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Search Results: 1 - 10 of 15363 matches for " Jacques Hubert Charles Delabie "
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New range of the Brazilian endemic Platythyrea exigua (Hymenoptera: Formicidae: Platythyreini)
Jacques Hubert Charles Delabie
Revista de Biología Tropical , 2001,
Advances in Neotropical Myrmecology
Jacques Hubert Charles Delabie,Fernando Fernández,Jonathan Majer
Psyche , 2012, DOI: 10.1155/2012/286273
Stridulations Reveal Cryptic Speciation in Neotropical Sympatric Ants
Ronara Souza Ferreira,Chantal Poteaux,Jacques Hubert Charles Delabie,Dominique Fresneau,Fanny Rybak
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015363
Abstract: The taxonomic challenge posed by cryptic species underlines the importance of using multiple criteria in species delimitation. In the current paper we tested the use of acoustic analysis as a tool to assess the real diversity in a cryptic species complex of Neotropical ants. In order to understand the potential of acoustics and to improve consistency in the conclusions by comparing different approaches, phylogenetic relationships of all the morphs considered were assessed by the analysis of a fragment of the mitochondrial DNA cytochrome b. We observed that each of the cryptic morph studied presents a morphologically distinct stridulatory organ and that all sympatric morphs produce distinctive stridulations. This is the first evidence of such a degree of specialization in the acoustic organ and signals in ants, which suggests that stridulations may be among the cues used by these ants during inter-specific interactions. Mitochondrial DNA variation corroborated the acoustic differences observed, confirming acoustics as a helpful tool to determine cryptic species in this group of ants, and possibly in stridulating ants in general. Congruent morphological, acoustic and genetic results constitute sufficient evidence to propose each morph studied here as a valid new species, suggesting that P. apicalis is a complex of at least 6 to 9 species, even if they present different levels of divergence. Finally, our results highlight that ant stridulations may be much more informative than hitherto thought, as much for ant communication as for integrative taxonomists.
Neuropile organization in the brain of Acromyrmex (Hymenoptera, Formicidae) during the post-embryonic development
Soares, Paula Andréa Oliveira;Delabie, Jacques Hubert Charles;Serr?o, José Eduardo;
Brazilian Archives of Biology and Technology , 2004, DOI: 10.1590/S1516-89132004000400017
Abstract: neuropile is the region of the central nervous system where the synapses and neurons branching occur. during the development of an holometabolous insect can occurs break of the neurons fibers forming new axon and dendrites and their distribution in brain neuropile is organized so as to reflect specific nervous functions of adult insects. the components of this organization were observed and discussed in this study in the ant acromyrmex octospinosus, evidencing similar features to those described for a. subterraneus subterraneus, among other insects for the which ones this information is available.
Epigean ant communities in Atlantic Forest remnants of S?o Paulo: a comparative study using the guild concept
Macedo, Luciano Pacelli Medeiros;Berti Filho, Evoneo;Delabie, Jacques Hubert Charles;
Revista Brasileira de Entomologia , 2011, DOI: 10.1590/S0085-56262011000100012
Abstract: epigean ant communities in atlantic forest remnants of s?o paulo: a comparative study using the guild concept. the guilds constitute a valuable ecological tool, because they allow conducting comparisons among environments under different conditions. the ants can be used as ecological indicators, mainly for the monitoring of degraded forest areas. the aim of this research was to study guild organization among the epigeous formicidae living in atlantic forest remnants of the state of s?o paulo, brazil. ant collections were performed in three distinct atlantic forest biome areas: arboreal littoral vegetation ("restinga") (cananéia), semideciduous seasonal forest (piracicaba) and dense ombrophylousforest (pariquera-a?u). after identification, the ants were grouped into guilds, based on the ecological attributes of behavior and habit, according to the literature. nine guilds were found; the semideciduous seasonal forest ecosystem presented eight of them, followed by the arboreal sandbank (7) and dense ombrophylous forest (6). the guilds found were: litter omnivorous and scavengers, granivorous species, specialist predators living in litter and soil, litter generalist predators, subterranean mealybug-dependent species, army ants, dominant or subdominants arboreal, that occasionally forage on the ground, soil or litter dominant and fungus-growers, using feces and insect body fragments. the guilds found can be used in the monitoring of the mirmecofauna in the atlantic forest biome, supplying insights for further ecological studies.
Ant fauna (Hymenoptera, Formicidae) associated to arboreal nests of Nasutitermes spp: (Isoptera, Termitidae) in a cacao plantation in southeastern Bahia, Brazil
Santos, Pollyanna Pereira;Vasconcellos, Alexandre;Jahyny, Benoit;Delabie, Jacques Hubert Charles;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000300016
Abstract: ants are among the most common arthropods that colonize termite nests. the aim of this study was to identify the ant fauna associated to termite nests found in a cacao plantation in the county of ilhéus, bahia, brazil, with emphasis on the fauna that uses the nests as foraging and/or nesting environment. for this purpose, 34 active, decadent and abandoned nests of nasutitermes corniger, n. ephratae and nasutitermes sp., with different volumes and degrees of activity, were dissected. a total of 54 ant species, belonging to 23 genera and five subfamilies, was found in the constructions. the active, decadent and abandoned termite nests presented, respectively, six, eight and 48 ant species. crematogaster acuta and ectatomma tuberculatum were the most frequent species in the active and decadent nests, respectively, while the most frequent species in the abandoned nests were solenopsis pollux, thaumatomyrmex contumax and thaumatomyrmex sp. twenty-six ant species had true colonies within the termitaria. the formicidae species richness in the nests was inversely related to the degree of termite activity in the nests. the occurrence of living, decadent or abandoned termitaria of nasutitermes spp. in cacao plantations foments the heterogeneity of habitats available in the plantations and favors the maintenance of high diversity of organisms that use obligatory or opportunistically this substrate.
First record of the ant genus Probolomyrmex (Hymenoptera: Formicidae: Ponerini: Platythyreini) in Brazil
Jacques Hubert,Charles Delabie,Heraldo L. Vasconcelos,José M. S. Vilhena
Revista de Biología Tropical , 2001,
Tree-Fall Gaps Effects on Spider (Araneae) Assemblages in an Atlantic Forest Landscape in Northeastern Brazil  [PDF]
Marcelo Cesar Lima Peres, Kátia Regina Benati, Alessandra Rodrigues S. de Andrade, Marcos Vinicius Alvim Guimar?es, Tércio da Silva Melo, Antonio Domingo Brescovit, Jacques Hubert Charles Delabie
Open Journal of Animal Sciences (OJAS) , 2014, DOI: 10.4236/ojas.2014.43016
Abstract: The study investigates the effect of spatial and temporal tree-fall gaps structure on spiders’ assemblage in an Atlantic forest fragmented area in Brazil. It was conducted in the Michelin Ecological Preserve-REM (Bahia), 190 ha forest remnant. Samples were collected on leaf-litter (50 × 50 cm) at five tree-fall gaps formations (<150 m2), within five adjacent primary forest and five inner edge parcels. During 16 months (between May 2009 and October 2012), 480 m2 leaf-litter samples were collected, from which spiders were extracted using mini-Winkler traps. The observed and estimated richness of spider’s species was higher at the edge (p < 0.01). The habitat structures differ significantly among the three habitat types (MRPP, p < 0.01) and also during the tree-fall gaps aging gradient (MRBP, p < 0.01). There were significant differences on spiders’ species composition, comparing the three habitats (MRPP, p < 0.05). The composition of spider’s species changed as tree-fall gaps aged (MRBP, p < 0.05). We argue that the tree-fall gaps play, on a local scale, an important role in acting on the time-space distribution dynamics of spider’s species assemblages, although the time effect should still be evaluated.
Contribution of Cytogenetics to the Debate on the Paraphyly of Pachycondyla spp. (Hymenoptera, Formicidae, Ponerinae)
Cléa dos Santos Ferreira Mariano,Silvia das Gra as Pompolo,Janisete Gomes Silva,Jacques Hubert Charles Delabie
Psyche , 2012, DOI: 10.1155/2012/973897
Abstract: We present evidence of the paraphyly of the ant genus Pachycondyla resulting from our cytogenetic studies on 29 populations in 18 species from Brazil and French Guyana. It is likely that karyotypes with a large number of chromosomes and comprising mostly small acrocentric chromosomes in species within the Pachycondyla stricto sensu group resulted from a succession of centric fission events. On the other hand, karyotypes with a small chromosome number comprising mostly metacentric chromosomes are also interpreted as little derived and tend to undergo centric fission. The karyotypes of the group Neoponera are more heterogeneous and probably undergo successive cycles of rearrangements tending to increase the chromosome number by centric fission. The apicalis and verenae complexes form two probable sister groups that evolved independently due to centric fissions (verenae) and pericentric inversions (apicalis). Our results reveal the karyotype diversity in the genus and reinforce the hypothesis on the paraphyly of Pachycondyla.
Glandular Epithelium as a Possible Source of a Fertility Signal in Ectatomma tuberculatum (Hymenoptera: Formicidae) Queens
Riviane Rodigues da Hora,Jacques Hubert Charles Delabie,Carolina Gon?alves dos Santos,José Eduardo Serr?o
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010219
Abstract: The wax layer covering the insect's cuticle plays an important protective role, as for example, uncontrolled water loss. In social insects, wax production is well-known in some bees that use it for nest building. Curiously, mated-fertile queens of the ant Ectatomma tuberculatum produce an uncommon extra-wax coat and, consequently queens (mated-fertile females) are matte due to such extra cuticular hydrocarbon (CHC) coat that covers the cuticle and masks the brightness of the queens' cuticle while gynes (virgin-infertile queens) are shiny. In this study, histological analysis showed differences in the epidermis between fertile (i.e., queens or gynes with highly ovarian activity) and infertile females (gynes or workers with non developed ovaries). In fertile females the epidermis is a single layer of cubic cells found in all body segments whereas in infertile females it is a thin layer of flattened cells. Ultrastructural features showed active secretory tissue from fertile females similar to the glandular epithelium of wax-producing bees (type I gland). Different hypotheses related to the functions of the glandular epithelium exclusive to the E. tuberculatum fertile queens are discussed.
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