Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/5385 https://doi.org/10.1016/j.energy.2004.03.051 |
Resumo: | Holistic indicators such as exergy and ascendency have been widely employed to assess the health of ecosystems given by their structure, function and organization. In this study we calculate the exergy, specific exergy and ascendency for the microbenthic loop that represents a major sub-system within the marine food chain. The analysis of the microbenthic loop investigated in terms of organic matter, bacteria, microphytobenthos and meiofauna reflected changes occurring in the trophic state of benthic ecosystems and provided a tool for comparison between different environments. Temporal and spatial variability of the holistic indicators were evaluated using benthic measures collected at different times for different environments in the Mediterranean Sea. Exergy was strongly correlated with the organic contents of the sediments, and did not provide a useful description of the investigated system. In contrast, specific exergy resulted related to the microbenthic loop structure and complexity while Ascendency mostly reflected its activity and organization. Temporal analysis showed that in natural ecosystems specific exergy and ascendency showed convergence and follow similar seasonal trends. On the contrary in strongly eutrophicated systems an uncoupling between the two indicators occurred indicating a malfunctioning of the microbenthic loop that become strongly dissipative. |
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Temporal and spatial change of exergy and ascendency in different benthic marine ecosystemsHolistic indicators such as exergy and ascendency have been widely employed to assess the health of ecosystems given by their structure, function and organization. In this study we calculate the exergy, specific exergy and ascendency for the microbenthic loop that represents a major sub-system within the marine food chain. The analysis of the microbenthic loop investigated in terms of organic matter, bacteria, microphytobenthos and meiofauna reflected changes occurring in the trophic state of benthic ecosystems and provided a tool for comparison between different environments. Temporal and spatial variability of the holistic indicators were evaluated using benthic measures collected at different times for different environments in the Mediterranean Sea. Exergy was strongly correlated with the organic contents of the sediments, and did not provide a useful description of the investigated system. In contrast, specific exergy resulted related to the microbenthic loop structure and complexity while Ascendency mostly reflected its activity and organization. Temporal analysis showed that in natural ecosystems specific exergy and ascendency showed convergence and follow similar seasonal trends. On the contrary in strongly eutrophicated systems an uncoupling between the two indicators occurred indicating a malfunctioning of the microbenthic loop that become strongly dissipative.http://www.sciencedirect.com/science/article/B6V2S-4CC7RP3-D/1/49cf1c6b40bddddc9a3bb98c5072e51f2004info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5385http://hdl.handle.net/10316/5385https://doi.org/10.1016/j.energy.2004.03.051engEnergy. 29:11 (2004) 1697-1712Fabiano, M.Vassallo, P.Vezzulli, L.Salvo, V. S.Marques, J. C.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2020-11-06T16:49:02Zoai:estudogeral.uc.pt:10316/5385Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:38.808981Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
title |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
spellingShingle |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems Fabiano, M. |
title_short |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
title_full |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
title_fullStr |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
title_full_unstemmed |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
title_sort |
Temporal and spatial change of exergy and ascendency in different benthic marine ecosystems |
author |
Fabiano, M. |
author_facet |
Fabiano, M. Vassallo, P. Vezzulli, L. Salvo, V. S. Marques, J. C. |
author_role |
author |
author2 |
Vassallo, P. Vezzulli, L. Salvo, V. S. Marques, J. C. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Fabiano, M. Vassallo, P. Vezzulli, L. Salvo, V. S. Marques, J. C. |
description |
Holistic indicators such as exergy and ascendency have been widely employed to assess the health of ecosystems given by their structure, function and organization. In this study we calculate the exergy, specific exergy and ascendency for the microbenthic loop that represents a major sub-system within the marine food chain. The analysis of the microbenthic loop investigated in terms of organic matter, bacteria, microphytobenthos and meiofauna reflected changes occurring in the trophic state of benthic ecosystems and provided a tool for comparison between different environments. Temporal and spatial variability of the holistic indicators were evaluated using benthic measures collected at different times for different environments in the Mediterranean Sea. Exergy was strongly correlated with the organic contents of the sediments, and did not provide a useful description of the investigated system. In contrast, specific exergy resulted related to the microbenthic loop structure and complexity while Ascendency mostly reflected its activity and organization. Temporal analysis showed that in natural ecosystems specific exergy and ascendency showed convergence and follow similar seasonal trends. On the contrary in strongly eutrophicated systems an uncoupling between the two indicators occurred indicating a malfunctioning of the microbenthic loop that become strongly dissipative. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/5385 http://hdl.handle.net/10316/5385 https://doi.org/10.1016/j.energy.2004.03.051 |
url |
http://hdl.handle.net/10316/5385 https://doi.org/10.1016/j.energy.2004.03.051 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Energy. 29:11 (2004) 1697-1712 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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