A closer look at anthropogenic fiber ingestion in Aristeus antennatus in the NW Mediterranean Sea: Differences among years and locations and impact on health condition

Catégorie : Impacts de la Pollution Plastique
Date :29 juin 2020
Avis TSC : Les effets de la pollution par les microplastiques présentent de multiples facettes. Les auteurs ont montré dans cette étude que les microparticules ont peu d’effet sur la santé des crevettes. Toutefois, ils ont observé un impact sur les glandes génitales dont l’activité cellulaire a été modifiée. L’origine de cet effet est à rechercher dans les résultats des études en cours sur les perturbateurs endocriniens. En effet, plusieurs familles d’additifs sont suspectées d’avoir ce genre d’effet et certaines ont été interdites. Malheureusement, la durée de vie des matières plastiques est telle que leur persistance dans le milieu naturel est très longue et donc la diffusion de ces molécules d’additifs perdure pendant des années après l’interdiction. La pollution par les microplastiques a le mérite de nous souligner toute l’étendue du problème qui au final va impacter notre santé en même temps que celle des écosystèmes.
Carreras-Colom, Ester; Constenla, María; Soler-Membrives, Anna; Cartes, Joan E.; Baeza, Mireia; Carrassón, Maite.
Environmental Pollution: 263, 114567, (2020).
Marine litter is one of the most concerning threats for marine wildlife especially regarding plastics and their micro-sized forms, widely known as microplastics. The present study evaluates mesoscale spatial (230 km, Catalan coast) and temporal (2007 vs 2017-2018, Barcelona area) differences on the ingestion of anthropogenic fibers in the deep-sea shrimp Aristeus antennatus in the NW Mediterranean Sea and its relation with shrimp’s health condition. Synthetic fibers with lengths ranging between 0.16 and 37.9 mm were found in both stomach (where sometimes they were tangled up in balls) and intestine contents. The percentage of fiber occurrence was >65% at each sampling point. Tangled balls of fibers observed in stomach contents exhibited a wide range of sizes (up to a diameter of 1 cm) and were usually composed of fibers of different polymers, sizes and colors. Differences between locations (2018) were found, with greater fiber loads towards the south during spring and a great variability in summer, as shrimps caught off Barcelona showed a nearly thirty-times higher fiber load compared to shrimps from other localities. Highest concentrations were more likely to be related to major sources of fibers and currents in the area. Fiber load in shrimps from 2007 was comparable to that of shrimps captured in 2017 and 2018 (spring) yet a shift in the proportion of acrylic and polyester polymers was detected. No consistent effect on shrimp’s health condition was found, with only a significant negative correlation found between gonadosomatic index and fibers for those shrimps with the highest values of fiber load (caught off Barcelona, summer 2018). Our findings contribute to the knowledge on plastic pollution for the NW Mediterranean Sea and highlight the potential use of this species as a sentinel species for plastic fiber contamination.