Mathieu Denoël, Laurane Winandy. Biological Conservation. Volume 192, In Progress (December 2015). Resilience of organisms after threat removal is an essential feature to justify conservation efforts. Amphibians are particularly threatened with a worldwide decline, showing a low resistance to invaders such as fish. Previous research has shown that they could recover after fish extirpation due to metamorphosed colonisers. However, not all amphibian phenotypes are able to persist fish introduction and disperse. In many species of newts and salamanders, paedomorphs retain gills in the adult stage, which makes them fully aquatic. Leer más.