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Title | Type |
|---|---|
Effects of population and population pressure on forest resources and their conservation: a modeling study | Model |
| in this model, cumulative density of forest resources and population density use generalized logistic models with predatory-prey type nonlinear interactions. The model is an effort to capture not only the effect of population density on forest resources (a logistic model), but also the effect of population pressure on forest resources, which grows proportionally to population density and is limited by the carrying capacity of the forest. Additionally, it models the effect of economic... | 01 Oct 2016 |
Human and nature dynamics (HANDY): Modeling inequality and use of resources in the collapse or sustainability of societies | Model |
| HANDY is a 4-variable thought-experiment model for interaction of humans and nature. The focus is on predicting long-term behavior rather than short-term forecasting. Carrying Capacity is developed as a practical measure for forecasting collapses. A sustainable steady state is shown to be possible in different types of societies but over-exploitation of either Labor or Nature results in a societal collapse. | 09 Oct 2016 |
Institutional features of fishery catch shares | Case |
| Catch shares are becoming an increasingly common mechanism to manage fishery harvests. This case represents an analysis of the general institutional features of catch shares. | 09 Aug 2016 |
Living in a network of scaling cities and finite resources | Model |
| A modified Lotka-Volterra system in which multiple consumers and resource systems are connected by both consumer-consumer and consumer-resource links. Consumers represent cities, and thus exhibit nonlinear scaling behaviors as population increases w.r.t. harvest rate and harvest conversion efficiency. Populations can also migrate between cities along a welfare-dependent gradient.Analysis of the model for a simple dyadic network reveals that the basic Lotka-Volterra formulation can lead to... | 30 Sep 2016 |
Lotka-Volterra Competition | Model |
| Symmetric competition model | 09 Aug 2016 |
Measuring Riparian Width | Model |
| This model is a modification of an older model by Camporeale and Ridolfi (2006) that studied the influence of river flow variability on the distribution of biomass of riparian vegetation. The new and modified model defines an upper or hillside bound of riparian vegetation, in addition to the lower bound defined in the older model, and thus clearly delineate riparian width. The assumptions made in the model include:(1) Only one species is considered, thus ignoring interspecific dynamics. (2... | 30 Nov 2017 |
Simple Model of Farming/Gathering Transition | Model |
| This is a stylised model capturing "the interdependencies of foraging, farming and productivity of an ecosystem" and can be used to "explore alternative scenarios of niche construction and ecological inheritance." The model has two components, forest growth and time allocated to either foraging or farming, coupled together. Three basic model assumptions are 1) individuals are households, 2) households choose to produce either tree seeds or maize and 3) territory is open access. Allocation of... | 06 Oct 2016 |
Social Ostracism and Resource Management | Model |
| This replicator dynamics model considers the case of a common-pool resource system where social ostracism may be used to compel non-complying harvesters to avoid over-exploitation of the resource base. Here, non-compliant harvesters (i.e., defectors) are identified by their payoff strategy and incur an 'ostracism' penalty proportional to the number of compliant harvesters (i.e., co-operators) in the system. When the ostracism effect is equivalent to the number of compliant harvesters and the... | 07 Oct 2016 |
Two-actor conflict with time delay: A dynamical model | Model |
| Based on previous mathematical studies, the authors created a model to analyze the conflict dynamics between two actors. In this model, they modified previous nonlinear dynamical models by Liebovitch et al. (2008) and Liebovitch, Vallacher, & Michaels (2010) by considering nonlinear delayed response between two actors. The results of the model show that under certain initial and feedback conditions, a stable neutral equilibrium of conflict may destabilize for some critical values of time... | 05 Oct 2016 |