Emergy, environ, exergy and ecological modelling

Jørgensen, Sven Erik; Nielsen, Søren Nors; Mejer, Henning

doi:10.1016/0304-3800(93)e0080-m

Cited by 221 publications

(144 citation statements)

References 9 publications

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“…Existing neo-classical economic approaches have been deemed inadequate by some to address current environmental policy needs (Cropper 2000) and new approaches for determining the value of nature have been necessary (Faber et al 2006;Boyd and Banzhaf 2007). Alternative non-monetary value metrics have emerged such as emergy, exergy, happiness, and life satisfaction (Jørgensen et al 1995 …”

Section: Valuation Of Ecosystem Servicesmentioning

confidence: 99%

A Review of the Elements of Human Well-Being with an Emphasis on the Contribution of Ecosystem Services

Summers

Smith

Case

et al. 2012

AMBIO

311

156

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Natural ecosystems perform fundamental lifesupport services upon which human civilization depends. However, many people believe that nature provides these services for free and therefore, they are of little or no value. While we do not pay for them, we pay significantly for their loss in terms of wastewater treatment facilities, moratoriums on greenhouse gases, increased illnesses, reduced soil fertility and losses in those images of nature that contribute to our basic happiness. Little is understood about the well-being benefits of the natural environment and its ecosystem services. The interwoven relationship of ecosystems and human well-being is insufficiently acknowledged in the wider philosophical, social, and economic well-being literature. In this article, we discuss an approach to examine human well-being and the interactions of its four primary elements-basic human needs, economic needs, environmental needs, and subjective wellbeing-and ecosystem services.

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Section: Valuation Of Ecosystem Servicesmentioning

confidence: 99%

A Review of the Elements of Human Well-Being with an Emphasis on the Contribution of Ecosystem Services

Summers

Smith

Case

et al. 2012

AMBIO

311

156

View full text Add to dashboard Cite

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“…From this expression it can be derived that (Jorgensen et al, 1995) an approximate estimation of exergy may be given by:…”

Section: R Foz Harbourmentioning

confidence: 99%

“…PII S0304-3800(97)00099-9 156 J.C. Marques et al/Ecological Modelling 102 (1997) [155][156][157][158][159][160][161][162][163][164][165][166][167] complementary. The method proposed by Jorgensen et al (1995) to estimate exergy, which takes into account the biomass of organisms and the thermodynamic information due to genes, appeared to be operational. There is nevertheless an obvious need for the determination of more accurate (discrete) weighing factors to estimate exergy from organisms biomass.…”

mentioning

confidence: 99%

Analysis of the properties of exergy and biodiversity along an estuarine gradient of eutrophication

Marques¹,

Pardal²,

Nielsen³

et al. 1997

Ecological Modelling

168

145

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Benthic eutrophication often gives origin to qualitative changes in marine and estuarine ecosystems, for example the shift in primary producers, often followed by changes in species composition and trophic structure at other levels. Through time such modifications may determine a selected new trophic structure. The development of structural dynamic models will allow to simulate such changes, using goal functions to guide ecosystem behaviour and development. The selection of other species and other food web may then be accounted by a continuous optimisation of model parameters according to an ecological goal function. Exergy has been applied in structural dynamic models of shallow lakes, and appears to be one of the most promising approaches. Theoretically, exergy is assumed to become optimised during ecosystems development, and ecosystems are supposed to self organise towards a state of an optimal configuration of this property. Exergy may then constitute not only a suitable system-oriented characteristic to express natural tendencies of ecosystems evolution, but also a good ecological indicator of ecosystems health. Biodiversity is also an important characteristic of ecosystems structure, constituting a powerful and traditional concept, which was found to be suitable to test the intrinsic ecological significance of exergy. We examined the properties of exergy (exergy and specific exergy) and biodiversity (species richness and heterogeneity) along an estuarine gradient of eutrophication, testing the hypothesis that they would follow the same trends in space and time. This hypothesis was validated in a certain extent, with exergy, specific exergy and species richness decreasing as a function of increasing eutrophication, but heterogeneity responding differently. Biodiversity measurements and their interpretation appeared subjective. Exergy and specific exergy may be a suitable alternative, that could be used as goal functions in ecological models and as holistic ecological indicators of ecosystems integrity. Nevertheless, since exergy and specific exergy showed to respond differently to ecosystems seasonal dynamics, it is advisable to use both * Corresponding author. TeL/fax: + 351 39 23603; e-mail: jcmimar@cygnus.ci.uc.pt 0304-3800/97/$17.00 © 1997 Elsevier Science B.V. All rights reserved. PII S0304-3800(97)00099-9 156 J.C. Marques et al./Ecological Modelling 102 (1997) [155][156][157][158][159][160][161][162][163][164][165][166][167] complementary. The method proposed by Jorgensen et al. (1995) to estimate exergy, which takes into account the biomass of organisms and the thermodynamic information due to genes, appeared to be operational. There is nevertheless an obvious need for the determination of more accurate (discrete) weighing factors to estimate exergy from organisms biomass. We propose to explore the assumption that the dimension of active genomes, which are primarily a function of the required genetic information to build up an organism, are proportional to the relative contents of DNA in di...

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“…Therefore exergy is not a state variable, as, for example, are both free energy and entropy. Exergy is often used as a goal function in ecosystem modelling, as an increase in its value is supposed to be connected with the presence of a higher ecosystem maturity (Jørgensen et al, 1995;Muller and Leupelt, 1998). In this paper, exergy is proposed as a global index, which can be used to estimate the state of the system in relation to fishing pressure.…”

Section: Methodsmentioning

confidence: 99%

Comparison between Artisanal Fishery and Manila Clam Harvesting in the Venice Lagoon by Using Ecosystem Indicators: An Ecological Economics Perspective

et al. 2004

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. Terms of use: Documents in Comparison between Artisanal Fishery and Manila Clam Harvesting in the Venice Lagoon by Using Ecosystem Indicators: An Ecological Economics Perspective SummaryArtisanal fishery in the Venice lagoon is a multi-target activity with a long tradition. It was the main fishing activity till the late '80s when, after the introduction and spread of the Manila clam (Tapes philippinarum), the mechanical clam harvesting started. A mass-balance model of the lagoon ecosystem was developed using the Ecopath with Ecosim software. 73 scenarios, obtained by changing the fishing effort of the two different types of fishery, were used to explore their impact on the ecosystem. A set of indicators was applied in order to compare the two fishing activities. The results obtained showed that the two activities are strongly interlinked, even through they don't exploit the same resources. The mechanical clam harvesting could reasonably be considered to be the driving force; it is capable of determining the state of lagoon ecosystem. The above mentioned factors create a lot of conflict between the two types of fishery.

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Emergy, environ, exergy and ecological modelling

Cited by 221 publications

References 9 publications

A Review of the Elements of Human Well-Being with an Emphasis on the Contribution of Ecosystem Services

A Review of the Elements of Human Well-Being with an Emphasis on the Contribution of Ecosystem Services

Analysis of the properties of exergy and biodiversity along an estuarine gradient of eutrophication

Comparison between Artisanal Fishery and Manila Clam Harvesting in the Venice Lagoon by Using Ecosystem Indicators: An Ecological Economics Perspective

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