Article
MSC:
34C25,
34D23,
34K13,
34K18,
34K20,
34K60,
92D25,
92D40 | MR 2657835 | Zbl 1224.34270 | DOI: 10.1007/s10492-010-0009-5
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Keywords:
autotroph; herbivore; nutrient recycling; global stability; Hopf-bifurcation; variable delay; two-timing expansion
autotroph; herbivore; nutrient recycling; global stability; Hopf-bifurcation; variable delay; two-timing expansion
Summary:
We consider a mathematical model of nutrient-autotroph-herbivore interaction with nutrient recycling from both autotroph and herbivore. Local and global stability criteria of the model are studied in terms of system parameters. Next we incorporate the time required for recycling of nutrient from herbivore as a constant discrete time delay. The resulting DDE model is analyzed regarding stability and bifurcation aspects. Finally, we assume the recycling delay in the oscillatory form to model the daily variation in nutrient recycling and deduce the stability criteria of the variable delay model. A comparison of the variable delay model with the constant delay one is performed to unearth the biological relevance of oscillating delay in some real world ecological situations. Numerical simulations are done in support of analytical results.
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