Potamotrygon magdalenae, una raya perteneciente a la familia Potamotrygonidae distribuida en la cuenca del río Magdalena, es considerada de muy alta prioridad para la investigación en el Plan de Acción Nacional para la Conservación y Manejo de Tiburones, Rayas y Quimeras de Colom...
Autor(es): Martha Patricia Ramirez. Sergio Antonio Lizcano Gutiérrez.
Reproductive phenology of snakes varies widely among species, likely influenced by biotic and abiotic factors related to seasonality. In Neotropical regions, where seasonal variation in temperature and photoperiod is minimal, the factors regulating the reproductive phenology of s...
Autor(es): Martha Patricia Ramirez. DANIELA GARCIA COBOS. ANDREW CRAWFORD.
An exceptional case of parallel evolution between lizards and eutherian mammals occurs in the evolution of viviparity. In the lizard genus Mabuya, viviparity provided the environment for the evolution of yolk-reduced eggs and obligate placentotrophy. One major event that favored ...
Autor(es): Martha Patricia Ramirez. Nathaly Herna?ndez-D?az. FRANCISCA LEAL CARVAJALINO.
We studied the reproductive phenology of five endemic Eleutherodactylus species that coexist in a mountain rainforest in Cuba and estimated their sex ratios at immature and mature stages. We tested the hypothesis that in Neotropical humid sites, reproductive activity in sympatric...
Autor(es): Martha Patricia Ramirez. GERMAN M. LOPEZ. IRELIS BIGNOTTE GIRO. ANSEL FONG.
The Carib Grackle (Quiscalus lugubris) has recently extended its distribution to montane habitats in the Colombian Andes, including urban areas. Little is known about its reproductive biology in both natural and urban environments. We analyzed the relationship between morphologic...
Autor(es): Martha Patricia Ramirez. Victor Hugo Serrano. YADI X. FIGUEROA. LUISA F. SAAVEDRA.
We studied the male reproductive tract of individuals of different body sizes of Caecilia thompsoni to describe morphological characteristics in comparison to other Gymnophiona. The reproductive tract consists of paired testes segmented into chains of primary and secondary lobes,...
Autor(es): Martha Patricia Ramirez. CARLOS ANDRES SERRANO PEREZ.
Estudiamos la fenología reproductiva en tres especies de Pristimantis que coexisten en un bosque de niebla tropical andino en la cordillera Oriental de Colombia. Las poblaciones estaban constituidas principalmente por juveniles, numerosos machos adultos, y pocas hembras adultas r...
Autor(es): Martha Patricia Ramirez. YAMILE GRANADOS PEREZ.
The neotropical genus Mabuya are obligate placentotrophic viviparous lizards, which have a short vitellogenesis that produces microlecithal oocytes and a prolonged time of gestation (9 to 10 months). The hormonal control of female reproductive activity during follicular growth an...
Autor(es): Martha Patricia Ramirez. HERIBERTO BARBOSA MORALES. SALOME RODRIGUEZ CHAPARRO. RODRIGO LUIS SILVA RIBEIRO SANTOS.
Pristimantis bacchus is an endangered terrestrial frog, endemic to cloud forests of the northern part of the Cordillera Oriental in the Colombian Andes. The knowledge of its reproductive biology and microhabitat use can offer important information for future conservation programs...
Autor(es): Wilfredo Chinchilla. Victor Hugo Serrano. Martha Patricia Ramirez.
The endocrinological study by immunological methods allows elucidating mechanisms of response to environmental challenges and reproductive regulatory mechanisms in animals. However, it is often overlooked that immunological assays for the detection and quantification of steroid h...
Autor(es): Martha Patricia Ramirez. HERIBERTO BARBOSA MORALES. RODRIGO LUIS SILVA RIBEIRO SANTOS.
Species of the genus Mabuya are barely recognizable because of their highly conservative external morphology, resulting in unstable systematic and taxonomic status. Considering that hemipenial morphology has been extensively used as a useful source of systematic information for s...
Autor(es): Martha Patricia Ramirez. Paola María Sánchez-Martínez. ELSON FERLEY MENESES PELAYO. PEDRO SALES NUNES.
Los anfibios, reptiles y mamíferos del Área de In?uencia del Proyecto Hidroeléctrico Sogamoso, es el resultado de los estudios de línea base realizados desde el año 2009 en las diferentes formaciones vegetales existentes en la cuenca del río Sogamoso, y constituye una contribució...
Autor(es): Martha Patricia Ramirez. Victor Hugo Serrano. Jesús Eduardo Ortega Chinchilla. Raúl Andrés Rodríguez Moreno.