Data/hora: 13/06/2024 05:29:36

Provedor de dados: 	5	
País: 	France	
Título: 	Phytoplankton competition and coexistence: Intrinsic ecosystem dynamics and impact of vertical mixing	
Autores: 	Perruche, Coralie; Riviere, Pascal; Pondaven, Philippe; Carton, Xavier.	
Data: 	2010-04	
Ano: 	2010	
Palavras-chave: 	Water mixing; Dynamical system; Phytoplankton; Competition; Ecosystem; Modelling.	
Resumo: 	This paper aims at studying analytically the functioning of a very simple ecosystem model with two phytoplankton species. First, using the dynamical system theory, we determine its nonlinear equilibria, their stability and characteristic timescales with a focus on phytoplankton competition. Particular attention is paid to the model sensitivity to parameter change. Then, the influence of vertical mixing and sinking of detritus on the vertically-distributed ecosystem model is investigated. The analytical results reveal a high diversity of ecosystem structures with fixed points and limit cycles that are mainly sensitive to variations of light intensity and total amount of nitrogen matter. The sensitivity to other parameters such as remineralisation, growth and grazing rates is also specified. Besides, the equilibrium analysis shows a complete segregation of the two phytoplankton species in the whole parameter space. The embedding of our ecosystem model into a one-dimensional numerical model with diffusion turned out to allow coexistence between phytoplankton species, providing a possible solution to the 'paradox of plankton' in that sense that it prevents the competitive exclusion of one phytoplankton species. These results improve our knowledge of the factors that control the structure and functioning of plankton communities.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2009/publication-7334.pdf

DOI:10.1016/j.jmarsys.2009.12.006	
Editor: 	Elsevier	
Relação: 	http://archimer.ifremer.fr/doc/00000/7334/	
Formato: 	application/pdf	
Fonte: 	Journal of Marine Systems (Elsevier), 2010-04 , Vol. 81 , N. 1-2 , P. 99-111	
Fonte: 	2010 Elsevier Ltd All rights reserved.