Revista de Gestão Costeira Integrada
Volume 13, Número 2, Junho 2013, Páginas 169-179

DOI: 10.5894/rgci395
* Submission: january 21, 2013; Evaluation: february 23, 2013; Reception of revised manuscript: march 8, 2013; Accepted: april 28, 2013; Available on-line: may 10, 2013.

Local marine litter survey - A case study in Alcobaça municipality, Portugal*

Levantamento de lixo marinho local – Um caso de estudo no município de Alcobaça, Portugal

João P. G. L. Frias ^{@, 1}, Joana C. Antunes ¹, Paula Sobral ¹

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@ - Corresponding author
1 - IMAR – Instituto do Mar, Departamento de Ciências e Engenharia do Ambiente, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829–516 Caparica, Portugal.
E-mail: jpfrias@fct.unl.pt (J.P. Frias)

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ABSTRACT
Beach clean-ups campaigns organized by Coastwatch, Geota, are a common annually practice in the Portuguese coastal area. Bearing in mind the goals and objectives of the Marine Strategy Framework Directive (2008/56/EC) (MSFD), the Institute of Marine Research (IMAR FCT-UNL), in Faculty of Sciences and Technology of Universidade Nova de Lisboa participated for the first time in this project with the aim of collecting data about the state of coastal marine plastic pollution.
A close collaboration with Alcobaça municipality and with local teachers and students was set up, in order to gather information about marine plastic debris in this region. Three beaches were surveyed – Paredes de Vitória, Légua and Gralha – for number and mass (g) of plastic debris; and for concentrations of persistent organic pollutants (POP in ng g-1) adsorbed to plastic pellets. Paredes de Vitória beach had highest number of items (5200) and mass (886 g). No concerning concentrations of POP were found for Alcobaça municipality beaches, when compared with other beaches in Portugal and worldwide. White, aged and coloured pellets showed higher values of tDDT when compared to the data from 2009 and 2012, confirming the high persistence of this pesticide in the environment. Studies such as these are important, not only to gather information about stranded marine litter on the Portuguese coast, as a contribution to the goals Marine Strategy Framework Directive (MSFD), but also to promote environmentall awareness in society from young ages, on the issues of marine litter.

Keywords: microplastics, PAH, PCB, DDT, POP, PBTC, marine debris, Portugal.

RESUMO
As campanhas de limpeza de praia organizadas pelo Coastwatch - Geota, são prática comum anual na zona costeira portuguesa. Tendo presentes os objectivos da Directiva Quadro Estratégia Marinha (2008/56/EC) (DQEM), o Instituto do Mar, pólo da Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa (IMAR FCT-UNL) participou pela primeira vez neste projecto com o intuito de recolher informação acerca do estado da poluição marinha costeira por plásticos. Uma colaboração através da Câmara Municipal de Alcobaça foi estabelecida com escolas do município, com o intuito de recolher informação acerca dos detritos plásticos marinhos nesta região. Foram investigadas três praias – Paredes de Vitória, Légua e Gralha quanto ao número e massa (g) de detritos; e quanto à concentração de poluentes orgânicos persistentes (POP em ng g-1) adsorvidos às pastilhas de plástico (pellets). A praia de Paredes de Vitória foi aquela que apresentou um maior número de itens recolhidos (5200) e maior massa (886 g) das três praias amostradas. Não foram encontrados valores preocupantes de POP nas praias do município de Alcobaça, quando comparados com outras praias em Portugal e no mundo. Pellets brancos, envelhecidos e coloridos apresentam maiores valores de tDDT quando comparados com literatura de 2009 e 2012, confirmando a elevada persistência deste pesticida no ambiente. Estudos como este são importantes não apenas pela recolha de informação do estado de costa que reflecte a realidade do país, mas também pela possibilidade de fomentar uma consciencialização ambiental na sociedade desde as camadas mais jovens, ao mesmo tempo que contribuem para a Directiva Quadro Estratégia Marinha (DQEM).

Palavras-chave: Microplásticos, PAH, PCB, DDT, POP, PBTC, detritos marinhos, Portugal.

 

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