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Pregnancy is a physiological cost of reproduction for animals that rely on fleeing to avoid predators. Costs of reproduction are predicted to differ between alternative reproductive strategies or modes, such as egg-laying (oviparity) or live-bearing (viviparity). However, disentangling the factors that comprise this cost and how it differs for oviparous or viviparous females is challenging due to myriad environmental, biological, and evolutionary confounds. Here, we tested the hypothesis that costs of pregnancy differ between oviparous and viviparous common lizards (Zootoca vivipara). We predicted that the degree of locomotor impairment during pregnancy and therefore the cost of reproduction would be higher in viviparous females. We conducted our experiment in a hybrid zone containing oviparous and viviparous common lizards. Due to the common environment and inclusion of hybrid individuals, we could infer whether differences were inherent to parity mode. We found that the average and maximum running speed of pregnant females was slower than after they had given birth or laid eggs. Viviparous females experienced an additional pregnancy weight burden and for a longer time period, but were not slower at running than pregnant oviparous females. In addition, we found a parity mode-specific effect of reproductive investment; producing larger clutches was costlier for the locomotor performance of viviparous females for reasons other than the mass increase. Locomotor costs were found to be intermediate in hybrid females, indicating that they are specific to each reproductive mode. Our study shows that viviparous females experience an additional physical and physiological cost of pregnancy and reproductive investment. This two-fold cost implies that viviparous females modulate resource allocation decisions and/or adjust their behavioural responses that result from locomotor impairment.

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Microplastics are a global environmental problem, polluting both aquatic and terrestrial environments. Terrestrial lizards are suitable model organisms to study human-induced pollution in these areas, as they can live in urbanized areas where microplastics are most abundant. Therefore, we analyzed the prevalence of microplastics (MPs) in a common Lacertid lizard, the snake-eyed lizard, Ophisops elegans. We detected MPs in the gastrointestinal tract (GIT) of 33 of 152 specimens from 18 populations. The detected MPs had six distinct polymer compositions, namely Polyethylene terephthalate, Polyacrylonitrile, Polypropylene, Polyethylene, Poly methyl methacrylate and Polyamide. The majority of these MPs were fiber-type and the dominant color was navy blue. The lengths of MPs varied from 37 to 563 µm, with an average length of 175 ?m. MPs were detected in the GITs of 43% of juveniles (n = 7), 30% of males (n = 105), and 18% of females (n = 40), with a mean of 0.27 per specimen. Furthermore, we found that microplastic densities varied with habitat distance from human settlements, supporting the theory that high levels of microplastic contamination are associated with extensiveanthropogenic activity.

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Kestert is a village on the right bank of the Rhine in the Upper Middle Rhine Valley. At the river bend it extends to a south-faced steep rocky slope of more than 200 meters, where in March 2021 a substantial (15k tons) rock slide occurred which covered not just the road and the tracks but also the western end of the habitat of the Western Emerald Lizard as well as of the Common Wall Lizard, both being legally protected species. In the area, the Western Emeral Lizard is the more susceptible species as it is living here on the north rim of its distribution. The land is managed by the German Railways. After a field visit by naturalists and herpetologists in June 2021 the buried land has been restructured meticulously with a view to technical necessities and the utmost conservation of untouched areas as well as the restoration of the buried sites into well-structured, locally adapted structures carrying local rock and local vegetation. For a rock slide capturing basin, there is now a dry south slope and a moister east slope which runs parallel to a non-perennual creek, which had to be carefully excavated. The measues have been very successful with wall lizards on the south and emerald lizards on the east slopes. The first emerald lizard juveniles have been found venturing towards the east slope in late summer 2023, and in spring 2024 the first adults have extended their territories into the east slope, all originating from neighbouring lands in the north and the east. In spring 2024 the first adult pair of wall lizards was seen in the south slope, obviously originating from the East-running railway tracks. Due to the conservation of vegetation and the speedy and insect-friendly re-vegetation, both species have invaded their sites one year earlier than expected. The original landscape, the slide and the restoration of the site as well as the lizards from the site are shown in the figures, and the plants are listed in the tables.

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The variability in behavioural syndromes at different scale levels (e.g., within population or among species) is relevant in ecological and evolutionary patterns. It provides the basis on which natural selection can act to promote evolutionary processes. Additionally, behavioural syndromes can be seen as a form of pre-adaptation, favouring a species’ ability to cope with novel selective pressures, establish in new habitats, enhancing population stability, and dealing with deseases and parasites. We assessed repeatability (two replicates for individual) for five behavioural traits (activity, boldness including components of exploration and escape, sociability, and foraging activity) and tested the occurrence of behavioural syndromes in both sexes of three taxa of lacertid lizards: two clades of the common wall lizard (Podarcis muralis maculiventris and P. m. nigriventris), and the Italian wall lizard (Podarcis siculus). All behavioural traits except sociability were repeatable in all the three taxa. Our findings clearly reveal the occurrence of a behavioural syndrome related to the propensity to move through and explore new enviroments, escape from predation risk, and successfully capture prey. We also provide empirical evidence for higher repeatability of behaviours in males compared to females, as well as differences in behavioural syndromes at the taxon-level. These results support the occurrence of personality in both common and Italian wall lizards, highlighting marked variability in personality across different scales. This variability could ultimately reflect the interaction between the specific needs inherent in both sexes within each species, and the environmental/competitive context in which these needs are fulfilled.

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An analysis of the diets of reptiles is essential for understanding the role of reptiles in the ecosystem and the employment of successful conservation management plans. For this purpose, noninvasive and invasive methods to identify consumed prey have been used. Here, we investigated the diet of male and female European Green Lizards (Lacerta viridis) by sampling fecal pellets across 2 yr in the spring and late summer at a single site. We used the following two methods for identifying prey remnants from fecal samples: the classical macroscopic approach that requires competent expert knowledge and the molecular approach based on the dietary metabarcoding of nondegraded prey remnant DNA. According to both methods, lizards consumed mainly insects belonging to 13 orders, with Coleoptera as the dominant prey. The number of prey taxa was similar between the sexes, but the prey composition at the genus level was significantly different, with males capturing some coleopterans more than females. The diets also differed significantly between season. In the spring, lizards consumed many more prey types and many more coleopteran specimens than in late summer. The proportion of identified prey taxa was significantly different between the identification methods. From the total of identified prey, macroscopic identification yielded only about 50% of taxa, whereas molecular identification yielded more than 80% of taxa. Our results show that molecular identification can recover a much higher number of prey than the macroscopic method, yet not all prey. Thus, the integration of both methods best described the natural diet and complex trophic interactions of European Green Lizards.

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The eastern green lizard (Lacerta viridis) is a mostly insectivorous species, based on multiple studies from across its range. However, for Bulgaria the published data of such kind are limited to five publications. We investigated faecal samples from a total of 60 individuals of free-ranging L. viridis obtained from two localities in western Bulgaria. Our aim was to clarify the diet regarding its taxonomic composition, as well as some physical characteristics of the prey like hardness and evasiveness. For one of the study sites we compared the realised trophic niche (prey items from the faecal pellets) with the fundamental niche (invertebrates collected via pit-fall traps exposure). In our results, two invertebrate taxa had the largest share (both in frequency and abundance) in the food spectrum of L. viridis: Araneae and Coleoptera), respectively 21.2% and 17.6%. Regarding specific prey selectivity, analysis showed that Lepidoptera are most preferred (E* = 0.68), and Formicidae – most avoided prey items (E* = -0.79). We registered several cases of saurophagy (in four samples) and keratophagy (in two samples), two types of dietary items, which have not been reported for L. viridis so far.

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During naturalistic research performed in August of 2022 and 2023 in several Aegean islands, three new herpetological records occurred: Hemorrhois nummifer on Telendos Island, Laudakia stellio on Pserimos Island and Dolichophis caspius on Kitriani Islet.

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Homing abilities of lizards after experimental dislocations have been found to be well developed in several species. Following our preliminary findings in Podarcis siculus, the present paper reports a new series of experiments on homing performances and initial orientation behaviour upon release. For this purpose, three series of releases were performed at increasing distances from the home areas in which the lizards were captured (range 85–245 m). In each series, two groups of lizards were released: the route-based visual cues during displacement were denied to one of them (NVIS), but allowed for the other (YVIS). The results of initial orientation showed that both are significantly homeward oriented at all three distances tested. Male and female YVIS and female NVIS are similarly homeward oriented, while the male NVIS are not. All 74 lizards successfully returned to their respective home areas. Eleven lizards homed on the same day they were released, while most of them homed during the 1st day after release (n = 51) and the rest on the 2nd day (n = 12). The different transport treatments did not influence homing success at the different distances tested. These results seem to support the use of a geocentric pilotage strategy to re-enter home from the release spot. Alternatively, the possibility that P. siculus use a sun compass and a mosaic map to find their way home is also discussed.

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Anthropogenic changes, such as land use, are the main drivers causing climate change and biodiversity loss, with hundreds of thousands of species lacking sufficient habitats for their populations to persist and likely to go extinct within decades. Endemic species are more susceptible to habitat changes and are at the forefront of the biodiversity crisis. We used species distribution models to generate a relative habitat suitability map and identified the habitat requirements of the critically endangered and endemic Be`er Sheva fringe-fingered lizard {Acanthodactylus beershebensis). The model showed that the species` suitable habitats are associated with arid loess plains characterized by scattered, low vegetation cover, primarily on north-facing aspects, suggesting that these species-specific habitat requirements limit its distribution. The size of the potentially suitable area within the species` historical range is 1350.73 km2. However, anthropogenic changes decreased the remaining suitable habitat to 995.04 km2. Most of this area is unprotected and at risk of further adverse anthropogenic effects. Only 91.72 km2 of this area is protected by the Israel Nature and Parks Authority, and 587.11 km2 may be considered indirectly protected because it is within military firing zones. Our study is the first attempt to map the remaining suitable habitat of A. beershebensis based on the results of a species distribution model. The results of this model can assist in prioritizing the protection of areas needed for the conservation of this critically endangered and endemic lizard species.

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During a resettlement of reptiles from a planned construction area in the Brandenburg municipality of Velten, the effectiveness of drift fences was compared with bucket traps, wooden sheets and catching by hand for the capture of sand lizards, common lizards and slow worms. Of the two lacertid species, over 90% of the individuals were caught in the trapping fences, whereas more than 43,5% of the slow worms were found under wooden boards and 56,6% in trapping fences. In addition to the results on the efficiency of the catching methods, data on the phenology and annual activity of the three species are presented.

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I am passionate on keeping and breeding Ocellated Lizards for many years. Here, I report on the construction of an outdoor terrarium and my first experiences of keeping lizards outdoors!

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The article informs about the occurrence of bark ulcers / skin tumours in lacertids, which are fatal for the affected animals during the course of the disease. Against this background, the author calls for information or photos of affected animals. The aim is to analyze the disease in detail on a broader information basis and ideally a therapy can be developed.

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Brief presentation and classification of the long overlooked Nucras ukerewensis Bolkay, 1909 from northern Tanzania.

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Female mate choice based on male phenotypic traits is controversial in lizards, particularly in territorial species. In this study, we examine female choice of male scent marks in a territorial lacertid lizard (Podarcis hispanica) in which scent marks have been shown to signal male size (i.e., an important determinant of competitive ability in this species). Females were simultaneously exposed to three naturalized 4 m2 choice areas bearing: (1) no scent marks (i.e., control), (2) scent marks of large males, and (3) scent marks of small males. Although female lizards preferentially associated with scent marked choice areas, we found no evidence that females chose territories marked by large males. Furthermore, in response to experimentally induced dusk at the end of choice trials, females preferentially took shelter in refuges scent marked by small males. Our results suggest that, like males in this species, females are able to use male scent marks to assess the body size of resident territorial males, but do not show a preference for territories occupied by large males.

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The interplay between morphological (structures) and behavioral (acts) signals in contest assessment is still poorly understood. During contests, males of the common wall lizard (Podarcis muralis) display both morphological (i.e. static color patches) and behavioral (i.e. raised-body display, foot shakes) traits. We set out to evaluate the role of these putative signals in determining the outcome and intensity of contests by recording agonistic behavior in ten mesocosm enclosures. We find that contests are typically won by males with relatively more black coloration, which are also more aggressive. However, black coloration does not seem to play a role in rival assessment, and behavioral traits are stronger predictors of contest outcome and winner aggression than prior experience, morphology, and coloration. Contest intensity is mainly driven by resource- and self-assessment, with males probably using behavioral threat (raised-body displays) and de-escalation signals (foot shakes) to communicate their willingness to engage/persist in a fight. Our results agree with the view that agonistic signals used during contests are not associated with mutual evaluation of developmentally-fixed attributes, and instead animals monitor each other to ensure that their motivation is matched by their rival. We emphasize the importance of testing the effect of signals on receiver behavior and discuss that social recognition in territorial species may select receivers to neglect potential morphological signals conveying static information on sex, age, or intrinsic quality.

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1. Female and male hosts may maximise their fitness by evolving different strategies to compensate for the costs of parasite infections. The resulting sexual dimorphism might be apparent in differential relationships between parasite load and body condition, potentially reflecting differences in energy allocation to anti-parasitic defences. For example, male lacertids with high body condition may produce many offspring while being intensely parasitised. In contrast, female lacertids may show a different outcome of the trade-offs between body condition and immunity, aiming to better protect themselves from the harm of parasites. - 2. We predicted that females would have fewer parasites than males and a lower body condition across parasitaemia levels because they would invest resources in parasite defence to mitigate the costs of infection. In contrast, the male strategy to maximise access to females would imply some level of parasite tolerance and, thus, higher parasitaemia. - 3. We analysed the relationship between the body condition of lizards and the parasitemias of Karyolysus and Schellackia, two genera of blood parasites with different phylogenetic origins, in 565 females and 899 males belonging to 10 species of the Lacertidae (Squamata). These lizards were sampled over a period of 12?years across 34 sampling sites in southwestern Europe. - 4. The results concerning the Karyolysus infections were consistent with the predictions, with males having similar body condition across parasitaemia levels even though they had higher infection intensities than females. On the other hand, females with higher levels of Karyolysus parasitaemia had lower body condition. This is consistent with the prediction that different life strategies of male and female lacertids can explain the infection patterns of Karyolysus. In contrast, the parasitaemia of Schellackia was consistently low in both male and female hosts, with no significant effect on the body condition of lizards. This suggests that lizards of both sexes maintain this parasite below a pathogenic threshold.

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Lacertid and amphisbaenian lizards are two squamate reptile lineages very divergent morphologically. In fact, adaptation to burrowing deeply modified amphisbaenian worm-like body. Lacertids instead have a typical reptile morphology with a long tail and four well-developed limbs. Despite so different in appearance, they are evolutionarily very close as evidenced by molecular phylogenetic approaches. Consistently, a slow-evolving satellite DNA (IMO-TaqI) described in lacertid lizards was isolated from the genome of the amphisbaenian Trogonophis wiegmanni too. Comparison with lacertid repeats evidenced great similarity, highlighting that molecular characters appeared very suitable especially when morphology is subjected to strong selective pressures.

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For the first time, a record of Italian Wall Lizard Podarcis siculus (Rafinesque-Schmaltz, 1810) in Krasnodar is noted. The origin of this lizard, presumably, is associated with the importation of large-sized planting material. In addition, for the first time, reproduction of Red-eared Slider, Trachemys scripta elegans (Wied-Neuwied, 1839), in the nature was revealed near Sochi; the data from the moment of oviposition to the emergence of newborns from nesting chambers were collected. The size and color characteristics of T. scripta found in Sochi are described. Active resettlement allowed T. scripta to occupy the entire Imeretinskaya Lowland and the valley of the lower reaches of the Psou River. Monitoring of Podarcis siculus in the environs of Sochi indicates an increase in the range by almost eight times, with a modern habitat area of 200.6 ha. The high population density and a large number of young individuals clearly show the transition of the species from alien to invasive status. A new find in November 2021 of Mediterranean House Gecko, Hemidactylus turcicus (Linnaeus, 1758) indicates the strengthening of this exotic animal in the resort and a slight expansion of the range, about 1 km east of the initial record in Sochi. All of the listed species are, to varying degrees, synanthropic, what also contributes to their active distribution in the region.

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Compared to other reptile groups in Europe, lizards have generally been neglected and understudied in terms of microbiota research. In this study, we aimed to isolate, identify and characterize the aerobic cloacal microflora of wild-dwelling lizard hosts. We examined a total of 86 individuals from five species belonging to three families: the European green lizard (Lacerta viridis), the common wall lizard (Podarcis muralis), the meadow lizard (Darevskia praticola) (Lacertidae), the European snake-eyed skink (Ablepharus kitaibelii) (Scincidae) and the European slow worm (Anguis fragilis) (Anguidae) which co-occur in a low-mountain region in Western Bulgaria. In general, a similar composition of the resident microbial communities in the cloaca was found, accompanied by variation in the relative abundance of some bacterial taxa between the lizard species. A variety of Gram-negative and Gram-positive bacteria was isolated from the cloacal samples. Some of these bacteria are also known as opportunistic pathogens, both for hosts and humans. The bacterial species Hafnia alvei, Pseudomonas aeruginosa, Klebsiella oxytoca and representatives of Enterobacter spp., Citrobacter spp. and Enterococcus spp. were among the most prevalent.

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Organisms face numerous environmental stressors, which can affect developmental precision, including symmetry of various physical characteristics. Fluctuating asymmetry (FA) has therefore been suggested as a simple and efficient tool for assessing sub-lethal stress levels. We analyzed FA in two sympatric lizard species (Iberolacerta horvathi and Podarcis muralis) to determine potential effects of interspecific competition and urbanization, as proxies of stress, taking into account sexual dimorphism and environmental conditions. We sampled 16 syntopic and allotopic populations and used geometric morphometrics of head morphology. We detected significant but mixed effects on the head asymmetry from the environment and the syntopic occurrence that differed between species. P. muralis lizards had more asymmetric heads at higher altitudes, while I. horvathi lizards did at mid altitudes, which may be explained by P. muralis experiencing environmental stress of colder conditions at higher altitudes. The mid-altitude effect on asymmetries in I. horvathi might be explained by a lower availability of stony walls and higher abundance of P. muralis, thus higher competition. The asymmetry of supraciliary granules was affected by the presence of other species. However, lizards from allotopic populations attained larger asymmetries compared to lizards from syntopic populations, which was the opposite from what was expected. There was no effect of urbanization in P. muralis, which could be due to relatively low pollution and habitat degradation in study locations. Overall, we highlighted the possibility of using lizards and FA for bioindication of environmental stressors and especially improved the knowledge gap in the research of biotic stressors.

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It was found color variability sand lizard on research during 2013–2014 years on the territory of Ukrainian Roztochia (Lviv region.). The studies were conducted in areas with different habitats. Color variability manifested in the types of color and pattern. It was found individuals of subspecies belonging of the territory. Show the characteristic patterns for L. a. chersonensis and L. a. argus. Also found zone intergradation between subspecies L. a. chersonensis and L. a. exigua. We found two types of aberrations pattern maculata and erythronota. The dependence of L. agilis coloration of environmental conditions, expressed in lizards from different habitats on the territory of research.

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Alpine ecosystems harbour a rich and highly specialised biodiversity, which is particularly susceptible to anthropogenic disturbances such as habitat loss and fragmentation as well as to climate change. Combined with other forms of land-use conversion, construction and maintenance of ski resorts can have severe consequences on alpine biodiversity. In this study, we show how one amphibian and two reptile species, namely Rana temporaria, Zootoca vivipara and Vipera berus, respond to such impacts by means of a multi-season occupancy analysis. We found all three species both in and outside ski-runs, showing that these habitats do not necessarily preclude their occurrence. Contrarily, this is influenced more by microhabitat availability, such as ground vegetation, humid areas and rock cover, rather than by macro-characteristics like elevation or habitat type. Moreover, we found a climatic influence on the year-to-year occupancy change of the species, with activity-month conditions being more relevant than overwintering ones. Our results demonstrate how, in the specific case of reptiles and amphibians, ski resorts do not necessarily limit species` occurrence and that a mild series of management actions might secure the species` persistence in the area.

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Over the years, the terminology in regards to the abnormal coloration of reptiles and amphibians hasbecome more complex with not all authors agreeing on the same terms. This, combined with the diversity of chromatic abnormalities, has led to some confusion, particularly between hobbyists and biologists who tend to use different jargon. In this review, we aim to address this issue by explaining how color within the skin of amphibians and reptiles arises, and evaluating which terminology should be used. This information is then used to explore each of the known chromatic abnormalities observed in amphibians and reptiles before summarizing the known cases from the British Isles. Finally, we also present a number of previously unrecorded instances of color abnormalities in the hope that it promotes further examples to be recorded. Given their rarity in nature, color abnormalities are likely to have a significant impact on the fitness of animals displaying them. Despite our efforts to summarize all the available information on color abnormalities in the herpetofauna of the British Isles, there are still gaps in our knowledge. These could be filled through the effort of a national recording scheme aimed at abnormally colored individuals.

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From the beginning of the 19th century to the present, the authorship of the description of the Balkan wall lizard, Podarcis tauricus (Pallas, 1814) was considered undoubted. Recently, Schmidtler (2022) has been concluded that the description of this species should be attributed to J.G. Georgi. Therefore we have chosen to discuss this issue. The description of Lacerta taurica by Georgi in 1801 was based on earlier works by C.L. Hablitz (1785, 1789). However, his description does not align with our current understanding of the morphological and ecological characteristics of the taxon currently recognized as P. tauricus. Some details contained in this description suggest that it was based not on the species recently known as Podarcis tauricus, but on another lizard inhabiting the same place and recently known as Darevskia lindholmi (Szczerbak, 1962). If recognize authorship of the name Lacerta taurica as belonging to Georgi (1801), this would require transferring that name to the species currently known as D. lindholmi and the need to introduce a new name for the species currently known as P. taurica, that will cause numerous confusions. To provide the stability of the names, we suggest to continue to regard Pallas (1814) as the author of the name Lacerta taurica and will apply to the Commissuion of Zoological Nomenlature for conservation of this status. Regrettably, a specimen collected by Pallas himself in Crimea has not been located until now. However, the search for preserved historic specimens continues.