Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams

Detalhes bibliográficos
Autor(a) principal: Chaves, Maria Luísa Correia, 1975-
Data de Publicação: 2008
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10451/1567
Resumo: Tese de doutoramento em Biologia (Ecologia), apresentada à Universidade de Lisboa através da Faculdade de Ciências, 2008
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spelling Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streamsEcologiaTeses de doutoramento - 2008Tese de doutoramento em Biologia (Ecologia), apresentada à Universidade de Lisboa através da Faculdade de Ciências, 2008Macroinvertebrates have become the most commonly used and widely known biological indicators for assessing and monitoring human impacts in streams because they respond predictably to many kinds/intensities of anthropogenic pressures. Hence, they were included in the indicators group of ecological status required by the Water Framework Directive (WFD). However, the lack of understanding about natural spatio-temporal variations of macroinvertebrate communities and the lack of taxa lists for many undisturbed lotic systems most certainly hinder streams condition bioassessment, the successful restoration of the natural structural and functional integrity of an ecosystem, and the prediction of climate change impact on freshwater biodiversity. Spatio-temporal dynamics of undisturbed macroinvertebrate communities of the Mondego River basin (MRb) were analysed showing a strong variation both spatially and temporally. These variations were regulated through a multiplicity of factors operating at local [substrate type and hydraulic conditions (current speed, dissolved oxygen)] and larger spatial scales [streambed geology (inferred by conductivity), altitude and channel width]. Seasonal variation of these communities was more similar to that in other Mediterranean streams rather than that in northern temperate Portuguese streams, where seasonality is not as evident. Physical stream types of the MRb (based on the WFD system-B national typology) were tested for biological meaning and showed significant relevance for macroinvertebrates. However, spatial and temporal heterogeneity of abiotic conditions might hinder bioassessment since temporal variations and intermittency do not seem to be incorporated in typology results. Particular emphasis was given to high altitude intermittent streams (above 1400 m a.s.l.), where new chironomid species records were found for continental Portugal and the Iberian Peninsula and the loss of macroinvertebrate biodiversity is expected to occur based on climate change predictions. Also, a protocol to help selecting near-natural stream sites was developed and tested. Finally, the present work raised the need for long term studies, for more information concerning intermittent streams, for molecular studies to solve and complement the lack of taxonomical knowledge and for cross-linking reference conditions and climate change.Fundação para a Ciência e Tecnologia e ESF no âmbito do III Quadro Comunitário de Apoio pela a atribuição da bolsa individual SFRH/BD/6365/2001.Costa, Maria José Rosado, 1947-Prat i Fornells, Narcís, 1950-Repositório da Universidade de LisboaChaves, Maria Luísa Correia, 1975-2010-07-27T08:59:34Z20082008-01-01T00:00:00Zdoctoral thesisinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdftext/xmlhttp://hdl.handle.net/10451/1567enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T12:39:33Zoai:repositorio.ulisboa.pt:10451/1567Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T02:25:05.650984Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
title Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
spellingShingle Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
Chaves, Maria Luísa Correia, 1975-
Ecologia
Teses de doutoramento - 2008
title_short Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
title_full Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
title_fullStr Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
title_full_unstemmed Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
title_sort Spatio-temporal dynamics of undisturbed macroinvertebrate communities in the Mondego River basin : contribution to the ecological assessment of streams
author Chaves, Maria Luísa Correia, 1975-
author_facet Chaves, Maria Luísa Correia, 1975-
author_role author
dc.contributor.none.fl_str_mv Costa, Maria José Rosado, 1947-
Prat i Fornells, Narcís, 1950-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Chaves, Maria Luísa Correia, 1975-
dc.subject.por.fl_str_mv Ecologia
Teses de doutoramento - 2008
topic Ecologia
Teses de doutoramento - 2008
description Tese de doutoramento em Biologia (Ecologia), apresentada à Universidade de Lisboa através da Faculdade de Ciências, 2008
publishDate 2008
dc.date.none.fl_str_mv 2008
2008-01-01T00:00:00Z
2010-07-27T08:59:34Z
dc.type.driver.fl_str_mv doctoral thesis
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/1567
url http://hdl.handle.net/10451/1567
dc.language.iso.fl_str_mv eng
language eng
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instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
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reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
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