INVESTIGADORES
CHIODI BOUDET Leila Natalia
congresos y reuniones científicas
Título:
Oxidative stress: biomarker of effects and exposure in two sympatric otariids with contrasting population trends.
Autor/es:
GERPE, M.; POLIZZI, P.; ROMERO, M.B.; CHIODI BOUDET, L.; PONCE DE LEON, A.; RODRÍGUEZ, D.
Lugar:
Liege
Reunión:
Workshop; 28TH CONFERENCE OF THE EUROPEAN CETACEAN SOCIETY Liège, Belgium; 2014
Resumen:
Marine mammals
are top predators of trophic web and may be exposed to different types of
environmental stressors; chemical (heavy metals, persistent organic compounds)
and biological-ecological (qualitative quantitative prey depletion, niche
overlapping). Individually or in groups cause stress, which can be assessed by
biomarkers. Sea lions one and two hairs (Otaria flavescens and Arctocephalus
australis ) South Americans are dominant top predators of northern Argentina ,
Uruguay and southern Brazil and its population scenarios are contrasting , with
a marked decline and a sustained increase O.flavescens of A.australis . So far
not studied the possibility of some kind of environmental stress , with the
objective of this project to assess the ecotoxicological and environmental
status of both species from the study of biomarkers in blood , complemented by
the comparison of veterinary clinical parameters and foraging strategies .
Determination of heavy metals with physiological functions (zinc and copper) and
those without ( cadmium and total mercury ) , and essential non-metals
(selenium ) levels of both species is proposed , as well as analyze the mercury
- selenium relationship as detoxification mechanism . In addition the biomarker
study environmental stress is proposed in different blood fractions, such as
levels of metallothionein ( MT ) , oxidative effects by analyzing lipid
oxidation (LPO ) and protein (OP ) , activity of enzymes of the antioxidant
system ( superoxide dismutase ( SOD) , catalase (CAT ) , glutathione peroxidase
(GPX ) and glutathione- s - transferase (GST ) ) , and its relation to
serological and haematological parameters. These measurements were performed on
individuals of which their movements are recorded by satellite telemetry in open
sea and oxygen consumption at rest is analyzed by open flow respirometry . Thus
it is expected to have an overview of the relationship between stress levels
and different strategies for obtaining energy, and its association with
potential opposing population trends. It is hoped that the knowledge of the
stress state of these species multiparameter relevant as a diagnostic tool and
a future for the interpretation and the establishment of their conservation
status .