Aquatic life water quality criteria are numeric or narrative descriptions of water quality that protect aquatic life from unhealthy water conditions. The Clean Water Act (CWA) requires the U.S. Environmental Protection Agency (EPA) to develop and, as necessary, revise “criteria for water...

Nutrient enrichment of marine ecosystems is regarded as a pressing global environmental problem. For certain marine species it may be a mixed blessing, resulting in damaging ecosystem events, but contributing to primary productivity. Consequently, the impact of enrichment on fishery profits may...

La gestión eficiente de ciertos recursos renovables caracterizados por la propiedad común y el libre acceso ha estado mediatizada por la denominada «Tragedia de los Comunes». La literatura pionera en este campo enfatizaba la necesidad de un marco regulatorio que superara esta tendencia hacia...

This paper investigates the role played by cooperation for the sustainable harvesting of an ecosystem. To achieve this, a bio-economic model based on a multi-species Gompertz dynamics with interspecific relationships and multi-agent catches is considered. A comparison between the non...

En este documento se estudian las variables ambientales, económicas y sociales de la ciénaga continental más grande de Colombia, Zapatosa. Este ecosistema está repartido entre dos departamentos (Cesar y Magdalena) y cinco municipios (Chimichagua, Tamalameque, El Banco, Chiriguaná y...

La explotación de recursos de uso común constituye la única fuente de ingresos de una porción significativa de hogares en países en desarrollo. El objetivo de este documento es mostrar empíricamente que cuando un recurso de uso común escasea, esto ocasiona un crecimiento demográfico tal...

This paper models the use of community sanctions to restrict effort in a simple Gordon-Shaefer style model of the fishery with heterogeneous fishing costs.

We present a continuous, nonlinear, stochastic and dynamic model for capital investment in the exploitation of a renewable resource. Both the resource stock and capital stock are treated as state variables. The resource owner controls fishing effort and the investment rate in an optimal way....

When every individual's effort imposes negative externalities, self-interested behavior leads to socially excessive effort. To curb these excesses when effort cannot be monitored, competing output-sharing partnerships can form. With the right-sized groups, aggregate effort falls to the socially...

Objective - This paper examines the business strategy at cut flower area. The need for cut flowers, especially chrysanthemums, is very large. The farmers of cut flowers are concentrated in Java, namely Malang, Bandungan, Yogyakarta and Cianjur in West Java.Methodology/Technique - In this study...