Long-Term Trends in Intertidal and Subtidal Benthic Communities in Response to Water Quality Improvement Measures |
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| Authors: | Paula Chainho Gilda Silva Michael F Lane José L Costa Tadeu Pereira Carla Azeda Pedro R Almeida Inês Metelo Maria J Costa |
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| Institution: | 1.Centro de Oceanografia,Faculdade de Ciências da Universidade de Lisboa,Lisbon,Portugal;2.Department of Biological Sciences,Old Dominion University,Norfolk,USA;3.Departamento de Biologia, Escola de Ciências e Tecnologia,Universidade de évora,évora,Portugal;4.Direc??o Municipal de Ambiente Urbano, Departamento do Ambiente e Espa?os Verdes, Divis?o de Controlo Ambiental,Camara Municipal de Lisboa,Lisbon,Portugal;5.Departamento de Biologia Animal,Faculdade de Ciências da Universidade de Lisboa,Lisbon,Portugal |
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| Abstract: | Long-term monitoring studies are needed to understand changes in ecosystem status when restoration measures are implemented.
A long-term data series (1996–2007) of the Tagus estuary (Portugal) intertidal and subtidal benthic communities was collected
in a degraded area where mitigation measures were implemented. Multivariate analysis was used to analyze spatial and temporal
patterns in benthic community composition and trends in five benthic community metrics (i.e., taxonomic richness, density,
biomass, Shannon–Wiener diversity and the AMBI index) were also examined. The results revealed a clear separation between
intertidal and subtidal assemblages, although they had 50% of taxa in common, including the most abundant. Significant positive
trends were found for all metrics showing that both intertidal and subtidal communities responded to the restoration measures
implemented. Nevertheless, biotic indices need some adaptation before being universally applied to intertidal and subtidal
habitats. |
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