Native top-predator cannot eradicate an invasive fish from small pond ecosystems.

摘要: Pumpkinseed (Lepomis gibbosus) originates from North America and has been widely introduced in Europe where invasive populations have established. We tested the effectiveness of a biomanipulation approach based on stocking native top-predatory species, northern pike (Esox lucius), 23 small oligotrophic ponds at Pinail Nature Reserve (Vienne, France) among which 10 were stocked twice. In addition, 16 with similar environmental characteristics used as control no stocking. Our study revealed that, even limited space alternative prey did not eradicate pumpkinseed populations. Instead, we found that younger larger when reaching sexual maturity ponds, suggesting an increased growth rate predator. These results suggest invasion might adapt respond to management practices. changes likely driven by adaptation predation pressure and/or food availability reduced intraspecific competition. Importantly, such actually modify level invasiveness potential non-native lead counterproductive for managers.