Preliminary evidences of circadian fan activity rhythm in <i>Sabella spallanzanii</i> (Gmelin, 1791) (Polychaeta: Sabellidae)

Jacopo Aguzzi; Juan José Chiesa; Riccardo Caprioli; Davide Cascione; Giuseppe Magnifico; Valentina Rimatori; Corrado Costa

doi:10.3989/scimar.2006.70n4727

Autores/as

Jacopo Aguzzi Institut de Ciències del Mar (CSIC). Barcelona
Juan José Chiesa Departament de Fisiologia, Facultat de Farmacia, Universitat de Barcelona
Riccardo Caprioli Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome
Davide Cascione Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome
Giuseppe Magnifico Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome
Valentina Rimatori Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome
Corrado Costa Laboratory of Experimental Ecology and Aquaculture, Dept. Biology, University of Rome “Tor Vergata”, Rome

DOI:

https://doi.org/10.3989/scimar.2006.70n4727

Palabras clave:

Sabella spallanzanii, actividad del abanico, ritmos circadianos, encarrilamiento

Resumen

En este trabajo, se estudiaron el ritmo de apertura del abanico del poliqueto Sabella spallanzanii (Gmelin, 1791) y su capacidad de encarrilamiento a la luz. Los animales fueron expuestos bajo oscuridad constante (DD) seguida por dos regímenes consecutivos de luz-oscuridad de 24 h, el primero compuesto por 11 h de luz (LD), y el segundo por 9 h de luz y con su fase invertida (DL). Dicha actividad se midió utilizando fotogramas tomados cada 30 s, mediante una videocámara analógica provista de iluminación infrarroja. Los fotogramas mostrando el abanico abierto fueron sumados cada 15 min. En DD, se detectó una periodicidad débil, en curso libre de rango circadiano en todos los animales. El ritmo se mostró más robusto y asumió un valor de 24 h bajo los dos fotoperíodos empleados. Se evidenció una actividad nocturna con anticipación (encarrilamiento) al apagado de la luz. Además, esta fase de encarrilamiento fue diferente entre LD y DL. La presencia de un ritmo de actividad endógeno con una fase de encarrilamiento variable, sugiere la presencia de un oscilador circadiano.

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