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Author Dejean, A.; Groc, S.; Herault, B.; Rodriguez-Pérez, H.; Touchard, A.; Céréghino, R.; Delabie, J.H.C.; Corbara, B. url  openurl
  Title Bat aggregation mediates the functional structure of ant assemblages Type Journal Article
  Year 2015 Publication Comptes Rendus – Biologies Abbreviated Journal Comptes Rendus – Biologies  
  Volume 338 Issue 10 Pages (up) 688-695  
  Keywords Ant functional groups; Bat roosts; Biogeochemical hotspots; Bioindicators; Stable isotopes  
  Abstract In the Guianese rainforest, we examined the impact of the presence of guano in and around a bat roosting site (a cave). We used ant communities as an indicator to evaluate this impact because they occupy a central place in the functioning of tropical rainforest ecosystems and they play different roles in the food web as they can be herbivores, generalists, scavengers or predators. The ant species richness around the cave did not differ from a control sample situated 500m away. Yet, the comparison of functional groups resulted in significantly greater numbers of detritivorous fungus-growing and predatory ant colonies around the cave compared to the control, the contrary being true for nectar and honeydew feeders. The role of bats, through their guano, was shown using stable isotope analyses as we noted significantly greater δ15N values for the ant species captured in and around the cave compared to controls. © 2015 Académie des sciences.  
  Address Laboratoire Microorganismes, Génome et Environnement, Université Clermont-Auvergne, Université Blaise-Pascal, BP 10448, Clermont-Ferrand, France  
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  Notes Export Date: 2 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 625  
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Author Gibernau, M.; Orivel, J.; Dejean, A.; Delabie, J.; Barabe, D. openurl 
  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 (up) 689-692  
  Keywords Araceae; domatia; habitat; nest site; non-specific association; Philodendron solimoesense; territoriality  
  Abstract  
  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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  Publisher CAMBRIDGE UNIV PRESS Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0266-4674 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000261254400012 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 128  
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Author Lehours, A.-C.; Jeune, A.-H.L.; Aguer, J.-P.; Céréghino, R.; Corbara, B.; Kéraval, B.; Leroy, C.; Perrière, F.; Jeanthon, C.; Carrias, J.-F. doi  openurl
  Title Unexpectedly high bacteriochlorophyll a concentrations in neotropical tank bromeliads Type Journal Article
  Year 2016 Publication Environmental Microbiology Reports Abbreviated Journal Environmental Microbiology Reports  
  Volume 8 Issue 5 Pages (up) 689-698  
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  Abstract The contribution of bacteriochlorophyll a (BChl a) to photosynthetically driven electron transport is generally low in aquatic and terrestrial systems. Here, we provide evidence that anoxygenic bacterial phototrophy is widespread and substantial in water retained by tank bromeliads of a primary rainforest in French Guiana. An analysis of the water extracted from 104 randomly selected tank bromeliads using infrared fluorimetry suggested the overall presence of abundant anoxygenic phototrophic bacterial populations. We found that purple bacteria dominated these populations responsible for unusually high BChl a/chlorophyll a ratios (>50%). Our data suggest that BChl a-based phototrophy in tank bromeliads can have significant effects on the ecology of tank-bromeliad ecosystems and on the carbon and energy fluxes in Neotropical forests.  
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  ISSN 1758-2229 ISBN Medium  
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  Call Number EcoFoG @ webmaster @ Serial 709  
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Author Alméras, T.; Ghislain, B.; Clair, B.; Secerovic, A.; Pilate, G.; Fournier, M. url  doi
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  Title Quantifying the motor power of trees Type Journal Article
  Year 2018 Publication Trees Abbreviated Journal  
  Volume 32 Issue 3 Pages (up) 689-702  
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  Abstract Wood maturation strains can be estimated from the change in curvature that occurs when a stem grown staked in tilted position is released from the stake.
Trees have a motor system to enable upright growth in the field of gravity. This motor function is taken on by reaction wood, a special kind of wood that typically develops in leaning axes and generates mechanical force during its formation, curving up the stem and counteracting the effect of gravity or other mechanical disturbances. Quantifying the mechanical stress induced in wood during maturation is essential to many areas of research ranging from tree architecture to functional genomics. Here, we present a new method for quantifying wood maturation stress. It consists of tilting a tree, tying it to a stake, letting it grow in tilted position, and recording the change in stem curvature that occurs when the stem is released from the stake. A mechanical model is developed to make explicit the link between the change in curvature, maturation strain and morphological traits of the stem section. A parametric study is conducted to analyse how different parameters influence the change in curvature. This method is applied to the estimation of maturation strain in two different datasets. Results show that the method is able to detect genotypic variations in motor power expression. As predicted by the model, we observe that the change in stem curvature is correlated to stem diameter and diameter growth. In contrast, wood maturation strain is independent from these dimensional effects, and is suitable as an intrinsic parameter characterising the magnitude of the plant’s gravitropic reaction.
 
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  ISSN 1432-2285 ISBN Medium  
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  Call Number EcoFoG @ webmaster @ Alméras2018 Serial 835  
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Author Baraloto, C.; Hardy, O.J.; Paine, C.E.T.; Dexter, K.G.; Cruaud, C.; Dunning, L.T.; Gonzalez, M.-A.; Molino, J.-F.; Sabatier, D.; Savolainen, V.; Chave, J. url  openurl
  Title Using functional traits and phylogenetic trees to examine the assembly of tropical tree communities Type Journal Article
  Year 2012 Publication Journal of Ecology Abbreviated Journal J. Ecol.  
  Volume 100 Issue 3 Pages (up) 690-701  
  Keywords Competition; Determinants of plant community diversity and structure; Environmental filtering; French Guiana; Functional traits; Limiting similarity; Niche; Phylogenetic signal; Tropical forests  
  Abstract Niche theory proposes that species differences underlie both coexistence within communities and the differentiation in species composition among communities via limiting similarity and environmental filtering. However, it has been difficult to extend niche theory to species-rich communities because of the empirical challenge of quantifying niches for many species. This has motivated the development of functional and phylogeny-based approaches in community ecology, which represent two different means of approximating niche attributes. Here, we assess the utility of plant functional traits and phylogenetic relationships in predicting community assembly processes using the largest trait and phylogenetic data base to date for any set of species-rich communities. We measured 17 functional traits for all 4672 individuals of 668 tree species co-occurring in nine tropical rain forest plots in French Guiana. Trait variation was summarized into two ordination axes that reflect species niche overlap. We also generated a dated molecular phylogenetic tree based on DNA sequencing of two plastid loci (rbcL and matK) comprising 97% of the individuals and 91% of the species in the plots. We found that, on average, co-occurring species had greater functional and, to a lesser extent, phylogenetic similarity than expected by chance. We also found that functional traits and their ordination loadings showed significant, albeit weak, phylogenetic signal, suggesting that phylogenetic distance provides pertinent information on niche overlap in tropical tree communities. Synthesis. We provide the most comprehensive examination to date of the relative importance of environmental filtering and limiting similarity in structuring tropical tree communities. Our results confirm that environmental filtering is the overriding influence on community assembly in these species-rich systems. © 2012 The Authors. Journal of Ecology © 2012 British Ecological Society.  
  Address Royal Botanic Gardens, Kew, Richmond TW9 3DS, United Kingdom  
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  ISSN 00220477 (Issn) ISBN Medium  
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  Notes Export Date: 24 April 2012; Source: Scopus; Coden: Jecoa; doi: 10.1111/j.1365-2745.2012.01966.x; Language of Original Document: English; Correspondence Address: Chave, J.; Université Paul Sabatier, CNRS, UMR 5174 Laboratoire Evolution et Diversité Biologique, 31062 Toulouse, France; email: chave@cict.fr Approved no  
  Call Number EcoFoG @ webmaster @ Serial 393  
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Author Céréghino, R.; Corbara, B.; Hénaut, Y.; Bonhomme, C.; Compin, A.; Dejean, A. url  doi
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  Title Ant and spider species as surrogates for functional community composition of epiphyte-associated invertebrates in a tropical moist forest Type Journal Article
  Year 2019 Publication Ecological Indicators Abbreviated Journal  
  Volume 96 Issue Pages (up) 694-700  
  Keywords Functional traits; Indicator species; Phytotelmata; Rainforests; Surrogacy; Tank bromeliads  
  Abstract Epiphytes represent up to 50% of all plant species in rainforests, where they host a substantial amount of invertebrate biomass. Efficient surrogates for epiphyte invertebrate communities could reduce the cost of biomonitoring surveys while preventing destructive sampling of the plants. Here, we focus on the invertebrate communities associated to tank bromeliads. We ask whether the presence of particular ant and/or spider taxa (easily surveyed taxa) that use these plants as nesting and/or foraging habitats predicts functional trait combinations of aquatic invertebrate communities hosted by the plants. Functional community composition of invertebrates was predicted both by bromeliad habitat features and the presence of certain ant and spider species. The ant Azteca serica preferred wider bromeliad rosettes that trap large amount of detritus, indicating interstitial-like food webs dominated by deposit feeders that burrow in fine particulate organic matter. Leucauge sp. spiders preferred narrower bromeliad rosettes bearing smaller detrital loads, thereby indicating a dominance of pelagic filter-feeding and predatory invertebrates in the water-filled leaf axils. Both Neoponera villosa ants and Eriophora sp. spiders preferred rosettes at intermediate size bearing moderate amounts of detritus, indicating a benthic food web dominated by leaf shredders and gathering collectors. Owing to the animal diversity and biomass supported by rainforest epiphytes, our approach would deserve to be further tested on a range of epiphytes involved in tight interactions with invertebrates. In this context, surrogate species could serve both as indicators of functional diversity, and as early-warning indicators of network disassembly.  
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  ISSN 1470-160x ISBN Medium  
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  Call Number EcoFoG @ webmaster @ Serial 841  
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Author Talaga, S.; Dezerald, O.; Carteron, A.; Petitclerc, F.; Leroy, C.; Céréghino, R.; Dejean, A. url  openurl
  Title Tank bromeliads as natural microcosms: A facultative association with ants influences the aquatic invertebrate community structure Type Journal Article
  Year 2015 Publication Comptes Rendus – Biologies Abbreviated Journal Comptes Rendus – Biologies  
  Volume 338 Issue 10 Pages (up) 696-700  
  Keywords Aechmea; Ant-bromeliad associations; Aquatic communities; Odontomachus; Phytotelm  
  Abstract 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.  
  Address CNRS, Ecolab (UMR-CNRS 5245), 118, route de Narbonne, Toulouse, France  
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  Notes Export Date: 2 October 2015 Approved no  
  Call Number EcoFoG @ webmaster @ Serial 627  
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Author Carrias, J.-F.; Brouard, O.; Leroy, C.; Céréghino, R.; Pélozuelo, L.; Dejean, A.; Corbara, B. url  openurl
  Title An ant-plant mutualism induces shifts in the protist community structure of a tank-bromeliad Type Journal Article
  Year 2012 Publication Basic and Applied Ecology Abbreviated Journal  
  Volume 13 Issue 8 Pages (up) 698-705  
  Keywords Aechmea mertensii; Ant-garden; Biodiversity; Camponotus femoratus; French Guiana; Pachycondyla goeldii; Phytotelmata; Protists  
  Abstract 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.  
  Address Université de Toulouse; UPS, 118 route de Narbonne, 31062 Toulouse, France  
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  Notes Export Date: 14 December 2012; Source: Scopus Approved no  
  Call Number EcoFoG @ webmaster @ Serial 449  
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Author Coste, S.; Roggy, J.C.; Garraud, L.; Heuret, P.; Nicolini, E.; Dreyer, E. openurl 
  Title Does ontogeny modulate irradiance-elicited plasticity of leaf traits in saplings of rain-forest tree species? A test with Dicorynia guianensis and Tachigali melinonii (Fabaceae, Caesalpinioideae) Type Journal Article
  Year 2009 Publication Annals of Forest Science Abbreviated Journal Ann. For. Sci.  
  Volume 66 Issue 7 Pages (up) 701-709  
  Keywords plant architecture; phenotypic plasticity; photosynthetic capacity; leaf structure; tropical rain forest  
  Abstract Irradiance elicits a large plasticity in leaf traits, but little is known about the modulation of this plasticity by ontogeny. Interactive effects of relative irradiance and ontogeny were assessed on leaf traits for two tropical rainforest tree species: Dicorynia guianensis Amshoff and Tachigali melinonii (Harms) Barneby (Fabaceae, Caesalpinioideae). Eleven morphological and physiological leaf traits, relative to photosynthetic performance, were measured on saplings at three different architectural development stages (ASD 1, 2 and 3) and used to derive composite traits like photosynthetic N-use efficiency. Measurements were made along a natural irradiance gradient. The effect of ASD was very visible and differed between the two species. For Dicorynia guianensis, only leaf mass-per-area (LMA) significantly increased with ASDs whereas for Tachigali melinonii, almost all traits were affected by ASD: LMA, leaf N content and photosynthetic capacity increased from ASD 1 to ASD 3. Photosynthetic N-use-efficiency was not affected by ASD in any species. Leaf traits were severely modulated by irradiance, whereas the degree of plasticity was very similar among ASDs. Only few interactions were detected between irradiance and ASD, for leaf thickness, carbon content, and the ratio Chl/N in T. melinonii and for photosynthetic capacity in D. guianensis. We conclude that ontogenic development and irradiance-elicited plasticity modulated leaf traits, with almost no interaction, i.e., the degree of irradiance-elicited plasticity was stable across development stages and independent of ontogeny in these two species, at least in the early stages of development assessed here.  
  Address [Dreyer, Erwin] INRA, UMR Ecol & Ecophysiol Forestieres 1137, F-54280 Champenoux, France, Email: dreyer@nancy.inra.fr  
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  Publisher EDP SCIENCES S A Place of Publication Editor  
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  Series Volume Series Issue Edition  
  ISSN 1286-4560 ISBN Medium  
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  Notes ISI:000270906600009 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 100  
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Author Baraloto, C.; Goldberg, D.E. openurl 
  Title Microhabitat associations and seedling bank dynamics in a neotropical forest Type Journal Article
  Year 2004 Publication Oecologia Abbreviated Journal Oecologia  
  Volume 141 Issue 4 Pages (up) 701-712  
  Keywords French Guiana; life history traits; light availability; regeneration niche; soil nutrients  
  Abstract We conducted a rigorous test of tropical tree seedling microhabitat differentiation by examining microhabitat associations, survival and growth of established seedlings of ten tropical tree species representing a four-factor gradient in seed size. Eight microhabitat variables describing soil and light conditions were measured directly adjacent to each of 588 seedlings within twelve 10 x 100 m belt transects at Paracou, French Guiana, and at 264 reference points along the transects. From these measurements, we defined three principal components describing soil richness, soil softness and canopy openness. Six of ten species ( in 9 of 30 total cases) were distributed non-randomly with respect to microhabitat along at least one principal component. However, few species demonstrated clear microhabitat specialization. All shifts in distribution relative to reference points were in the same direction ( richer, softer soil). Furthermore, of 135 pairwise comparisons among the species, only 7 were significantly different. More than three-fourths of all seedlings (75.3%) survived over the 2-year monitoring period, but survival rates varied widely among species. In no case was the probability of survival influenced by any microhabitat parameter. Relative height growth rates for the seedlings over 2 years varied from – 0.031 cm cm(-1) year(-1) (Dicorynia guianensis, Caesalpiniaceae) to 0.088 cm cm(-1) year(-1) (Virola michelii, Myristicaceae). In only 4 of 30 cases was height growth significantly associated with one of the three principal components. Because the conditions in this study were designed to maximize the chance of finding microhabitat differentiation among a group of species differing greatly in life history traits, the lack of microhabitat specialization it uncovered suggests that microhabitat partitioning among tropical tree species at the established seedling stage is unlikely to contribute greatly to coexistence among these species.  
  Address INRA Kourou, UMR Ecol Forets Guyane, Kourou 97387, French Guiana, Email: baraloto.c@kourou.cirad.fr  
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  Publisher SPRINGER Place of Publication Editor  
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  Series Volume Series Issue Edition  
  ISSN 0029-8549 ISBN Medium  
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  Notes ISI:000224999800015 Approved no  
  Call Number EcoFoG @ eric.marcon @ Serial 233  
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