Examinando por Autor "Rivera Correa, Mauricio"

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    PublicaciónAcceso abierto
    Colonizing the Eastern Colombian Andes: Biogeographic reconstruction and speciation patterns of the genus Pristimantis
    (Universidad de los Andes, 2025-06-04) Tovar Ortiz, Angie Marcela; Crawford, Andrew Jackson; Rivera Correa, Mauricio; Madriñán Restrepo, Santiago; Padial, José Manuel; Facultad de Ciencias::Biomics
    The Northern Andes harbor one of the highest amphibian diversities worldwide, yet the evolutionary and biogeographic processes shaping this diversity remain insufficiently understood. We investigated the molecular phylogenetics, divergence times, and ancestral area reconstruction of Pristimantis (Craugastoridae) frogs across the Eastern Cordillera of Colombia. Using six gene fragments (12S, 16S, COI, CYTB, RAG1, TYR), we reconstructed a time-calibrated phylogeny for 273 species, representing 41.7% of the genus’ recognized diversity. Our results reveal that Pristimantis species of the Eastern Cordillera do not form a monophyletic group, but instead derive from at least six independent colonization events throughout the Neogene. These colonizations were followed by extensive in situ diversification, tightly associated with phases of accelerated Andean uplift and subsequent climatic shifts. Patterns of divergence suggest that species diversification was shaped by a combination of allopatric isolation, flickering connectivity during Pleistocene climatic oscillations, and parapatric speciation along elevational gradients. Ancestral state reconstructions further indicate that both niche conservatism and ecological divergence contributed to the elevational structure observed across clades. These findings highlight the Eastern Cordillera as a dynamic evolutionary mosaic where geological, climatic, and ecological forces have jointly promoted diversification, offering new insights into the processes driving speciation in tropical montane frogs.
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    PublicaciónAcceso abierto
    Following a trail of biological collections records, historical distributions, and environmental DNA to find the lost harlequin toads of Colombia
    (Universidad de los Andes, 2023-12-12) Vivas Barreto, Daniel Felipe; Crawford, Andrew Jackson; 335316; Rivera Correa, Mauricio; Caballero Gaitán, Susana; Facultad de Ciencias::Biomics
    Neotropical harlequin toads (Anura: Bufonidae: Atelopus) face a severe threat, with 83% of the 94 assessed species classified as critically endangered or extinct by the IUCN. Their populations have experienced a significant decline, primarily due to emerging infectious diseases, even in pristine environments. In Colombia, where 41 native species exist, most have not been sighted in over three decades, raising concerns about potential extinctions. To enhance the chances of locating these elusive amphibians, we utilized data from biological collections, identifying key variables such as precipitation, month, stages, and sex that explain SVL length throughout the year. This information guides to the optimal time and location for search efforts. Additionally, species distribution models (SDMs) were employed in conjunction with environmental DNA (eDNA) analysis. SDMs, utilizing presence data from eDNA samples, are enhanced by incorporating environmental variables, facilitating a comprehensive understanding of the habitat requirements of each species, which contributes to targeted conservation efforts. The combination of eDNA and SDMs directs conservation projects towards effective strategies for the protection of Atelopus. Our study focused on sites with stable Atelopus populations of three species, two high mountains and one lowland, which served as a proof of concept, and two sites with severely depleted but persistent populations in the highlands. As we navigate the imperative task of safeguarding these frogs from extinction, the integration of innovative tools like eDNA and SDMs becomes indispensable. These findings are instrumental in shaping future conservation initiatives for this endangered group.
  • Miniatura
    PublicaciónAcceso abierto
    The reproductive biology of the glassfrog centrolene solitaria: breeding behavior, advertisement call, and tadpole morphology
    (Universidad de los Andes, 2012-07-13) Basto Riascos, Maria Camila; Vargas Salinas, Fernando; 94378416; Rivera Correa, Mauricio; Link Ospina, Andrés; Facultad de Ciencias::Grupo de Ecofisiología del Comportamiento y Herpetología
    The present study, focused in studying aspects related to the reproductive biology of the glassfrog Centrolene solitaria, a species that lacks associated natural history information. Between March and October 2018, we studied a population of C. solitaria in a locality in the department of Huila, Colombia. We conducted nocturnal and diurnal surveys, we calculated mating rates and parental care for males, examined phenotypic correlates of mating success, and described some aspects of the natural history of the species. We found that the mating success of the males increased with the number of nights they remain active, but not with the body size or the calling-perch height. Parental care was carried out exclusively by males, and the period of attention to the eggs is extended. The egg positions, deposited in riparian vegetation, consist of an average of 15 eggs (12-23), located on the upper part of the leaves between 0.6 - 3.0 m in height. The advertisement call of C. solitaria consists of three to four notes pulsed at an average frequency of 6298.67 Hz (6201.3-6378.8 Hz); the mean note duration was 0.036 s (0.031-0.045 s), and the mean pulse duration was 0.017 s (0.011-0.032 s). The tadpole is fosorial, slightly pigmented, with an elliptical body from the lateral view, and an anteroventral mouth with a dental formula LTRF: 2 (2) / 3 (1).