Dynamics of harmful algae with seasonal temperature variations in the cove-main lake

Feng-Bin Wang; Sze-Bi Hsu; Wendi Wang

doi:10.3934/dcdsb.2016.21.313

Article Contents

2016, Volume 21, Issue 1: 313-335. Doi: 10.3934/dcdsb.2016.21.313

This issue Previous Article An almost periodic epidemic model with age structure in a patchy environment Next Article Global attractors for the Gray-Scott equations in locally uniform spaces

Dynamics of harmful algae with seasonal temperature variations in the cove-main lake

1.
Department of Natural Science in the Center for General Education, Chang Gung University, Kwei-Shan, Taoyuan 333
2.
Department of Mathematics, National Tsing Hua University, Hsinchu 300
3.
School of Mathematics and Statistics, Southwest University, Chongqing, 400715

Received: March 31, 2015

Revised: June 30, 2015

Published: December 2015

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Abstract

In this paper, we investigate two-vessel gradostat models describing the dynamics of harmful algae with seasonal temperature variations, in which one vessel represents a small cove connected to a larger lake. We first define the basic reproduction number for the model system, and then show that the trivial periodic state is globally asymptotically stable, and algae is washed out eventually if the basic reproduction number is less than unity, while there exists at least one positive periodic state and algal blooms occur when it is greater than unity. There are several types of productions for dissolved toxins, related to the algal growth rate, and nutrient limitation, respectively. For the system with a specific toxin production, the global attractivity of positive periodic steady-state solution can be established. Numerical simulations from the basic reproduction number show that the factor of seasonality plays an important role in the persistence of harmful algae.

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Mathematics Subject Classification: Primary: 34C12, 34D20; Secondary: 34D23.

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