Reproducción de la rana Hyla labialis Reproducción del rana Hvla labialis
<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ">1. Se estudió la ovogénesis en la Hyla labialis para compararla con el mismo proceso e...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Universidad Nacional de Colombia
1962-11-01
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| Series: | Caldasia |
| Subjects: | |
| Online Access: | http://www.revistas.unal.edu.co/index.php/cal/article/view/33090 |
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| Summary: | <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ">1. Se estudió la ovogénesis en la Hyla labialis para compararla con el mismo proceso en las ranas que viven en países con estaciones climatéricas definidas. Por inyección de glándula pituitaria se pueden obtener huevos fertilizados durante los meses de octubre a junio, y rara vez en los otros meses.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ">2. Se midieron y se contaron ovocitos enteros en muestras de ovarios maduros, inmaduros y después de la ovulación, Hay ovocitos de todos los tamaños presentes en los ovarios maduros; en los ovarios no maduros, y después de la ovulación hay células de todos los tamaños hasta 1.200 mm. de diámetro.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ">3. En secciones de ovarios se midió el diámetro de las células y de los núcleos y plaquetas vitelinas. Se estudiaron los cambios citológicos de los núcleos y también del citoplasma. Las plaquetas vitelinas aparecen en células que tienen un diámetro de 0.350 a 0.400 mm, La melanina aparece en ovocitos que tienen 0.700 mm. o más de diámetro. En general, los cambios citológicos son muy semejantes a los descritos por otros investigadores en otras especies.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ">4. La diferencia más obvia e interesante entre la ovogénesis de la Hyla Iabialis y la de otras especies descritas es la presencia de ovocitos de todos los tamaños y en cantidades grandes en el ovario inmediatamente después de la ovulación. Se piensa que los resultados demuestran que el proceso de ovogénesis sigue durante todos los meses sin detenerse como</span><span style="font-size: 12.0pt; font-family: "> se hace en países con estaciones climatéricas definidas.</span></p> <br> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-language: ES;">1. Oögenesis of the frog, Hyla labialis has been studied in order to Compare it with the same process in frogs which live in countries with definite climatic seasons. Fertilized eggs can be obtained after pituitary injection during the months of October through June and occasionally during the rest of the year.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-language: ES;">2. Whole oöcytes were measured and counted in samples taken from mature ovaries, immature ovaries and ovaries after ovulation had taken place. </span><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-language: ES;">There are oöcytes of all sizes present in mature ovaries; in immature ovaries and ovaries after ovulation there are cells of all sizes up to 1.200 mm. diameter.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-language: ES;">3. In sections of ovaries, the diameter of the cells, of the nuclei and of the yolk platelets was measured. The cytological changes in the nuclei and cytoplasm were studied. Yolk platelets first appear in cells which have a diameter of 0.350 to 0.400 mm. Melanin is first found in cells of 0.700 mm. or more in diameter. In general, the cytological changes are similar to those described by other investigators for other species.</span></p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-language: ES;">4. The most obvious and interesting difference between oögenesis in Hvla labialis and other species previously studied is the presence of oöcytes of all sizes and in large quantities in the ovaries studied immediately after ovulation occured. </span><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-ansi-language: EN-US; mso-fareast-language: ES;" lang="EN-US">The results reported in this paper suggest that oögenesis is a continuous process throughout the entire year here in Bogotá, Colombia. In this respect it differs from that described for amphibians which live in countries with definite climatic seasons in which the growth of oöcytes is a discontinuous process and takes place</span><span style="font-size: 12.0pt; font-family: ";Arial";,";sans-serif";; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-fareast-language: ES; mso-bidi-language: AR-SA;" lang="EN-US"> in distinct groups of cells developing simultaneously.</span></p> |
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| ISSN: | 0366-5232 |