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La asimilación de elementos ingeridos por los copépodos marinos
Science (New York, N.Y.)
|February 15, 1991
Resumen
Los copépodos marinos asimilan eficientemente los elementos de las diatomeas, con una eficiencia vinculada al contenido citoplasmático. Esto sugiere una estrategia digestiva optimizada para los nutrientes solubles, impactando el ciclo de los elementos en los océanos.
Área de la Ciencia:
- Biología marina Biología marina.
- Oceanografía La oceanografía es la oceanografía.
- La nutrición del zooplancton es muy importante.
Sus antecedentes:
- Los copépodos calanoides marinos son el zooplancton clave en las redes alimentarias oceánicas.
- Comprender la asimilación de elementos en copépodos es crucial para los ciclos biogeoquímicos marinos.
- Los diatomeas son una fuente de alimento primaria para muchos herbívoros marinos.
Objetivo del estudio:
- Para cuantificar las eficiencias de asimilación de varios elementos ingeridos en los copépodos calanoides marinos.
- Investigar la relación entre la composición celular de las diatomeas y la asimilación de los elementos.
- Comprender las implicaciones de las estrategias de alimentación de copépodos en el reciclaje de elementos en los ecosistemas marinos.
Principales métodos:
- Alimentación de los copépodos calanoides marinos con diatomeas uniformemente radiomarcadas.
- Medición de las eficiencias de asimilación de los elementos (Ag, Am, C, Cd, P, S, Se, Zn).
- Correlación de las eficiencias de asimilación con el contenido citoplasmático de diatomeas y la edad del cultivo.
Principales resultados:
- Las eficiencias de asimilación variaron ampliamente, desde el 0,9% (Am) hasta el 97,1% (Se).
- Las mayores eficiencias de asimilación se correlacionan con un mayor contenido citoplasmático en las diatomeas.
- El zooplancton asimiló los elementos solubles de manera más eficiente, lo que indica una estrategia digestiva para los materiales solubles.
Conclusiones:
- Los copépodos marinos poseen una estrategia digestiva que favorece los elementos solubles, principalmente del citoplasma de las diatomeas.
- La asimilación de elementos por los copépodos está influenciada por la edad y la composición de las células de diatomeas.
- La asimilación eficiente de los elementos ligados al citoplasma contribuye a su reciclaje en las aguas superficiales.
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