Abstract
Lingua originale | English |
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pagine (da-a) | 1-21 |
Numero di pagine | 21 |
Rivista | Default journal |
Volume | 2016 |
Stato di pubblicazione | Published - 2016 |
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All Science Journal Classification (ASJC) codes
- Statistical and Nonlinear Physics
- Statistics and Probability
- Statistics, Probability and Uncertainty
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The role of noise on the steady state distributions of phytoplankton populations. / Spagnolo, Bernardo; Denaro, Giovanni; Valenti, Davide; Denaro; Basilone, Gualtiero; Spagnolo; Mazzola, Salvatore; Bonanno, Angelo; Valenti; Brunet, Christophe; Conversano, Fabio.
In: Default journal, Vol. 2016, 2016, pag. 1-21.Risultato della ricerca: Article
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TY - JOUR
T1 - The role of noise on the steady state distributions of phytoplankton populations
AU - Spagnolo, Bernardo
AU - Denaro, Giovanni
AU - Valenti, Davide
AU - Denaro, null
AU - Basilone, Gualtiero
AU - Spagnolo, null
AU - Mazzola, Salvatore
AU - Bonanno, Angelo
AU - Valenti, null
AU - Brunet, Christophe
AU - Conversano, Fabio
PY - 2016
Y1 - 2016
N2 - The spatio-temporal behaviour of total chlorophyll concentration is investigated in the middle of the Tyrrhenian Sea by using a stochastic approach. The study is based on a reaction-diffusion-taxis model, which is used to analyse the dynamics of five phytoplankton groups, responsible for about 80% of the total chlorophyll a inside the euphotic zone of the water column. The analysis is performed by considering: (i) the intraspecific competition of the phytoplanktonic groups for limiting factors, i.e. light intensity and nutrient concentration, (ii) the seasonal changes of environmental variables, and (iii) the random fluctuations of the components of the velocity field and temperature. Specifically, we investigate the effects of external perturbations, both deterministic and random, on the dynamics of phytoplankton populations, by inserting a term of multiplicative noise into the differential equation of the nutrient dynamics. The theoretical results of the phytoplankton abundances obtained by the stochastic model are converted in chlorophyll a concentrations, and compared with the experimental findings. The statistical checks, based on the chi-square test, show that the vertical distributions of total chlorophyll concentration are in a good agreement with the experimental data. Finally, we observe that the high intensity of environmental noise strongly modifies the steady spatial distributions of two phytoplankton groups usually localized in deeper layers, causing algal blooms in surface water.
AB - The spatio-temporal behaviour of total chlorophyll concentration is investigated in the middle of the Tyrrhenian Sea by using a stochastic approach. The study is based on a reaction-diffusion-taxis model, which is used to analyse the dynamics of five phytoplankton groups, responsible for about 80% of the total chlorophyll a inside the euphotic zone of the water column. The analysis is performed by considering: (i) the intraspecific competition of the phytoplanktonic groups for limiting factors, i.e. light intensity and nutrient concentration, (ii) the seasonal changes of environmental variables, and (iii) the random fluctuations of the components of the velocity field and temperature. Specifically, we investigate the effects of external perturbations, both deterministic and random, on the dynamics of phytoplankton populations, by inserting a term of multiplicative noise into the differential equation of the nutrient dynamics. The theoretical results of the phytoplankton abundances obtained by the stochastic model are converted in chlorophyll a concentrations, and compared with the experimental findings. The statistical checks, based on the chi-square test, show that the vertical distributions of total chlorophyll concentration are in a good agreement with the experimental data. Finally, we observe that the high intensity of environmental noise strongly modifies the steady spatial distributions of two phytoplankton groups usually localized in deeper layers, causing algal blooms in surface water.
UR - http://hdl.handle.net/10447/205176
UR - http://iopscience.iop.org/article/10.1088/1742-5468/2016/05/054044/pdf
M3 - Article
VL - 2016
SP - 1
EP - 21
JO - Default journal
JF - Default journal
ER -