Heavy metals in crustaceans from the Iberian deep sea plain

Friederike Prowe; Mathias Kirf; Gerd-Peter Zauke

doi:10.3989/scimar.2006.70n2271

Autores/as

Friederike Prowe Carl von Ossietzky Universität Oldenburg, Institut für Chemie und Biologie des Meeres (ICBM)
Mathias Kirf Carl von Ossietzky Universität Oldenburg, Institut für Chemie und Biologie des Meeres (ICBM)
Gerd-Peter Zauke Carl von Ossietzky Universität Oldenburg, Institut für Chemie und Biologie des Meeres (ICBM)

DOI:

https://doi.org/10.3989/scimar.2006.70n2271

Palabras clave:

biomonitoreo, metales pesados, zooplankton anomalías de Cd, heterogeneidad interespecífica

Resumen

Se analizaron trazas de metales (Cd, Cu, Pb y Zn) en diferentes muestras de mezclas bien definidas de Copepoda y Euphausiacea así como en Decapoda, recolectadas en una campaña del crucero “RV Walther Herwig III” en la Llanura Abisal Ibérica durante los meses de marzo y abril del 2002. Se encontró una considerable heterogeneidad interespecífica con algunos niveles promedios altos de Cd en los decápodos: 1,9 mg kg-1 de peso seco en muestras del género Sergia; 6,1 mg kg^-1 en Acanthephyra pelágica (Risso, 1816) y en Acanthephyra acanthithelsonis (Bate, 1888); 10,7 mg kg-1 en Bentheogennema intermedia (Bate, 1888); 14,9 mg kg^-1 en Benthesicymus iridescens (Bate, 1881) y 16,3 mg kg-1 en Systellaspis debilis (A. Milne Edwards, 1881). La concordancia de estas altas concentraciones de Cd, con las registradas en crustáceos polares, y las concentraciones de Cu (17-56 mg kg^-1) indican que probablemente no se hayan cumplido todas las necesidades metabólicas. Se soporta la hipótesis que las anomalías de Cd, frecuentemente descritas en crustáceos polares, se podrían extender a otras aguas oceánicas relativamente profundas como la Llanura Abisal Ibérica y que podrían estar relacionadas con la correspondiente deficiencia de Cu. En este estudio, las concentraciones de Zn en decápodos (52-80 mg kg^-1) están dentro del rango mundial lo que indica que los decápodos son capaces de regular su concentración de Zn corporal. Nuestros datos preliminares obtenidos en muestras de mezclas de zooplancton sugieren que las concentraciones de Pb, muy por debajo de 1 mg Pb kg^-1, podrían servir como valores guía regionales para establecer comparaciones en estudios de biomonitoreo. Los resultados para Cd, Cu y Zn están dentro de los rangos publicados, especialmente para las regiones Central y Sur del Mar del Norte.

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