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Itabuna, Brazil

Martins L.C.B.,State University of Maranhao | Delabie J.H.C.,Laboratorio Of Mirmecologia | Serrao J.E.,Federal University of Vicosa
Tropical Zoology

In social insects, secretions of the exocrine gland may modulate their behavior. Although many glands have their functions elucidated, this is absent for the intramandibular glands in ants. To study the function of intramandibular gland secretions in the ant Neoponera villosa, its compounds were subjected to behavioral analyses. These analyses revealed a significant increase in the walking time of ants exposed to the nestmate mandible extract. The results suggest that intramandibular gland compounds of N. villosa may play the role of alarm or scent trial pheromones. © 2016 Istituto per lo Studio degli Ecosistemi of the Consiglio Nazionale delle Ricerche, Firenze Source

Guerrero R.J.,University of Magdalena | Guerrero R.J.,Central University of Venezuela | Delabie J.H.C.,Laboratorio Of Mirmecologia | Dejean A.,French National Center for Scientific Research
Journal of Hymenoptera Research

We describe five new species in the aurita group of the genus Azteca: Azteca andreae sp. n. (French Guiana), Azteca diabolica sp. n. (Panama), Azteca laurae sp. n. (Brazil), Azteca linamariae sp. n. (Brazil and Colombia) and Azteca snellingi sp. n. (Panama). Four of these new species are based on gynes, while the last is based only on the worker caste. All of them bear the aurita group characteristics. The second taxon is remarkable, as it differs from all of the other members of the group in the exaggerated, horn-like extensions of the posterolateral vertex margins. Azteca snellingi sp. n. is named in honor of our colleague, Roy Snelling, in tribute to his life-long contribution to knowledge of the world of Hymenoptera. A key to all known species of the aurita group, based on gynes, is provided. We report also for the first time an intercast case for the genus Azteca, based on an Azteca schimperi specimen. Source

Barros L.A.C.,Federal University of Vicosa | Mariano C.S.F.,Laboratorio Of Mirmecologia | Mariano C.S.F.,University Estadual Of Santa Cruz | Pompolo S.G.,Federal University of Vicosa

Cytogenetic studies have been carried out on more than 750 ant taxa and are an important tool in evolutionary, taxonomic and phylogenetic studies. However, less than 10% of the species reported in the tribe Attini have been studied. The aim of the present study was to describe the chromosomes of five attine ants collected in Viçosa, Minas Gerais state, Brazil, at present unknown. The ant karyotypes reported are: Sericomyrmex sp. (2n = 50, 44m + 6sm, n = 25, 22m + 3sm); Trachymyrmex relictus (2n = 20m); Trachymyrmex sp. (2n = 22, 18m + 4sm); Apterostigma madidiense (n = 23, 7m + 10sm + 5st + 1a) and Apterostigma steigeri (2n = 22, 20m + 2sm). C-banding showed that heterochromatin was present in the centromeric region of all chromosomes of T. relictus. Future cytogenetic studies on members of the tribe Attini will provide important information to discuss chromosome evolution in this ant group. © 2013 Copyright Dipartimento di Biologia Evoluzionistica, Università di Firenze. Source

Lopes D.T.,Servidao Reduzino Vergilino Teixeira | Lopes J.,State University Londrina | do Nascimento I.C.,State University of Southwest Bahia | Delabie J.H.,Laboratorio Of Mirmecologia
Iheringia - Serie Zoologia

Considering the poor knowledge about the ant fauna of the state of Paraná, Brazil, this study aimed to compare the ant assemblages in three environments (primary forest, reforested area and secondary growth forest) of Mata dos Godoy State Park, municipality of Londrina. This study was carried out between December 2004 and March 2005. Ant collections were made using sardine baits and pitfall traps. We collected 102 ant species belonging to 38 genera of nine subfamilies. Myrmicinae was the richest subfamily (58 spp.) followed by Formicinae (20 spp.), Ponerinae (9 spp.), Ectatomminae, Heteroponerinae, Ecitoninae and Pseudomyrmecinae (3 species each), Dolichoderinae (2 spp.) and Proceratiinae (1 specie). The richest genera were Pheidole Westwood, 1839 and Camponotus Mayr, 1861, respectively with 14 and 11 species. The primary forest showed the highest richness values, number of exclusive species and diversity (92 spp., 20 spp. and H′ = 3.51, respectively), followed by the reforestation area (73 spp., 6 spp. And H′ = 3.47) and the secondary growth forest (67 spp., 4 spp. and H′= 3.34). The similarity values between the three environments were rather high. In each sample series, the observed richness was between 33 and 53 species and the estimated richness was between 35 and 86 species. The occurrence of seven guilds of ants was defined: omnivore species, specialist predators, generalist predator litter, armyants, vegetation dominant, soil dominant and fungus growers. Source

Azevedo D.O.,Federal University of Vicosa | Zanuncio J.C.,Federal University of Vicosa | Delabie J.H.C.,Laboratorio Of Mirmecologia | Serrao J.E.,Federal University of Vicosa
Journal of Insect Physiology

Workers of the ant species Ectatomma tuberculatum (Ectatomminae) have active ovaries and lay eggs that are eaten by the queen and larvae (trophic eggs). Vitellogenins are the main proteins found in the eggs of insects and are a source of nutrients. The aim of this study was to characterize the period of vitellogenin production in workers of E. tuberculatum. The vitellogenin was identified from queen and worker eggs by SDS-PAGE. Anti-vitellogenin antibodies were obtained and used to detect this protein in the fat body and haemolymph of workers at different ages. Vitellogenin from E. tuberculatum consists of two polypeptides of 31 and 156. kDa. In the eggs of queens, the 156. kDa polypeptide is cleaved into two subunits of 36 and 123. kDa. The analysis of the haemolymph of workers showed that the secretion of vitellogenin varies with age. The secretion is initiated around the fifth day after emergence, with peak production from days 20 to 60, and stops around day 100. The variation in production is related to the different activities performed by the workers within the colony, suggesting that vitellogenin may have an important role in maintaining age polyethism. © 2011 Elsevier Ltd. Source

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