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Dejean, A.; Grangier, J.; Leroy, C.; Orivel, J. |
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Title |
Predation and aggressiveness in host plant protection: a generalization using ants from the genus Azteca |
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Journal Article |
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Year  |
2009 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
Naturwissenschaften |
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Volume |
96 |
Issue |
1 |
Pages |
57-63 |
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Keywords |
Aggressiveness; Ant-plant relationships; Biotic defence; Predation |
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Abstract |
In studying the ant genus Azteca, a Neotropical group of arboreal species, we aimed to determine the extent to which the ants use predation and/or aggressiveness to protect their host plants from defoliating insects. We compared a territorially dominant, carton-nester, Azteca chartifex, and three plant-ant species. Azteca alfari and Azteca ovaticeps are associated with the myrmecophyte Cecropia (Cecropiaceae) and their colonies shelter in its hollow branches; whereas Azteca bequaerti is associated with Tococa guianensis (Melastomataceae) and its colonies shelter in leaf pouches situated at the base of the laminas. Whereas A. bequaerti workers react to the vibrations transmitted by the lamina when an alien insect lands on a leaf making it unnecessary for them to patrol their plant, the workers of the three other species rather discover prey by contact. The workers of all four species use a predatory behaviour involving spread-eagling alien insects after recruiting nestmates at short range, and, in some cases, at long range. Because A. alfari and A. ovaticeps discard part of the insects they kill, we deduced that the workers' predatory behaviour and territorial aggressiveness combine in the biotic defence of their host tree. |
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[Dejean, Alain; Leroy, Celine] CNRS, UMR Ecol Forets Guyane 8172, F-97379 Kourou, France, Email: alain.dejean@wanadoo.fr |
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0028-1042 |
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ISI:000261791000006 |
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EcoFoG @ eric.marcon @ |
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125 |
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Vedel, V.; Arthur, W. |
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Character changes during the early post-embryonic development of the centipede Strigamia maritima (Leach, 1817) (Chilopoda: Geophilomorpha) |
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Journal Article |
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Year |
2009 |
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International Journal of Myriapodology |
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2 |
Issue |
1 |
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53-61 |
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MOULT DEVELOPMENT ARTHROPOD POST-EMBRYONIC STAGE MORPHOLOGICAL CHANGE MYRIAPOD CENTIPEDE EVO-DEVO |
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For many kinds of ecological, evolutionary and developmental study, it is important to be able to describe the life-history of the individuals of a particular species/population. In the case of myriapods and other arthropods, this involves separating the different life-history stages (or stadia or instars) that are separated by moults. However, it has recently been pointed out that in the earliest post-embryonic stages the cuticle is still quite flexible; this means that visible external developmental changes can occur between moults as well as during them. Here, we provide evidence for such inter-moult changes in the coastal geophilomorph centipede Strigamia maritima. The character states studied enable finer-scale resolution of early post-embryonic forms than was hitherto possible. Specifically, we describe five transitional forms during a period in which just two (Peripatoid and Foetus) have traditionally been recognized |
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Character changes during the early post-embryonic development of the centipede Strigamia maritima (Leach, 1817) (Chilopoda: Geophilomorpha); doi:10.1163/187525409X462412 |
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EcoFoG @ eric.marcon @ 13 |
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187 |
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Pickett, K.M.; Carpenter, J.M.; Dejean, A. |
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Title |
“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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Year |
2009 |
Publication |
Zoosystema |
Abbreviated Journal |
Zoosystema |
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Volume |
31 |
Issue |
4 |
Pages |
945-948 |
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Keywords |
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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1280-9551 |
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ISI:000273733000008 |
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EcoFoG @ eric.marcon @ |
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188 |
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Fouquet, A.; Dubut, V.; Hataway, R.; Scotti-Saintagne, C.; Scotti, I.; Noonan, B. |
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Isolation and characterisation of 19 microsatellite loci from the Amazonian frog Adenomera andreae (Amphibia: Anura: Leptodactylidae) |
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Journal Article |
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Year |
2009 |
Publication |
Conservation Genetics Resources |
Abbreviated Journal |
Conserv. Genet. Res. |
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Volume |
1 |
Issue |
1 |
Pages |
217-220 |
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Biomedicine |
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Nineteen novel microsatellite loci were isolated from Adenomera andreae, a widespread Amazonian frog considered to be a species complex. Three multiplex kits were optimized. Genetic diversity was assessed in 66 individuals sampled in three populations along the West of the Approuague River catchment (French Guiana). We also tested the multiplex kits in four other Adenomera and nine Leptodactylus species with 43.4 and 17.5% success respectively. |
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Springer Netherlands |
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1877-7252 |
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EcoFoG @ eric.marcon @ |
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185 |
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Author |
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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Year |
2009 |
Publication |
Plant Signaling and Behavior |
Abbreviated Journal |
Plant. Signal. Behav. |
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Volume |
4 |
Issue |
9 |
Pages |
868-870 |
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Keywords |
Aechmea mertensii Camponotus femoratus nitrogen nitrogen stable isotope Pachycondyla goeldii plant-insect interactions phytotelmata |
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Abstract |
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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Gonzalez, M.A.; Baraloto, C.; Engel, J.; Mori, S.A.; Petronelli, P.; Riera, B.; Roger, A.; Thebaud, C.; Chave, J. |
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Title |
Identification of Amazonian Trees with DNA Barcodes |
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Journal Article |
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Year |
2009 |
Publication |
PLoS One |
Abbreviated Journal |
PLoS One |
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Volume |
4 |
Issue |
10 |
Pages |
e7483 |
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Background: Large-scale plant diversity inventories are critical to develop informed conservation strategies. However, the workload required for classic taxonomic surveys remains high and is particularly problematic for megadiverse tropical forests. Methodology/Principal Findings: Based on a comprehensive census of all trees in two hectares of a tropical forest in French Guiana, we examined whether plant DNA barcoding could contribute to increasing the quality and the pace of tropical plant biodiversity surveys. Of the eight plant DNA markers we tested (rbcLa, rpoC1, rpoB, matK, ycf5, trnL, psbA-trnH, ITS), matK and ITS had a low rate of sequencing success. More critically, none of the plastid markers achieved a rate of correct plant identification greater than 70%, either alone or combined. The performance of all barcoding markers was noticeably low in few species-rich clades, such as the Laureae, and the Sapotaceae. A field test of the approach enabled us to detect 130 molecular operational taxonomic units in a sample of 252 juvenile trees. Including molecular markers increased the identification rate of juveniles from 72% (morphology alone) to 96% (morphology and molecular) of the individuals assigned to a known tree taxon. Conclusion/Significance: We conclude that while DNA barcoding is an invaluable tool for detecting errors in identifications and for identifying plants at juvenile stages, its limited ability to identify collections will constrain the practical implementation of DNA-based tropical plant biodiversity programs. |
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PUBLIC LIBRARY SCIENCE |
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1932-6203 |
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ISI:000270880700009 |
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no |
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EcoFoG @ eric.marcon @ |
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189 |
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Foucaud, J.; Orivel, J.; Fournier, D.; Delabie, J.H.C.; Loiseau, A.; Le Breton, J.; Cerdan, P.; Estoup, A. |
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Title |
Reproductive system, social organization, human disturbance and ecological dominance in native populations of the little fire ant, Wasmannia auropunctata |
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Journal Article |
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Year |
2009 |
Publication |
Molecular Ecology |
Abbreviated Journal |
Mol. Ecol. |
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Volume |
18 |
Issue |
24 |
Pages |
5059-5073 |
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biological invasion; clonality; human disturbance; parthenogenesis; social organization; Wasmannia auropunctata |
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The invasive ant species Wasmannia auropunctata displays both ecologically dominant and non-dominant populations within its native range. Three factors could theoretically explain the ecological dominance of some native populations of W. auropunctata: (i) its clonal reproductive system, through demographic and/or adaptive advantages; (ii) its unicolonial social organization, through lower intraspecific and efficient interspecific competition; (iii) the human disturbance of its native range, through the modification of biotic and abiotic environmental conditions. We used microsatellite markers and behavioural tests to uncover the reproductive modes and social organization of dominant and non-dominant native populations in natural and human-modified habitats. Microsatellite and mtDNA data indicated that dominant and non-dominant native populations (supercolonies as determined by aggression tests) of W. auropunctata did not belong to different evolutionary units. We found that the reproductive system and the social organization are neither necessary nor sufficient to explain W. auropunctata ecological dominance. Dominance rather seems to be set off by unknown ecological factors altered by human activities, as all dominant populations were recorded in human-modified habitats. The clonal reproductive system found in some populations of W. auropunctata may however indirectly contribute to its ecological dominance by allowing the species to expand its environmental niche, through the fixation over time of specific combinations of divergent male and female genotypes. Unicoloniality may rather promote the range expansion of already dominant populations than actually trigger ecological dominance. The W. auropunctata model illustrates the strong impact of human disturbance on species' ecological features and the adaptive potential of clonal reproductive systems. |
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[Foucaud, Julien; Fournier, Denis; Loiseau, Anne; Estoup, Arnaud] Montpellier SupAgro, Cirad, IRD, INRA,UMR CBGP, F-34988 Montferrier Sur Lez, France, Email: julien.foucaud@legs.cnrs-gif.fr |
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WILEY-BLACKWELL PUBLISHING, INC |
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0962-1083 |
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ISI:000272452700009 |
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no |
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EcoFoG @ eric.marcon @ |
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191 |
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Author |
Szilagyi, A.; Scheuring, I.; Edwards, D.P.; Orivel, J.; Yu, D.W. |
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Title |
The evolution of intermediate castration virulence and ant coexistence in a spatially structured environment |
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Journal Article |
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Year |
2009 |
Publication |
Ecology Letters |
Abbreviated Journal |
Ecol. Lett. |
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12 |
Issue |
12 |
Pages |
1306-1316 |
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Cooperation; evolution of virulence; host-pathogen; mutualism; myrmecophyte; parasite; rock-paper-scissors; spatial games; tolerance; trade-off |
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Theory suggests that spatial structuring should select for intermediate levels of virulence in parasites, but empirical tests are rare and have never been conducted with castration (sterilizing) parasites. To test this theory in a natural landscape, we construct a spatially explicit model of the symbiosis between the ant-plant Cordia nodosa and its two, protecting ant symbionts, Allomerus and Azteca. Allomerus is also a castration parasite, preventing fruiting to increase colony fecundity. Limiting the dispersal of Allomerus and host plant selects for intermediate castration virulence. Increasing the frequency of the mutualist, Azteca, selects for higher castration virulence in Allomerus, because seeds from Azteca-inhabited plants are a public good that Allomerus exploits. These results are consistent with field observations and, to our knowledge, provide the first empirical evidence supporting the hypothesis that spatial structure can reduce castration virulence and the first such evidence in a natural landscape for either mortality or castration virulence. |
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[Edwards, David P.; Yu, Douglas W.] Univ E Anglia, Sch Biol Sci, Norwich NR4 7TJ, Norfolk, England, Email: dougwyu@gmail.com |
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WILEY-BLACKWELL PUBLISHING, INC |
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1461-023X |
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ISI:000271631500006 |
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EcoFoG @ eric.marcon @ |
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192 |
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Cohen, M.C.L.; Behling, H.; Lara, R.J.; Smith, C.B.; Matos, H.R.S.; Vedel, V. |
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Title |
Impact of sea-level and climatic changes on the Amazon coastal wetlands during the late Holocene |
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Journal Article |
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Year |
2009 |
Publication |
Vegetation History and Archaeobotany |
Abbreviated Journal |
Veg. Hist. Archaeobot. |
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18 |
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6 |
Pages |
425-439 |
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Mangrove; Marajo Island; Pollen analysis; Sea-level |
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Wetland dynamics in northern Brazil during the Holocene were studied by pollen analysis and AMS radiocarbon dating of three cores. Near the Amazon mouth region, covered mainly by primary Amazon coastal forest and herbaceous vegetation, the pollen record indicates the dominance of mangroves between 4800 and 1100 cal yr B.P. A contraction of the mangrove area and an expansion of herbaceous and fern vegetation occurred between 1100 and 750 cal yr B.P. The period between 750 and 200 cal yr B.P. is characterized by an expansion of mangrove and a decrease in herbaceous and fern vegetation. This trend continued until the present. On Atalaia Island, the sediment core indicates a period with poor pollen preservation between 830 and 630 cal yr B.P. Between 630 and 330 cal yr B.P., mangroves expanded. Later, up to 45 cal yr B.P., the mangrove area decreased and the herbaceous vegetation expanded. During the last hundred years, the relative sea-level rise most probably favored the mangrove expansion as far as the topographically highest sector on this island, while the herbaceous vegetation decreased. The pollen data from Agua Preta Lake indicate dry conditions, as reflected by the poor pollen preservation between 390 and 240 cal yr B.P. Between 240 and 60 cal yr B.P., restinga and Amazon coastal forest with palms dominated this region. For the last 120 years, the record indicates an expansion of the mangrove area. However, recent confinement of mangrove development to the topographically highest area, and the loss of mangrove areas on the lowest surfaces have led to a net loss of mangrove coverage during the last decades. |
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[Lisboa Cohen, Marcelo Cancela; Smith, Clarisse Beltrao; Soares Matos, Hellen Rosy] Fed Univ Para, Postgrad Program Geol & Geochem, Lab Coastal Dynam, BR-66077530 Belem, PA, Brazil, Email: mcohen@ufpa.br |
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SPRINGER |
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0939-6314 |
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ISI:000271191800001 |
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EcoFoG @ eric.marcon @ |
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193 |
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Author |
Campillo, F.; Rossi, V. |
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Title |
Convolution Particle Filter for Parameter Estimation in General State-Space Models |
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Journal Article |
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Year |
2009 |
Publication |
IEEE Transactions on Aerospace and Electronic Systems |
Abbreviated Journal |
IEEE Trans. Aerosp. Electron. Syst. |
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Volume |
45 |
Issue |
3 |
Pages |
1063-1072 |
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The state-space modeling of partially observed dynamical systems generally requires estimates of unknown parameters. The dynamic state vector together with the static parameter vector can be considered as an augmented state vector. Classical filtering methods, such as the extended Kalman filter (EKF) and the bootstrap particle filter (PF), fail to estimate the augmented state vector. For these classical filters to handle the augmented state vector, a dynamic noise term should be artificially added to the parameter components or to the deterministic component of the dynamical system. However, this approach degrades the estimation performance of the filters. We propose a variant of the PF based on convolution kernel approximation techniques. This approach is tested on a simulated case study. |
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC |
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0018-9251 |
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ISI:000270225500017 |
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EcoFoG @ eric.marcon @ |
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194 |
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