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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Video Experimental Relacionado

Updated: Oct 30, 2025

Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
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El sumidero de plástico desaparecido del océano: desaparecido con los ríos

Lisa Weiss1, Wolfgang Ludwig2, Serge Heussner2

  • 1CEFREM, UMR 5110 University of Perpignan-CNRS, F-66860 Perpignan Cedex, France. lisa.weiss@univ-perp.fr.

Science (New York, N.Y.)
|July 2, 2021
PubMed
Resumen

Las estimaciones de contaminación por plástico en los ríos están sobreestimadas. El nuevo análisis muestra que el flujo de microplásticos es mucho menor, aumentando su tiempo de residencia en la superficie del océano y reduciendo la necesidad de un sumidero de plástico que falta.

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Área de la Ciencia:

  • Ciencias del medio ambiente
  • La oceanografía
  • Estudios de la contaminación

Sus antecedentes:

  • Millones de toneladas de plástico entran en los océanos anualmente a través de los ríos, sin embargo, las cantidades de plástico en la superficie son mucho menores.
  • Este desequilibrio sugiere que falta un sumidero responsable de la rápida eliminación de plástico de la superficie del océano.

Objetivo del estudio:

  • Reevaluar las evaluaciones del flujo de plástico fluvial utilizando datos actualizados.
  • Para determinar el tiempo de residencia real de los microplásticos en la superficie del océano.

Principales métodos:

  • Reanálisis estadístico de los datos actualizados sobre los microplásticos.
  • Comparación de técnicas de muestreo de océanos y ríos para los microplásticos.

Principales resultados:

  • Las evaluaciones del flujo fluvial para los microplásticos se sobreestiman entre 100 y 1000 veces.
  • El tiempo estimado de permanencia de los microplásticos en la superficie del océano aumenta de días a años.

Conclusiones:

  • La necesidad teórica de un fregadero de plástico faltante se reduce significativamente.
  • Los modelos actuales de contaminación por microplásticos requieren una revisión basada en datos de flujo más precisos.