Effects on cover, abundance and development of early stages of brown seaweed Lessonia spicata exposed to contaminated coastal waters of central Chile
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Fecha
2018
Profesor/a Guía
Facultad/escuela
Idioma
en
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Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
Population of Lessonia spicata are important community structures of the low intertidal
coastals of central-south of Chile. L. spicata is sensitive to high concentrations of copper
where have been described cell damaged, growth reduction and decrease on spore’s release.
Because of its life cycle and ecological importance, this species was selected to determine the
effects of seawater and sediments from Cachagua, Horcon y Ventanas- coastal sites near of
the industrial park of Quintero (V Region)- on population structure by means of
morphological characters and development. The population descriptors were cover and
morphological features, and development was registered to sporophyte formation. The results
show significative differences between populations from the different sites at morphological
level, with Ventanas with small plants. Also it was found high concentrations of copper and
arsenic in all the samples sites suggesting that the pollution levels has expanded since 2000 in
the bays of Valparaiso Region. In the case of in vitro experiments, differences in the
development of gametophytes and sporophytes were observed, where in both cases Ventanas
takes more time to develop a similar percentage of the same stage respect to Cachagua. It
would be interesting to assess if there are molecular or new mechanism of tolerance to pollution stressors in these populations, and if that also allows them to reproduce effectively
on sites constantly exposed to anthropogenic pollution.
Notas
Tesis (Biólogo Marino)
Palabras clave
Contaminación Marina