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Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea
Published on: September 5, 2018
La eutrofización, la pesca y la dinámica de los recursos de consumo en los ecosistemas marinos pelágicos
1National Center for Ecological Analysis and Synthesis, Santa Barbara, CA 93101, USA.
Science (New York, N.Y.)
|August 28, 1999
Resumen
El enriquecimiento de nutrientes aumenta el fitoplancton, mientras que la pesca reduce los herbívoros en los ecosistemas marinos. Sin embargo, estos efectos debilitan la red alimentaria, mostrando patrones generales de cambio a pesar de la variabilidad.
Área de la Ciencia:
- Ecología marina Ecología marina.
- La Dinámica de los Ecosistemas
- La estructura de la red alimentaria La estructura de la red alimentaria
Sus antecedentes:
- Los ecosistemas marinos se enfrentan a cambios globales por actividades humanas como la contaminación de nutrientes y la pesca.
- Estas actividades alteran significativamente la disponibilidad de recursos y la estructura de las redes alimenticias marinas.
Objetivo del estudio:
- Investigar los impactos generalizados del enriquecimiento de nutrientes y la presión del consumidor en los ecosistemas marinos.
- Analizar cómo estos factores influyen en la estructura de la red alimentaria y la dinámica de la comunidad a nivel mundial.
Principales métodos:
- Realizó metanálisis de 47 experimentos de mesocosmos marinos que manipularon nutrientes y consumidores.
- Se analizaron datos de series temporales de 20 sistemas marinos naturales, incluidos nutrientes, plancton y poblaciones de peces.
Principales resultados:
- El enriquecimiento de nutrientes generalmente aumenta la biomasa del fitoplancton.
- La presencia de carnívoros suele disminuir la biomasa de los herbívoros.
- Se observó una atenuación de los efectos tanto de los recursos como de los consumidores a través de las redes alimenticias pelágicas, lo que indica un débil acoplamiento fitoplancton-herbívoro.
Conclusiones:
- A pesar de la significativa variabilidad ambiental, las alteraciones inducidas por el hombre en la disponibilidad de recursos y las poblaciones de consumidores conducen a cambios predecibles a nivel comunitario en los ecosistemas marinos pelágicos.
- Comprender estos patrones generales es crucial para la conservación y gestión marina.
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