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Implicaciones demográficas del envenenamiento por plomo para las águilas en toda América del Norte
Vincent A Slabe1,2, James T Anderson3, Brian A Millsap4
1Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV, USA.
Science (New York, N.Y.)
|February 17, 2022
Resumen
El envenenamiento por plomo está muy extendido en las águilas calvas y doradas en toda América del Norte, afectando significativamente a sus poblaciones. Este estudio revela altas tasas de exposición y sus efectos perjudiciales en la supervivencia y el crecimiento de las águilas.
Área de la Ciencia:
- Ornitología
- Toxicología ambiental
- Ecología de la vida silvestre
Sus antecedentes:
- El envenenamiento por plomo es una amenaza global para las aves depredadoras.
- Los estudios previos sobre la exposición del águila al plomo se limitaron a datos regionales.
- Comprender los impactos en todo el continente es crucial para la conservación.
Objetivo del estudio:
- Para evaluar las frecuencias de exposición al plomo en águilas calvas y doradas a través de América del Norte.
- Determinar los efectos del envenenamiento por plomo en la población de estas especies.
- Identificar los factores que influyen en la exposición de las águilas al plomo.
Principales métodos:
- Análisis de la exposición al plomo en 1210 águilas calvas y doradas de 38 estados de EE.UU.
- Medición de la intoxicación crónica y aguda por plomo utilizando muestras de huesos, hígado, sangre y plumas.
- Modelado demográfico en todo el continente para estimar la supresión del crecimiento de la población.
Principales resultados:
- Se detectaron altas frecuencias de envenenamiento por plomo tanto crónico (46-47%) como agudo (27-35%).
- Las tasas de envenenamiento por plomo varían según la edad, la región y la temporada de las águilas calvas.
- Las tasas de crecimiento de la población se redujeron en un 3,8% para las águilas calvas y en un 0,8% para las águilas reales.
Conclusiones:
- El envenenamiento por plomo es una amenaza significativa y subestimada para las poblaciones de águilas de América del Norte.
- Las altas tasas de exposición tienen un impacto negativo en el rendimiento demográfico de las águilas calvas y doradas.
- Las estrategias de conservación deben abordar la exposición al plomo para proteger estas especies icónicas.
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