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Bifeniles policlorados: transferencia de micropartículas al fitoplancton marino y los efectos en la fotosíntesis
Science (New York, N.Y.)
|December 15, 1978
Resumen
Las diatomeas marinas absorben rápidamente los bifenilos policlorados (PCB) asociados a los microplásticos. Estos PCB absorbidos se dirigen a la maquinaria fotosintética, impactando las funciones celulares en cuestión de horas.
Área de la Ciencia:
- Biología Marina Biología Marina.
- Química del medio ambiente Química del medio ambiente
- Ecotoxicología Ecotoxicología.
Sus antecedentes:
- Los bifenilos policlorados (PCB) son contaminantes orgánicos persistentes que se encuentran en los entornos marinos.
- Los microplásticos pueden actuar como vectores para el transporte de contaminantes hidrofóbicos como los PCB.
Objetivo del estudio:
- Para investigar la absorción de PCB asociados con microplásticos por las diatomeas marinas.
- Para determinar la cinética de la incorporación de PCB en las células de diatomeas.
- Para evaluar el impacto de los PCB en la actividad fotosintética de las diatomeas.
Principales métodos:
- Exposición de las diatomeas marinas a los PCB adsorbidos en las micropartículas.
- Monitoreo de la transferencia de PCB a las células de diatomeas con el tiempo.
- La clorofila in vivo en un ensayo de fluorescencia para medir la eficiencia fotosintética.
Principales resultados:
- Se observó una rápida incorporación de PCB en las células de diatomeas marinas.
- El equilibrio de la transferencia de PCB se alcanzó en varias horas.
- Los PCB se localizaron en la maquinaria fotosintética, afectando los sitios sensibles.
Conclusiones:
- Las diatomeas marinas incorporan eficientemente los PCB unidos a los microplásticos.
- La rápida absorción y la orientación de los sitios fotosintéticos por los PCBs representan un riesgo ecotoxicológico significativo para los productores primarios marinos.
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