Browsing by Author "Christensen, V."
Now showing items 1-20 of 26
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A draft guide to the ECOPATH II program (ver. 1.0)
(1990)Type: ManualThis guide documents the use and background of a program written for MSDOS Computers, in QUICKBASIC 4.5, for straightforward construction and parametrization of steady-state trophic models of aquatic ecosystems. The ECOPATH ... -
A guide to ECOPATH II software system (version 2.0)
(1991)Type: ManualThis 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 ... -
A guide to the ECOPATH II software system (version 2.1)
(1992)Type: ManualThe software described in the present guide is designed to help user construct a simple model of an aquatic ecosystem. -
A trophic ecosystem model of Lake George, Uganda
(1993)Type: Book ChapterA trophic model of Lake George, Uganda, Central Africa was constructed using published quantitative and qualitative information on the various biotic components of the lake and the ECOPATH II approach and software. It is ... -
Assessment, management and future directions for coastal fisheries in Asian countries
(2003)Type: Conference ProceedingsIn Asia, the fisheries sector is important in terms of food security, livelihoods and foreign exchange earnings. However, as in many parts of the world, there are signs that capture fisheries are fully exploited or overfished. ... -
Changes in models of aquatic ecosystems approaching carrying capacity
(1998)Type: Journal ArticleUsing a top-down modeling approach, published mass-balance models of trophic interactions and state variables in the western central Pacific Ocean and the northern Gulf of Mexico shelf were used to explore how large increases ... -
Competition between fisheries and marine mammals for prey and primary production in the Pacific Ocean
(1997)Type: Journal ArticleThe degree of competition between fisheries and marine mammals in the Pacific Ocean was estimated for 7 statistical areas defined by the Food and Agriculture Organization of the United Nations (FAO). Catch statistics ... -
Diet composition and trophic levels of marine mammals
(1998)Type: Journal ArticleStandardized diet compositions were derived for 97 species of marine mammals from published accounts of stomach contents as well as from morphological, behavioural and other information. Diet was apportioned among eight ... -
Ecosystem maturity: towards quantification
(1995)Type: Journal ArticleAn 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
(1994)Type: Journal ArticleAscendency 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 ... -
Fish production, catches and the carrying capacity of the world oceans
(1995)Type: Journal ArticleA 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 ... -
Fisheries impact on the South China Sea large marine ecosystem: a preliminary analysis using spatially-explicit methodology
(2003)Type: Conference ProceedingsA multiple regression model is derived, based on biomass estimates in 16 massbalance food web (Ecopath) models, which explains 68 % of the variation in the data at hand, and shows that the abundance of fish with trophic ... -
Flow characteristics of aquatic ecosystems
(1993)Type: Book ChapterThis contribution examines various flow measures based on analysis of 41 quantified models of trophic interactions in aquatic ecosystems. -
Flow modelling with ECOPATH: providing insights on the ecological state of agroecosystems
(1997)Type: Book ChapterThis paper summarizes the major findings in modelling and analysing agroecosystems using ECOPATH. -
Guide du logiciel ECOPATH II (version 2.1)
(1992)Type: ManualThis 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 ... -
Managing fisheries involving predator and prey species
(1996)Type: Journal ArticleSeveral management strategies for ecosystems with biological interaction are discussed, including predator removal, predator-prey coexistence, prey exploitation, overexploitation, and introduction of sanctuaries. Some case ... -
On ECOPATH, Fishbyte and fisheries management
(1991)Type: Journal ArticleA brief account of the origin and basic assumptions of the ECOPATH software and approach is given, with emphasison their documentation in Fishbyte, and to the transition to its successor, the ECOPATH II program. Some ... -
On the behavior of some proposed goal functions for ecosystem development
(1994)Type: Journal ArticleThis 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 ... -
Primary production required to sustain global fisheries
(1995)Type: Journal ArticleThe mean of reported annual world fisheries catches for 1988-1991 (94.3 million t) was split into 39 species groups, to which fractional trophic levels, ranging from 1.0 (edible algae) to 4.2 (tunas), were assigned, based ... -
Stratified models of large marine ecosystems: a general approach and an application the South China Sea
(1993)Type: Book ChapterThis contribution provides an approach for constructing models of large marine ecosystems (LMEs). This contribution results from an attempt to follow up on some of the implications of the LME concept for ecological modeling, ...
