“…The species tolerates a wide range of environmental pollutants including polycyclic aromatic hydrocarbons, endocrine‐disrupting compounds, radionuclide contaminants or nanoparticles (Maltby, 1991; O'Callaghan et al, 2019), and is able to accumulate heavy metals (Goodyear & McNeill, 1999). The gut microbiome is typically diverse and differs both at the individual and at the population level (Lafuente et al, 2023; Liao et al, 2023), with a considerable fraction of the gut microbes derived from environmental sources (Liao et al, 2023). We aimed to assess whether the bacterial component of the microbiome of A. aquaticus plays a role in coping with environmental pollution by so‐called micropollutants (MPs), including pesticides, pharmaceuticals, consumer products, and industrial chemicals, using faecal microbial transplants and fitness quantification of naïve juveniles.…”