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Schmidt, M.; Dejean, A. |
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Title |
A dolichoderine ant that constructs traps to ambush prey collectively: convergent evolution with a myrmicine genus |
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Journal Article |
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Year |
2018 |
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Biological Journal of the Linnean Society |
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124 |
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1 |
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41-46 |
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Azteca brevis Forel, a dolichoderine ant species, builds along the branches of its host plant galleries that bear numerous holes slightly wider than a worker’s head. We noted that the workers hide, mandibles open, beneath different holes, waiting for arthropod prey to walk by or alight. They seize the extremities of these arthropods and pull backwards, immobilizing the prey, which is then spreadeagled and later carved up or pulled into a gallery before being carved up. The total duration of the capture ranges from a few minutes to several hours. This ambush group hunting permits the capture of insects of a wide range of sizes, with the largest being 48.71 times heavier than the workers, something that we compared with other cases of group hunting by ants and trap use by other arthropods. A convergence with myrmicine ants of the genus Allomerus is shown. Thus, this study also shows that the genus Azteca presents the largest panel of group hunting strategies by ants and that there is polyethism related to polymorphism, as hunting workers are larger than their nestmates. We concluded that these gallery-shaped traps correspond to the notion of ‘extended phenotype’. |
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0024-4066 |
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10.1093/biolinnean/bly028 |
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EcoFoG @ webmaster @ |
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822 |
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Dejean, A.; Orivel, J.; Leponce, M.; Compin, A.; Delabie, J.H.C.; Azémar, F.; Corbara, B. |
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Title |
Ant–plant relationships in the canopy of an Amazonian rainforest: the presence of an ant mosaic |
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Journal Article |
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Year |
2018 |
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Biological Journal of the Linnean Society |
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125 |
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2 |
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344-354 |
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Using different techniques to access the canopy of an Amazonian rainforest, we inspected 157 tree crowns for arboreal ants. Diversity statistics showed that our study sample was not representative of the tree and ant populations due to their high diversity in Amazonian rainforests, but permitted us to note that a representative part of territorially dominant arboreal ant species (TDAAs) was inventoried. Mapping of TDAA territories and use of a null model showed the presence of an ant mosaic in the upper canopy, but this was not the case in the sub-canopy. Among the TDAAs, carton-nesting Azteca dominated (52.98% of the trees) whereas ant-garden ants (Camponotus femoratus and Crematogaster levior), common in pioneer formations, were secondarily abundant (21.64% of the trees), and the remaining 25.37% of trees sheltered one of 11 other TDAAs. The distribution of the trees forming the upper canopy influences the structure of the ant mosaic, which is related to the attractiveness of some tree taxa for certain arboreal ant species and represents a case of diffuse coevolution. |
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0024-4066 |
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10.1093/biolinnean/bly125 |
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EcoFoG @ webmaster @ |
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824 |
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Dejean, Alain ; Petitclerc, Frédéric ; Azémar, Frédéric ; Rossi, Vivien |
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Title |
Nutrient provisioning of its host myrmecophytic tree by a temporary social parasite of a plant-ant |
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Journal Article |
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Year |
2021 |
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Biological Journal of the Linnean Society |
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133 |
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3 |
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744-750 |
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One of the most advanced ant–plant mutualisms is represented by myrmecophytes sheltering colonies of some plant-ant species in hollow structures called domatia. In turn, the myrmecophytes benefit from biotic protection and sometimes nutrient provisioning (myrmecotrophy). Furthermore, over the course of evolution, some ant species have become social parasites of others. In this general context, we studied the relationship between its host trees and Azteca andreae (Dolichoderinae), a temporary social parasite of the plant-ant Azteca ovaticeps, and, as such, obligatorily associated with myrmecophytic Cecropia obtusa trees (Urticaceae). A first experiment showed that the δ15N values of the young leaves of Cecropia sheltering a mature A. andreae colony were very similar to those for trees sheltering Azteca alfari or A. ovaticeps, two typical Cecropia mutualists for which myrmecotrophy is known. In a second experiment, by injecting a 15N-labelled glycine solution into locusts given as prey to A. andreae colonies, we triggered an increase in δ15N in the young leaves of their host Cecropia. Thus, 15N passed from the prey to the host trees, explaining the outcomes of the first experiment. We discuss these results in light of the notion of ‘by-product benefits’. |
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Oxford Academy |
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EcoFoG @ webmaster @ |
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1009 |
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Roggy, J.C.; Moiroud, A.; Lensi, R.; Domenach, A.M. |
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Estimating N transfers between N-2-fixing actinorhizal species and the non-N-2-fixing Prunus avium under partially controlled conditions |
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Journal Article |
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Year |
2004 |
Publication |
Biology and Fertility of Soils |
Abbreviated Journal |
Biol. Fertil. Soils |
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39 |
Issue |
5 |
Pages |
312-319 |
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actinorhizal trees; mixed culture; litter; N transfer by roots; N-15 |
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Two methods of N transfer between plants-by litter decomposition and root-to-root exchange-were examined in mixed plantations of N-fixing and non-fixing trees. Nitrogen transfers from decaying litters were measured by placing N-15-labelled litters from four actinorhizal tree species around shoots of containerized Prunus avium. Nitrogen transfers by root-to-root exchanges were measured after foliar NO3-N-15 fertilization of Alnus subcordata and Elaeagnus angustifolia growing in containers in association with P. avium. During the first 2 years of litter decomposition, from 5-20% of the N, depending on the litter identity, was released and taken up by P. avium. N availability in the different litters was strongly correlated with the amount of water-soluble N, which was highest in leaves of E. angustifolia. In the association between fixing and non-fixing plants, 7.5% of the A. subcordata N and 25% of E. angustifolia N was transferred to P. avium by root exchange. These results showed that the magnitude of N transfers by root exchange depended on the associated N-2-fixing species. Among the species investigated, E. angustifolia displayed the highest capacity for exudating N from roots as well as for releasing N from litters. These qualities make this tree a promising species for enhancing wood yields in mixed stands. |
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INRA, ENGREF, CIRAD, Unite Mixte Rech,Lab Ecol Forets Trop Guyane, Kourou 97387, French Guiana, Email: roggy.j@cirad.fr |
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SPRINGER-VERLAG |
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0178-2762 |
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ISI:000221197000002 |
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EcoFoG @ eric.marcon @ |
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236 |
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Petillon, J.; Montaigne, W.; Renault, D. |
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Title |
Hypoxic coma as a strategy to survive inundation in a salt-marsh inhabiting spider |
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Journal Article |
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Year |
2009 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
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5 |
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4 |
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442-445 |
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1744-9561 |
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WOS:000267881700002 |
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EcoFoG @ webmaster @ |
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288 |
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Ruiz-Gonzalez, M.X.; Male, P.J.G.; Leroy, C.; Dejean, A.; Gryta, H.; Jargeat, P.; Quilichini, A.; Orivel, J. |
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Specific, non-nutritional association between an ascomycete fungus and Allomerus plant-ants |
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Journal Article |
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Year |
2011 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
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7 |
Issue |
3 |
Pages |
475-479 |
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ant-fungus association; Cordia nodosa; Chaetothyriales; Hirtella physophora; myrmecophyte; population structure |
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Ant-fungus associations are well known from attine ants, whose nutrition is based on a symbiosis with basidiomycete fungi. Otherwise, only a few non-nutritional ant-fungus associations have been recorded to date. Here we focus on one of these associations involving Allomerus plant-ants that build galleried structures on their myrmecophytic hosts in order to ambush prey. We show that this association is not opportunistic because the ants select from a monophyletic group of closely related fungal haplotypes of an ascomycete species from the order Chaetothyriales that consistently grows on and has been isolated from the galleries. Both the ants' behaviour and an analysis of the genetic population structure of the ants and the fungus argue for host specificity in this interaction. The ants' behaviour reveals a major investment in manipulating, growing and cleaning the fungus. A molecular analysis of the fungus demonstrates the widespread occurrence of one haplotype and many other haplotypes with a lower occurrence, as well as significant variation in the presence of these fungal haplotypes between areas and ant species. Altogether, these results suggest that such an interaction might represent an as-yet undescribed type of specific association between ants and fungus in which the ants cultivate fungal mycelia to strengthen their hunting galleries. |
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[Leroy, Celine; Dejean, Alain; Quilichini, Angelique; Orivel, Jerome] CNRS, UMR Ecol Forets Guyane 8172, F-97379 Kourou, France, Email: jerome.orivel@ecofog.gf |
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Royal Soc |
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1744-9561 |
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ISI:000290515100044 |
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no |
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EcoFoG @ webmaster @ |
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317 |
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Author |
Morel-Journel, T.; Piponiot, C.; Vercken, E.; Mailleret, L. |
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Title |
Evidence for an optimal level of connectivity for establishment and colonization |
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Journal Article |
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Year |
2016 |
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Biology Letters |
Abbreviated Journal |
Biol Lett |
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12 |
Issue |
11 |
Pages |
20160704 |
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Dispersal is usually associated with the spread of invasive species, but it also has two opposing effects, one decreasing and the other increasing the probability of establishment. Indeed, dispersal both slows population growth at the site of introduction and increases the likelihood of surrounding habitat being colonized. The connectivity of the introduction site is likely to affect dispersal, and, thus, establishment, according to the dispersal behaviour of individuals. Using individual-based models and microcosm experiments on minute wasps, we demonstrated the existence of a hump-shaped relationship between connectivity and establishment in situations in which individual dispersal resembled a diffusion process. These results suggest that there is an optimal level of connectivity for the establishment of introduced populations locally at the site of introduction, and regionally over the whole landscape. |
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EcoFoG @ webmaster @ |
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722 |
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Clair, B.; Almeras, T.; Yamamoto, H.; Okuyama, T.; Sugiyama, J. |
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Title |
Mechanical behavior of cellulose microfibrils in tension wood, in relation with maturation stress generation |
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Journal Article |
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Year |
2006 |
Publication |
Biophysical Journal |
Abbreviated Journal |
Biophys. J. |
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Volume |
91 |
Issue |
3 |
Pages |
1128-1135 |
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A change in cellulose lattice spacing can be detected during the release of wood maturation stress by synchrotron x-ray diffraction experiment. The lattice strain was found to be the same order of magnitude as the macroscopic strain. The fiber repeat distance, 1.033 nm evaluated for tension wood after the release of maturation stress was equal to the conventional wood values, whereas the value before stress release was larger, corresponding to a fiber repeat of 1.035 nm, nearly equal to that of cotton and ramie. Interestingly, the fiber repeat varied from 1.033 nm for wood to 1.040 nm for algal cellulose, with an increasing order of lateral size of cellulose microfibrils so far reported. These lines of experiments demonstrate that, before the stress release, the cellulose was in a state of tension, which is, to our knowledge, the first experimental evidence supporting the assumption that tension is induced in cellulose microfibrils. |
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Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Kyoto, Japan, Email: sugiyama@rish.kyoto-u.ac.jp |
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BIOPHYSICAL SOCIETY |
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0006-3495 |
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ISI:000239086800039 |
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EcoFoG @ eric.marcon @ |
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224 |
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Author |
Salvin, P.; Roos, C.; Robert, F. |
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Title |
Tropical mangrove sediments as a natural inoculum for efficient electroactive biofilms |
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Journal Article |
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Year |
2012 |
Publication |
Bioresource Technology |
Abbreviated Journal |
Bioresour. Technol. |
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120 |
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45-51 |
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Chronoamperometry; Cyclic voltammetry; Electroactive biofilms; Microbial fuel cells; Three-electrode systems |
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Chronoamperometry is known to be an efficient way to form electroactive biofilms (EAB) on conductive electrodes. For the first time, tropical mangrove sediments are analyzed as a potential inoculum to form MFC anodes with the use of acetate as substrate. The performance of the EAB-coated carbon cloth electrodes are evaluated according to the maximal current density, the coulombic efficiency and the cyclic voltammogramms. Working electrodes (WE) polarized at -0.2V/SCE gave better results compared to -0.4V/SCE and 0.0V/SCE. The maximal current density attained was 12A/m 2 with a CE of 24%. Contributions of the EAB in the generation of current were discussed and mechanisms of electronic transfer by the bacteria were discussed. Epifluorescence and SEM images showed the evolution of the biofilms on the electrode surface and the heterogeneity of the structure. © 2012 Elsevier Ltd. |
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Laboratoire des Matériaux et des Molécules en Milieu Amazonien, Université des Antilles et de la Guyane, UAG-UMR ECOFOG, F-97337 Cayenne, French Guiana |
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09608524 (Issn) |
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Export Date: 16 August 2012; Source: Scopus; Coden: Birte; doi: 10.1016/j.biortech.2012.05.131; Language of Original Document: English; Correspondence Address: Robert, F.; Laboratoire des Matériaux et des Molécules en Milieu Amazonien, Université des Antilles et de la Guyane, UAG-UMR ECOFOG, F-97337 Cayenne, French Guiana; email: florent.robert@guyane.univ-ag.fr |
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EcoFoG @ webmaster @ |
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421 |
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Ruelle, J.; Yamamoto, H.; Thibaut, B. |
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Growth Stresses and Cellulose Structural Parameters in Tension and Normal Wood from Three Tropical Rainforest Angiosperm Species |
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Journal Article |
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2007 |
Publication |
BioResources |
Abbreviated Journal |
BioResources |
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2 |
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2 |
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235-251 |
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Cellulose; Microfibril angle; Crystallite size; Tension wood; Tropical rainforest; Growth stresses |
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Few studies have been conducted about relation between cellulose parameters and biomechanical properties of wood in tropical angiosperms species. For this purpose, on 13 trees from 3 species of French Guyana tropical rainforest in a clear active process of restoring verticality, i) growth strains were measured in situ in order to determine the occurrence of tension wood within samples and ii) cellulose structural parameters were estimated on all the samples using X-ray diffraction method. Crystallite size was estimated from the full-width at half-maximum of the Miller index (002) arc diffraction and angle T was measured following Cave's method. Relationships between these parameters and growth stresses were good and the variations between normal and tension wood were significant, i. e. a lower angle T and a larger crystallite size in tension wood. In order to have a good estimation of the microfibril angle in the main layer of the secondary wall for each species, an experimental calibration was done between angle T and microfibril angle observed with scanning electron microscopy. |
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[Ruelle, Julien; Thibaut, Bernard] UMR EcoFoG, Kourou 97387, Guyana, Email: ruelle_j@kourou.cirad.fr |
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NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI |
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1930-2126 |
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ISI:000263689300009 |
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EcoFoG @ eric.marcon @ |
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122 |
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