Sinopsis
Populations are made up of individual organisms, which interact and communicate with each other as they pursue their normal lives. For example, individuals mate, compete for scarce resources, and cooperate to capture prey or escape being eaten. As a result of these interactions individuals reproduce, move and die and these processes cause the population as a whole to behave in certain ways - populations grow, decline, or remain steady.
Any system you wish to consider, a television set or an automobile, is basically composed of a set of interacting parts that together produce patterns of behavior, which are characteristic of the system. This behavior is determined by the rules of interaction, and the overall structure of the interaction network. Populations, therefore, can be thought of as particular kinds of systems with their own rules and structure, which – nevertheless - obey certain general system laws. In the first chapter of this book we will take a brief excursion into the theory of dynamic systems in order to understand the properties and behavior of systems in general. Then these concepts will be applied to the analysis of single-species populations. In Chapter 2 a very simple model is developed from observations of the behavior of natural populations, which will help us to understand the fundamental rules of population growth. Then in Chapter 3 a more detailed model of the population system is created, along with a methodology for analyzing the behavior of dynamic population systems inhabiting variable environments.
Content
- A Brief Look at Systems in General
- What is a System?
- The State of a System
- Dynamical Systems
- System Diagrams
- Feedback Control
- The Stability of Systems
- Anticipatory Feedforward
- Systems Analysis in Biology
- Population Dynamics and an Elementary Model
- What is a Population?
- Dynamics of Populations
- An Elementary Population Model
- Analysis of the Model
- Environmental and Genetic Effects
- Population Regulation and a General Model
- Density-Dependent Mechanisms
- Competitive Processes
- Cooperative Processes
- Feedback Integration
- A General Population Model
- Analysis of the Model
- Environmental and Genetic Effects
- Populations in Changing Environments
- Environmental Feedback
- Complex Density-Dependent Relationships
- Systems of Interacting Populations
- Interactions Between Two Species
- Population Interactions
- Cooperative Interactions
- Competitive Interactions
- Nonlinear Competitive Interactions
- Strategies of the Competitor
- Predator-Prey Interactions
- Nonlinear Predator-Prey Interactions
- Predator Functional Responses
- Predation in Variable Environments
- Predator and Prey Strategies
- Interactions in Space
- Movements in Space
- Dynamics in Space
- The Spread and Collapse of Pest Epidemics
- Stability in Space
- Population Quality in Space
- Environmental Stratification
- Interactions Between Many Species (Ecological Communities)
- Community Structure
- Community Stability
- Predation as a Stabilizing Influence
- Community Dynamics
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