According to the economic and biological aspects of renewable resources management, we propose a Lotka-Volterra predator-prey model with state dependent impulsive harvest. By using the Poincaré map, some conditions for the existence and stability of positive periodic solution are obtained. Moreover, we show that there is no periodic solution with order larger than or equal to three under some conditions. Numerical results are carried out to illustrate the feasibility of our main results. The bifurcation diagrams of periodic solutions are obtained by using the numerical simulations, and it is shown that a chaotic solution is generated via a cascade of period-doubling bifurcations, which implies that the presence of pulses makes the dynamic behavior more complex.
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http://dx.doi.org/10.1016/j.biosystems.2009.06.001 | DOI Listing |
Ungulates serve as the primary carrion source for facultative scavengers in European ecosystems. In the absence of large carnivores, such as wolves (), human hunting leftovers are the main source of carrion for these scavengers. Additionally, wild boars () are heavily culled in many ecosystems and are both a significant prey species for wolves as well as a key scavenger.
View Article and Find Full Text PDFMicrob Pathog
December 2024
Department of Food Science and Technology, UIC Zoonosis y Enfermedades Emergentes ENZOEM, ceiA3, Universidad de Córdoba, 14014, Córdoba, Spain.
Listeria monocytogenes is the foodborne pathogen responsible for listeriosis in humans. Its ability to grow at refrigeration temperatures, particularly in products that support its growth and have a long-refrigerated shelf-life, poses a significant health risk, especially for vulnerable consumer groups such as pregnant women and immunocompromised individuals. A comprehensive analysis of L.
View Article and Find Full Text PDFPhys Rev E
July 2024
Department of Physics & Center for Soft Matter and Biological Physics, MC 0435, Robeson Hall, 850 West Campus Drive, Virginia Tech, Blacksburg, Virginia 24061, USA.
Stochastic reaction-diffusion models are employed to represent many complex physical, biological, societal, and ecological systems. The macroscopic reaction rates describing the large-scale, long-time kinetics in such systems are effective, scale-dependent renormalized parameters that need to be either measured experimentally or computed by means of a microscopic model. In a Monte Carlo simulation of stochastic reaction-diffusion systems, microscopic probabilities for specific events to happen serve as the input control parameters.
View Article and Find Full Text PDFNonlinear Dynamics Psychol Life Sci
April 2024
University of Bologna, Bologna, Italy.
The use of predator-prey models in economics has a long history, and the model equations have largely evolved since the original Lotka-Volterra system towards more realistic descriptions of the economic dynamics of predation, competition, and synergy. Seminal examples in this regard are the business cycle model (Goodwin, 1967), chaotic hysteresis (Rosser, 1994), and the models of renewable resources (Clark, 1990). Given this background, this paper aims to analyse the mechanism of economic competition under different conditions, by adopting the unifying framework of niche models.
View Article and Find Full Text PDFPlant Phenomics
January 2024
Yanqi Lake Beijing Institute of Mathematical Sciences and Applications, Beijing 101408, China.
Tree growth is the consequence of developmental interactions between above- and below-ground compartments. However, a comprehensive view of the genetic architecture of growth as a cohesive whole is poorly understood. We propose a systems biology approach for mapping growth trajectories in genome-wide association studies viewing growth as a complex (phenotypic) system in which above- and below-ground components (or traits) interact with each other to mediate systems behavior.
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