Persistent dominance of non-indigenous species in the inner part of a marina highlighted by multi-year photographic monitoring

As a result of urbanization, coastal environments are being disturbed by various anthropogenic pressures. These concentrated in harbor areas where the addition artificial structures and presence pollutants seems to favor settlement non-indigenous species. Most studies on these organisms often carried out single time window without integrating temporal variability. Here, we analyzed multi-year photographic data marina communities taken from 3 experiments conducted between 2016 2019 same marina. photographs were recruitment plates placed at inner, middle entrance locations marina, permitting us discern community differences distribution taxa locations. Over entire study period, that grew inner always different. Non-indigenous also appeared be more prevalent location Our results suggest different environmental filters could explain observations. We this due pollution gradient, with high competitive pressure exerted tunicate Ciona intestinalis entrance.