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The present study assessed the metal genotoxicity potential at chromosome-level in the bivalve Ruditapes philippinarum collected along different areas of the Tagus estuary. Higher levels of aneuploidy on gill cells were detected at the most sediment contaminated area both in May (31.7%) and October (36.0%) when compared to a less contaminated area over the same periods (203% and 29.0% respectively). Interestingly, metal bioaccumulation in gills was higher in the specimens collected at the least contaminated area with the exception of Pb. Indeed, the multivariate analysis revealed a stronger relation between aneuploidy and sediment contamination than between aneuploidy and the bioaccumulation of the metals. The temporal and spatial inconsistency found for the bioaccumulation of metals in It philippinarum and the positive correlation between sediment contamination and aneuploidy at the most contaminated area suggest that these chromosome-level effects might be due to chronic metal contamination occurring in the Tagus estuary, rather than a direct result of the temporal variation of bioavailable contaminants. The vertical transmission phenomenon of bivalve aneuploidy levels may then be perpetuating those levels on clams from the most contaminated area. The present results shed light about the effect of metal toxicity at the chromosome-level in species inhabiting chronic contaminated areas and highlight the use of aneuploidy as an effective tool to identify persistent contamination in worldwide transitional waters. (C) 2016 Elsevier B.V. All rights reserved. Fundacao para a Ciencia e Tecnologia (FCT) project "ECOAPPROACH" [PTDC/AAC-AMB/121037/2010] FCT [SFRH/BPD/69563/2010] "Estrutura de Missao para a Extensao da Plataforma Continental" (EMEPC)

The Baixo Vouga Lagunar (BVL) is part of Ria de Aveiro coastal lagoon in Portugal, which is classified as a Special Protection Area under the European Habitats and Birds Directives. This part of the system, corresponding to the confluence of the Vouga River with the lagoon, is very important culturally and socioeconomically for the local communities, taking place several human activities, especially agriculture. To prevent salt water intrusion from the Ria de Aveiro into agriculture fields, a floodbank was initiated in the 90's. In frame of ongoing changes in Ria de Aveiro hydrodynamics, the existing floodbank will be now extended, introducing further changes in the ecological dynamics of the BVL and its adjacent area. As a consequence, the water level in the floodbank downstream side is expected to rise, increasing the submersion period in tidal wetlands, and leading to coastal squeeze. The aim of this study is to apply an ecosystem based-management approach to mitigate the impacts on biodiversity resulting from the management plan. To do so, we have modelled the implications of the changes in several hydrological and environmental variables on four saltmarsh species and habitats distribution, as well as on their associated ecosystem services, both upstream and downstream of the floodbank. The ecosystem services of interest were prioritized by stakeholders' elicitation, which were then used as an input to a spatial multi-criteria analysis aimed to find the best management actions to compensate for the unintended loss of biodiversity and ecosystem services in the BVL. According to our results, the main areas to be preserved in the BVL were the traditional agricultural mosaic fields; the freshwater courses and the subtidal estuarine channels. By combining ecology with the analysis of social preferences, this study shows how co-developed solutions can support adaptive management and the conservation of coastal ecosystems. © 2018 The Authors The European Commission under the Horizon 2020 Programme for Research, Technological Development and Demonstration supported this study through the collaborative research project AQUACROSS (Grant Agreement no. 642317 ). María Almagro was supported by the Juan de la Cierva Program (Grant IJCI-2015-23500 ). Ana I. Sousa was supported by the “ Fundação para a Ciência e a Tecnologia , I.P. (FCT)” Post-Doc grant SFRH/BPD/107823/2015 . Ana Genua-Olmedo was funded by the project PORBIOTA - Portuguese E-Infrastructure for Information and Research on Biodiversity (POCI-01-0145-FEDER-022127), financed by the “ Programa Operacional de Competitividade e Internacionalização ” and “Programa Operacional Regional de Lisboa, FEDER ”, and by the “ Fundação para a Ciência e a Tecnologia , I.P. (FCT)” through national funds (PIDDAC). Thanks are due by co-funding to Labex DRIIHM, French program “Investissements d'Avenir” ( ANR-11-LABX-0010 ) managed by the ANR, which funded the MARSH-C-LEVEL project. Thanks are also due, for the financial support to CESAM ( UID/AMB/50017 - POCI-01-0145-FEDER-007638 ), to FCT /MEC through national funds (PIDDAC), and the co-funding by the FEDER , within the PT2020 Partnership Agreement and Compete 2020.