Plastic pellets make Excirolana armata more aggressive: Intraspecific interactions and mortality in field and laboratory ecotoxicological assays

• Autor(a) principal: Izar, Gabriel Mendes
• Data de Publicação: 2022
• Outros Autores: Laurino, Ivan Rodrigo Abrão, Tan, Tjui-Yeuw [UNESP], Nobre, Caio Rodrigues [UNESP], Gusso-Choueri, Paloma Kachel [UNESP], Moreno, Beatriz Barbosa, Abessa, Denis Moledo de Souza [UNESP], Martinez, Sabrina Teixeira, da Rocha, Gisele Olímpio, Albergaria-Barbosa, Ana Cecília Rizzatti
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.marpolbul.2022.114325; http://hdl.handle.net/11449/249334
• topic: Ecological impacts; Ecotoxicology; Field experiments; Marine pollution; Microplastics; Sandy beaches

Microplastics, including plastic pellets, get stranded on sandy beaches. They persist in the oceans for long periods and frequently carry contaminants. Acute and chronic toxicity has been observed when marine organisms are exposed to high densities of plastic pellets in laboratory assays. We investigated the toxicity of beach-stranded plastic pellets on macrobenthic populations (Excirolana armata; Crustacea; Isopoda) under natural conditions (in situ). We simulated different pellets densities on a beach not contaminated by pellets, exposing isopods for 6 h and testing possible behavioral responses (i.e., vertical displacement) and mortality effects. No effect was observed on vertical displacement, but higher mortality was reported for organisms exposed to plastic pellets. The lowest pellet density tested commonly found in coastal areas was sufficient to trigger mortality. We also observed that lethargic individuals (near-death) were preyed on by the healthy individuals remaining in the test chambers.