Yazar "Selcuk, Ahmet Yesari" seçeneğine göre listele

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    Complete mitogenomes of Turkish tree squirrels, Sciurus anomalus and S. vulgaris, (Sciuridae: Rodentia: Mammalia) and their phylogenetic status within the tribe Sciurini
    (Elsevier, 2022) Ibis, Osman; Selcuk, Ahmet Yesari; Teber, Saffet; Baran, Mehmet; Kaya, Alaettin; Ozcan, Servet; Kefelioglu, Haluk
    The genus Sciurus, a member of the family Sciuridae, is widely distributed in the Holarctic region. To better understand mitogenomic characteristics and to reveal internal phylogenetic relationships of the genus, 20 complete mitogenomes of Turkish tree squirrels were successfully sequenced for the first time, including 19 for S. anomalus (from 16,505 bp to 16,510 bp) and one for S. vulgaris (16,511 bp). The mitogenomes of two species were AT-biased. All tRNAs for two species displayed a typical clover-leaf structure, except for tRNA(Ser(AGY)). The tRNA Serine1 (S1)-GCT structure lacked the dihydrouridine (DHU) loop and stem. Based on mitogenomic dataset for phylogeny of Sciurinae, phylogenetic analyses (Bayesian Inference and Maximum Likelihood) did not support monophyly of Sciurus and proposed that S. anomalus, the most basal taxa in the Sciurini tribe, had at least five mitogenome lineages, which were also supported by network analysis. The dissimilarities among the five line-ages of S. anomalus ranged from 0.0042 (0.42%) to 0.0062 (0.62%) using K2P sequence pairwise distances. In addition to this mitogenomic analysis result, phylogenetic analyses using the CYTB +D-loop dataset proposed the existence of at least nine lineages for S. anomalus, which was different than those of the previous studies. The current study proposed that the use of mitogenomic data for reconstructing the phylogeny of Turkey's Sciurus holds an important value for revealing evolutionary relationships.
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    Differences in shape and size of skull and mandible in Talpa species (Mammalia: Eulipotyphla) from Turkey
    (Taylor & Francis Ltd, 2019) Selcuk, Ahmet Yesari; Kaya, Alaettin; Kefelioglu, Haluk
    We analysed with landmark-based images morphological differences between four species of Talpa which resemble each other morphologically and are all highly adapted to underground life. Subtle shape differences of the skull and mandibular bones were found between all species. However, there is also broad overlap between all species. Talpa caucasica had the largest skull and mandibles, and Talpa levantis the smallest.
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    Geomorphometric differences among four species of Microtus in Turkey (Mammalia: Rodentia)
    (Taylor & Francis Ltd, 2018) Selcuk, Ahmet Yesari; Kaya, Alaettin; Kefelioglu, Haluk
    In order to determine the phenotypic associations of four morphologically similar species of Microtus occurring in Turkey, we applied landmark-based shape analysis. The skulls of Microtus anatolicus, M. dogramacii, M. guentheri and M. levis (= M. rossiaemeridionalis) were found to differ significantly in terms of both size and shape. M. guentheri had the biggest skull, while M. levis had the smallest. Sexual dimorphism was found in the shape of the skull in M. dogramacii and M. levis. The tympanic bulla area is enlarged in M. anatolicus compared to the other species. Mahalanobis distances (the distance between a point and the group mean, taking into account the within-group covariance-variance matrix) confirm the distinction of the arvalis group (M. levis) and socialis group (Microtus anatolicus, M. dogramacii, M. guentheri).