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Öğe A contribution to the biogeography and taxonomy of two Anatolian mountain brook newts, Neurergus barani and N. strauchii (Amphibia: Salamandridae) using ecological niche modeling(Tubitak Scientific & Technical Research Council, 2021) Kurnaz, Muammer; Şahin, Mehmet KürşatThe Anatolian newt, Neurergus strauchii, is an endemic Anatolian species. Until recently, N. strauchii was represented by three subspecies. It has been discussed within a recent phylogenetic study in which the subspecies N. s. barani is recommended to be evaluated as a cryptic but distinct species. To address this subject, we aimed to discuss the niche differentiation between N. barani and N. strauchii using geographical and bioclimatic aspects. All georeferenced data of N. barani and N. strauchii were used to estimate the potential distributions of these species in the Anatolian Peninsula. To evaluate their ecological niche differentiation, point-based analysis and niche similarity tests were done. Ecological niche modeling outcomes demonstrated a significant niche differentiation between N. barani and N. strauchii. Moreover, since these species are distributed in the east and west of the Euphrates Basin, this river might be considered as a geographic barrier that can cause isolation for these species. Lastly, we demonstrated their potential distributions for future with several scenarios. Our findings strengthened the results of the recent phylogenetic study and indicated the necessity of handling "barani" taxa at the species level. Moreover, these results contribute, as a piece of evidence, to the biodiversity of Anatolia where another endemic species lives.Öğe Contribution to the taxonomic knowledge of Acanthodactylus (Squamata, Lacertidae): Description of a new lacertid lizard species from Eastern Anatolia, Turkey(Arak Univ., 2021) Kurnaz, Muammer; Şahin, Mehmet KürşatAcanthodactylus Wiegmann, 1834 is one of the most diverse and widespread lizard genus in the Palearctic realm. Here, we describe a new species, - Acanthodactylus ilgazi sp. nov. - from the Anatolian Peninsula. This new species ranges approximately 250 km north from the closest population of this genus in Turkey. Compared to other fringe-fingered lizards, the new species is phylogenetically close to A. robustus, A. tristrami and A. orientalis but it has some distinct morphological characteristics: reddish coloration under the tail, a sharp white or grayish stripe in the middle of the dorsum, and four plates in a row on the 4th finger. Moreover, phylogenetic molecular data, based on cyt b gene fragment, verifies that the new species is phylogenetically a member of the tristrami species group with 13.03%, 17.35% and 20.56 genetic distance respectively from A. orientalis, A. tristrami and A. robustus. Lastly, the known range of this species, located in Yazihan, Malatya in Eastern Anatolia, is restricted by a dam, thus habitat loss endangers its continuity. Therefore, the conservation status of this species should be assessed immediately.Öğe Hidden diversity in a narrow valley: description of new endemic palearctic rock lizard darevskia (squamata: lacertidae) species from northeastern Turkey(Bıodıversıty Research Center, 2022) Kurnaz, Muammer; Şahin, Mehmet Kürşat; Eroğlu, Ali İhsanDarevskia is a particularly species-rich radiation of Palearctic rock lizards from the Caucasus region. Thanks to intense systematic and taxonomic research, the knowledge of species-level diversity within this genus has increased over the last quarter century. Here, we described a new species, Darevskia salihae sp. nov. from northeastern Turkey. The new taxon is differentiated from other nearby taxon by the low number of dorsal scales in the middle of the body, the shorter body length, and the absence of blue dots both on the lateral region above the forelimbs and on the margin of the ventral plates. In addition to their morphological differences, the new taxon is phylogenetically different from close groups. It is located in a separate subclade from the rudis-valentini-portschinskii subclade. This distinction is supported by both a high bootstrap value (100) and a high posterior probability value (1.00). These two subclades are separated from each other by a genetic distance of almost 4%. This separation is supported not only genetically and morphologically, but also geographically. Since the habitat of the new taxon is limited to a high mountain and a narrow valley, it does not provide an opportunity for a different Darevskia species to shelter because it creates geographical isolation. However, Darevskia parvula that live closest to the habitat of the new taxon live only at the habitat boundaries and do not enter areas where the new taxon is found. Therefore, it might be possible that while it was separated from the rudis-valentini-portschinskii group during the evolutionary transformation, it remained as a refuge and relict in a narrow area as a result of the collapse of the valleys and the partial uplift of the Kackar Mountains.Öğe Unusual activity patterns in anuran and urodela species during the hibernation period(Karamanoğlu Mehmetbey Üniversitesi, 2025) Bayram, Çağatay; Şahin, Mehmet Kürşat; Kurnaz, MuammerHibernation is an important strategy that allows amphibian species to survive in cold weather conditions by minimizing their metabolic activities. This study reports unusual activity patterns of 7 different amphibian species across Türkiye. The findings, based on 16 different observation data, reveal that these species exhibit different behaviors during the winter period, a time when they are typically inactive. During the observations, it was found that soil and air temperatures are related to the timing of the species, activities. The data suggests that the movement of these species during this period could be triggered by local temperature increases or other environmental variables. Notably, some species were observed to surface or become active in response to short-term temperature increases. This phenomenon is important for studying the effects of global climate change on amphibian species. However, the ecological consequences of these behaviors, such as their impact on energy expenditure and predation risk, have not yet been fully understood. The findings of this study aim to contribute to the understanding of the ecological and environmental impacts of unusual activity during the hibernation period. Furthermore, they provide valuable insights into the ecology of amphibian species in Türkiye, offering important clues for conservation biology.Öğe Unusual winter activity observations of two newt species (Ommatotriton ophryticus & Triturus ivanbureschi) from the Anatolian Peninsula(2021) Kurnaz, Muammer; Şahin, Mehmet KürşatInteractions between the internal regulation and the environment drive thebiophysiological patterns of amphibians. It is well known phenomenon that newts in the northernhemisphere are tend to have hibernation strategies in winter seasons. However, the winter activityrecord for newts is quite rare. Therefore, we would like to report two winter activity cases fromAnatolia, Turkey via two newt species: The northern banded newt (Ommatotriton ophryticus) fromOrdu and Balkan crested newt (Triturus ivanbureschi) from Çanakkale. The striking outcomes ofthis study are that the Northern Banded Newt demonstrates winter activity from another localityapart from Trabzon, and the Balkan Crested Newt has been observed in winter for the first time inits natural habitat. However, it is more important that to document these winter activities areremarkable to provide valuable preliminary data for interpreting the global climate changedynamics in local cases.
