Giuseppe Magnifico - Academia.edu (original) (raw)
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Papers by Giuseppe Magnifico
Journal of Theoretical Biology, 2009
The study of animal growth is a longstanding crucial topic of theoretical biology.
Ices Journal of Marine Science, 2009
Stock assessment may gain from taking into account individual variations in growth, because size ... more Stock assessment may gain from taking into account individual variations in growth, because size is a key predictor of survival and reproduction. In trying to understand patterns in empirical observations, a major challenge is to model the changes in the size distribution of a ...
Italian Journal of Zoology, 2008
Circadian and ultradian rhythms were analyzed in Sabella spallanzanii tested in laboratory consta... more Circadian and ultradian rhythms were analyzed in Sabella spallanzanii tested in laboratory constant darkness conditions. A video camera took images per 30 s during a week. The number of times animals opened the fan per 30 min was counted by an observer. Resulting time series were subdivided into 24‐h segments in order to assess the change of the activity rhythm over consecutive days. Periodogram and waveform analyses measured the periodicity and the pattern of fluctuation, at each cycle. Results indicate that animals express a major circadian peak in the first day of test, and this progressively spits into subcomponents from days 2 to 4. At days 5 and 6 the circadian peak is reconstituted. The activity phase of a rhythm (α) and its amplitude of oscillation were also computed per 24‐h segments. The values of different time series were averaged at corresponding 24‐h stages. A significant increment of mean α was observed from days 1 to 4, while conversely the amplitude decreased. From days 5 to day 6, an opposite trend in both variables was observed. These results are descriptive but can be interpreted in the context of models accounting for the generation of ultradian rhythms when controlling oscillators became transiently uncoupled.
Journal of Theoretical Biology, 2009
The study of animal growth is a longstanding crucial topic of theoretical biology.
Ices Journal of Marine Science, 2009
Stock assessment may gain from taking into account individual variations in growth, because size ... more Stock assessment may gain from taking into account individual variations in growth, because size is a key predictor of survival and reproduction. In trying to understand patterns in empirical observations, a major challenge is to model the changes in the size distribution of a ...
Italian Journal of Zoology, 2008
Circadian and ultradian rhythms were analyzed in Sabella spallanzanii tested in laboratory consta... more Circadian and ultradian rhythms were analyzed in Sabella spallanzanii tested in laboratory constant darkness conditions. A video camera took images per 30 s during a week. The number of times animals opened the fan per 30 min was counted by an observer. Resulting time series were subdivided into 24‐h segments in order to assess the change of the activity rhythm over consecutive days. Periodogram and waveform analyses measured the periodicity and the pattern of fluctuation, at each cycle. Results indicate that animals express a major circadian peak in the first day of test, and this progressively spits into subcomponents from days 2 to 4. At days 5 and 6 the circadian peak is reconstituted. The activity phase of a rhythm (α) and its amplitude of oscillation were also computed per 24‐h segments. The values of different time series were averaged at corresponding 24‐h stages. A significant increment of mean α was observed from days 1 to 4, while conversely the amplitude decreased. From days 5 to day 6, an opposite trend in both variables was observed. These results are descriptive but can be interpreted in the context of models accounting for the generation of ultradian rhythms when controlling oscillators became transiently uncoupled.