Preliminary evidences of circadian fan activity rhythm in &lt;i&gt;Sabella spallanzanii&lt;/i&gt; (Gmelin, 1791) (Polychaeta: Sabellidae)

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

doi:10.3989/scimar.2006.70n4727

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…The threshold line also indicated the temporal limits of peaks allowing the activity timings of different species to be compared with each other (Aguzzi et al , 2009). This procedure was carried out similarly to the Mean Estimate Statistic Of Rhythm procedure (MESOR: Aguzzi et al , 2006). MESOR is the value midway between the highest and the lowest values of a cosine function best fitting rhythmic time-series.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2012

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Behavioural 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.

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Section: Methodsmentioning

confidence: 99%

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

et al. 2012

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“…The statistical tools required for such analyses are already available in commercial chronobiological software applications which are used to statistically describe rhythms at molecular, physiological and behavioural level (e.g., , Aguzzi et al 2006bTosini et al 2007). However, further development is needed for these tools to become more user-friendly, to fully satisfy the needs of biological and habitat data multiparametric analyses in field study of populations, i.e., in terms of applying automated sequential steps for data pre-processing (i.e., filtering; see below) and consequent time series analysis.…”

Section: From Descriptive To More Cause-effect-based Deep Water Ecologymentioning

confidence: 99%

Changing coasts: Marine aliens and articial structures

Mineur

Cook

Minchin³

et al. 2012

Oceanography and Marine Biology

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All marine species studied thus far show rhythmic temporal patterns in their behavioural, physiological, and molecular functions, which are collectively known as biological rhythms. Biological rhythms are generated by biological clocks that time biological functions and are synchronised by geophysical cycles such as the solar lightdark cycle and tidal cycle. On continental margins, behavioural rhythms can be detected by diel (i.e., 24-h based) or seasonal periodical trawling as a consequence of massive inward and outward displacements of populations to and from the sample areas. As a result, significant errors in population/stock and biodiversity assessments performed by trawling may occur if timing of sampling is not taken into account. The increasing number of cabled and permanent multiparametric seafloor observatories now allows direct, continuous, and long-lasting monitoring of benthic ecosystems and analysis in relation to several habitat cycles. This review describes the adaptation of this technology to investigations of rhythmic behaviour by focusing on automated videoimaging. Diel fluctuations in the number of video-observed individuals can be used as a measure of average population rhythmic behaviour. The potential implementation of automated video image analysis in relation to animal tracking and classification procedures based on the combined use of morphometric tools and multivariate statistics is detailed in relation to populational and community studies. Based on video cameras mounted at multiparametric cabled observatories, an integrated time-series analysis protocol using chrono-biomedical procedures is proposed to place video-recorded bioinformation in an oceanographic context.

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“…During 5 days, animals were exposed to a 12-h light-darkness cycle of 100 lux, created with a white light neon lamp. That high light intensity was chosen to enhance the response of animals to the photic phase and to compact their behavioural swimming bouts into single coherent outputs avoiding at the same time the insurgence of ultradian rhythms (Aguzzi et al, 2006a). Light ON and OFF timings were respectively set at 0900 and 2100 h.…”

Section: Methodsmentioning

confidence: 99%

Day-night activity rhythm of the cold seep shrimp Alvinocaris stactophila (Caridea: Alvinocarididae) from the Gulf of Mexico

et al. 2007

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The activity rhythm of the cold seep shrimp Alvinocaris stactophila from the Gulf of Mexico slope (650 m depth) was investigated in the laboratory in relation to an artificial 12 h light-dark regime. Animals were sampled with a submersible and transferred into individual aquaria where their activity was monitored for 5 d by taking digital video snapshots every 30 s. An observer analysed the footage by counting the number of times an animal crossed two perpendicular lines drawn on a PC screen per 30 min interval. Resulting time series were represented over consecutive days and the waveform analysis was used to precisely assess the phase (i.e. the peak timing) and its limits (i.e. onset and offset) in relation to light ON and OFF. The majority (73%) of animals showed a marked nocturnal pattern of activity with number of movements close to zero during the photophase. Waveform analysis showed that the behavioural transition from activity to inactivity after light ON occurred within approximately 1 h. Considering the general lack of knowledge on the regulation of activity rhythms of crustaceans from subtidal areas, the present data provide a new insight on the role played by light in the regulation of animal activity rhythm in deep-water environments such as those of the cold seeps in the Gulf of Mexico.

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

Cited by 12 publications

References 33 publications

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

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

Changing coasts: Marine aliens and articial structures

Day-night activity rhythm of the cold seep shrimp Alvinocaris stactophila (Caridea: Alvinocarididae) from the Gulf of Mexico

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

Cited by 12 publications

References 33 publications

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

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

Changing coasts: Marine aliens and articial structures

Day-night activity rhythm of the cold seep shrimp Alvinocaris stactophila (Caridea: Alvinocarididae) from the Gulf of Mexico

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Changing coasts: Marine aliens and articial structures