Thus, future work should focus on the possible recombination of mitochondria during hybridization and a suspected hybrid origin for the GFC.
In the following, we discuss several lines of evidence for ancient hybridization with a special focus on diploids with hybrid origin.
Genomic in situ hybridization (GISH) studies could provide valuable insights regarding the putative hybrid origin of this species.
We also show that L. steindachneri is an ecotype of hybrid origin, suggesting that ecology plays a key role in species coexistence and hybridization.
Pelophylax esculentus, a species of hybrid origin between P. lessonae and P. ridibunda, is probably the best studied case of inter-specific hybridization [ 17].
Whether this reflects hybrid origins or secondary hybridization following speciation is unclear.
However, the spatial locations of nearly all putative F1 hybrids in contact zones between species points to interspecific hybridization as origin of genetically intermediate individuals.
These characteristics presumably reflect the origins of apogamous taxa – hybridization, recurrent origins and reticulate relationships [48] [51] – and they lead to recognition of non-monophyletic species on the gene-tree.
The consistent phylogenetic organization but genotypic divergence between the AD hybrid and haploid isolates supports the role of hybridization in the origin of the AD hybrid but also suggests ongoing independent evolutionary trajectories.
