BIOLOGIA SUBTERRÂNEA
URI permanente para esta coleçãohttps://bdc.icmbio.gov.br/handle/cecav/3
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Item xploring uncharted waters: insights into groundwater zooplankton of the Brazilian semiarid region.(2024-07-11) Carolina Teixeira Puppin-Gonçalves; Diego Medeiros Bento; Gilmar Perbiche-Neves; Rodrigo Lopes Ferreira; Marconi Souza-Silva; Vanessa Becker; Juliana Déo DiasThe subterranean environments of the Caatinga drylands (Brazilian biome) host a diverse array of aquatic systems and diversity, comprising both lentic and lotic ecosystems. Species diversity in these environmnts has been overlooked and remains poorly understood, especially regarding zooplankton. We studied the species richness and composition of zooplankton living in groundwater of the Caatinga drylands and explored how they vary in relation to habitat type (lentic and lotic) by testing two hypotheses: (1) species richness, gamma diversity, and zooplankton density are higher in lentic environments and (2) zooplankton species composition differs between habitat types. We sampled 12 lentic and lotic groundwater environments quarterly for 2 years, and identified 100 species of zooplankton in groundwater environments, including testate amoebae (50 species), Rotifera (25 species), Copepoda (16 species), and Cladocera (9 species). Rotifer species richness and copepod density differed between lentic and lotic habitats, as did zooplankton composition. Additionally, each habitat was found to harbor distinct indicator species based on their ecology and morphological characteristics. These findings contribute to current understanding of groundwater biodiversity and ecology, providing support for freshwater and speleological management and conservation programs.Item 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 QueirozFew 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.Item Two new species of freshwater flatworms (Platyhelminthes: Tricladida: Continenticola) from South American caves(Zootaxa, 2016) Souza, Stella; Morais, Ana Laura; Bichuette, Maria Elina; Leal-Zanchet, AnaArtigo sobre duas novas espécies de vermes planos de água doce (Platyhelminthes: Tricladida: Continenticola) das cavernas sul-americanas