Interactions of invasive pumpkinseed with a riverine endemic fish indicate trophic overlap but minimal consequences for somatic growth and condition

The North American invasive fish pumpkinseed Lepomis gibbosus has been associated with some detrimental ecological consequences in parts of its range. Here, we tested the trophic interactions endemic stream Aegean chub Squalius fellowesii (‘chub’) a Mediterranean-type water course SW Anatolia, Turkey, using bulk stable isotope approach (δ 13 C, δ 15 N). Seven sampling sites were able to be grouped as presence ( n = 2) and absence 3), 2). Across these groups, metrics revealed that (isotopic) niche size was similar presence/absence, but had larger presence. In where they are co-habited, their niches showed convergence, no apparent for growth or body condition, suggesting there minimal this sharing food resources. These results suggest riverine invasion on minimal.