Evolution in the Dinarids: phylogeography, diversity and evolutionary history of the endemic genus Delminichthys (Actinopteri; Leuciscidae)
-
1
Faculty of Science, University of Zagreb, Croatia
-
2
Faculty of Teacher Education, University of Zagreb, Croatia
-
3
National Museum (Czechia), Czechia
The origin of exceptionally rich fish communities harbored within the freshwater systems of southern Europe is usually explained by allopatric speciation due to a long isolation of water basins. On the other hand, hybridization events are generally not considered to play an important role in the evolutionary history, although they have been recorded in several fish species. Contrary to most species within the Leuciscidae family, the genus Delminichthys inhabits a geographically restricted area (middle and southern Dinarides) and consists of only four endemic species. This study analysed the population genetic structure and demographic history of each Delminichthys species as a contribution to the understanding of the evolutionary peculiarities in Dinaric water systems. The obtained results revealed pronounced mito-nuclear discordance, likely the result of incomplete lineage sorting, as well as extensive nuclear introgression observed in the Ombla River population in southernmost Croatia. In addition to allopatric speciation, ancient hybridization appears to have played an important role in the evolutionary history of this genus. The origin of the genus Delminichthys can be dated back to the Oligocene/Miocene boundary, to a period of significant tectonic activity in the Mediterranean region, and its ancestor likely inhabited the region of the central Dinarides. Intrageneric divergences occurred in the lower Miocene and Pliocene. Similarly, as previously proposed for D. adspersus, traces of underground migrations were found among D. ghetaldii populations, implying adaptations to underground life that are characteristic for the genus. All Delminichthys species express high levels of genetic diversity, likely as a consequence of their old origin. The population size of D. adspersus is currently decreasing, while the remaining three species appear stable.
Keywords:
Dinaric freshwater systems,
evolutionary history,
Genetic composition,
genus Delminichthys,
nuclear introgression,
subterranean migrations
Conference:
XVI European Congress of Ichthyology, Lausanne, Switzerland, 2 Sep - 6 Sep, 2019.
Presentation Type:
Oral
Topic:
GENETICS, GENOMICS AND PHYSIOLOGY
Citation:
Buj
I,
Ćaleta
M,
Marčić
Z,
Sanda
R,
Zanella
D,
Horvatić
S and
Musafić
P
(2019). Evolution in the Dinarids: phylogeography, diversity and evolutionary history of the endemic genus Delminichthys (Actinopteri; Leuciscidae).
Front. Mar. Sci.
Conference Abstract:
XVI European Congress of Ichthyology.
doi: 10.3389/conf.fmars.2019.07.00063
Copyright:
The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers.
They are made available through the Frontiers publishing platform as a service to conference organizers and presenters.
The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated.
Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed.
For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions.
Received:
12 Jul 2019;
Published Online:
14 Aug 2019.
*
Correspondence:
Mx. Ivana Buj, Faculty of Science, University of Zagreb, Zagreb, Zagreb, 10000, Croatia, ivaradic@biol.pmf.hr