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Cambios fisiológicos y bioquímicos durante el desarrollo temprano de Lithodes santolla (Molina, 1782) (Decapoda: Lithodidae) y Petrolisthes laevigatus (Guérin, 1835) (Decapoda: Porcellanidae): una comparación dentro del infraorden Anomura

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Author
Surot Navarro, E.A.
Date
2006

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Abstract
El desarrollo embrionario y larval corresponden a fases importantes dentro del ciclo de vida de invertebrados marinos. Estudios relacionados al desarrollo embrionario de crustáceos son escasos y se enfocan principalmente en fecundidad, volumen y rendimiento reproductivo. La fisiología y bioquímica larval se ha estudiado con un poco más de detalle, aunque, el conocimiento de estas fases aún es escaso. El presente estudio analiza el desarrollo temprano de Lithodes santolla (Molina, 1782) y Petrolisthes laevigatus (Guérin, 1835) en términos de la fisiología y bioquímica durante el desarrollo, comparando ambas especies respecto al modo de desarrollo presente, planctotrofía (P. laevigatus) y lecitotrofía (L. santolla). Durante el desarrollo temprano se presentan diferencias en la fisiología y bioquímica entre L. santolla y P. laevigatus. Se observan variaciones fisiológicas y bioquímicas de los primeros días larvales de P. laevigatus respecto al suministro de alimento. Las diferencias observadas entre ambos modos de desarrollo analizados estarían dadas por la disponibilidad de energía que los individuos presentan al momento de la eclosión. Asimismo, períodos prolongados de ayuno producirían daños serios en individuos planctotróficos. Las mayores tasas fisiológicas encontradas para el desarrollo planctotrófico de P. laevigatus indicarían un metabolismo más activo en comparación al desarrollo lecitotrófico de L. santolla. Sin embargo las menores tasas fisiológicas observadas para L. santolla podrían corresponder a un mecanismo de ahorro de energía. Los resultados sugieren que la disponibilidad de energía que presente un individuo en términos de planctotrofía o lecitotrofía determina las respuestas fisiológicas durante el desarrollo embrionario y larval.
The embryonic and larval development are important stages in the cycle of life of marine invertebrates. There aren’t many studies about the early embryonic development of crustaceans and if any they are focused mainly fecundity, egg volume and reproductive output. There are some more studies about the larval biochemistry and physiology but the knowledge about these stages is still rare. The present research analyzes further about the development of Lithodes santolla (Molina, 1782) and Petrolisthes laevigatus (Guérin, 1835). This paper regards to the physiology and biochemistry of the development mode shown in both species, plankthotrophy on the one hand and lecitotrophy on the other hand. Noticeable differences can be observed in relation to the physiological and biochemical aspects in both species during the early larval stage of P. laevigatus, these differences are given by food supplies. According to the observations made it can be concluded that each sample analyzed is influenced by the amount of energy they have specially at the hatching period. Therefore it can also be said that plankthotrophic individuals would be seriously affected if they are left out under long periods of starvation. There are greater physiological rates for plankthotrophic development rather than lecitotrophy. This would indicate a more active metabolism for P. laevigatus against L. santolla. The minor rates observed for L. santolla could be considered a sort of mechanism to save energy. On the basis of the data observed it could be suggested that the amount of energy each individual has. In terms its plankthotrophy or lecitotrophy determines the physiological answers that individual has during the embryonic and larval stages.
Resource/Dataset Location
http://cybertesis.uach.cl/tesis/uach/2006/fcs961c/doc/fcs961c.pdf
URI
http://hdl.handle.net/1834/4918
Collections
1. Tesis de pregrado Biología Marina (UACh)

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