Habitat overlap and body condition in aquatic turtles: are there additive effects between invasive and native species?

Trachemys scripta (Reptilia, Emydidae) is among the most widespread invasive reptiles in world. In general, it assumed that this species has negative effects on native aquatic turtles based experiments conducted under controlled conditions. Here, we analysed a 7?year time series (2013?2019) of data from captures three (two natives and one alien) natural populations northeastern Iberian Peninsula. We evaluated (i) interspecific spatial overlap (ii) correlation between scaled mass index (SMI) abundance T. , including an interaction effect species. The analyses revealed relatively low with Emys orbicularis but high Mauremys leprosa . Overall, was not associated significant variations SMI species, although for female E. detected trend. also indicated does have additive other turtles, even if there These findings suggested impact could be density-dependent.