Influencia de factores ambientales en la dinámica de crustáceos macrobentónicos en fondos fangosos de la plataforma continental del Delta del Ebro (Mediterráneo noroccidental)
DOI:
https://doi.org/10.3989/scimar.2011.75n4691Palabras clave:
Peracarida, bentos, variabilidad espacial, sedimento fangoso, temperatura, agregados mucilaginososResumen
Evaluamos la variabilidad temporal de la comunidad de crustáceos endobentónicos frente a la variabilidad ambiental a pequeña escala. El estudio se sitúa en la plataforma continental frente a la desembocadura del Rio Ebro, en dos estaciones de muestreo a 45 y 60 m de profundidad. Las diferencias en la abundancia relativa de crustáceos entre las dos estaciones pueden estar relacionadas con la distancia a la desembocadura del Ebro, con un mayor aporte de materia orgánica y mayor contenido de fango cerca del rio. Observamos una variabilidad estacional relacionada con la alta producción de fitoplancton en primavera, con aportes de materia orgánica al bentos favoreciendo una mayor abundancia de crustáceos. Al final del verano se establece la termoclina, pudiendo limitar el aporte de materia orgánica al bentos, y junto con las altas temperaturas, que originaron acumulaciones de exudados de fitoplancton en el fondo, pudo causar una reducción en la abundancia y riqueza específica. La variabilidad estacional no es tan marcada en la estación de muestreo a 45 m. Esta zona está impactada por la pesca de arrastre, que probablemente enmascara la variabilidad temporal.
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