Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Brésil → A importância da diagonal árida (Caatinga, Cerrado e Chaco) no isolamento de populações de espécies de Euglossina (Insecta : Hymenoptera : Apidae) nos domínios morfoclimáticos da Amazônia e da Mata Atlântica : um estudo filogeográfico

Universidade Federal de Minas Gerais (2013)

A importância da diagonal árida (Caatinga, Cerrado e Chaco) no isolamento de populações de espécies de Euglossina (Insecta : Hymenoptera : Apidae) nos domínios morfoclimáticos da Amazônia e da Mata Atlântica : um estudo filogeográfico

Cardoso Yazbeck Carolina Ferreira

Titre : A importância da diagonal árida (Caatinga, Cerrado e Chaco) no isolamento de populações de espécies de Euglossina (Insecta : Hymenoptera : Apidae) nos domínios morfoclimáticos da Amazônia e da Mata Atlântica : um estudo filogeográfico

Auteur : Cardoso Yazbeck Carolina Ferreira

Université de soutenance : Universidade Federal de Minas Gerais

Grade : Doutora em Ecologia. 2013

Résumé partiel
The subtribe Euglossina (Hymenoptera : Apidae : Apini), broadly distributed in the Neotropical region, is currently represented by approximately 220 species, being most diversified in rainforest ecossystems. This study evaluates the phylogeographic structure of species/sister-species-pairs of Euglossina, with occurrence both in Amazonic (AmF) and the Atlantic (AtF) rainforests. The interspecific and interpopulational historic relationships are evaluated here using as molecular marker part of the mitochondrial gene cytochrome c oxidase subunit I (COI). Here, the hypothesis is tested that the separation between the AmF and the AtF by the arid diagonal composed by the Caatinga, Cerrado and Chaco domains has acted in the isolation of Euglossina populations, producing cryptic-species pairs. Male specimens from Euglossa (Glossurella) crassipunctata [n = 98 ; 579 base pairs (bp)] and other four pairs of species with strong affinity are included in this study : (i) Euglossa (Euglossa) bidentata (n = 10 ; AmF) and Euglossa (Euglossa) marianae (n = 45 ; AtF ; 532 bp) ; (ii) Euglossa (Euglossa) mixta (n = 34 ; AmF) and Euglossa (Euglossa) calycina (n = 17 ; AtF ; 533 bp) ; (iii) Euglossa (Euglossa) iopyrrha (n = 1 ; AmF) and Euglossa (Euglossa) botocuda (n = 39 ; AtF ; 503 bp) ; (iv) Eulaema (Eulaema) bombiformis (n = 21 ; AmF and Central America) and Eulaema (Eulaema) niveofasciata (n = 52 ; AtF ; 558 pb). Bayesian inference and haplotype networks suggest that the South American arid diagonal has acted on the isolation of E. crassipunctata, supporting the recent recognition of AtF populations as E. clausi, those from the AmF as E. moratoi, restricting the name E. crassipunctata only to Central American populations. The sequence of vicariant events herein inferred for the E. calycina/E. mixta pair is coincident with that obtained for species groups of Geotrigona and Paratrigona. Based on the previous estimation of the minimum age of E. mixta (5 Ma), it is possible that the arid diagonal (in one of its occurrence since the end of Miocene) is the causal factor of the separation between the populations of AtF and AmF in this group. For the crassipunctata group, the contrary was observed, which agrees with reported vicariant events of species groups of Partamona and some of Geotrigona. Previous estimation of the minimum age of the crassipunctata group ( 14.7 Ma) suggests that the separation between Central America and AmF is contemporary with the transgression of the Maracaibo Sea (middle Miocene) and that the break between the AmF and AtF possibly occurred in the Pleistocene. The distinction between E. bombiformis and E. niveofasciata is not supported in the results herein presented. However, it should be considered that morphological differences, albeit subtle, congruent with the geographical disjunction suggest the existence of barriers between these populations. The weak structuring of COI phylogeny found for the E. niveofasciata/E. bombiformis pair may indicate persistence of ancestral polymorphism which, in association with low interspecific divergence values, support the hypothesis of recent split between these species lineages, coincident with the formation of the xeric diagonal of South America in the Pleistocene. It is possible that E. niveofasciata and E. bombiformis are real entities, not distinguishable by the COI, and the analysis of other genes, along with morphological characters might help to elucidate this problem.

Présentation

Version intégrale (6,5 Mb)

Page publiée le 15 avril 2019