In water with the enemy! A Lissotriton vulgaris (Amphibia: Salamandridae) paedomorph living together with the non-native fish, Perccottus glenii (Pisces: Adontobutidae) in Romania.
Paedomorphosis is a rare phenomenon, with remarkable evolutionary and conservative implications. Paedomorphic newts are sensitive to different threats, invasive fish eliminating many populations. In spite of this, in March 2016 we identified in southwestern Romania a Lissotriton vulgaris paedomorphic female, together not only with fish, but with the invasive fish Perccottus glenii, known as a great danger for newts. This is the eighth record of paedomorphic newts in Romania, and the first in the Banat region. The habitat was an artificial channel surrounded by agricultural plain areas. The paedomorhic female's dimension, colour and cloacal shape were as in adult metamorphs. Probably in the region P. glenii did not yet succeed to eliminate paedomorphic or metamorphic newts. If in other areas P. glenii had this effect, it is hard to believe that something from south-western Romania will succeed to modify the result of this interaction.