Prey Predator System
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Weak Allee effect in a predator-prey system involving distributed delays
In this paper we study the influence of weak Allee effect in a predator-prey system model. This effect is included in the prey equation and we determine conditions for the occurrence of Hopf bifurcation. The stability properties of the system and the biological issues of the memory and Allee models on the coexistence of the two species are studied. Finally w
Computational & Applied Mathematics. Publicado em: 2011
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2. Dinâmica de populações em redes ecológicas : persistências, catástrofes e extinções / Population dynamics in ecological networks : persistence, catastrophes and extinctions
All living organisms interact with individuals of its own species and also with those of other species, forming a complex network of interactions that have an important role in the preservation of the biodiversity. Understanding the underlying behavior and stability of these systems is of fundamental importance to the conservation of these resources. In this
Publicado em: 2011
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3. Dinâmica de populações: modelo predador-presa estocástico e difusivo em um reticulado / Dynamic population: Predator-prey stochastic and difusive model on a lattice
We have studied the predator-prey stochastic model defined on a lattice with first neighbour interactions. Each site of the lattice may assume one of three states: vacant, occupied by prey and occupied by predator. We have introduced a parameter that controls the possibility of difusion among sites. The model shows an oscilating phase, a non-oscilating phase
Publicado em: 2009
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4. Reaction-diffusion stochastic lattice model for a predator-prey system
We have the purpose of analyzing the effect of explicit diffusion processes in a predator-prey stochastic lattice model. More precisely we wish to investigate the possible effects due to diffusion upon the thresholds of coexistence of species, i. e., the possible changes in the transition between the active state and the absorbing state devoid of predators.
Brazilian Journal of Physics. Publicado em: 2008-03
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5. Anisotropic probabilistic cellular automaton for a predator-prey system
We consider a probabilistic cellular automaton to analyze the stochastic dynamics of a predator-prey system. The local rules are Markovian and are based in the Lotka-Volterra model. The individuals of each species reside on the sites of a lattice and interact with an unsymmetrical neighborhood. We look for the effect of the space anisotropy in the characteri
Brazilian Journal of Physics. Publicado em: 2007-06
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6. Processos de partÃculas sem colisÃes
We consider a class of particle processes with discrete time and a finite number of types of particles, which we call Processes Without Collisions or PWC for short. At every time step, any particle may die or transform itself into one or several particles of any types with certain probabilities, but there are no collisions, that is, every transformation appl
Publicado em: 2007
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7. Um sistema presa-predador com evasão mediada por feromônio de alarme / A predator-prey model with pursuit and evasion triggered by alarm pheromones
Pattern, structure and emergent collective properties are ubiquitous in systems with many units (alive or inanimated) coupled through nonlinear interactions. Within this context, the study of cooperative phenomena in population dynamics of ecological interest has attracted the attention of the mathematicians and physicists since Lotka and Volterra in the 192
Publicado em: 2006
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8. Estudo experimental da associação de Runcinioides argenteus (Araneae, Thomisidae) em Trichogoniopsis adenantha (DC) (Asteraceae)
In this study, some aspects of natural history of the tritrophic interactions of the system: Trichogoniopsis adenantha (DC) (Asteraceae) - herbivores and pollinators - sit and-wait predator, Runcinioides argenteus (Araneae, Thomisidae) were investigated in the Serra do Japi, southeast Brazil. To better understand this trophic system, the study included the p
Publicado em: 2001
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9. Multiple dynamics in a single predator-prey system: experimental effects of food quality.
Recent work with the freshwater zooplankton Daphnia has suggested that the quality of its algal prey can have a significant effect on its demographic rates and life-history patterns. Predator-prey theory linking food quantity and food quality predicts that a single system should be able to display two distinct patterns of population dynamics. One pattern is
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10. Matching host reactions to parasitoid wasp vibrations.
The sensory ecology of predator detection by prey has been little studied for any arthropod prey predator system, in contrast to the sensory ecology of prey finding by predators. The aim of this study was to quantify the foraging signals produced by the parasitoid Sympiesis sericeicornis (Hymenoptera: Eulophidae) and the sensory ecology of enemy detection an
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11. The role of noise in a predator–prey model with Allee effect
The existence and implications of alternative stable states in ecological systems have been investigated extensively within deterministic models. However, it is known that natural systems are undeniably subject to random fluctuations, arising from either environmental variability or internal effects. Thus, in this paper, we study the role of noise on the pat
Springer Netherlands.
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12. Rapid contemporary evolution and clonal food web dynamics
Character evolution that affects ecological community interactions often occurs contemporaneously with temporal changes in population size, potentially altering the very nature of those dynamics. Such eco-evolutionary processes may be most readily explored in systems with short generations and simple genetics. Asexual and cyclically parthenogenetic organisms
The Royal Society.