered as a renewable source of this environmentally friendly insecticidal isoflavonoid. |
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CNRS, Institut de Chimie des Substances Naturelles, UPR 2301, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France |
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Export Date: 6 December 2012; Source: Scopus |
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EcoFoG @ webmaster @ |
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448 |
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