Analysis and Monte Carlo simulations of a model for the spread of infectious diseases in heterogeneous metapopulations
David Juher, Jordi Ripoll, and Joan Saldana
We present a study of the continuous-time equations governing the dynamics of a susceptible-infected-susceptible model on heterogeneous metapopulations. These equations have been recently proposed as an alternative formulation for the spread of infectious diseases in metapopulations in a continuous- ... [Phys. Rev. E 80, 041920 (2009)] published Tue Oct 20, 2009.
Statistical Mechanics of Ecosystem Assembly
Jose A. Capitan, Jose A. Cuesta, and Jordi Bascompte
We introduce a toy model of ecosystem assembly for which we are able to map out all assembly pathways generated by external invasions. The model allows us to display the whole phase space in the form of an assembly graph whose nodes are communities of species and whose directed links are transitions ... [Phys. Rev. Lett. 103, 168101 (2009)] published Tue Oct 13, 2009.
Fluctuations and dispersal rates in population dynamics
David A. Kessler and Leonard M. Sander
Dispersal of species to find a more favorable habitat is important in population dynamics. Dispersal rates evolve in response to the relative success of different dispersal strategies. In a simplified deterministic treatment [J. Dockery, V. Hutson, K. Mischaikow, and M. Pernarowski, J. Math. Biol. 3 ... [Phys. Rev. E 80, 041907 (2009)] published Tue Oct 6, 2009.
Anomalously Slow Attrition Times for Asymmetric Populations with Internal Group Dynamics
Zhenyuan Zhao, Juan Camilo Bohorquez, Alex Dixon, and Neil F. Johnson
The many-body dynamics exhibited by living objects include group formation within a population and the nonequilibrium process of attrition between two opposing populations due to competition or conflict. We show analytically and numerically that the combination of these two dynamical processes gener ... [Phys. Rev. Lett. 103, 148701 (2009)] published Fri Oct 2, 2009.
MULTISCALE PHENOMENA IN COASTAL MARINE ECOSYSTEMS
Brian P. Kinlan and Robert R. Warner
Abstract not available. [AIP Conf. Proc. 1167, 105 (2009)] published Wed Sep 23, 2009.
Robust ecological pattern formation induced by demographic noise
Thomas Butler and Nigel Goldenfeld
We demonstrate that demographic noise can induce persistent spatial pattern formation and temporal oscillations in the Levin-Segel predator-prey model for plankton-herbivore population dynamics. Although the model exhibits a Turing instability in mean-field theory, demographic noise greatly enlarges ... [Phys. Rev. E 80, 030902 (2009)] published Tue Sep 15, 2009.
Switching Feeding Among Sound and Infected Prey
Ines S. Hotopp, Horst Malchow, and Ezio Venturino
Here we investigate the switching feeding behavior of predators in the context of one single prey population, which is disease-affected. Moreover, we assume that feeding on the infected individuals has a negative return on the predators. ... [AIP Conf. Proc. 1168, 1536 (2009)] published Mon Sep 14, 2009.
A Virtual Hog Farm
Andrea Costamagna, Bruno Sona, and Ezio Venturino
Here we propose a very general model to simulate the operating of a hog farm. ... [AIP Conf. Proc. 1168, 1531 (2009)] published Mon Sep 14, 2009.
Fisher Waves in the Strong Noise Limit
Oskar Hallatschek and K. S. Korolev
We investigate the effects of a strong number fluctuations on traveling waves in the Fisher-Kolmogorov reaction-diffusion system. Our findings are in stark contrast to the commonly used deterministic and weak-noise approximations. We compute the wave velocity in one and two spatial dimensions, for w ... [Phys. Rev. Lett. 103, 108103 (2009)] published Wed Sep 2, 2009.
CLUSTERED SELF ORGANISING MIGRATING ALGORITHM FOR THE QUADRATIC ASSIGNMENT PROBLEM
Donald Davendra, Ivan Zelinka, and Roman Senkerik
An approach of population dynamics and clustering for permutative problems is presented in this paper. Diversity indicators are created from solution ordering and its mapping is shown as an advantage for population control in metaheuristics. Self Organising Migrating Algorithm (SOMA) is modified usi ... [AIP Conf. Proc. 1159, 282 (2009)] published Mon Aug 24, 2009.
Impact of aging on the evolution of cooperation in the spatial prisoner's dilemma game
Attila Szolnoki, Matjaz Perc, Gyorgy Szabo, and Hans-Ulrich Stark
Aging is always present, tailoring our interactions with others, and postulating a finite lifespan during which we are able to exercise them. We consider the prisoner's dilemma game on a square lattice and examine how quenched age distributions and different aging protocols influence the evolution o ... [Phys. Rev. E 80, 021901 (2009)] published Tue Aug 4, 2009.
Percolation and epidemics in random clustered networks
Joel C. Miller
The social networks that infectious diseases spread along are typically clustered. Because of the close relation between percolation and epidemic spread, the behavior of percolation in such networks gives insight into infectious disease dynamics. A number of authors have studied percolation or epide ... [Phys. Rev. E 80, 020901 (2009)] published Tue Aug 4, 2009.
Extinction Rate Fragility in Population Dynamics
M. Khasin and M. I. Dykman
Population extinction is of central interest for population dynamics. It may occur from a large rare fluctuation. We find that, in contrast to related large-fluctuation effects like noise-induced interstate switching, quite generally extinction rates in multipopulation systems display fragility, whe ... [Phys. Rev. Lett. 103, 068101 (2009)] published Tue Aug 4, 2009.
Modeling synchronized calling behavior of Japanese tree frogs
Ikkyu Aihara
We experimentally observed synchronized calling behavior of male Japanese tree frogs Hyla japonica; namely, while isolated single frogs called nearly periodically, a pair of interacting frogs called synchronously almost in antiphase or inphase. In this study, we propose two types of phase-oscillator ... [Phys. Rev. E 80, 011918 (2009)] published Thu Jul 23, 2009.
Deterministic evolutionary game dynamics in finite populations
Philipp M. Altrock and Arne Traulsen
Evolutionary game dynamics describes the spreading of successful strategies in a population of reproducing individuals. Typically, the microscopic definition of strategy spreading is stochastic such that the dynamics becomes deterministic only in infinitely large populations. Here, we present a micr ... [Phys. Rev. E 80, 011909 (2009)] published Fri Jul 10, 2009.
Population genetics and range expansions
Oskar Hallatschek and David R. Nelson
This year the world celebrates the bicentennial of Charles Darwin's birth. In 1968, geneticist Motoo Kimura, building on work by Theodore Dobzhansky, Sewall Wright, Ronald Fisher, and others, elaborated Darwin's celebrated theory by proposing that natural selection is largely irrelevant for evolutio ... [Phys. Today 62, 42 (2009)] published Wed Jul 1, 2009.
Numerical solution of the Penna model of biological aging with age-modified mutation rate
M. S. Magdon-Maksymowicz and A. Z. Maksymowicz
In this paper we present results of numerical calculation of the Penna bit-string model of biological aging, modified for the case of a-dependent mutation rate m(a), where a is the parent's age. The mutation rate m(a) is the probability per bit of an extra bad mutation introduced in offspring inheri ... [Phys. Rev. E 79, 061919 (2009)] published Wed Jun 17, 2009.
Publisher's Note: Four-state rock-paper-scissors games in constrained Newman-Watts networks [Phys. Rev. E 79, 062901 (2009)]
Guo-Yong Zhang, Yong Chen, Wei-Kai Qi, and Shao-Meng Qing
Abstract not available. [Phys. Rev. E 79, 069904 (2009)] published Fri Jun 12, 2009.
Rate of fixation of beneficial mutations in sexual populations
Joseilme F. Gouveia, Viviane M. de Oliveira, Caio Satiro, and Paulo R. A. Campos
We have investigated the rate of substitution of advantageous mutations in populations of haploid organisms where the rate of recombination can be controlled. We have verified that in all the situations recombination speeds up adaptation through recombination of beneficial mutations from distinct li ... [Phys. Rev. E 79, 061915 (2009)] published Thu Jun 11, 2009.
Four-state rock-paper-scissors games in constrained Newman-Watts networks
Guo-Yong Zhang, Yong Chen, Wei-Kai Qi, and Shao-Meng Qing
We study the cyclic dominance of three species in two-dimensional constrained Newman-Watts networks with a four-state variant of the rock-paper-scissors game. By limiting the maximal connection distance R in Newman-Watts networks with the long-range connection probability p, we depict more realistic ... [Phys. Rev. E 79, 062901 (2009)] published Tue Jun 2, 2009.
Influence of turbulent advection on a phytoplankton ecosystem with nonuniform carrying capacity
William J. McKiver and Zoltan Neufeld
In this work we study a plankton ecosystem model in a turbulent flow. The plankton model we consider contains logistic growth with a spatially varying background carrying capacity and the flow dynamics are generated using the two-dimensional (2D) Navier-Stokes equations. We characterize the system i ... [Phys. Rev. E 79, 061902 (2009)] published Tue Jun 2, 2009.