Editing Northern crested newt (section)

== Population structure, speciation, and phylogeny ==

=== Hybridization ===
In certain areas of France, the northern crested newt and the [[marbled newt]] overlap, and hybrids are present. As the northern crested newt's population grows, and marbled newt population struggles, these hybrids have been shown to possess good qualities of both. They have more fecundity than the two newts however have a hard time keeping their eggs alive.<ref>{{Cite journal |last1=Arntzen |first1=J. W. |last2=Hedlund |first2=Linda |date=December 1990 |title=Fecundity of the newts Triturus cristatus, T. marmoratus and their natural hybrids in relation to species coexistence |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1600-0587.1990.tb00625.x |journal=Ecography |language=en |volume=13 |issue=4 |pages=325–332 |doi=10.1111/j.1600-0587.1990.tb00625.x |bibcode=1990Ecogr..13..325A |issn=0906-7590|url-access=subscription }}</ref>