Martha Patricia Ramirez Pinilla

Martha Patricia Ramirez Pinilla
Industrial University of Santander | UIS · School of Biology

Doctor en Ciencias Biológicas orientación Zoología

About

144
Publications
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Introduction
Martha Patricia Ramirez Pinilla currently works at the School of Biology, Industrial University of Santander. Martha Patricia does research in Reproductive Biology, Anatomy, Cell Biology and Developmental Biology.

Publications

Publications (144)
Article
Potamotrygon magdalenae is a stingray belonging to the family Potamotrygonidae distributed in the Magdalena River basin. This species is considered of high priority for research according to the National Plan of Action for the Conservation and Management of Sharks, Rays, and Chimaeras of Colombia. The studies of embryonic development in chondrichth...
Article
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 morphological and morphometric external characters with sex, reproductive conditi...
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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 species will vary in the time of occurrence so that there is no compl...
Article
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 snakes remain poorly known, despite the great diversity of species foun...
Article
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 the evolution of placentation was the reduction of the eggshell. As w...
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We studied the reproductive phenology of three coexisting Pristimantis species inhabiting an Andean tropical cloud forest in the Cordillera Oriental of Colombia. Populations were constituted mostly by juveniles, numerous adult males, and few reproductive adult females and, therefore, the operational sex ratio was greatly biased to males while the p...
Article
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, sperm ducts that empty to Wolffian ducts, the cloaca that receives th...
Article
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 and pregnancy has not been studied, although it is known that the corpus...
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RESUMEN. Estudiamos la actividad reproductiva y dinámica poblacional de Rhipidomys fulviventer en un bosque andino de roble en la Cordillera Oriental de Colombia. Se realizó un seguimiento poblacional mensual de octubre de 2014 a septiembre de 2015 y de septiembre de 2016 a enero de 2018, mediante capturas en cinco estaciones fijas en un intervalo...
Article
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 several groups of Squamata, we described the hemipenial morphology of n...
Article
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 hormones require prior validation tests. In this study, the efficacy of...
Article
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. We evaluated the reproductive activity and microhabitat use for both...
Article
The reproductive activity of most of tropical Andean snakes is unknown, especially for fossorial species. An undescribed species of Atractus from Cordillera Oriental of Colombia occupies a habitat that undergoes two rainy seasons and two dry seasons. This strongly seasonal climate suggests that the reproductive phenology of the species might be sea...
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Species traits provide a strong link between an organism's fitness and processes at community and ecosystem levels. However, such data remains scarce for amphibians in the neotropics. Colombia is the country with the highest number of threatened amphibians and the second greatest number of amphibian species worldwide. We present a data set containi...
Article
Composition and distribution of liverworts (Marchantiophyta) in a continuous altitudinal range on the Cordillera Oriental of Colombia. The species composition of liverworts varies with altitude in the Northern part of the Andes due to the relationship of biotic (vegetation) and abiotic factors (temperature, humidity , and sunlight brightness). In o...
Article
Habitat fragmentation, the transformation of interconnected large habitats into several small patches, is generally considered to have a negative influence on biodiversity. Management policies should therefore favour strategies that minimize fragmentation. We studied amphibian diversity and compositional patterns in a complex montane agroforestry m...
Article
In squamates, progesterone (P) plays a key role in the inhibition of uterine mobility during egg retention in oviparous species, and during gestation in viviparous species. The corpus luteum (CL) is the main organ responsible for the production of P; however, in some species, the CL degenerates early and the P needed for gestation maintenance shoul...
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Despite its success as an invasive species, little is known about the ecological aspects of the gekkonid lizard Hemidactylus frenatus in Colombia. In the present study the size at maturity, sexual dimorphism, reproductive activity, and diet composition of a population of this species in an urban locality of Northern Colombia were determined. We con...
Article
Syncytins are envelope genes from endogenous retroviruses that have been captured during evolution for a function in placentation. They have been found in all placental mammals in which they have been searched, including marsupials. Placental structures are not restricted to mammals but also emerged in some other vertebrates, most frequently in liz...
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Overuse of agrochemicals has become of increasing concern because they negatively affect many non-target organisms, particularly amphibians. In this chapter, we support the use of the direct-developing frog Eleutherodactylus johnstonei as an innovative and promising model organism in terrestrial ecotoxicology. Standard guidelines for collecting, ho...
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We report records of new localities and an update for the distribution of the Inger's Robber Frog, Strabomantis ingeri, a rare and vulnerable species from the Colombian Andean cloud forests. We report the first record of S. ingeri for the Boyacá department.
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We studied the annual reproductive activity of a population of Nephelomys meridensis in an Andean oak forest in the Cordillera Oriental of Colombia. Monthly during a year, Sherman live traps were established in 5 fixed stations (20 traps per station) during 4 nights per month, along an altitudinal range of 2530-2657 m. Reproductive condition was es...
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Reproductive biology of Artibeus lituratus and Artibeus jamaicensis in an urban area of Colombia. We investigated the annual reproductive activity of females of Artibeus lituratus and A. jamaicensis inhabiting an urban area and its relation with climate and dietary resources. The reproductive condition of each of 366 females captured during 2012 wa...
Article
Reptiles are one of the most diverse groups of vertebrates, providing an integrated system for comparative studies on metabolic, animal physiology, and developmental biology. However, the molecular data available are limited and only recently have started to call attention in the “omics” sciences. Mabuya sp. is a viviparous placentrotrophic skink w...
Article
Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal base of each clasper. They are par...
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The PREDICTS project—Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)—has collated from published studies a large, reasonably representative database of comparable samples of biodiversity from multiple sites that differ in the nature or intensity of human impacts relating to land use. We have used t...
Data
The PREDICTS project—Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)—has collated from published studies a large, reasonably representative database of comparable samples of biodiversity from multiple sites that differ in the nature or intensity of human impacts relating to land use. We have used t...
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Full-text available
AIM: Understanding the impact of land use change within assemblages is fundamental to mitigation policies at local and regional scale. Here, we aim to quantify how site-level terrestrial assemblages are responding to land use change in Colombia a mega-diverse country and to project future biodiversity under different scenarios of land use change as...
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Full-text available
Understanding the impact of land use change within assemblages is fundamental to mitigation policies at local and regional scale. Here, we aim to quantify how site-level terrestrial assemblages are responding to land use change in Colombia a mega-diverse country and to project future biodiversity under different scenarios of land use change associa...
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Full-text available
Understanding the phylogenetic and geographical history of Neotropical lineages requires having adequate geographic and taxonomic sampling across the region. However, Colombia has remained a geographical gap in many studies of Neotropical diversity. Here we present a study of Neotropical skinks of the genus Mabuya, reptiles that are difficult to id...
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Bachia bicolor is a small serpentiform lizard distributed from central to northern Colombia and western Venezuela; until now ecological and reproductive data are unknown for this species. We studied some ecological and reproductive aspects of a population of B. bicolor that inhabits urban areas from a Colombian city. Lizards are found in house gard...
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Full-text available
The PREDICTS project—Projecting Responses of Ecological Diversity In Changing Terrestrial Systems (www.predicts.org.uk)—has collated from published studies a large, reasonably representative database of comparable samples of biodiversity from multiple sites that differ in the nature or intensity of human impacts relating to land use. We have used t...
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Full-text available
Presento una revision de los trabajos que desde mi laboratorio se han venido realizando sobre la biologia reproductiva y la placentotrofia en varias poblaciones de lagartijas viviparas placentotroficas del genero Mabuya. En este grupo la ovogenesis produce huevos microlecitos y en relacion a ello se encuentra la mayor complejidad placentaria conoci...
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The purpose of this study was to describe the structure of the reproductive tract of males of Potamotrygon magdalenae before, during, and after they acquire sexual maturity, and to establish the first maturity scale for males within the family Potamotrygonidae. The male reproductive tract of P. magdalenae is composed of testes, efferent ducts, epid...
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Bolitoglossa cf. pandi is a terrestrial salamander that inhabits a fragment of secondary forest located in the Cordillera Oriental of the Colombian Andes. Few aspects of its biology are known. Here we studied its diet, microhabitat use, population structure, and arthropod richness at the study site during rainy and dry seasons. We also recorded per...
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Geobatrachus walkeri is a frog that belongs to a monotypic genus and is endemic to the Sierra Nevada de Santa Marta, Colombia. The species inhabits different microhabitats between 2 000 to 3 500m altitude, including the leaf litter of a pine plantation. To understand its reproductive ecology, we conducted eight frog samplings, covering the rainy an...
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Geobatrachus walkeri es una rana que pertenece a un género monotípico y es endémica de la Sierra Nevada de Santa Marta, Colombia. La especie habita en diferentes microhábitats entre los 2 000 y 3 500m de altitud, incluyendo la hojarasca de una plantación de pinos. Para entender su ecología reproductiva se realizaron ocho muestreos de individuos, qu...
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Chalcides viridanus is a small skink endemic to Tenerife, the Canary Islands. This paper describes its annual reproductive cycle and sexual dimorphism by use of data from external measurements, dissection, and histological observation of gonads from monthly samples. Males were significantly larger than females in head-forelimb length, distance betw...
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We evaluated patterns of site preference for oviposition in Espadarana andina based on the identification and characterization of microhabitats during rainy and dry seasons. We also evaluated the presence of males and females at oviposition sites and the proximity of the adults to the clutches. An electivity index was used to determine which microh...
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Over the last century, the morphogenesis of the vertebral column has been considered as a highly conserved process among anurans. This statement is based on the study of few metamorphic taxa, ignoring the role of developmental mechanisms underlying the evolution of specialized life-histories. Direct development in anurans has been regarded as evolu...
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The aerial spraying of glyphosate formulations in Colombia to eradicate illegal crops has generated great concern about its possible impact on nontarget organisms, particularly amphibians. This study evaluated the toxic, cytotoxic, and genotoxic effects of a glyphosate formulation (Roundup®SL-Cosmoflux®411F) in the direct-developing frog Eleutherod...
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In this study we describe for the first time aspects of the reproductive ecology and behavior of a population of Hyalinobatrachium aureoguttatum located in the Colombian Pacific lowlands. Males vocalize and attend clutches from the underside of leaves overhanging the streams. Males showed high fidelity to their territory; each male repeatedly uses...
Article
The study of cranial design and development in Gymnophthalmidae is important to understand the ontogenetic processes behind the morphological diversity of the group and to examine the possible effects of microhabitat use and other ecological parameters, as well as phylogenetic constraints, on skull anatomy. Complete morphological descriptions of em...
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Full-text available
In this study we describe for the first time aspects of the reproductive ecology and behavior of a population of Hyalinobatrachium aureoguttatum located in the Colombian Pacific lowlands. Males vocalize and attend clutches from the underside of leaves overhanging the streams. Males showed high fidelity to their territory; each male repeatedly uses...
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Full-text available
There have been relatively few attempts to quantitatively describe behaviours in scincid lizards. Chalcides viridanus is a small body-sized skink endemic of Tenerife (Canary Islands). We describe and quantify 18 behaviour patterns (both social and agonistic) of this species, some of which have not been described before for other scincids. Video rec...
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Resumen Las colecciones biológicas son depositarias del patrimonio biológico del país. Sin embargo, no siempre es fácil acceder a la información asociada a estas colecciones, por falta de recursos y tiempo para extraer los datos de las etiquetas de colecta o catálogos de los especímenes. Gracias a la cooperación entre el Instituto de Ciencias Natur...
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We used immunofluorescent confocal microscopy and scanning electron microscopy to quantify uterine vascularity and to describe uterine surface morphology during gestation in pregnant females of the lecithotrophic lizard Niveoscincus coventryi. As uterine angiogenesis and epithelial cell morphology are thought to be under progesterone control, we st...
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Workshops are an important part of the IFPA annual meeting as they allow for discussion of specialised topics. At IFPA meeting 2011 there were twelve themed workshops, five of which are summarized in this report. These workshops related to various aspects of placental biology: 1) immunology; 2) epigenetics; 3) comparative placentation; 4) trophobla...
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The aim of this study was to use the Comet assay to assess genetic damage in the direct-developing frog Eleutherodactylus johnstonei. A DNA diffusion assay was used to evaluate the effectiveness of alkaline, enzymatic and alkaline/enzymatic treatments for lysing E. johnstonei blood cells and to determine the amount of DNA strand breakage associated...
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Full-text available
La rana Geobatrachus walkeri pertenece a un género monotípico y endémico del área de San Lorenzo, Sierra Nevada de Santa Marta, Colombia. La especie habita en el bosque secundario natural y en una plantación de pino (dominada por Pinus patula). Para comparar la abundancia relativa y el uso del microhábitat en estos dos hábitat y durante los período...
Article
Male and female plethodontid salamanders have specialized cloacal glands associated with the reproductive activity. The reproductive cycle in Bolitoglossa nicefori is characterized by males that are potentially reproductive throughout the year, and females that are reproductive only for a few months. To determine whether morphological and histochem...
Book
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La Colección Herpetos de Colombia es una publicación realizada por la Asociación Colombiana de Herpetolgogía. En su primera entrega aparece con sus portadas en tapa dura, cinco separadores de sección y sus primeras fichas, consistentes en total en 26 páginas internas. La colección tiene una función científica, educativa y divulgativa, pues describe...
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Despite the attention squamate lizards have received in the study of digit and limb loss, little is known about limb morphogenesis in pentadactyl lizards. Recent developmental studies have provided a basis for understanding lizard autopodial element homology based on developmental and comparative anatomy. In addition, the composition and identity o...
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Webbed foot morphology is a highly homoplastic character in species of Bolitoglossa and has been assumed to be pedomorphic. This study examines the morphology and posthatching ontogeny of the autopodial skeleton of Bolitoglossa nicefori and compares the descriptive and morphometric results with other species of the genus. We show that the autopodia...
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Mabuya skinks have the most specialized allantoplacenta and the greatest degree of placentotrophy known among the Reptilia. Their recently ovulated eggs are microlecithal (1-2 mm) and lack fatty yolk platelets; thus, virtually all of the nutrients for embryonic development must pass across the placenta. We quantified the net uptake of nutrients dur...