Desarrollo embrionario y larval de Smilisca phaeota (Cope, 1862), (Anura: Hylidae) en laboratorio
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Fecha
2002
Autores
Camacho Salazar, Rodolfo Esteban
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Universidad Nacional (Costa Rica)
Resumen
Bajo condiciones de laboratorio se estudió el desarrollo embrionario y larval de Smilica phaeota a partir de una postura de 1250 huevos, la cual se muestreó con una frecuencia según la aceleración de los cambios y la duración de cada etapa: huevo cada 12 horas, embrión cada 24 horas, larva (desde que inicia la aparición de sus extremidades hasta que pierde totalmente la cola) cada 24 horas, y juvenil solo una vez. Se determinó la longitud total, longitud de la cola, longitud del cuerpo así como el peso. Se realizó esquemas y una descripción de algunos de los estadios del desarrollo de embriones y larvas, empleando características morfofisiológicas determinables. Se presentó un incremento en el crecimiento en longitud total hasta el día 109 en el cual la larva alcanzó su mayor tamaño, para luego disminuir hasta el día 115 en que se obtuvo el estado juvenil. El peso se mantuvo constante, desde el día uno hasta el siete, aumentando gradualmente hasta alcanzar su máximo en el día 109, y luego empezó a decrecer bruscamente hasta estabilizarse de nuevo a los 114 y 115 días. La aparición y desarrollo de las extremidades posteriores inició en el día 97, mientras que la cola continuó creciendo hasta alcanzar su mayor tamaño el día 104, y luego disminuye hasta su reabsorción total el día 115. Desde el día 97 hasta el 115 el tamaño del cuerpo se mantuvo constante. La relación longitud-peso para el desarrollo embrionario y larval se rigió por la ecuación P=0.0104e0.1153Lt (r=0.85).
Under laboratory conditions, the embryonic and larval development of Smilica phaeota was studied from a position of 1250 eggs, which was sampled with a frequency according to the acceleration of the changes and the duration of each stage: egg every 12 hours, embryo every 24 hours, larvae (from the beginning of the appearance of its limbs until it completely loses its tail) every 24 hours, and juvenile only once. Total length, tail length, body length as well as weight were determined. Schemes and a description of some of the stages of embryo and larval development were made, using determinable morphophysiological characteristics. There was an increase in growth in total length until day 109 in which the larva reached its largest size, and then decreased until day 115 when the juvenile stage was obtained. The weight remained constant from day one to day seven, gradually increasing until it reached its maximum on day 109, and then it began to decrease sharply until it stabilized again at days 114 and 115. The appearance and development of the hind limbs began on day 97, while the tail continued to grow until it reached its greatest size on day 104, and then decreased until its total reabsorption on day 115. From day 97 to day 115 the size of the body remained constant. The length-weight relationship for embryonic and larval development was governed by the equation P = 0.0104e0.1153Lt (r = 0.85).
Under laboratory conditions, the embryonic and larval development of Smilica phaeota was studied from a position of 1250 eggs, which was sampled with a frequency according to the acceleration of the changes and the duration of each stage: egg every 12 hours, embryo every 24 hours, larvae (from the beginning of the appearance of its limbs until it completely loses its tail) every 24 hours, and juvenile only once. Total length, tail length, body length as well as weight were determined. Schemes and a description of some of the stages of embryo and larval development were made, using determinable morphophysiological characteristics. There was an increase in growth in total length until day 109 in which the larva reached its largest size, and then decreased until day 115 when the juvenile stage was obtained. The weight remained constant from day one to day seven, gradually increasing until it reached its maximum on day 109, and then it began to decrease sharply until it stabilized again at days 114 and 115. The appearance and development of the hind limbs began on day 97, while the tail continued to grow until it reached its greatest size on day 104, and then decreased until its total reabsorption on day 115. From day 97 to day 115 the size of the body remained constant. The length-weight relationship for embryonic and larval development was governed by the equation P = 0.0104e0.1153Lt (r = 0.85).
Descripción
Camacho Salazar, R. (2002). Desarrollo embrionario y larval de Smilisca phaeota (Cope, 1862), (Anura: Hylidae) en laboratorio. [Tesis de Licenciatura]. Universidad Nacional, Costa Rica.
Palabras clave
DESARROLLO EMBRIONARIO, EMBRYONIC DEVELOPMENT, LARVAS, RANA, FROG, SMILISCA PHAEOTA, ANURA