Navegando por Assunto "Cave-dwelling"

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Artigo
Expanding the range of the troglobitic millipede Pseudonannolene ambuatinga Iniesta & Ferreira, 2013: insights into its distribution and conservation status (Spirostreptida, Pseudonannolenidae)
(2024-06-10) Iniesta, Luiz Felipe Moretti ; Oliveira, Marcus Paulo ; Brescovit, Antonio ; Bouzan, Rodrigo Salvador
Pseudonannolene Silvestri, 1895 (Spirostreptida, Pseudonannolenidae) is one of the most common genera of millipedes in Brazilian caves. To date, only three troglobitic species are known in a list of 56 species described for the genus. In this study, we report new records of the cave-dwelling species Pseudonannolene ambuatinga Iniesta & Ferreira, 2013 in Minas Gerais state. These records extend its distribution by approximately 600 km2, making it the most widely distributed cave-dwelling millipede in the country. We also provide a new assessment of its conservation status based on the records and threats to its populations.
Artigo
The ticking clock in the dark: review of biological rhythms in cave invertebrates
(2024-05-09) de Souza, Priscila Emanuela; Souza-Silva, Marconi; Ferreira, Rodrigo Lopes
Circadian clocks, internal mechanisms that generate 24-hour rhythms, play a crucial role in coordinating biological events with day-night cycles. In light-deprived environments such as caves, species, particularly isolated obligatory troglobites, may exhibit evolutionary adaptations in biological rhythms due to light exposure. To explore rhythm expression in these settings, we conducted a comprehensive literature review on invertebrate chronobiology in global subterranean ecosystems, analyzing 44 selected studies out of over 480 identified as of September 2023. These studies revealed significant taxonomic diversity, primarily among terrestrial species like Coleoptera, with research concentrated in the United States, Italy, France, Australia, and Brazil, and a notable gap in African records. Troglobite species displayed a higher incidence of aperiodic behavior, while troglophiles showed a robust association with rhythm expression. Locomotor activity was the most studied aspect (>60%). However, approximately 4% of studies lacked information on periodicity or rhythm asynchrony, and limited research under constant light conditions hindered definitive conclusions. This review underscores the need to expand chronobiological research globally, encompassing diverse geographical regions and taxa, to deepen our understanding of biological rhythms in subterranean species. Such insights are crucial for preserving the resilience of subsurface ecosystems facing threats like climate change and habitat loss.
Artigo
Two new cavernicolous species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from Lagoa Santa karst, Minas Gerais, Brazil
(2024-04-04) Schimonsky, Diego Monteiro Von
Two new pseudoscorpion species of the genus Pseudochthonius Balzan, 1892 are described from caves in the Lagoa Santa karst area in Southeast Brazil. Pseudochthonius limettioides sp. nov. was collected in ten caves and is a troglobite that lacks eyes and body pigmentation. Pseudochthonius lundi sp. nov. was collected in three caves and is considered a troglophile with only one pair of eyes. Both species might be threatened by mining projects and more studies are needed to better understand many aspects of their biology.