Genetic diversity between natural and cultivated populations of Argopecten purpuratus (Lamarck, 1819) (Bivalvia: Pectinidae) and the effect of their hybridization on the performance of productive traits and tolerance to abiotic stress in response to hypoxia and high temperature
The northern oyster, Argopecten purpuratus, is an economic resource that was intensively cultivated in Coquimbo (Tongoy Bay) 30 years ago without adequate genetic management with repercussions on size and survival. Presumably, this pattern is the result of a decrease in genetic diversity, and tolera...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Chile |
| OAI Identifier: | oai:repositorio.anid.cl:10533/220624 |
| Acceso en línea: | https://hdl.handle.net/10533/220624 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Naturales Otras Ciencias Naturales |
| Sumario: | The northern oyster, Argopecten purpuratus, is an economic resource that was intensively cultivated in Coquimbo (Tongoy Bay) 30 years ago without adequate genetic management with repercussions on size and survival. Presumably, this pattern is the result of a decrease in genetic diversity, and tolerance to environmental stress of the stock under cultivation. Here, this hypothesis is tested and it is evaluated whether the intraspecific hybridization with individuals from a natural bank (Arica) can improve the genetic variability of the crop stock and its performance in productive traits and tolerance to stress. By comparing 12 microsatellites between populations we see that both populations have high diversity, but with genetic differentiation (possible low gene flow). The comparison in common environment of sizes and performance between retro-crosses and hybrids shows that Coquimbo have larger sizes but that Arica is better prepared to tolerate high temperatures; however, both populations tolerate hypoxia. There is positive heterosis for growth and survival, since the hybrids have better performance than the average of the parents. Hybridization with Arica allows to improve the thermal tolerance of the stock under cultivation; in addition to the incorporation of new genetic material. Therefore, intraspecific hybridization is a genetic improvement tool for A. purpuratus. |
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