Logo do repositório
Comunidades & Coleções
Navegar
Sobre
  • English
  • Español
  • Português do Brasil
Entrar
Novo usuário? Clique aqui para cadastrar.Esqueceu sua senha?
  1. Início
  2. Pesquisar por Autor

Navegando por Autor "Barros, Jennifer S."

Filtrar resultados informando as primeiras letras
Agora exibindo 1 - 2 de 2
  • Resultados por Página
  • Opções de Ordenação
  • Imagem de Miniatura
    Item
    Artigo
    Big family, warm home, and lots of friends: Pteronotus large colonies affect species richness and occupation inside caves
    (2023-03-01) Barros, Jennifer S.; Bernard, Enrico
    Roosts are essential for the survival of most animals. Due to homothermic requirements, mammals are particularly dependent on roost quality and availability. Bats select their roosts in a species-specific way, likely related to species´ different physiological and adaptive needs. Unlike species whose individuals roost solitarily, roost selection is critical for bats forming large colonies due to the requirements for maintaining thousands of individuals in a single shelter. This is the case of Pteronotus (Mormoopidae), whose colonies reach hundreds of thousands of bats. Using captures, bioacoustics, and automated censuses, we evaluated how cave size, ceiling characteristics, environmental stability, temperature, and humidity influence the formation of exceptionally large colonies, species richness and composition in caves in north-eastern Brazil. We expected that colonies would be positively related to cave size and stability, internal cave selection would be species-specific, but larger and more environmentally stable caves would have higher richness. Pteronotus colonies were positively related to cave size, stability, and ceiling characteristics, and their presence strongly influenced cave temperature variation. Species richness was positively correlated to a cave stability index. Species other than Pteronotus preferred different climatic and ceiling characteristics. We detected an indirect influence of the large colonies of Pteronotus on the species richness and occupation inside caves. On the other hand, such caves favor species coexistence, as they offer a range of microenvironments, reducing niche overlap in their interior. Pteronotus gymnonotus and Pteronotus personatus are both key- and umbrella-species for cave ecosystems, stressing the need for specific conservation strategies in Brazil.
  • Imagem de Miniatura
    Item
    Artigo
    Species richness, occurrence and rarity of bats in Brazilian caves
    (2023-10-27) Barros, Jennifer S.; Bernard, Enrico
    Caves are among the most important roosts of hundreds of bat species worldwide. However, caves can be formed in different lithologies. Cave structure and characteristics, which are shaped by lithology, can, in turn, influence roost preferences for different bat species. Therefore, cave lithology and characteristics can help us to better understand why some bat species may be rare in some caves and common in others. Brazil is a continental country, rich in bat species (181 spp.), lithologies and caves (>23 000). However, only a small fraction of the known caves has been sampled for bats so far, with no emphasis on the role lithology may have. Based on a literature review and using data on bat occurrence, in this study, we investigated the influence of lithology on bat species richness and rarity in Brazilian caves. We evaluated 117 studies, including data from 552 caves, and updated the number of bat species occurring in Brazilian caves to 81. Species richness differed between lithologies: carbonate caves had higher species richness, whereas iron caves had lower species richness. Richness was positively related to carbonate caves and with cave size: the bigger the cave, the more species-rich it tends to be. Overall, caves in the Cerrado had the highest species richness, followed by Atlantic Forest, Caatinga caves and Amazonian caves. Thirteen species can be considered as primarily cave-dwelling species, recorded in 10%–20% of the caves. Rarity was common among primarily cave-dwelling species. Nearly 22% of the sampled caves harboured endangered species, reaching 53% of the species-richest caves. Our analysis provides a comprehensive baseline for bat fauna in different types of caves in Brazil. Even so, we strongly recommend the establishment of long-term monitoring of population trends for bats in Brazilian caves, which is necessary information but almost non-existing for the country.

Caso não concorde com a publicação de qualquer documento neste repositório, mande uma mensagem pela página do Fale Conosco.

ICMBio © 2025

Logo do repositório COAR Notify