Influence of persistent organic pollutants on the endocrine stress response in free-living and captive red kites (Milvus milvus)

Influence of persistent organic pollutants on the endocrine stress response in free-living and captive red kites (Milvus milvus)
10 junio, 2018 FAB

Adjuntamos el resumen del artículo publicado por Laura Monclús en la revista científica Environmental Pollution, sobre cómo influyen los contaminantes orgánicos persistentes (COP) en los milanos reales (Milvus milvus), analizando para ello, las plumas de la especie.

Para este estudio científico se ha contado con la colaboración del Fondo Amigos del Buitre y del Grupo Ornitológico SEO-Monticola para la obtención de muestras de los milanos reales en Binaced, así como del Centro de Recuperación de Fauna Silvestre La Alfranca en Zaragoza para el muestreo de los ejemplares nacidos en cautividad.

El punto de alimentación de las Pichillas que gestiona el FAB en Binaced fue el área elegida para el trabajo de campo, ya que constituye una de las principales zonas de invernada de milano real en España.

Los COP son sustancias químicas sumamente tóxicas y perdurables que tienen el potencial de alterar la regulación endocrina de los organismos y alterar su capacidad para responder a los cambios ambientales.

Influence of persistent organic pollutants on the endocrine stress response in free-living and captive red kites (Milvus milvus)

Abstract

Persistent organic pollutants (POPs) have the potential to impair the endocrine regulation of organisms and alter their ability to respond to environmental changes. We studied whether polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) affected the endocrine regulation of free-living and captive red kites (Milvus milvus) through studying the dynamics of corticosterone (CORT) and dehydroepiandrosterone (DHEA). We sampled migratory free-living kites coming from northern Europe and captive kites born in a rehabilitation center in Spain. We used body feathers from the interscapular region as a minimally-invasive and integrative matrix. The most abundant compound detected in free-living kites was 4,4′-dichlorodiphenyldichloroethylene (4,4′-DDE; 6.10 ± 1.56ng g−1 dw feather) followed by CB-153 (3.10 ± 0.63ng g−1 dw feather) and CB-180 (2.43 ± 1.08ng g−1 dw feather). In captive kites, the most abundant compounds were 4,4′-dichlorodyphenyltrichloroethane (4,4′-DDT; 2.38 ± 1.30ng g−1 dw feather), CB-153 (2.15 ± 0.47ng g−1 dw feather) and hexachlorobenzene (HCB; 2.03 ± 0.45ng g−1 dw feather) at similar concentrations. Free-living kites showed higher levels of 4,4′-DDE and CB-180 in comparison to captive kites. Age influenced HCB and CB-101 levels, whereas body mass was inversely related to CB-180 and 4,4′-DDT. Interestingly, captive kites showed a ratio DDT/DDE higher than 1 suggesting a relatively recent exposure of DDT, in contrast to free-living kites. Regarding hormonal levels, free-living kites showed higher levels of CORT (3.30 ± 0.22pgmm−1 feather) than captive (2.40 ± 0.16pgmm−1 feather), reflecting higher allostatic load. In addition, a positive association between PCBs and DDTs and adrenal hormones was found in free-living kites, suggesting an increase of CORT as a response of the endocrine system to cope with stressors and a subsequent elevation of DHEA to ameliorate the potential negative effects that high CORT levels could cause to the organism.

Laura Monclúsa,*, Rubén Ballesteros-Canob, Javier De La Puentec, Silvia Lacorteb, , Manel López-Bejara

  • [a] Department of Animal Health and Anatomy, Veterinary Faculty, Universitat Autónoma de Barcelona, 08193, Bellaterra, Spain
  • [b] Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18, 08034, Barcelona, Spain
  • [c] SEO-Montícola Ornithological Group, Unidad de Zoología, Edificio de Biología, Universidad Autónoma de Madrid, 28049, Madrid, Spain

Link

sciencedirect.com Article Environmental Pollution

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