Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/2450
Title: Effects of symmetric and asymmetric dispersal on the dynamics of heterogeneous metapopulations: Two-patch systems revisited
Authors: Dey, Snigdhadip
Goswami, Bedartha
Joshi, Amitabh
Keywords: Biology
Mathematical & Computational Biology
Ricker Model
Stability
Stabilization
Periodicity
Chaos
Simple Population-Models
Coupled Logistic Map
Immigration
Stability
Persistence
Discrete
Synchrony
Growth
Issue Date: 2014
Publisher: Academic Press Ltd- Elsevier Science Ltd
Citation: Dey, S; Goswami, B; Joshi, A, Effects of symmetric and asymmetric dispersal on the dynamics of heterogeneous metapopulations: Two-patch systems revisited. Journal of Theoretical Biology 2014, 345, 52-60, http://dx.doi.org/10.1016/j.jtbi.2013.12.005
Journal of Theoretical Biology
345
Abstract: Although the effects of dispersal on the dynamics of two-patch metapopulations are well studied, potential interactions between local dynamics and asymmetric dispersal remain unexplored. We examined the dynamics of two Ricker models coupled by symmetric or asymmetric constant-fraction dispersal at different rates. Unlike previous studies, we extensively sampled the r(1)-r(2) space and found that stability of the coupled system was markedly affected by interactions between dispersal (in terms of strength and asymmetry) and local dynamics. When both subpopulations were intrinsically chaotic, increased symmetry in the exchange of individuals had a greater stabilizing impact on the dynamics of the system. When one subpopulation showed considerably more unstable dynamics than the other, higher asymmetry in the exchange of individuals had a stabilizing or destabilizing effect on the dynamics depending on whether the net dispersal bias was from the relatively stable to the relatively unstable subpopulation, or vice versa. The sensitivity of chaotic dynamics to stabilization due to dispersal varied with r-value in the chaotic subpopulation. Under unidirectional or bidirectional symmetric dispersal, when one subpopulation was intrinsically chaotic and the other had stable dynamics, the stabilization of chaotic subpopulations with r similar to 3.3-4.0 occurred at the lowest dispersal rates, followed by chaotic subpopulations with r similar to 2.7-2.95 and, finally, chaotic subpopulations with r similar to 2.95-3.3. The mechanism for this pattern is not known but might be related to the range and number of different attainable population sizes possible in different r-value zones. (C) 2013 Elsevier Ltd. All rights reserved.
Description: Restricted Access
URI: http://hdl.handle.net/10572/2450
ISSN: 0022-5193
Appears in Collections:Research Articles (Amitabh Joshi)

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