Details

Autor(en) / Beteiligte

• Kalaentzis, Konstantinos
• Arntzen, Jan W.
• Avcı, Aziz
• Berg, Victor
• Beukema, Wouter
• France, James
• Olgun, Kurtuluş
• Riemsdijk, Isolde
• Üzüm, Nazan
• Visser, Manon C.
• Wielstra, Ben

Titel

Hybrid zone analysis confirms cryptic species of banded newt and does not support competitive displacement since secondary contact

Ist Teil von

• Ecology and evolution, 2023-09, Vol.13 (9), p.e10442-n/a

Ort / Verlag

Bognor Regis: John Wiley & Sons, Inc

Erscheinungsjahr

2023

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• When two putatively cryptic species meet in nature, hybrid zone analysis can be used to estimate the extent of gene flow between them. Two recently recognized cryptic species of banded newt (genus Ommatotriton) are suspected to meet in parapatry in Anatolia, but a formal hybrid zone analysis has never been conducted. We sample populations throughout the range, with a focus on the supposed contact zone, and genotype them for 31 nuclear DNA SNP markers and mtDNA. We determine the degree of genetic admixture, introgression, and niche overlap. We reveal an extremely narrow hybrid zone, suggesting strong selection against hybrids, in line with species status. The hybrid zone does not appear to be positioned at an ecological barrier, and there is significant niche overlap. Therefore, the hybrid zone is best classified as a tension zone, maintained by intrinsic selection against hybrids. While the two banded newt species can evidently backcross, we see negligible introgression and the pattern is symmetric, which we interpret as supporting the fact that the hybrid zone has been practically stationary since its origin (while extensive hybrid zone movement has been suggested in other newt genera in the region). Our study illustrates the use of hybrid zone analysis to test cryptic species status. Two recently recognized cryptic species of banded newt (genus Ommatotriton) are suspected to meet in parapatry in Anatolia, but a formal hybrid zone analysis has never been conducted. We sample populations throughout the range, with a focus on the supposed contact zone, and genotype them for 31 nuclear DNA SNP markers and mtDNA. We reveal an extremely narrow hybrid zone, suggesting strong selection against hybrids, in line with species status.