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Floración de fitoplancton producida por un borde de hielo en retroceso en el mar de Ross: coherencia espacial con el
Science (New York, N.Y.)
|January 11, 1985
Resumen
Se encontró una densa floración de fitoplancton cerca de los bordes de hielo de la Antártida, que prospera en aguas de baja salinidad. Esta floración, impulsada por el derretimiento del hielo y una mayor estabilidad, mostró altas concentraciones de sílice biogénica.
Área de la Ciencia:
- Biología marina Biología marina.
- Oceanografía La oceanografía es la oceanografía.
- La investigación en la Antártida es una investigación antártica.
Sus antecedentes:
- El retroceso de los bordes de hielo en la Antártida crea entornos marinos únicos.
- El derretimiento del hielo conduce a una reducción de la salinidad y a una mayor estabilidad vertical en las aguas superficiales.
- Las algas epónticas, liberadas del hielo derretido, pueden actuar como un inoculo biológico.
Objetivo del estudio:
- Para investigar la ocurrencia y las características de las floraciones de fitoplancton cerca de un borde de hielo en retroceso.
- Comprender los factores ambientales que influyen en la formación y composición de la floración.
- Para analizar las concentraciones de clorofila, carbono particulado y sílice biogénica.
Principales métodos:
- Medidas de clorofila, carbono particulado y sílice biogénica.
- Análisis de la salinidad del agua y la estabilidad vertical.
- Cartografía espacial de la extensión de la floración en relación con el borde del hielo y los gradientes de salinidad.
Principales resultados:
- Se identificó una densa floración de fitoplancton que se extendía 250 km desde el borde del hielo.
- La floración se limitó a áreas de salinidad reducida causada por el derretimiento del hielo.
- Se observaron proporciones inusualmente altas de carbono orgánico a clorofila y sílice biogénica a carbono.
- Las altas concentraciones de sílice biogénica estaban presentes a pesar de los niveles moderados de clorofila.
Conclusiones:
- La reducción de la salinidad y la mayor estabilidad vertical cerca de los bordes de hielo que retroceden favorecen la floración del fitoplancton.
- El hielo derretido puede proporcionar un inóculo esencial para iniciar estas floraciones.
- La composición de la floración se caracterizó por un alto contenido de sílice biogénica, lo que indica comunidades específicas de fitoplancton o estados fisiológicos.
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