Stressors affecting the macrobenthic community in Rapallo Harbour (Ligurian Sea, Italy)

Anabella Covazzi Harriague; Cristina Misic; Mario Petrillo; Giancarlo Albertelli

doi:10.3989/scimar.2007.71n4705

Autores/as

Anabella Covazzi Harriague DIP.TE.RIS. Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova
Cristina Misic DIP.TE.RIS. Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova
Mario Petrillo DIP.TE.RIS. Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova
Giancarlo Albertelli DIP.TE.RIS. Dipartimento per lo Studio del Territorio e delle sue Risorse, Università di Genova

DOI:

https://doi.org/10.3989/scimar.2007.71n4705

Palabras clave:

macrofauna, puerto, enriquecimiento orgánico, índices de stress, NO Mediterráneo

Resumen

Un muestreo se llevo a cabo durante un año en el puerto de Rapallo (Mar Ligure, NO Mediterráneo) para estudiar los factores principales que afectan a las comunidades macrobentónicas. El puerto presentó un notable enriquecimiento orgánico (entre 51.9 mg g^–1 y 109.6 mg g^–1), que no disminuyó la oxigenación del agua, y una baja pero detectable contaminación de metales pesados (en promedio Cu=135.0 ?g g^–1 y V=23.8 ?g g^–1). Las variaciones estacionales en la concentración de metales pesados sugirieron un aumento significativo de las actividades turísticas (i.e. movimiento de las embarcaciones) durante el verano y el otoño. En la parte interna, más protegida, las infraestructuras del puerto y el movimiento de los barcos incrementaron el enriquecimiento orgánico y la inestabilidad del sedimento, favoreciendo la dominancia en las comunidades macrobéntonicas de especies indicadoras asociadas a dichos factores de stress. Además, durante el verano y el otoño, no obstante el relevante flujo de clorofila-a, el material sedimentado estuvo dominado por feopigmentos y proteínas refractarias, reduciendo su valor trófico para los consumidores bentónicos. En la parte externa del puerto, el principal factor de stress fue el torrente, como lo confirmara la dominancia de especies indicadoras tales como Capitella spp. (en promedio 79.5%), Neanthes caudata, Malacoceros girardi y Diopatra neapolitana.

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