Browsing by Author "Ayan, S."

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A Bibliometric Analysis of Scientific Research in Türkiye on National Parks Between 2002 and 2021
(Istanbul University-Cerrahpasa, 2024) Yelsiz, M.Ş.; Yücedaǧ, C.; Çiçek, N.; Ayan, S.
In Türkiye, national parks play a prominent role among protected areas. Besides meeting people's recreational needs, these protected areas are home to natural and cultural resources. As a result, numerous research has been conducted to find out more about assets and recreational uses of these areas. In this study, the bibliometric analysis method was used to examine research published in Türkiye on national park between 2002 and 2021 within the scope of Clarivate Analytics' Web of Science (WoS). For this purpose, 156 publications, selected from the WoS database, were analyzed. The year 2017 had the most publications. In addition to Türkiye, significant countries in the spatial distribution analysis of national parks included the United States and Italy. About 338 authors in all were included in the author analysis for the publications from national parks. The current study found that 117 different institutions had publications about the national park. The highest number of publications and citations originated from Karadeniz Teknik and Kastamonu Universities, respectively. In this study, the WoS database was used as search engine because it is the most frequently preferred and recognized database, containing all records of high-quality research publications and continuing to be regarded as one of the primary sources of bibliographic information. However, some publications in other databases, such as Scopus and Google Scholar, cannot be overlooked in further research.
A Bibliometric Analysis of Scientific Research in Türkiye on National Parks Between 2002 and 2021
(2024.01.01) Yelsiz, M.S.; Yücedag, C.; Çiçek, N.; Ayan, S.
In Turkiye, national parks play a prominent role among protected areas. Besides meeting people's recreational needs, these protected areas are home to natural and cultural resources. As a result, numerous research has been conducted to find out more about assets and recreational uses of these areas. In this study, the bibliometric analysis method was used to examine research published in Turkiye on national park between 2002 and 2021 within the scope of Clarivate Analytics ' Web of Science (WoS). For this purpose, 156 publications, selected from the WoS database, were analyzed. The year 2017 had the most publications. In addition to T & uuml;rkiye, significant countries in the spatial distribution analysis of national parks included the United States and Italy. About 338 authors in all were included in the author analysis for the publications from national parks. The current study found that 117 different institutions had publications about the national park. The highest number of publications and citations originated from Karadeniz Teknik and Kastamonu Universities, respectively. In this study, the WoS database was used as search engine because it is the most frequently preferred and recognized database, containing all records of high-quality research publications and continuing to be regarded as one of the primary sources of bibliographic information. However, some publications in other databases, such as Scopus and Google Scholar, cannot be overlooked in further research.
Changes in the Potential Distribution of Atlas Cedar in Morocco in the Twenty-First Century According to the Emission Scenarios of RCP 4,5 and RCP 8,5
(2024.01.01) Laaribya, S.; Alaoui, A.; Ayan, S.; Dindaroglu, T.
The increasing temperatures and decreasing rainfall are expected to have negative effects on ecosystem services causing significant shrinkage or shift in forest distributions particularly in the Mediterranean basin. In this study, we aimed to determine the distribution of Atlas cedar ( Cedrus atlantica Manetti), modeling the current and potential future distributions in Morocco with Maximum Entropy (MaxEnt) approach. Modeling was performed using all bioclimatic variables that show a significant relationship to the current distribution of Atlas cedar and that were specifically preferred in the literature by several similar studies. Prediction of warmer future scenarios showed that populations in the potential area would decrease by 21% for RCP 4.5 (2050), by 23% for RCP 4.5 (2070), by 35% for RCP 8.5 (2050), and 41% for RCP 8.5 (2070) and that there would be an impact in all ranges including the Cedar Biosphere Reserve in Morocco. Similarly, the Atlas cedar would lose its isolated-marginal populations in its southern and western extents. The results underline the importance of a genetic conservation program for cedar populations in Morocco. Otherwise, gene pools seem to turn extinct due to climate change. Furthermore, this study is intended to provide a starting point for continuous monitoring of Atlas cedars distributions while observing its climatic migration. Species distribution modeling generates valuable information for conservation management strategies for this endemic, rare, and threatened relict tree species. The results can be used to identify high-priority areas for Atlas cedar restoration and conservation against the expected impact of climate change.
Correction to: Genomic diversity of major tree species in the Eurasian relict forests of northern Iran (Tree Genetics & Genomes, (2024), 20, 5, (35), 10.1007/s11295-024-01670-w)
(Springer Science and Business Media Deutschland GmbH, 2024) Vatanparast, M.; Madsen, P.; Sagheb-Talebi, K.; Larsen, J.B.; Ayan, S.; Hansen, O.K.
The original version of this article unfortunately contained a mistake. Author “Khosro SaghebTalebi” wants to correct his affiliation to “Research Institute of Forests and Rangelands (RIFR), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.” The original article has been corrected.
Effect of Fungal Lesions on the Wood Density of Silver Fir ( Abies alba L.) in Ukrainian Carpathians
(2024.01.01) Sopuhsynskyy, I.; Kopolovets, Y.; Kharyton, I.; Ayan, S.
The research has covered the biological wood resistance in terms of reducing its wood density of Silver fir growing in the Ukrainian Carpathians. Six Silver fir stands were placed in the State Enterprise Perechyn Forestry, in which were cut 54 model trees with varying decay stages. All qualitative characteristics of Silver fir wood were diagnosed by the European norms. Altogether, 1620 wood samples were studied. The start of biological damage to wood was defined as the cessation of cambial activity and drying of the tree crown, as well as diagnosed fungal lesions. As a result, there were significant differences in wood density with a different timeframe of decay stages of wood. The basic density of healthy wood varied from 362 kgm -3 to 457 kgm -3 with an average value of 392 kgm -3 , and the same figure for wood with significant damage ranged from 195 kgm -3 to 283 kgm -3 with an average value of 246 kgm -3 . This should be associated with the biological destruction of the cell wall affected by fungi from division Basidiomycota. Four significant decay stages of Silver fir stemwood taking the lesioned time by the equal variances estimated through Scheff & eacute;'s Method were set: (1) healthy wood without signs of biological damage by fungi; (2) initial wood damage caused by wood-staining fungi within up to 6 months; (3) medium wood damage caused by wood-destroying fungi within the timeframe from 0.5 to 2 years; and (4) substantial wood damage caused by wood-destroying fungi for more than 2 years.
Effects of Nanoparticle Applications on Seedling Survival and Morphological Characteristics in Scots Pine Afforestation
(2023.01.01) Ayan, S.; Çelik, E.N.Y.; Gülseven, O.; Yer, B.M.; Eskiömer, M.
This study was conducted in the afforestation area, using bare-root 2+0-year-old Scots pine seedlings from Kastamonu. The study aimed to determine the impact of nanoparticle (NP) applications on seedling morphological characteristics and seedling survival success. Three different concentrations (low, medium, high) and four different nanoparticle types [Fe3O4, CuO, ZnO, TiO2] were applied to the plant root-dipping method in the study. The effects of NP treatments on seedling height (SH), root collar diameter (RCD), stem fresh weight (SFW), root new weight (RFW), seedling fresh weight (SEFW), root dry weight (RDW), stem dry weight (SDW), seedling dry weight (SEDW), sturdiness quotient (SI), root: shoot ratio (R/S), and seedling survival in the field were evaluated. The study results revealed that NP types significantly affected all seedling variables except RFW, SDW, RDW, and SEDW, and NP doses significantly affected all seedling variables except RFW. The binary interaction effects of NP types and doses had a significant effect on all seedling variables, and higher values were obtained compared to the control treatment. Medium and high NP doses were more effective in seedling growth than low doses; the percentage of seedling survival was 61.4% in the control treatment and 95% in the TiO2-Medium NP treatment combination.
Genomic diversity of major tree species in the Eurasian relict forests of northern Iran
(Springer Science and Business Media Deutschland GmbH, 2024) Vatanparast, M.; Madsen, P.; Sagheb-Taleb,i K.; Larsen, J.B.; Ayan, S.; Hansen, O.K.
We investigated population genetics of the native tree species Acer velutinum Boiss., Fagus orientalis Lipsky, and Quercus castaneifolia C.A. Mey. in the Hyrcanian forests of northern Iran and also F. orientalis populations in the Euro-Siberian and Colchic subregions of northern Türkiye. We used the double-digest RADseq method and genotyped 90 populations and 1,589 individuals across the distribution range of the species. Genome-wide SNPs from 28 populations of A. velutinum, 32 populations of F. orientalis, and 30 Q. castaneifolia revealed higher genetic differentiation among A. velutinum populations than among F. orientalis and Q. castaneifolia. The global FST value was lowest for F. orientalis populations and highest for A. velutinum populations, while the global FIS value was negative for A. velutinum. Demographic history analysis revealed a bottleneck during the last glacial period (11,500—115,000 Kya) for the A. velutinum populations with reduced effective population size (Ne). All three species show multiple bottlenecks and reduced Ne during the Quaternary. Pronounced genetic divergence among A. velutinum populations in the Hyrcanian forests compared to the other two species suggests cryptic speciation. Conversely, F. orientalis and Q. castaneifolia populations showed low levels of genetic structure, suggesting that species-specific factors, such as pollen production and pollination efficiency, may have influenced the genetic patterns within these species in similar environments. The nucleotide diversity of F. orientalis populations in Iran is negatively correlated with altitude (p = 0.046). In contrast, A. velutinum populations show a significant correlation between nucleotide diversity and longitude (p = 0.008). Furthermore, the F. orientalis populations from Türkiye showed a distinct west–east genetic structure and were highly diverged from the Iranian F. orientalis populations.
Genomic diversity of major tree species in the Eurasian relict forests of northern Iran
(2024.01.01) Vatanparast, M.; Madsen, P.; Sagheb-Talebi, K.; Larsen, J.B.; Ayan, S.; Hansen, O.K.
We investigated population genetics of the native tree species Acer velutinum Boiss., Fagus orientalis Lipsky, and Quercus castaneifolia C.A. Mey. in the Hyrcanian forests of northern Iran and also F. orientalis populations in the Euro-Siberian and Colchic subregions of northern T & uuml;rkiye. We used the double-digest RADseq method and genotyped 90 populations and 1,589 individuals across the distribution range of the species. Genome-wide SNPs from 28 populations of A. velutinum, 32 populations of F. orientalis, and 30 Q. castaneifolia revealed higher genetic differentiation among A. velutinum populations than among F. orientalis and Q. castaneifolia. The global FST value was lowest for F. orientalis populations and highest for A. velutinum populations, while the global FIS value was negative for A. velutinum. Demographic history analysis revealed a bottleneck during the last glacial period (11,500-115,000 Kya) for the A. velutinum populations with reduced effective population size (Ne). All three species show multiple bottlenecks and reduced Ne during the Quaternary. Pronounced genetic divergence among A. velutinum populations in the Hyrcanian forests compared to the other two species suggests cryptic speciation. Conversely, F. orientalis and Q. castaneifolia populations showed low levels of genetic structure, suggesting that species-specific factors, such as pollen production and pollination efficiency, may have influenced the genetic patterns within these species in similar environments. The nucleotide diversity of F. orientalis populations in Iran is negatively correlated with altitude (p = 0.046). In contrast, A. velutinum populations show a significant correlation between nucleotide diversity and longitude (p = 0.008). Furthermore, the F. orientalis populations from T & uuml;rkiye showed a distinct west-east genetic structure and were highly diverged from the Iranian F. orientalis populations.
Genomic diversity of major tree species in the Eurasian relict forests of northern Iran (vol 20, 35, 2024)
(2024.01.01) Vatanparast, M.; Madsen, P.; Sagheb-Talebi, K.; Larsen, J.B.; Ayan, S.; Hansen, O.K.
The effect of different biological products applied with different doses and exposure time on the germination of Scots pine seeds
(University of Guilan, 2024) Kapar, B.; Kurmangozhinov, A.; Osserkhan, B.; Ayan, S.
The aim of the study was to determine the efficiency of methods enhancing the vitality of Scots pine, Pinus sylvestris L. seed by using biological products of microbial origin such as Agrarka, AgroMIX, and Epin with 10 mL L-1, 5 mL L-1, and 2.5 mL L-1 doses. The exposure time of the seeds were 30 min, 1 h, 6 h, 24 h. The examined parameters included germination energy (GE) and germination capacity (GC). The results showed that all the tested methods accelerate germination of the pine seeds; using biological products is the most efficient and recommended method for Scots pine and soaking of seeds not long-term is the most efficient and recommended. The best results for the GE and GE were obtained in the pine using biological preparation at AgroMix 10 mL L-1 under 6 h of soaking seeds.
The Future Possible Distribution of Kasnak Oak (Quercus vulcanica Boiss. & Heldr. ex Kotschy) in Anatolia under Climate Change Scenarios
(Multidisciplinary Digital Publishing Institute (MDPI), 2024) Özcan, A.U.; Gülçin, D.; Tuttu, G.; Velázquez, J.; Ayan, S.; Stephan, J.; Tuttu, U.; Varlı, A.; Çiçek, K.
The deterioration of natural habitats for oak species has steadily occurred as a consequence of both climate change and human pressure. Therefore, detailed and reliable information about the geographic distribution of oak species under changing climate conditions is needed for diverse ecological and conservation practices. This study examined the habitat suitability of endemic Kasnak oak, Quercus vulcanica Boiss. & Heldr. ex Kotschy, an endemic that ranges across the Central Anatolia Region and surrounding mountains in Türkiye. The occurrence data were gathered through fieldwork, and new records were identified. Next, we applied ecological niche modeling to assess the past, present-day, and future potential geographic range of the species in Anatolia. Projections for the Last Glacial Maximum indicate that most of the suitable areas for Kasnak oak were in southern Anatolia. However, present-day estimates suggest projections estimate suitable habitats in northern Anatolia and around the Anatolian Diagonal. According to future projections, the distribution of the species seems to decrease by 2100, with habitat suitability reduction ranging from 3.27% to 7.88%. Projections suggest a decrease in habitat suitability for the species, particularly in the western and southern Türkiye in the future. Moreover, the projections indicated that suitable habitats for the northern range of the species would likely persist until 2100, although they would diminish towards the northeast. The results can be effectively applied to enhance biodiversity conservation planning and management, leading to the development of innovative strategies.
The oil content and fatty acid composition of Fagus orientalis Lipsky seeds from different populations in Turkiye
(2024) Özel, H.B.; Ayan, S.; Onat, S.M.
Knowledge of the nutrient content of edible seeds of oriental beech (Fagus orientalis Lipsky) as a food resource for rural people, is incomplete and there is a need for studies that will provide this information. The seeds of oriental beech collected from 12 different locations in a primary distribution area of Turkey were investigated for their oil content and fatty acid composition. The fatty acid contents of these 12 different populations were determined by gas chromatography-mass spectrometry (GC/MS) of the fatty acids methyl esters (FAME). The seeds of the various tree populations were found to contain total oil amount ranging from 44.66% to 49.07%, which was primarily composed of oleic, linoleic, palmitic, and gadoleic acids. As the predominant unsaturated fatty acid, there was no difference among the populations in the percentage of oleic acid with the highest percentage of unsaturated fatty acids. As the primary saturated fatty acid, the highest palmitic acid content was determined in the Ordu-Akkus population (13.85%), where the species made the optimal development, while the lowest value was determined in the Kahraman-maras-Andirin population (7.14%), which is an isolated population of the species. In the study of oriental beech populations, palmitic acid was found in the major saturated fatty acids, on the other hand oleic, linoleic, and gadoleic acids were found in major unsaturated fatty acids. This study highlights the potential of oriental beech seeds as a nutrient-rich food source due to their high total fat content.
Türkiye’deki bazı Sapsız meşe (Quercus petraea (Mattuschka) Liebl.) tohum meşcerelerinin genel değerlendirilmesi
(2023) Meşe, Ö.; Öner, M.N.; Ayan, S.
Meşe türlerinden biri olan sapsız meşe, Quercus petraea subsp. petraea, Quercus petraea subsp. iberica ve Quercus petraea subsp. pinnatiloba olmak üzere üç alt tür ile temsil edilmektedir. Bunlardan subsp. petraea, Bolu ve Kırklareli’deki 200 m yükseltilerde; subsp. iberica, İstanbul, Kastamonu, Artvin, Balıkesir, Bursa, Eskişehir, Kırklareli, Kütahya, Sakarya, Sinop, Tokat, Trabzon’daki 0-1600 m yükseltilerde; subsp. pinnatiloba ise Adana, Hakkâri, Bingöl, Elazığ, Hatay, İçel, Malatya, Kahramanmaraş, Muş, Tunceli, Van yörelerindeki 1200-2200 m yükseltilerde doğal yayılış göstermektedir. Türkiye’de sapsız meşe için Orman Genel Müdürülüğü (OGM) adına Orman Ağaçları Tohum Islah Araştırma Enstitüsünce dokuz adet tohum meşceresi tescil edilip Ulusal Kayıt (UK) numarası alınmış ve beşi sonra iptal edilmiştir. Halen tohum meşceresi vasfını taşıyan dördü; Elazığ-Tunceli-Nazımiye (UK no:289), İstanbul-Demirköy-Karacadağ (UK no:294), Bursa-Mustafakemalpaşa-Gürgendağı (UK no:326) ve Bolu-Mengen-Kaynarca (UK no:400)’dır. Bu çalışmada hem tohum meşceresi vasfını taşıyan ıslah tesislerinin özellikleri ve seçim kriterleri (ölçütleri) değerlendirilmiş hem de listeden çıkarılan beş tohum meşceresinin (Elazığ-Bingöl-Ilıca (UK no:290), Sakarya-Akyazı-Keremali (UK no:300), Bolu-Bolu-Ayıkaya (UK no:301), Bolu-Mudurnu-Sarıkaya (UK no:302) ve Zonguldak-Dirgine-Aksu (UK no: 297)) iptal gerekçesi ve özellikleri irdelenmiştir.
Variation of biochemical content in the almonds of the endemic Argan tree (Argania spinosa (L.) Skeels) populations in Morocco
(2024) Ayan, S.; Abdaloglu, G.; Laaribya, S.; Turfan, N.; Çelik, E.N.Y.; Ouhaddou, H.; Alaoui, A.
In this study, it was aimed to determine the variation of the biochemical characteristics of the argan [Argania spinosa (L.) Skeels] in natural distribution areas in Morocco. For this aim, it was used 13 populations, which are representative of the taxon on different sub-ecoregion in Morocco, to determine some biochemical compositions characters such as malondialdehyde (MDA), hydrogen peroxide (H2O2), proline, protein, flavonoid, phenol, glucose, sucrose, fructose, enzyme activities of superoxide dismutase (SOD), and peroxidase (POD) were analyzed. To determine variations among the population were analyzed using ANOVA. In addition, the phylogenetic relationship among the populations was revealed by Cluster Analysis. As a result of the research, significant differences were determined in terms of all parameters such as proline, protein, flavonoid, phenol, glucose, sucrose, fructose, MDA, H2O2, SOD, and POD of almond diversity among the populations. According to the Cluster Analysis, the results showed that the Tamanar population was relatively different from all other populations. The results obtained in the research confirm the high variety of different habitats in the natural distribution areas of argan in Morocco. The revealing of the diversity among the populations in the natural distribution area of this extremely degraded species is of primary importance for the conservation policies and sustainable use of the species.