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Now showing items 21-24 of 24
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 ...
Primary production required to sustain global fisheries
Type: Journal Article
The 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 ...
Towards quantification of ecological sustainability in farming systems analysis
Type: Journal Article
A tentative list of ecological attributes; diversity, cycling, stability and capacity, is proposed for quantification and ranking of farming systems along a hypothetical scale of increasing ecological sustainability. The ...
Competition between fisheries and marine mammals for prey and primary production in the Pacific Ocean
Type: Journal Article
The 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 ...