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58 results for “Darevskia”
Fig. 2 in Current Distribution Of The Introduced Rock Lizards Of The Darevskia (Saxicola) Complex (Sauria, Lacertidae, Darevskia) In Zhytomyr Region (Ukraine)
Fig. 2. List and location of the studied sites: 1 — cliffs to east of the resort Denyshy (28.39 E, 50.20 N); 2 — dam across the Teteriv River near the resort Denyshy (28.38 E, 50.20 N); 3 — river bank to the west from the UVD resort (mouth of the Bobrovka River; 28.36 E, 50.21 N); 4 — bridge over the Bobrovka River (28.36 E, 50.21 N); 5 — bay in Buky Village (28.36 E, 50.20 N); 6 — cape in Buky Village (28.35 E, 50.19 N); 7 — cliffs between Buky Village and country houses (28.34 E, 50.19 N); 8 — river bank in Rudnya-Nova Village (28.30 E, 50.19 N); 9 — cape in Rudnya-Nova Village (28.32 E, 50.19 N); 10 — bridge over the Glubochok River (28.36 E, 50.18 N); 11 — river bank in Tryhirya Village (28.37 E, 50.19 N); 12 — right bank of the Teteriv River near dam (28.38 E, 50.20 N). Sites were lizards were found are marked by black color.
Fig. 1 in Current Distribution Of The Introduced Rock Lizards Of The Darevskia (Saxicola) Complex (Sauria, Lacertidae, Darevskia) In Zhytomyr Region (Ukraine)
Fig. 1. Chronological scheme and changes in the number of rock lizards Darevskia (saxicola) near Denyshy Village (after Darevsky, Shcherbak, 1968; Dotsenko, Darevsky, 2005; Darevsky, 2006): arm — D. armeniaca, dahl — D. dahli and mix — D. mixta, — introduction.
Figure 2 in Data on nocturnal activity of Darevskia rudis (Bedriaga, 1886) (Sauria: Lacertidae) in Central Black Sea Region, Turkey
Figure 2: The major nocturnal activities of Darevskia rudis. (a: leaving the shelter, b: mobility in its habitat, c: foraging, d: fronting to artificial light source and e: feeding).
Fig. 3 in Current Distribution Of The Introduced Rock Lizards Of The Darevskia (Saxicola) Complex (Sauria, Lacertidae, Darevskia) In Zhytomyr Region (Ukraine)
Fig. 3. «Brown melanist» (partially melanist) D. dahli from near Denyshy Village.
Figure 1 in Data on nocturnal activity of Darevskia rudis (Bedriaga, 1886) (Sauria: Lacertidae) in Central Black Sea Region, Turkey
Figure 1: Transect lines along the Sinop historical prison walls.
FIGURE 6 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 6. Canonical Discriminant Analysis (CDA) plots for males and females together, including Georgian specimens. Specimens, sample centroids and group perimeters are represented. For details, percentage of variance explained, and other data, see text.
FIGURE 3 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 3. UPGMA trees (males) derived from Mahalanobis' distances among sample centroids. See text for interpretation.
FIGURE 8 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 8. Box Plots of dorsalia values in different populations of the D, clarkorum/dryada studied (numbers of samples as in Material and Methods): 1) Sümela, 2) Çataldere, 3) Hemşin, 4) Ayder, 5) Hatila Plateau, 6) Ortacalar 7) Subaşı & Yoldere (Turkish "dryada"), 8) Cankurtaran Pass, 9) Karagöl, 10) Charnaly River Gorge (Georgian D. dryada). The center is the median, the length of the rectangle is the interquartile range (from the 25th to the 75th percentile) and represents the central 50% of data. Line is the spread from minimum to maximum values. Green point is a severe outlier.
FIGURE 2 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 2. Canonical Discriminant Analysis (CDA) plots for males. Specimens, sample centroids and group perimeters are represented. For details, percentage of variance explained, and other data, see text.
FIGURE 5 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 5. UPGMA trees (females) derived from Mahalanobis' distances among sample centroids. See text for interpretation.
FIGURE 1. Map showing the localities from where specimens have been studied. 1 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 1. Map showing the localities from where specimens have been studied. 1. Sümela, Maçka, Trabzon, northeastern Anatolia, Turkey, 2. Çataldere, Kaptanpaşa, Rize, northeastern Anatolia, Turkey, 3. 11 km southwest of Hemşin, Rize, northeastern Anatolia, Turkey, 4. Ayder Plateau, Çamlıhemşin, Rize, northeastern Anatolia, Turkey, 5. Hatila Plateau, Artvin, northeastern Anatolia, Turkey, 6. 16 km northeast of Ortacalar, Arhavi, Artvin, northeastern Anatolia, Turkey, 7. Subaşı Village, Hopa, Artvin, northeastern Anatolia, Turkey, 8. Cankurtaran, Hopa, Artvin, northeastern Anatolia, Turkey, 9. Karagöl, Borçka, Artvin, northeastern Anatolia, Turkey, 10. Charnaly, Georgia
FIGURE 4 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 4. Canonical Discriminant Analysis (CDA) plots for females. Specimens, sample centroids and group perimeters are represented. For details, percentage of variance explained, and other data, see text.
FIGURE 9 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 9. Plot showing the inverse relationship between altitude and dorsalia mean values in the studied D. clarkorum/D. dryada populations (Spearman Rank Correlation coefficient: ρ = -0.72; P=0.01).
FIGURE 7 in Multivariate analysis of geographic variation in Darevskia clarkorum (Darevsky & Vedmederja, 1977), correlation with geographic and climatic parameters, and true status of Darevskia dryada (Darevsky & Tuniyev, 1997)
FIGURE 7. UPGMA trees derived from Mahalanobis' distances among sample centroids. See text for interpretation (males and females together, Turkey and Georgia).
Data from: The role of hybridisation in the origin and evolutionary persistence of vertebrate parthenogens: a case study of Darevskia lizards
Obligate parthenogenesis is found in only 0.1% of vertebrate species, is thought to be relatively short lived and is typically of hybrid origin. However, neither the evolutionary persistence of asexuality in vertebrates, nor the conditions that allow the generation of new parthenogenetic lineages are currently well understood. It has been proposed that vertebrate parthenogenetic lineages arise from hybridisation between two divergent taxa within a specific range of phylogenetic distances (the "Balance Hypothesis"). Moreover, parthenogenetic species often maintain a certain level of hybridisation with their closest sexual relatives, potentially generating new polyploid hybrid lineages. Here we address the role of hybridisation in the origin and evolutionary lifespan of vertebrate parthenogens. We use a set of microsatellite markers to characterize the origins of parthenogens in the lizard genus Darevskia to study the distinctiveness of sexual and asexual taxa currently in sympatry, and to analyse the evolutionary consequences of interspecific hybridisation between asexual females and sexual males. We find that parthenogens result from multiple past hybridisation events between species from specific lineages over a range of phylogenetic distances. This suggests that the Balance Hypothesis needs to make allowance for lineage-specific effects, as envisaged in the "Phylogenetic Constraint Hypothesis". Our results show recurrent backcrossing between sexual and parthenogenetic Darevskia but neither gene flow nor formation of new asexual lineages is found. We suggest that, along with their demographic advantage, parthenogens gain additional leverage to outcompete sexuals in nature when the retention of sexual reproductive machinery allows backcrossing with their sexual ancestors.
FIGURE 6. a in External morphology and osteology of Darevskia rudis (Bedriaga, 1886), with a taxonomic revision of the Pontic and Small-Caucasus populations (Squamata: Lacertidae)
FIGURE 6. a. Darevskia rudis mirabilis ssp.nov. Male dorsal coloration in life. Dorsal view. b. D. r. mirabilis ssp. nov. Male ventral coloration. c. Photograph of the type locality of Darevskia rudis bolkardaghica ssp. nov.
FIGURE 5. a. Darevskia rudis mirabilis ssp.nov. Holotype. Dorsal view. b. D. r. mirabilis ssp. nov. Holotype. Ventral view. c. Darevskia rudis bolkardaghica ssp. nov. Holotype. Dorsal view. d. D. r in External morphology and osteology of Darevskia rudis (Bedriaga, 1886), with a taxonomic revision of the Pontic and Small-Caucasus populations (Squamata: Lacertidae)
FIGURE 5. a. Darevskia rudis mirabilis ssp.nov. Holotype. Dorsal view. b. D. r. mirabilis ssp. nov. Holotype. Ventral view. c. Darevskia rudis bolkardaghica ssp. nov. Holotype. Dorsal view. d. D. r. bolkardaghica ssp. nov. Holotype. Ventral view.
FIGURE 3 in External morphology and osteology of Darevskia rudis (Bedriaga, 1886), with a taxonomic revision of the Pontic and Small-Caucasus populations (Squamata: Lacertidae)
FIGURE 3. UPGMA trees derived from Mahalanobis' distances among sample centroids. See text for interpretation. a. Males. b. Females.
FIGURE 4 in External morphology and osteology of Darevskia rudis (Bedriaga, 1886), with a taxonomic revision of the Pontic and Small-Caucasus populations (Squamata: Lacertidae)
FIGURE 4. ANOVA-differences (P <0.01) derived tree, combined males and females. See text for interpretation.
FIGURE 2 in External morphology and osteology of Darevskia rudis (Bedriaga, 1886), with a taxonomic revision of the Pontic and Small-Caucasus populations (Squamata: Lacertidae)
FIGURE 2. Canonical Discriminant Analysis (CDA) plots for a. males (above) and b. females (below). Specimens, sample centroids and group perimeters are represented. For details, percentage of variance explained, etc. see text.
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