Sexual castes of Trachymyrmex fuscus (Formicidae: Attini) performing worker tasks

Araújo, Márcio da Silva; Oliveira, João Paulo Ribeiro; Souza, Danival José de; Oliveira, Marco Antônio de; Jesus, Flávio Gonçalves de

doi:10.1590/0103-8478cr20150189

Cienc. Rural

2015

DOI: 10.1590/0103-8478cr20150189

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Sexual castes of Trachymyrmex fuscus (Formicidae: Attini) performing worker tasks

Márcio da Silva Araújo

João Paulo Ribeiro Oliveira

Danival José de Souza

et al.

Abstract: The main of this research was to report an atypical foraging behavior in a colony of Trachymyrmex fuscus, situated in "Cerrado" (savanna ecoregion of Goiás, Brazil

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Population-Based Cytogenetic Banding Analysis and Phylogenetic Relationships of the Neotropical Fungus-Farming Ant Trachymyrmex holmgreni Wheeler, 1925

Micolino¹,

Cristiano²,

Cardoso³

2019

Cytogenet Genome Res

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Trachymyrmex is one of the most species-rich genera within fungus-farming ants and presents intraspecific cytogenetic polymorphisms as well as possible cryptic species. This ant genus is currently paraphyletic. Therefore, to unravel systematic and taxonomic misunderstandings, it is necessary to incorporate new information. We aimed to cytogenetically and genetically examine Trachymyrmex holmgreni populations from southern and northern Brazil to identify intraspecific chromosomal variations that support incipient speciation and reveal the species' position in a molecular phylogeny. Our cytogenetic approach did not show population variation in the mapping of both 18S rDNA and the TTAGG(6) motif, presenting instead a pattern characteristic of correlated species. However, the clustered pattern of the microsatellite GA(15) showed significant differences among populations: a well-defined block in each homologue, distinctly irregular signs between homologues, and blocks in 2 pairs of homologues. Our phylogenetic reconstruction yielded unexpected results, grouping representatives of 3 former morphological groups into 1 clade, namely T. urichii, T. papulatus, and T. holmgreni. Previously, it was suggested that northern and southern populations of T. holmgreni may be undergoing incipient speciation, but we can only indicate that the southernmost population differs prominently from the others in its distribution pattern of the microsatellite GA(15). Our study also supports the uniformity of karyotypes and repetitive DNA from both telomeric sequences and ribosomal DNA in Trachymyrmex studied here. In addition, we clarify some phylogenetic uncertainties within the genus and suggest further relevant systematic changes. Finally, additional studies utilizing other probes and additional populations may allow the detection of hidden genetic variation.

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Population-Based Cytogenetic Banding Analysis and Phylogenetic Relationships of the Neotropical Fungus-Farming Ant Trachymyrmex holmgreni Wheeler, 1925

Micolino¹,

Cristiano²,

Cardoso³

2019

Cytogenet Genome Res

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Sexual castes of Trachymyrmex fuscus (Formicidae: Attini) performing worker tasks

Abstract: The main of this research was to report an atypical foraging behavior in a colony of Trachymyrmex fuscus, situated in "Cerrado" (savanna ecoregion of Goiás, Brazil

Cited by 1 publication

References 9 publications

Population-Based Cytogenetic Banding Analysis and Phylogenetic Relationships of the Neotropical Fungus-Farming Ant <b><i>Trachymyrmex holmgreni</i></b> Wheeler, 1925

Population-Based Cytogenetic Banding Analysis and Phylogenetic Relationships of the Neotropical Fungus-Farming Ant <b><i>Trachymyrmex holmgreni</i></b> Wheeler, 1925

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