Navegando por Autor "Lima, Sergio Maia Queiroz"

Agora exibindo 1 - 4 de 4

Artigo
Before it’s too late: priority areas for conservation of cryptic and threatened species of troglobitic arthropods in the Brazilian semiarid
(2024-04-18) Bento, Diego de Medeiros; Ferreira, Rodrigo Lopes; Vasconcelos, Santelmo; Lima, Jamily Lorena Ramos de; Oliveira, Guilherme; Silva, Tiago Castro; Lima, Sergio Maia Queiroz
One of the most important steps in identifying priority areas for conservation is the assessment of species richness and their extinction risks. While most species remain undescribed, the identification of cryptic lineages is frequent in phylogenetic and phylogeographic studies. This is particularly common in troglobites, exclusively subterranean organisms. The Jandaíra Formation, in the Brazilian semiarid, combines the occurrence of extensive karstic areas with hundreds of caves and subterranean aquifers in a region with intense paleoclimatic changes. This region is recognized for the richness of troglobitic species, some of which are widely distributed in heterogeneous areas. This suggests cryptic lineages that can be differentially exposed to anthropogenic threats, with distinct extinction risks regarding the nominal taxa of which they putatively belong. To test it, a large sampling was conducted and, by means of lineage delimitation analyses, the genetic structure of four troglobitic taxa, three aquatic and one terrestrial, was evaluated. In addition, the extinction risk of these lineages was assessed and priority areas for conservation were identified. The results indicated that while Cirolanidae sp. 1 (Isopoda) is a single species widely distributed, Cirolanidae sp. 2, Potiberaba porakuara (Amphipoda) and Kinnapotiguara troglobia (Hemiptera) present an extensive diversity of cryptic and endemic lineages, most of which are likely new threatened species. Furthermore, two priority areas for conservation of these lineages were identified. Thus, comparative phylogeography may represent a first step in the conservation of subterranean taxa, indicating areas that should be prioritized in a context of increasing threats and dwindling conservation resources.
Artigo
Diversity and conservation of fishes from karstic areas of the Jandaíra Formation in the Brazilian semiarid
(2023-03-06) Abrantes, Yuri Gomes; Bennemann, Ana Beatriz Alves; Lustosa-Costa, Silvia Yasmin; Bento, Diego de Medeiros; Ramos, Telton Pedro Anselmo; Lima, Sergio Maia Queiroz
Few studies have focused on non-troglomorphic fishes occurring in Brazilian caves, especially those in the Caatinga region. The present study is the first survey of fishes from karstic areas of the Jandaíra Formation in Rio Grande do Norte State, northeastern Brazil. This region is characterized by a high concentration of caves and a rich subterranean biodiversity, especial-ly of troglobitic invertebrates, but remains considered a gap on the knowledge of the subterranean ichthyofauna in Brazil. Four field expeditions were carried out covering two dry and two rainy seasons, in 2018 and 2019, in 23 localities in small river ba-sins along the western part of the Jandaíra Formation. A total of 829 fish specimens, none of them troglomorphic, was captured and identified as belonging to 25 species of 12 families and five orders. Amongst them, four species are endemic of the Mid-Northeastern Caatinga ecoregion, and two non-native species were recorded. Habitats were classified into three categories: su-perficial, associated to cave, and cave. Although no troglomorphic fish species was found in this study, we recorded 64.1% of the Apodi-Mossoró river ichthyofauna occurring in caves or associated to caves, corroborating the hypothesis that part of the ichthyofauna exploits these environments as a refuge during the dry season. In addition, we suggest conservation policies for the maintenance of subterranean and aquatic semiarid ecosystems in the Jandaira formation, which is currently under threat due to anthropogenic activities, such as mining and deforestation.
Artigo
Molecular delimitation of the seasonal killifishes of the Hypsolebias antenori species group (Cyprinodontiformes, Rivulidae), with description of two new species from the Caatinga coastal basins, northeastern Brazil
(2023-12-22) Abrantes, Yuri Gomes ; Ramos, Telton Pedro Anselmo ; Bento, Diego de Medeiros ; Lima, Sergio Maia Queiroz
Hypsolebia antenori is a seasonal killifish considered to be broadly distributed along the Caatinga’s basins of northeastern Brazil, with records in the coastal drainages of the rio Pacoti, rio Jaguaribe, córrego Virgílio and rio Apodi-Mossoró basins. Based on morphological characters and molecular phylogenetic reconstructions, it was possible to diagnose two new species and restrict H. antenori to the rio Jaguaribe basin. Hypsolebias gongobira new species is described from a temporary pool in the rio Pacoti basin in Ceará State, in syntopy with the species threatened H. longignatus. Hypsolebias bonita new species occurs in the floodplains of the rio Apodi-Mossoró basin and in the córrego Virgílio microbasin in the Furna Feia National Park, in Rio Grande do Norte State. We also discuss the conservation status of these new species and how the São Francisco Interbasin Water transfer, and the agricultural and urban expansion in the semiarid may be adversely affecting these seasonal killifishes.
Artigo
The bats of Rio Grande do Norte state, northeastern Brazil
(Biota Neotropica, 2018-04-16) Vargas-Mena, Juan Carlos; Pereira, Kleytone Alves; Barros, Marília Abero Sá; Barbier, Eder; Schmidt, Eugenia Cordero; Lima, Sergio Maia Queiroz; Herrera, Bernal Rodríguez; Venticinque, Eduardo Martins