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Title: Spatial distribution and bioaccumulation patterns in three clam populations from a low contaminated ecosystem
Author: Velez, Cátia
Figueira, Etelvina
Soares, Amadeu
Freitas, Rosa
Keywords: metals and metalloids
sediment contamination
shellfish consumption
health risk
elements partitioning
Issue Date: 2015
Publisher: Elsevier
Abstract: When consuming bivalves, special concern should be taken to the total element burden. In order to assess this issue the present study aimed to measure the element levels in the sediments of different harvesting areas and relate them with clam accumulation; to assess the elements body burden, their availability for trophic transfer and relate it with total accumulation in clams, comparing the native (Ruditapes decussatus and Venerupis corrugata) and the invasive (Ruditapes philippinarum) species; to evaluate the human risk associated with the consumption of different clam species. The results showed that the element burden in clams does not reflect the sediment contamination and BAF values were higher in the less contaminated areas. Comparison of Maximum Levels (MLs) from international organizations with the concentration of elements in clams showed that As exceeded standard levels. The ingestion of less than 1 Kg per week of clams would result in exceeding the PTWI threshold for As. Furthermore, the results showed that, when comparing to other elements, As and Hg are more easily available to be transferred trophically.
Peer review: yes
DOI: 10.1016/j.ecss.2015.01.004
ISSN: 0272-7714
Appears in Collections:CESAM - Artigos
DBio - Artigos

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