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Levels of organochlorine compounds in eggs of gull-billed terns and assessment of eggshell pigments as potential biomarkers

AutorPérez de Vargas, Ana; Camarero, Pablo R. ; Mateo, Rafael
Fecha de publicación2014
CitaciónSETAC Europe 24th Annual Meeting (2014)
ResumenGull-billed tern (Gelochelidon nilotica) can be exposed to persistent organic pollutants in the breeding grounds in Europe, but also in the wintering quarters in Africa. This tern species is particularly different to the rest of terns because it uses more terrestrial habitats and feeds mostly on terrestrial insects. The levels of organochlorine pesticides and polychlorinated biphenyls (PCBs) were determined by GC-ECD in 97 eggs of gull-billed terns collected after the abandonment of a colony in the Marshes of Mesas de Asta (Cadiz, S Spain). The main objective of this work was to determine the relationships between the levels organochlorine compounds in the egg content and the embryo development, egg biometrics and eggshell pigmentation. Porphyrins and biliverdin were measured in eggshells by HPLC-UV-Vis and its use as potential biomarkers of the exposure to organochlorine contaminants was discussed. Most of the eggs (77%) were embryonated and the embryonic stage was positively correlated with the weight of the content (r=0.272, p=0.007) and negatively with the shell index (r=-0.515, p<0.001). The most abundant organochlorine was p,p'-DDE (11 μg/g lipid weight, l.w.; 3.8 μg/g wet weight), with comparatively higher concentrations that other populations of gull-billed terns or other terns species in Spain. Also relevant, but at much lower levels, were the concentrations of ΣPCBs (1.3 μg/g l.w.). ΣCyclodienes levels were significantly higher in embryonated (0.05 μg/g l.w.) than in non-embryonated eggs (0.03 μg/g l.w.; p=0.012), and this trend was also observed for other organochlorines detected in these samples and for the calculations made for the egg burden (all p≤0.013). The primary pigment in the eggshell was protoporphyrin IX (a precursor of heme group), followed biliverdin (a breakdown product of heme group). The concentrations of both pigments were highly correlated (r=0.901, p< 0.001). It has also been observed that biliverdin was in greater concentration in the eggshells of embryonated eggs (p=0.045). Moreover, biliverdin level in the eggshell was negatively correlated with the concentration of p, p' -DDE in the content, even if we consider the effect the embryo development in the analysis (p=0.023). This result indicates that the concentration of biliverdin in eggshell could be used as a non-invasive effect biomarker of organochlorine contaminants.
DescripciónResumen del trabajo presentado al Society of Environmental Toxicology and Chemistry Europe 24th Annual Meeting, celebrado en Basel (Suiza) del 11 al 15 de mayo de 2014.
Aparece en las colecciones: (IREC) Comunicaciones congresos
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