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Tytuł:
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Bifurcations and hydra effects in Bazykin's predator-prey model.
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Autorzy:
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Adhikary PD; Department of Mathematics, National Institute of Technology Meghalaya, Bijni Complex, Shillong 793003, Meghalaya, India. Electronic address: .
Mukherjee S; Department of Mathematics, National Institute of Technology Meghalaya, Bijni Complex, Shillong 793003, Meghalaya, India. Electronic address: .
Ghosh B; Department of Mathematics, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore 453552, Madhya Pradesh, India. Electronic address: .
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Źródło:
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Theoretical population biology [Theor Popul Biol] 2021 Aug; Vol. 140, pp. 44-53. Date of Electronic Publication: 2021 May 27.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Original Publication: New York, Academic Press.
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MeSH Terms:
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Food Chain*
Predatory Behavior*
Animals ; Ecosystem ; Fisheries ; Models, Biological ; Population Dynamics
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Contributed Indexing:
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Keywords: Intraspecific competition; Multi-stability; Population dynamics; Saddle–node bifurcation; Stable stock
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Entry Date(s):
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Date Created: 20210530 Date Completed: 20210823 Latest Revision: 20210823
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Update Code:
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20240105
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DOI:
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10.1016/j.tpb.2021.05.002
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PMID:
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34052251
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We consider Bazykin's model to address harvesting induced stability exchanges through bifurcation analysis. We examine the existence of hydra effects and analyze the stock pattern under predator harvesting. Prey harvesting cannot produce hydra effects in our model, whereas predator harvesting may cause multiple hydra effects. Our study reveals that type II response function and mutual interference among predators jointly induce multiple hydra effects and bistability. Bifurcations such as single Hopf-bifurcation, multiple Hopf-bifurcations and multiple saddle-node bifurcations appear for increasing harvesting rate on the predators. However, over-exploitation of the predators cannot generate any such bifurcation in our study. In simulations, the maximum sustainable yield (MSY) exists at a globally stable state. When predator is culled under increasing effort, basin of attraction of the equilibrium corresponding to the higher predator stock gets expanded, which alternatively is in favor of stock benefit for predators. The ecological theory developed in this study might be useful to understand conservation policy and fishery management.
(Copyright © 2021 Elsevier Inc. All rights reserved.)
