Approved Abstracts

Do climate change related factors modify the response of Mytilus galloprovincialis to lanthanum? The case of temperature increases.



Author(s): Andrade M; Soares AMVM; Solé M; Pereira E; Freitas R;
Presenter: Madalena Andrade

In the last century, the fast technological development and industrialization accompanied by a substantial increase in luxurious lifestyles had led to the generation of high amounts of electrical and electronic equipment waste (e-waste). Alongside, this type of equipment has experienced a decrease in lifespan, while humans are progressively adopting a fast replacement of equipment gear. However, handling, disposal and recycling of the e-waste generated is still improper, leading to an alarming e-waste growth during the last years, and to the release of its different constitutive elements into the aquatic systems, where concentrations up to several µg/L have already been recorded. One of the most important components of e-waste are the rare-earth elements (REEs), used especially due to their unique physical and chemical properties. Among the REEs, Lanthanum (La) is commonly used in different electronics and optoelectronics specially to produce luminophores, lasers, catalysts, metal alloys, batteries and communication devices. Alongside with the impacts caused by pollutants, organisms in coastal ecosystems are also facing environmental changes as those related with CC scenarios. These changes are likely to affect organism’s sensitivity to pollutants as well as pollutants toxicity. Global ocean temperature has increased by 0.76°C since the industrial revolution with a projection of a further rise of 1-4°C by 2100. Within this context, the present study aims to understand the influence of temperature on the impacts induced by La in the Mediterranean mussel Mytilus galloprovincialis, a widely used sentinel species as well as a species of high commercial interest. Organisms were exposed to La (0 and 10 ug/L) each concentration at two different temperatures (17 and 22ºC), for 28 days and several biomarkers related to metabolism (electron transport system activity and energy reserves content), oxidative stress (cellular damage and antioxidant and biotransformation enzymes) and neurotoxicity (acetylcholinesterase activity) were evaluated. Furthermore, the concentration of La in the exposed medium and organisms’ tissues were also quantified. Results showed that mussels accumulated La from the medium with no differences between the two temperatures at each condition. The exposure to La led to a decrease of mussels metabolic capacity as a possible defense behavior to avoid La accumulation, accompanied by an increase of the activity in the biotransformation enzymes possibly to prevent cellular damage from the exposure. However, as antioxidant defenses were not activated or even decreased possibly due to the reduction of the overall metabolism, mussels were not able to avoid cellular damage. At increased temperature the impacts of La followed the same pattern but were more accentuated, with the lowest metabolic capacity and the highest glycogen content in those exposed the combination of La presence and temperature rise. Under this last condition, although biotransformation defenses were activated, the activity of antioxidant enzymes was lower compared with La and 21 ºC treatments acting alone, and an increase on mussels’ cellular damage was observed. Overall, this study highlights the need to perform environmental risk assessment studies, by considering the presence and impacts of emerging contaminants at relevant concentrations at present and forecasted climate change scenarios. This work had been benefited from National Funds through the Portuguese Science Foundation (Fundação para a Ciência e a Tecnologia, FCT) through a PhD grant as well as financial support from REQUIMTE and CESAM (UIDB/50006/2020 and UIDB/50017/2020+UIDP/50017/2020) and RED RIESCOS - Evaluación de los Efectos de los Contaminantes Emergentes en Organismos Acuáticos y sobre la Salud Humana, from the Programa Iberoamericano de Ciencia y Tecnología para el Desarrollo (CYTED) with reference 419RT0578.

Keywords: Lanthanum; Temperature increase; Oxidative Stress

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