The role of noise on the steady state distributions of phytoplankton populations

Bernardo Spagnolo, Giovanni Denaro, Davide Valenti, Denaro, Gualtiero Basilone, Spagnolo, Salvatore Mazzola, Angelo Bonanno, Valenti, Christophe Brunet, Fabio Conversano

Risultato della ricerca: Article

3 Citazioni (Scopus)

Abstract

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.
Lingua originaleEnglish
pagine (da-a)1-21
Numero di pagine21
RivistaJournal of Statistical Mechanics: Theory and Experiment
Volume2016
Stato di pubblicazionePublished - 2016

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phytoplankton
Steady-state Distribution
Phytoplankton
chlorophylls
Chlorophyll a
Chlorophyll
nutrients
Nutrients
Water
Chi-squared test
vertical distribution
Reaction-diffusion Model
Multiplicative Noise
Light Intensity
algae
surface water
Spatial Distribution
Velocity Field
luminous intensity
Stochastic Model

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: Journal of Statistical Mechanics: Theory and Experiment, Vol. 2016, 2016, pag. 1-21.

Risultato della ricerca: Article

Spagnolo, B, Denaro, G, Valenti, D, Denaro, Basilone, G, Spagnolo, Mazzola, S, Bonanno, A, Valenti, Brunet, C & Conversano, F 2016, 'The role of noise on the steady state distributions of phytoplankton populations', Journal of Statistical Mechanics: Theory and Experiment, vol. 2016, pagg. 1-21.
Spagnolo B, Denaro G, Valenti D, Denaro, Basilone G, Spagnolo e altri. The role of noise on the steady state distributions of phytoplankton populations. Journal of Statistical Mechanics: Theory and Experiment. 2016;2016:1-21.
Spagnolo, Bernardo ; Denaro, Giovanni ; Valenti, Davide ; Denaro ; Basilone, Gualtiero ; Spagnolo ; Mazzola, Salvatore ; Bonanno, Angelo ; Valenti ; Brunet, Christophe ; Conversano, Fabio. / The role of noise on the steady state distributions of phytoplankton populations. In: Journal of Statistical Mechanics: Theory and Experiment. 2016 ; Vol. 2016. pagg. 1-21.
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abstract = "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.",
author = "Bernardo Spagnolo and Giovanni Denaro and Davide Valenti and Denaro and Gualtiero Basilone and Spagnolo and Salvatore Mazzola and Angelo Bonanno and Valenti and Christophe Brunet and Fabio Conversano",
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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

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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

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JO - Journal of Statistical Mechanics: Theory and Experiment

JF - Journal of Statistical Mechanics: Theory and Experiment

SN - 1742-5468

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