Xenopus laevis como bioindicador de exposición a disruptores endocrinos en la región de Chile central
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2017
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en
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Universidad Andrés Bello
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Licencia CC
Resumen
Concentrations of contaminants that act as endocrine disruptors (e.g. persistent organic
compounds, heavy metals among others) are quantified in sediments, water and animal
tissue in Chile. This type of compounds lead to reproductive, thyroid or adrenal failure in
vertebrates, wich may in the future contribute to population decline. Finding those
chemicals in different compartments of the environment suggests persistence, involuntary
release or clandestine use of such substances, which have a potential risk for the
conservation of the aquatic habitats in the mediterranean hotspot in central Chile. The
results of this study revealed that the effects that those pollutants have on organismas have
been less accessed in South American countries, being the reproductive topic mostly
studied. In addition, in this study, the introduced species, Xenopus laevis (African clawed
frog), revealed biological alterations, such as vitellogenin induction and decreased
testosterone in male frogs, gross body index and histological changes that could be linked
to pollutantas that act as endocrine disruptors present in the environment. Also estrogenic
and dioxine like activity have ben accesed in sediments where the frogs were captured and
related to some alterations observed in Xenopus laevis. Finally, AIC models were used with
data from coverage and land use around the water bodies to reveal which of these models
explain better the different variations found in the African clawed frog. In this study an
invasive frog was evaluated, however different endemic species of these aquatic
ecosystems may be facing a similar effect. This is relevant for the ecosystem in general,
because it can indicate the ecosystem’s health where these animals live, also the potentially
impact on wild species and human populations. This will be an important tool for future conservation strategies, identify vulnerable ecosystems from pollution and predict changes
that may occur in the aquatic habitats in the mediterranean hotspot in central Chile.
Notas
Tesis (Doctor en Medicina de la Conservación)
This research project was conducted in accordance with Chilean law under permits N°1545/2014, N°7545/2014, N°8550/2014 of the Servicio Agrícola y Ganadero de Chile, and N°005/2014 of the Corporación Nacional Forestal de Chile.
Financial support was given by Universidad Andrés Bello Introduction to Research grant No. DI-592-14/I.
This research project was conducted in accordance with Chilean law under permits N°1545/2014, N°7545/2014, N°8550/2014 of the Servicio Agrícola y Ganadero de Chile, and N°005/2014 of the Corporación Nacional Forestal de Chile.
Financial support was given by Universidad Andrés Bello Introduction to Research grant No. DI-592-14/I.
Palabras clave
Xenopus Laevis, Disruptores Endocrinos, Chile