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Diel rhythms in shallow Mediterranean rocky-reef fishes: a chronobiological approach with the help of trained volunteers

AuthorsAzzurro, Ernesto ; Aguzzi, Jacopo ; Maynou, Francesc ; Chiesa, Juan José; Savini, Dario
KeywordsCitizen science
Mediterranean Sea
Fourier analysis
Waveform analysis
Visual census
Activity rhythms
Rocky-reef fishes
Issue DateMar-2013
PublisherCambridge University Press
CitationJournal of the Marine Biological Association of the UK 93(2): 461-470 (2013)
AbstractBehavioural rhythms in marine species have been mostly investigated in laboratory organisms and their expression within the animals' natural environments remains largely unknown. Here, we studied diel (i.e. 24-hours-based) and intra-diel (i.e. 12-hours-based) rhythmic variations in the abundance of seven shallow rocky-reef fish species, namely Coris julis, Epinephelus marginatus, Sarpa salpa, Serranus cabrilla, Serranus scriba, Sparisoma cretense and Thalassoma pavo, along the rocky shores of Linosa Island (Mediterranean Sea). Data were visually collected by trained volunteers along fixed transects at 3-hourly intervals throughout six consecutive 24-hours periods. Density estimates can vary greatly between consecutive days and during 24-hours periods according not only to the major day¿night changeover but also to minor intra-diel variations at the daylight hours. In the case of T. pavo, C. julis, S. cabrilla and S. salpa waveform analyses showed midday troughs in abundance within the 24-hours period but significant variation within the hours of daylight was highlighted only for T. pavo. Although results were not conclusive at the intra-dial level, the employment of volunteers represented a valuable tool for chronobiology, suitable to improve our understanding of fish behaviour in natural systems
Description10 pages, 6 figures, 1 table
Publisher version (URL)http://dx.doi.org/10.1017/S0025315412001166
Identifiersdoi: 10.1017/S0025315412001166
issn: 0025-3154
e-issn: 1469-7769
Appears in Collections:(ICM) Artículos
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