Varos Petrosyan - Academia.edu (original) (raw)
Papers by Varos Petrosyan
Biology
The striped field mouse (Apodemus agrarius Pallas, 1771) is a widespread species in Northern Eura... more The striped field mouse (Apodemus agrarius Pallas, 1771) is a widespread species in Northern Eurasia. It damages crops and carries zoonotic pathogens. Its current and future range expansion under climate change may negatively affect public health and the economy, warranting further research to understand the ecological and invasive characteristics of the species. In our study, we used seven algorithms (GLM, GAM, GBS, FDA, RF, ANN, and MaxEnt) to develop robust ensemble species distribution models (eSDMs) under current (1970–2000) and future climate conditions derived from global circulation models (GCMs) for 2021–2040, 2041–2060, 2061–2080, and 2081–2100. Simulation of climate change included high-, medium-, and low-sensitivity GCMs under four scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5). We analyzed the habitat suitability across GCMs and scenarios by constructing geographical ranges and calculating their centroids. The results showed that the range changes depended on bo...
Russian Journal of Genetics, 2009
The t-complex includes a complex system of genes localized in the proximal region of chromosome 1... more The t-complex includes a complex system of genes localized in the proximal region of chromosome 17 of house mouse Mus musculus. The results of microsatellite analysis of laboratory stocks of house mice carrying t12, t(w5) t(w12), and t(w73) haplotypes and wild mice from natural populations of Russia (Volgograd, Rostov, Saratov oblasts, and Kalmykia), Armenia, Bulgaria, Iran, and Mongolia performed by the PCR method with the use of eight pairs of D17Mit primers (16, 21, 23, 28, 32, 57, 63, 78) are presented. These pairs of primers amplify microsatellite DNA sequences on mouse chromosome 17 in the region from 7.6 to 18.8 cM that correspond to inversions (In (17) 3, 4). Each pair of primers recognized three to six variants of nucleotide sequences ranging in size from 90--120 bp (D17Mit 16) to 300--330 bp (D17Mit 57). In most cases, two variants of nucleotide sequences were detected in each individual, i. e., most individuals were heterozygous for the microsatellite loci under study. The highest similarity of the spectra of microsatellite DNA fragments was revealed in laboratory stocks of house mice carrying the t(w5) and t(w73) haplotypes. The spectra of animals from the Rostov and Volgograd oblasts appeard to be most similar to them. The microsatellite spectra of individuals from Iran closely resemble the spectrum of an individual from Armenia. It was demonstrated that amplified microsatellite fragments localized in the region of the t-complex can be used to identify representatives of the Mus genus from wild populations.
In the current manuscript, we present the results of comparative analysis of seven species of Mer... more In the current manuscript, we present the results of comparative analysis of seven species of Meromyza flies in the " variegata" cluster and of the evolutionary close species M. inornata, based the following criteria: 1) 14 external key features; 2) shape and area of the anterior processes of postgonites; 3) mtDNA CO1 region and 4) host plant diversity data. We could demonstrate the primary role of host plants in species formation inside genus Meromyza and calculated the timing of the divergence of M. inornata and the species of " variegata" cluster. Based on our estimates of evolution rate for mtDNA CO1 gene, we could conclude that that divergence of herbs happened before the speciation of grass flies Meromyza. Meromyza species, close to the ancestral species of the cluster, are adapted to the wide range of host plants. We revealed the most informative variables h1, S and Plant analysing data with the following statistical methods: linear discriminant analysis-LDA, regularised discriminant analysis-RDA, flexible discriminant analysis-FDA and probabilistic neural network-PNN. The highest classification accuracy was achieved using PNN (99%) and the lowest when using LDA (95.8%). When the Plant trait was excluded, the classification accuracy decreased by 14%. We revealed the significant trends in size change of the anterior process of the postgonite amongst studies species. This morphological structure is an element of male reproductive apparatus critical for the ‡ ‡ ‡ ‡ © Triseleva T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. restriction of interspecies mating. We determined three branches of speciation in the " variegata" cluster and five trends in the evolution of this cluster, based on the external morphological features. We showed that M. variegata and especially M. mosquensis, the species closest to the ancestral haplotype, have the largest number of features typical of those of M. inornata. Based on the external features and the area of the anterior process of the postgonite, we reconstructed the phylogenetic position of M. elbergi in the cluster. In accordance with the obtained outcomes, we could conclude that the distribution, species diversity and the adaptation of the grass flies to narrow oligophagy were directly connected to host plant diversity. The adaptation to different host plants could be the main factor in divergence of grass flies and their evolution started later than the diversification in the Pooideae subfamily of grasses. Keywords morphometric, mtDNA CO1, postgonites, Poaceae, co-evolution insect-plant of triangle), h4 (ratio of the width of hind femur to the width of hind tibia), L (length of the body without abdomen), L1 (ratio of the length of head to the length of mesonotum), L2 (ratio of mesonotum to scutellum), S (area of anterior process of the postgonite) and six qualitative traits (Table 1). Additionally, we analysed three ecological characters: habitat, biotope and species of host plants.
In the current manuscript, we present the results of comparative analysis of seven species of Mer... more In the current manuscript, we present the results of comparative analysis of seven species of Meromyza flies in the " variegata" cluster and of the evolutionary close species M. inornata, based the following criteria: 1) 14 external key features; 2) shape and area of the anterior processes of postgonites; 3) mtDNA CO1 region and 4) host plant diversity data. We could demonstrate the primary role of host plants in species formation inside genus Meromyza and calculated the timing of the divergence of M. inornata and the species of " variegata" cluster. Based on our estimates of evolution rate for mtDNA CO1 gene, we could conclude that that divergence of herbs happened before the speciation of grass flies Meromyza. Meromyza species, close to the ancestral species of the cluster, are adapted to the wide range of host plants. We revealed the most informative variables h1, S and Plant analysing data with the following statistical methods: linear discriminant analysis-LDA, regularised discriminant analysis-RDA, flexible discriminant analysis-FDA and probabilistic neural network-PNN. The highest classification accuracy was achieved using PNN (99%) and the lowest when using LDA (95.8%). When the Plant trait was excluded, the classification accuracy decreased by 14%. We revealed the significant trends in size change of the anterior process of the postgonite amongst studies species. This morphological structure is an element of male reproductive apparatus critical for the ‡ ‡ ‡ ‡ © Triseleva T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. restriction of interspecies mating. We determined three branches of speciation in the " variegata" cluster and five trends in the evolution of this cluster, based on the external morphological features. We showed that M. variegata and especially M. mosquensis, the species closest to the ancestral haplotype, have the largest number of features typical of those of M. inornata. Based on the external features and the area of the anterior process of the postgonite, we reconstructed the phylogenetic position of M. elbergi in the cluster. In accordance with the obtained outcomes, we could conclude that the distribution, species diversity and the adaptation of the grass flies to narrow oligophagy were directly connected to host plant diversity. The adaptation to different host plants could be the main factor in divergence of grass flies and their evolution started later than the diversification in the Pooideae subfamily of grasses. Keywords morphometric, mtDNA CO1, postgonites, Poaceae, co-evolution insect-plant of triangle), h4 (ratio of the width of hind femur to the width of hind tibia), L (length of the body without abdomen), L1 (ratio of the length of head to the length of mesonotum), L2 (ratio of mesonotum to scutellum), S (area of anterior process of the postgonite) and six qualitative traits (Table 1). Additionally, we analysed three ecological characters: habitat, biotope and species of host plants.
Trends in Ecology & Evolution, 2016
Biodiversity Data Journal, 2021
Open access to occurrence records of the most dangerous invasive species in a standardised format... more Open access to occurrence records of the most dangerous invasive species in a standardised format have important potential applications for ecological research and management, including the assessment of invasion risks, formulation of preventative and management plans in the context of global climate and land use changes in the short and long perspective. The striped field mouse (Apodemus agrarius Pallas, 1771) is a common species in the temperate latitudes of the Palaearctic. Due to land use and global climate changes, several waves of expansion of the range of this species have been observed or inferred. By intrusion into new regions, the striped field mouse has become an alien species there. Apodemus agrarius causes significant harm to agriculture and is one of the most important pests of grain crops. In tree nurseries, A. agrarius destroys seeds of valuable tree species and gnaws at the bark of saplings of broadleaf species and berry bushes. It is one of the most epidemiological...
Mathematics, 2020
Among vertebrates, true parthenogenesis is known only in reptiles. Parthenogenetic lizards of the... more Among vertebrates, true parthenogenesis is known only in reptiles. Parthenogenetic lizards of the genus Darevskia emerged as a result of the hybridization of bisexual parental species. However, uncertainty remains about the mechanisms of the co-existence of these forms. The geographical parthenogenesis hypothesis suggests that unisexual forms can co-exist with their parental species in the “marginal” habitats. Our goal is to investigate the influence of environmental factors on the formation of ecological niches and the distribution of lizards. For this reason, we created models of species distribution and ecological niches to predict the potential geographical distribution of the parthenogenetic and its parental species. We also estimated the realized niches breadth, their overlap, similarities, and shifts in the entire space of predictor variables. We found that the centroids of the niches of the three studied lizards were located in the mountain forests. The “maternal” species D....
Check List, 2019
During field survey in 2018, we recorded in Armenia the occurrences of the parthenogenetic lizard... more During field survey in 2018, we recorded in Armenia the occurrences of the parthenogenetic lizard Darevskia armeniaca and its “paternal” bisexual species D. valentini. Based on our new data and records taken from publications and museums, we update the distribution maps of these species. The new records expand the geographical boundaries of sympatric habitats of these species and provide additional data for understanding the mechanisms of reticulate evolution and hybrid speciation.
Russian Journal of Biological Invasions, 2013
Journal of Heredity, 2007
Biology
The striped field mouse (Apodemus agrarius Pallas, 1771) is a widespread species in Northern Eura... more The striped field mouse (Apodemus agrarius Pallas, 1771) is a widespread species in Northern Eurasia. It damages crops and carries zoonotic pathogens. Its current and future range expansion under climate change may negatively affect public health and the economy, warranting further research to understand the ecological and invasive characteristics of the species. In our study, we used seven algorithms (GLM, GAM, GBS, FDA, RF, ANN, and MaxEnt) to develop robust ensemble species distribution models (eSDMs) under current (1970–2000) and future climate conditions derived from global circulation models (GCMs) for 2021–2040, 2041–2060, 2061–2080, and 2081–2100. Simulation of climate change included high-, medium-, and low-sensitivity GCMs under four scenarios (SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5). We analyzed the habitat suitability across GCMs and scenarios by constructing geographical ranges and calculating their centroids. The results showed that the range changes depended on bo...
Russian Journal of Genetics, 2009
The t-complex includes a complex system of genes localized in the proximal region of chromosome 1... more The t-complex includes a complex system of genes localized in the proximal region of chromosome 17 of house mouse Mus musculus. The results of microsatellite analysis of laboratory stocks of house mice carrying t12, t(w5) t(w12), and t(w73) haplotypes and wild mice from natural populations of Russia (Volgograd, Rostov, Saratov oblasts, and Kalmykia), Armenia, Bulgaria, Iran, and Mongolia performed by the PCR method with the use of eight pairs of D17Mit primers (16, 21, 23, 28, 32, 57, 63, 78) are presented. These pairs of primers amplify microsatellite DNA sequences on mouse chromosome 17 in the region from 7.6 to 18.8 cM that correspond to inversions (In (17) 3, 4). Each pair of primers recognized three to six variants of nucleotide sequences ranging in size from 90--120 bp (D17Mit 16) to 300--330 bp (D17Mit 57). In most cases, two variants of nucleotide sequences were detected in each individual, i. e., most individuals were heterozygous for the microsatellite loci under study. The highest similarity of the spectra of microsatellite DNA fragments was revealed in laboratory stocks of house mice carrying the t(w5) and t(w73) haplotypes. The spectra of animals from the Rostov and Volgograd oblasts appeard to be most similar to them. The microsatellite spectra of individuals from Iran closely resemble the spectrum of an individual from Armenia. It was demonstrated that amplified microsatellite fragments localized in the region of the t-complex can be used to identify representatives of the Mus genus from wild populations.
In the current manuscript, we present the results of comparative analysis of seven species of Mer... more In the current manuscript, we present the results of comparative analysis of seven species of Meromyza flies in the " variegata" cluster and of the evolutionary close species M. inornata, based the following criteria: 1) 14 external key features; 2) shape and area of the anterior processes of postgonites; 3) mtDNA CO1 region and 4) host plant diversity data. We could demonstrate the primary role of host plants in species formation inside genus Meromyza and calculated the timing of the divergence of M. inornata and the species of " variegata" cluster. Based on our estimates of evolution rate for mtDNA CO1 gene, we could conclude that that divergence of herbs happened before the speciation of grass flies Meromyza. Meromyza species, close to the ancestral species of the cluster, are adapted to the wide range of host plants. We revealed the most informative variables h1, S and Plant analysing data with the following statistical methods: linear discriminant analysis-LDA, regularised discriminant analysis-RDA, flexible discriminant analysis-FDA and probabilistic neural network-PNN. The highest classification accuracy was achieved using PNN (99%) and the lowest when using LDA (95.8%). When the Plant trait was excluded, the classification accuracy decreased by 14%. We revealed the significant trends in size change of the anterior process of the postgonite amongst studies species. This morphological structure is an element of male reproductive apparatus critical for the ‡ ‡ ‡ ‡ © Triseleva T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. restriction of interspecies mating. We determined three branches of speciation in the " variegata" cluster and five trends in the evolution of this cluster, based on the external morphological features. We showed that M. variegata and especially M. mosquensis, the species closest to the ancestral haplotype, have the largest number of features typical of those of M. inornata. Based on the external features and the area of the anterior process of the postgonite, we reconstructed the phylogenetic position of M. elbergi in the cluster. In accordance with the obtained outcomes, we could conclude that the distribution, species diversity and the adaptation of the grass flies to narrow oligophagy were directly connected to host plant diversity. The adaptation to different host plants could be the main factor in divergence of grass flies and their evolution started later than the diversification in the Pooideae subfamily of grasses. Keywords morphometric, mtDNA CO1, postgonites, Poaceae, co-evolution insect-plant of triangle), h4 (ratio of the width of hind femur to the width of hind tibia), L (length of the body without abdomen), L1 (ratio of the length of head to the length of mesonotum), L2 (ratio of mesonotum to scutellum), S (area of anterior process of the postgonite) and six qualitative traits (Table 1). Additionally, we analysed three ecological characters: habitat, biotope and species of host plants.
In the current manuscript, we present the results of comparative analysis of seven species of Mer... more In the current manuscript, we present the results of comparative analysis of seven species of Meromyza flies in the " variegata" cluster and of the evolutionary close species M. inornata, based the following criteria: 1) 14 external key features; 2) shape and area of the anterior processes of postgonites; 3) mtDNA CO1 region and 4) host plant diversity data. We could demonstrate the primary role of host plants in species formation inside genus Meromyza and calculated the timing of the divergence of M. inornata and the species of " variegata" cluster. Based on our estimates of evolution rate for mtDNA CO1 gene, we could conclude that that divergence of herbs happened before the speciation of grass flies Meromyza. Meromyza species, close to the ancestral species of the cluster, are adapted to the wide range of host plants. We revealed the most informative variables h1, S and Plant analysing data with the following statistical methods: linear discriminant analysis-LDA, regularised discriminant analysis-RDA, flexible discriminant analysis-FDA and probabilistic neural network-PNN. The highest classification accuracy was achieved using PNN (99%) and the lowest when using LDA (95.8%). When the Plant trait was excluded, the classification accuracy decreased by 14%. We revealed the significant trends in size change of the anterior process of the postgonite amongst studies species. This morphological structure is an element of male reproductive apparatus critical for the ‡ ‡ ‡ ‡ © Triseleva T et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. restriction of interspecies mating. We determined three branches of speciation in the " variegata" cluster and five trends in the evolution of this cluster, based on the external morphological features. We showed that M. variegata and especially M. mosquensis, the species closest to the ancestral haplotype, have the largest number of features typical of those of M. inornata. Based on the external features and the area of the anterior process of the postgonite, we reconstructed the phylogenetic position of M. elbergi in the cluster. In accordance with the obtained outcomes, we could conclude that the distribution, species diversity and the adaptation of the grass flies to narrow oligophagy were directly connected to host plant diversity. The adaptation to different host plants could be the main factor in divergence of grass flies and their evolution started later than the diversification in the Pooideae subfamily of grasses. Keywords morphometric, mtDNA CO1, postgonites, Poaceae, co-evolution insect-plant of triangle), h4 (ratio of the width of hind femur to the width of hind tibia), L (length of the body without abdomen), L1 (ratio of the length of head to the length of mesonotum), L2 (ratio of mesonotum to scutellum), S (area of anterior process of the postgonite) and six qualitative traits (Table 1). Additionally, we analysed three ecological characters: habitat, biotope and species of host plants.
Trends in Ecology & Evolution, 2016
Biodiversity Data Journal, 2021
Open access to occurrence records of the most dangerous invasive species in a standardised format... more Open access to occurrence records of the most dangerous invasive species in a standardised format have important potential applications for ecological research and management, including the assessment of invasion risks, formulation of preventative and management plans in the context of global climate and land use changes in the short and long perspective. The striped field mouse (Apodemus agrarius Pallas, 1771) is a common species in the temperate latitudes of the Palaearctic. Due to land use and global climate changes, several waves of expansion of the range of this species have been observed or inferred. By intrusion into new regions, the striped field mouse has become an alien species there. Apodemus agrarius causes significant harm to agriculture and is one of the most important pests of grain crops. In tree nurseries, A. agrarius destroys seeds of valuable tree species and gnaws at the bark of saplings of broadleaf species and berry bushes. It is one of the most epidemiological...
Mathematics, 2020
Among vertebrates, true parthenogenesis is known only in reptiles. Parthenogenetic lizards of the... more Among vertebrates, true parthenogenesis is known only in reptiles. Parthenogenetic lizards of the genus Darevskia emerged as a result of the hybridization of bisexual parental species. However, uncertainty remains about the mechanisms of the co-existence of these forms. The geographical parthenogenesis hypothesis suggests that unisexual forms can co-exist with their parental species in the “marginal” habitats. Our goal is to investigate the influence of environmental factors on the formation of ecological niches and the distribution of lizards. For this reason, we created models of species distribution and ecological niches to predict the potential geographical distribution of the parthenogenetic and its parental species. We also estimated the realized niches breadth, their overlap, similarities, and shifts in the entire space of predictor variables. We found that the centroids of the niches of the three studied lizards were located in the mountain forests. The “maternal” species D....
Check List, 2019
During field survey in 2018, we recorded in Armenia the occurrences of the parthenogenetic lizard... more During field survey in 2018, we recorded in Armenia the occurrences of the parthenogenetic lizard Darevskia armeniaca and its “paternal” bisexual species D. valentini. Based on our new data and records taken from publications and museums, we update the distribution maps of these species. The new records expand the geographical boundaries of sympatric habitats of these species and provide additional data for understanding the mechanisms of reticulate evolution and hybrid speciation.
Russian Journal of Biological Invasions, 2013
Journal of Heredity, 2007