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    Propensity to metal accumulation and oxidative stress responses of two benthic species (Cerastoderma edule and Nephtys hombergii): are tolerance processes limiting their responsiveness?

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    Marques et al 2015 Ecotoxicology.pdf
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    Type
    Article
    Authors
    Marques, Ana
    Piló, David
    Araújo, Olinda
    Pereira, Fábio
    Guilherme, Sofia
    Carvalho, Susana cc
    Santos, Maria Ana
    Pacheco, Mário
    Pereira, Patrícia
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Red Sea Research Center (RSRC)
    Date
    2016-02-24
    Online Publication Date
    2016-02-24
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/606859
    
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    Abstract
    The chronic exposure of benthic organisms to metals in sediments can lead to the development of tolerance mechanisms, thus diminishing their responsiveness. This study aims to evaluate the accumulation profiles of V, Cr, Co, Ni, As, Cd, Pb and Hg and antioxidant system responses of two benthic organisms (Cerastoderma edule, Bivalvia; Nephtys hombergii, Polychaeta). This approach will provide clarifications about the ability of each species to signalise metal contamination. Organisms of both species were collected at the Tagus estuary, in two sites with distinct contamination degrees (ALC, slightly contaminated; BAR, highly contaminated). Accordingly, C. edule accumulated higher concentrations of As, Pb and Hg at BAR compared to ALC. However, antioxidant responses of C. edule were almost unaltered at BAR and no peroxidative damage occurred, suggesting adjustment mechanisms to the presence of metals. In contrast, N. hombergii showed a minor propensity to metal accumulation, only signalising spatial differences for As and Pb and accumulating lower concentrations of metals than C. edule. The differences in metal accumulation observed between species might be due to their distinctive foraging behaviour and/or the ability of N. hombergii to minimise the metal uptake. Despite that, the accumulation of As and Pb was on the basis of the polychaete antioxidant defences inhibition at BAR, including CAT, SOD, GR and GPx. The integrated biomarker response index (IBRv2) confirmed that N. hombergii was more affected by metal exposure than C. edule. In the light of current findings, in field-based studies, the information of C. edule as a bioindicator should be complemented by that provided by another benthic species, since tolerance mechanisms to metals can hinder a correct diagnosis of sediment contamination and of the system’s health. Overall, the present study contributed to improve the lack of fundamental knowledge of two widespread and common estuarine species, providing insights of the metal accumulation profiles under a scenario of chronic contamination. Finally, this work provided useful information that can be applied in the interpretation of future environmental monitoring studies.
    Citation
    Propensity to metal accumulation and oxidative stress responses of two benthic species (Cerastoderma edule and Nephtys hombergii): are tolerance processes limiting their responsiveness? 2016, 25 (4):664 Ecotoxicology
    Sponsors
    This work was supported by CESAM (UID/AMB/50017) and “Fundação para a Ciência e a Tecnologia” (FCT/MEC; Government of Portugal) through national funds, and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020, through the Research Project PTDC/AAC-AMB/121037/2010, the Investigation Fellowship (BI/CESAM/PTDC/AAC-AMB/121037/2010; Ana Marques), and the Post-doctoral fellowships SFRH/BPD/69563/2010 (Patrícia Pereira) and SFRH/BPD/88947/2012 (Sofia Guilherme).
    Publisher
    Springer Nature
    Journal
    Ecotoxicology
    DOI
    10.1007/s10646-016-1625-y
    PubMed ID
    26911481
    Additional Links
    http://link.springer.com/10.1007/s10646-016-1625-y
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10646-016-1625-y
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC)

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