I would like to know if there are recent studies on the estimation of microplastics floating globally and the predicted abundance in the Mediterranean surface waters (particles Km-2).
A paper has just recently been published by Mikaël Kedzierski and colleagues addressing this very topic:
Article Microplastics in Mediterranean Sea: A protocol to robustly a...
Similarly, I would recommend following the work of Jennifer F Provencher who is an expert on the current contamination issues with microplastics. Herself, along with Justine Ammendolia , Chelsea Rochman, and Mark L Mallory wrote an excellent paper addressing the impacts of plastics in aquatic food webs at a global scale:
Article Assessing plastic debris in aquatic food webs: what we know ...