David Tarkhnishvili

David Tarkhnishvili
Ilia State University | ISU · Institute of Ecology

Doctor of Philosophy

About

133
Publications
40,813
Reads
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1,313
Citations
Citations since 2016
36 Research Items
775 Citations
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2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
Dean of School of Natural Sciences and Engineering, Head of the Ilia State University Institute of Ecology, lab of the Quantitative Ecology Scientific interests / research interests: Evolutionary biology, Speciation, Population ecology and genetics, Ecological modeling, Biogeography, Human population genetics, Caucasus Graduated from Tbilisi State University (Biology, zoology) (1982). PhD in Ecology from Research Inst. of Ecology, Ural Sci. Center at Sverdlovsk (pres. Ekaterinsburg), Russia, 1987. Research – interspecific competition of amphibians. Work experience – Tbilisi State University, Vietnam Tropical Center (1990), Bangor University, UK (1996-1997, post-doctoral fellow), Zoological Research Institute and Museum Al. Koenig, Bonn, Germany (1998; 1999-2003; post-doctoral fellow, researcher).Studies mostly in ecology, biogeography, population genetics and evolution of amphibians and reptiles. Over 100 published research papers. At Ilia State since 2006, employed as a dean of the school of Life Sciences, director of the Institute of Ecology, and dean of the School of Science and Engineering. Teaching: An introductory course “Evolution – From Darwin to Present: Facts and Theories”; BSc course “Essentials of Ecology”; “Statistics for Biologists” (MSc) and “Population Ecology and Genetics” (MSc) Taught within BSc and MSc programs in Biology and Ecology
Additional affiliations
January 2009 - December 2010
January 2008 - December 2012
Zoologisches Forschungsmuseum Alexander Koenig
September 1996 - present
Bangor University
Position
  • PostDoc Position

Publications

Publications (133)
Article
The genus Eunectes Wagler, 1830 is divided into four nominal species: E. murinus (Linnaeus, 1758), E. notaeus Cope, 1862, E. deschauenseei Dunn and Conant, 1936, and E. beniensis Dirksen, 2002 ( E. barbouri Dunn and Conant, 1936 being a synonym of E. murinus ). We analyze multivariate morphological traits (scalation, coloration pattern, and body sh...
Article
We compared the life history components of small and large-bodied unisexual (Darevskia dahli and Darevskia armeniaca) and bisexual (Darevskia portschinskii, Darevskia valentini, and Darevskia obscura) Caucasian rock lizard species. Research objectives were to determine whether reproductive mode (bisexual or parthenogenetic), female body size, altit...
Article
Full-text available
We genotyped multiple populations of all seven parthenogenetic species of rock lizards, genus Darevskia, as well as their putative sexual parental populations, using double digest RAD-sequencing genomic markers. Taking advantage of the conserved homology of the ZW/ZZ sex chromosomes among lacertid lizards, we aligned our short sequence reads to a r...
Article
We genotyped multiple populations of all seven parthenogenetic species of rock lizards, genus Darevskia, as well as their putative sexual parental populations, using double digest RAD-sequencing genomic markers. Taking advantage of the conserved homology of the ZW/ZZ sex chromosomes among lacertid lizards, we aligned our short sequence reads to a r...
Conference Paper
Full-text available
Biological invasions are recognized as one of the global problems accompanying the development of human civilization. The red-eared slider, Trachemys scripta elegans, originates from North America. This freshwater terrapin is one of the most popular pet reptiles in Eurasia. Young red-eared slider individuals are small and brightly colored, making t...
Conference Paper
Full-text available
Reptiles contribute to the global process of biological invasions, one of the problems accompanying the development of human civilization. The red-eared slider, Trachemys scripta elegans is one of the most popular pet reptiles in the world. Uncontrolled releases of this animal into outdoor water bodies represents a conservational issue. We combined...
Article
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This study clarifies the role of refugia and landscape permeability in the formation of the current genetic structure of peoples of the Caucasus. We report novel genome-wide data for modern individuals from the Caucasus, and analyze them together with available Paleolithic and Mesolithic individuals from Eurasia and Africa in order (1) to link the...
Article
Twentytwo snake species are recorded for Georgia. Over three years (2017-2019), social media (Facebook, iNaturalist and Instagram) was inspected to identify new snake records for Georgia. This led to an increase in the total number of known snake locations by 78% and this gain led to considerable growth of the Extent of Occurrence (up to 269%) and...
Article
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Two species of rock lizards, the parthenogenetic D. dahli and the sexually reproducing D. portschinskii , coexist in a rocky outcrop in an area of ca. 1 ha, in the vicinity of Tbilisi, Georgia; the location has been well-known since the middle 1960s. The population density of the parthenogenetic lizard is five times higher than that of the sexual b...
Article
Full-text available
Background: The majority of parthenogenetic vertebrates derive from hybridization between sexually reproducing species, but the exact number of hybridization events ancestral to currently extant clonal lineages is difficult to determine. Usually, we do not know whether the parental species are able to contribute their genes to the parthenogenetic...
Article
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Grey wolf and golden jackal are both common in Georgia, although they have different habitat preferences. The wolf is more common in mountain areas of the country, and jackals are more common in the lowland part of Georgia, with its milder and warmer climate. In recent decades, the abundance of both species increased. Simultaneously, the jackals ar...
Article
The two species of rock lizards, Darevsia raddei and D. portschinskii, belong to two different phylogenetic clades of the same genus. They are supposed ancestors for the hybrid parthenogenetic, D. rostombekowi. The present study aims to identify morphological features of these two species and the potential gene introgression between them in the are...
Article
Full-text available
We generated a phylogeny for Caucasian rock lizards (Darevskia), and included six other families of true lizards (Lacertini), based on complete mitochondrial genome analysis. Next-generation sequencing (NGS) of genomic DNA was used to obtain 16 new mitogenomes of Darevskia. These, along with 35 sequences downloaded from GenBank: genera Darevskia, Z...
Article
Phenotypic evolution can cause either divergent or convergent phenotypic patterns. Even adaptation to the same environment may result in divergence of some elements of phenotype, whereas for other morphological traits it could cause phenotypic convergence. We hypothesize that at least some phenotypic characters diverge monotonically, hence they evo...
Preprint
Full-text available
Three species of cetaceans, Phocoena phocoena, Delphinus delphis and Tursiops truncatus ponticus are found in the Black Sea. The Black Sea populations of all three species show morpho-ecological peculiarities that leaded to their subspecific status: P. p. relicta (PPR), D. d. ponticus (DDP), and T. t. ponticus (TTP). It is not clear how long-lastin...
Article
The difference between phenotypic and genotypic differentiation of conspecific populations is commonly used for detecting natural selection. However, phenotypic variation integrates both genetic and non-genetic components, and this may lead researchers to false conclusions. To avoid bias, the analysis of the heritability of individual phenotypic ch...
Technical Report
Full-text available
Here we report on collaborative expeditions run by ISU (Ilia State University, Tbilisi), ZFMK (Zoologisches Forschungsmuseum Alexander Koenig, Bonn) and external taxonomists in Georgia in 2018 and 2019 as part of the renewed close cooperation between Germany and Caucasus countries aiming at the exploration of biodiversity in the Caucasus region. Th...
Research Proposal
Full-text available
Attention to the special role of mountains has historically benefited enormously from sustained interaction between scientists, practitioners, and policy makers. The Caucasus Regional Research Agenda (C-RRA) is but the latest sign of these crucial and productive interactions. The C-RRA is the collective outcome of a dialogue among scientists from A...
Data
ZIP-compressed map of the inferred biomes during the Last Glacial Maximum (LGM). This map is in a raster Arc/Info binary format developed by ESRI (Environmental Systems Research Institute). The binary format, also known as an ARC/INFO GRID or ARC GRID, can easily be viewed, analyzed, processed and exported to different formats within ESRI programs...
Article
Geometric morphometrics is a better tool to evaluate the variation of shape than ‘traditional’ morphometrics. In reptiles, it outperforms morphometrics based on linear measurements and scalation. In an earlier study, two-dimensional outline-based geometric morphometrics in six species of rock lizards (Darevskia) showed that their shapes reflected t...
Conference Paper
Full-text available
Most researchers interpret genotypic diversity within some forms of parthenogenetic Darevskia as indirect evidence of their polyclonal origin. Tarkhnishvili et al. (2017) showed that two parthenogens, both matrilineally descending from Darevskia mixta, share genotypes at two microsatellite loci. They concluded that a single hybrid lineage participa...
Article
Full-text available
Current taxonomy of western Eurasian trout leaves a number of questions open; it is not clear to what extent some species are distinct genetically and morphologically. The purpose of this paper was to explore phylogeography and species boundaries in freshwater and anadromous trout from the drainages of the Black and the Caspian Seas (Ponto-Caspian)...
Article
The Lebanon Lizard (Phoenicolacerta laevis) occurs on the Levantine coast and scattered populations are found in isolated coastal habitats along the southern and south-western coast of Turkey. We found an isolated but dense population of this species at and around the castle of Anaklia on Georgia’s Black Sea Coast, near the mouth of the river Engur...
Article
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The analyses of 15 autosomal and 23 Y-chromosome DNA STR loci in five rural populations from the Caucasus, namely four ethnically Georgian and one ethnically Armenian populations, indicated that two populations of Georgians - one from the west and the other one from the east of the Greater Caucasus Mountains - were both patrilineally and autosomall...
Article
The genus Darevskia comprises over 20 species of small-bodied lizards, mainly occurring in the Caucasus Mountain Region. They show differences in body size, scalation and coloration, however, fully diagnostic characters that could separate the species with a high confidence level are still lacking. The early phylogenetic hypothesis of this group wa...
Article
Full-text available
The parthenogenetic lizards Darevskia armeniaca and Darevskia dahli are widespread throughout the Lesser Caucasus, although they occupy different habitats. While these forms differ in size, colour and scalation, both D. armeniaca and D. dahli have a hybrid origin and a common maternal progenitor species. Current evidence about the patrilineal origi...
Article
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The rock lizards of the Darevskia saxicola complex are found exclusively in the west of the Greater Caucasus and in southern Crimea. The earliest split within this group occurred between D. saxicola from the northern and D. brauneri from the southern slopes of the Greater Caucasus, followed by the split between D. brauneri and the Crimean D. lindho...
Article
AimOur research attempts to provide an explicit explanation of human-biome interactions during the last glacial period and how these have influenced current human population genetics at the global scale. Publications to date have not addressed this topic. LocationWorld-wide. Methods Using climate, terrain, hydrographic, fossil pollen and plant-macr...
Article
Full-text available
Background: Reliable taxonomy underpins communication in all of biology, not least nature conservation and sustainable use of ecosystem resources. The flexibility of taxonomic interpretations, however, presents a serious challenge for end-users of taxonomic concepts. Users need standardised and continuously harmonised taxonomic reference systems,...
Article
The Caucasian rock lizard Darevskia mixta was sampled and studied from throughout its range, using mitochondrial cytochrome b sequences and scalation. The populations of the Greater and the Lesser Caucasus are reciprocally monophyletic matrilineally, and the respective lineages have been separated since the mid-Pleistocene. The lizards from the Gre...
Article
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As a result of intensive biodiversity research it became essential to accumulate existing information and increasing it’s accessibility to researchers globally. In last two decades several national and international biodiversity databases were created. In this paper we describe development of Georgian biodiversity database (www.biodiversity-georgia...
Book
The Caucasus is a mountain region located at the edge of Europe and Asia, between the Black and Caspian seas. In spite of limited geography and mostly temperate climate, diversity of natural landscapes, plant and animal species, and cultivated plants is unusually high. For these reasons, the Caucasus has been included in the list of global biodiver...
Article
Full-text available
Publications that describe the human Y-DNA haplogroup composition in different ethnic or linguistic groups and geographic regions provide no explicit explanation of the distribution of human paternal lineages in relation to specific ecological conditions. Our research attempts to address this topic for the Caucasus – a geographic region that en...
Article
Full-text available
We studied the distribution of the mitochondrial DNA haplotypes and microsatellite genotypes at 8 loci in 102 gray wolves, 57 livestock guarding dogs, and 9 mongrel dogs from Georgia (Caucasus). Most of the studied dogs had mitochondrial haplotypes clustered with presumably East Asian dog lineages, and most of the studied wolves had the haplotypes...
Article
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Two species of genus Helix Linnaeus, 1758 (Mollusca: Gastropoda: Helicidae) endemic to the Caucasus region are known from Georgia and northeastern Turkey: Helix buchii Dubois de Montpereux, 1839 and the recently-described but disputed Helix goderdziana Mumladze, Tarkhnishvili and Pokryszko, 2008. The latter species is the largest land snail throu...
Article
Given sufficient time and limited gene flow, evolutionary lineages tend to transform into separate species. Mechanisms preventing assimilation during repeated gene-flow events include divergent adaptations and the development of pre- or postzygotic isolation. We analysed the morphological and genetic boundaries of three species of the rock lizard c...
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