Encontrados 5 documentos, a visualizar página 1 de 1
Ecological indicators performance during a re-colonisation field experiment and...
Patrício, Joana; Salas, Fuensanta; Pardal, Miguel Ângelo; Jørgensen, Sven Erik; Marques, João CarlosThrough a re-colonisation field experiment three main questions were approached: (1) How do different ecological indicators react during the process of recovery? (2) What does grow first during a community succession, biomass or complexity? (3) Can the chosen ecological indicators help in recognising the three proposed forms of growth: biomass, network and information, throughout re-colonisation? ; http://ww...
Calculations of exergy for organisms
Jørgensen, Sven Erik; Ladegaard, Niels; Debeljak, Marko; Marques, João CarlosExergy estimations based on biomass and information for organisms can with good approximation be found as: Ex = [beta]c, where c is the concentration of biomass and [beta] the weighting factor, that accounts for the information that the organisms carry [Jørgensen, S.E., 2002. Integration of Ecosystem Theories: A Pattern, vol. 432, 3rd ed. Kluwer Academic Publishing Company, Dordrecht, The Netherlands]. The dete...
Modelling the effects of different quality prey fish species and of food supply...
Martins, Irene; Pereira, José Costa; Ramos, Jaime A.; Jörgensen, Sven ErikWe assessed the effects of different quality fish species and reductions in their abundance in the growth of Roseate Tern (Sterna dougallii) chicks in the Azores. An energetic balance model was developed, which accounts for the energy available from ingested fishes and the energy expenditure by the chicks. Fish species ingested by Roseate Tern chicks were mainly Trachurus picturatus, Scomberesox saurus, Macrora...
Three selected ecological observations interpreted in terms of a thermodynamic ...
Marques, João Carlos; Jørgensen, Sven ErikBiology and ecology are, in many ways, lacking universal laws and predictive theory, and most biologists and ecologists have been feeling the need for a more general and integrative theoretical network that may help in explaining their observations and experimental results. Thermodynamics has been widely applied in ecosystem theory since input, output, and cycling of mass and energy constitute the basis of ecol...
Structural changes in an estuary, described by models and using exergy as orientor
Jørgensen, Sven Erik; Marques, João; Nielsen, Søren NorsIt is often of interest to determine which structure of an ecosystem among the possible ones will prevail under given environmental circumstances. The authors show that it is feasible using models and an exergy index. The hypothesis is that the structure giving the highest exergy will prevail. The exergy calculations are however still very uncertain, which implies that a clear difference in exergy must be requi...
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