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Now showing items 11-19 of 19
The South China Sea: analyzing fisheries catch data in an ecosystem context
Type: Journal Article
The South China Sea is an important fishing area with an annual harvest of some 5 million tonnes, or 10% of the catches jointly taken by the developing nations of the world. Details are given of a model of the area describing ...
Trophic models of aquatic ecosystems
Type: Conference Proceedings
A large proportion of the contributions to the ICES Theme Session on "Trophic models in aquatic ecosystems" is presented, together with papers of a number of scientists and very experienced ecosystem modellers.
Managing fisheries involving predator and prey species
Type: Journal Article
Several management strategies for ecosystems with biological interaction are discussed, including predator removal, predator-prey coexistence, prey exploitation, overexploitation, and introduction of sanctuaries. Some case ...
Fish production, catches and the carrying capacity of the world oceans
Type: Journal Article
A brief review of the status of the world fisheries is presented with emphasis on the differences between catches (= landings + bycatch), biological production of fish, and predation (= production - catches). The ECOPATH ...
Structuring dynamic models of exploited ecosystems from trophic mass-balance assessment
Type: Journal Article
The linear equations that describe trophic fluxes in mass-balance, equilibrium assessments of ecosystems (such as in the ECOPATH approach) can be re-expressed as differential equations defining trophic interactions as ...
Guide du logiciel ECOPATH II (version 2.1)
Type: Manual
This guide documents the use and background of the ECOPATH II software system written for MS DOS computers for straightforward construction and parametrization of steady-state trophic models of aquatic ecosystems. ECOPATH ...
Ecosystem maturity: towards quantification
Type: Journal Article
An attempt is made to rank 41 steady-state models of aquatic ecosystems on the basis of their maturity. Maturity is quantified using several of Odum's attributes of ecosystem maturity. It is shown that it is possible to ...
Emergy-based ascendency
Type: Journal Article
Ascendency is a system indicator used for describing flow characteristics of ecosystems. Experience shows, however, that ascendency is primarily a function of the flow characteristics at the lowest trophic levels. This is ...
On the behavior of some proposed goal functions for ecosystem development
Type: Journal Article
This contribution addresses the issue of "goal functions", quantifying the state of development of ecosystems. Numerous goal functions have been proposed with the hope that once a proper goal function has been identified ...