AI Article Synopsis

  • The study investigates the taxonomy and distribution of stream-dwelling gudgeons in the Carpathian Basin, revealing the presence of known species like G. obtusirostris and G. gobio, and suggesting the existence of a new haplogroup and a doubtful taxon.
  • Using mitochondrial DNA sequencing and Amplified Fragment Length Polymorphism (AFLP), researchers found distinct population structures and genetic relationships among different gudgeon populations, revealing a pattern of geographic isolation.
  • The findings indicate ongoing speciation among gudgeons in the region, showing that while genetic distances are small, the populations are becoming more distinct, possibly influenced by their hydrographic environments rather than

Article Abstract

Although stream-dwelling gudgeons (Cyprinidae, genus: Gobio) are widespread in Central Europe, the taxonomy of this group and the distribution of its species are still unexplored in detail. The aims of our study are to ascertain taxonomic composition and distribution of the former Gobio gobio superspecies in the inner area of the Carpathian Basin. Since the presence of cryptic species is suspected in this area, we examined the taxonomic and phylogenetic relationships of Central European Gobio taxa by sequencing the mitochondrial DNA control region (mtCR). Additionally, we characterized the genetic structure of 27 stream-dwelling gudgeon populations of this area by Amplified Fragment Length Polymorphism (AFLP). Results of mtCR analysis proved the presence of three species already known as G. obtusirostris (dominant in NW-Hungary), G. gobio (sporadic) and G. carpathicus (sporadic). Additionally, the analysis revealed the existence of one doubtful taxon, G. sp1 (dominant in NE-Hungary), and a new isolated haplogroup (dominant in SW-Hungary). Although Network analysis showed significant detachment among haplogroups, their genetic distances were quite small. Therefore Bayesian phylogenetic analysis showed weak nodal support for the branching pattern both for newly described haplotypes, and for the already accepted species. AFLP data showed distinct population structure and a clear pattern of isolation was revealed by distance of stocks. At the same time, level of separation was not affected by the altitudinal position of sites. Moreover we found three major clusters of populations which were separated according to hydrographic regions, and corresponded to the findings of mtCR analysis. Our results suggest the on-going speciation of gudgeons in the Carpathian Basin, however the separation of haplogroups seems to only be an intermediate phase. The discovered natural pattern seems to be only slightly influenced by anthropogenic impacts. Additionally our results put into question the suitability of the recently accepted within Gobio genus taxonomy.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4019547PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0097278PLOS

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