Hakan Gür- PhD
- Professor (Full) at Ahi Evran University
Hakan Gür
- PhD
- Professor (Full) at Ahi Evran University
Professor, Ahi Evran Univ. /// Postdoc Association, Univ. of Lethbridge, Canada /// Research Assistant, Hacettepe Univ.
About
49
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Introduction
I am an Associate Professor at Kırşehir Ahi Evran University. I study the evolutionary, behavioral, and physiological ecology of ground squirrels (the genus Spermophilus). My work also focuses on the effects of global climate changes on birds and mammals.
Current institution
Additional affiliations
February 2014 - present
December 2008 - February 2014
October 1998 - September 2007
Publications
Publications (49)
Bu metin, (1) çok kısaca iklim değişikliğine değiniyor, (2) tür dağılım modellemesi ile ilgili kavramsal çerçeveyi tartışıyor ve (3) tür dağılım modellemesi analizlerinin Wallace platformu üzerinden nasıl gerçekleştirileceğini tarif ediyor. En önemlisi, ilk olarak tür dağılım modellemesi alanına yeni girmek isteyen kişilere bir başlangıç sunmayı am...
Climate and land-use changes are among the most important drivers of biodiversity loss and, moreover, their impacts on biodiversity are expected to increase further in the 21st century. In this study, the future impact of climate and land-use changes on Anatolian ground squirrels (Spermophilus xanthoprymnus) was assessed. Accordingly, a hierarchica...
Climate is well known as the main driver of species distributions. In this study, I focused on Geyik Mountains and surrounding areas to illustrate how complex topography and climatic conditions have shaped the distribution patterns of species/communities and therefore the biodiversity of the Mediterranean Taurus Mountains, one of the most biologica...
Climate and land-use changes are among the most important drivers of biodiversity loss and, moreover, their impacts on biodiversity are expected to increase further in the 21st century. In this study, the future impact of climate and land-use changes on Anatolian ground squirrels was assessed. Accordingly, a hierarchical approach with two steps was...
The responses of Anatolian plants to global climate change have been poorly investigated. In this study, we aimed to understand how climatic oscillation during the Quaternary period helped to shape the current distribution patterns of the Anatolian endemic Noccaea iberidea, a typical representative of tragacanthic (thorny cushion) steppe communitie...
The responses of Anatolian plants to global climate change have been poorly investigated. In this study, we aimed
to understand how climatic oscillation during the Quaternary period helped to shape the current distribution
patterns of the Anatolian endemic Noccaea iberidea, a typical representative of tragacanthic (thorny cushion) steppe
communitie...
Dünya üzerinde 1940-2004 yılları arasında 335 yeni bulaşıcı hastalık ortaya çıkmıştır. ‘Yeni ortaya çıkan bulaşıcı hastalık’ sayısı ve dolayısıyla küresel sağlık için tehdit, son yıllarda artmıştır. Bu hastalıkların çoğunluğuna hayvan kaynaklı patojenler (virüs, bakteri vb.), bunların da büyük çoğunluğuna yaban hayatı kaynaklı patojenler neden olur...
Ecological niche modelling has been widely used in recent biogeographic studies. Naturally, it is the key component of disease biogeography, the study of the geographic distribution of infectious diseases. Disease biogeography is a new paradigm in epidemiology, and uses not just spatial patterns (the spatial distribution of disease cases), but also...
Yer sincaplarının çoğu ve onların yakın akrabaları her yıl zorunlu olarak hibernasyona girer. Bu küçük memelilerin yıllık yaşam döngüsü, aktif sezon ve kış uykusu olarak bilinen hibernasyon olmak üzere iki ana bölümde incelenebilir.
Anadolu yer sincapları, coğrafi ve çevresel/iklimsel farklılıklara cevap olarak, Anadolu Diyagonali’nin batısı (İç Anadolu) ile doğusu (özellikle Kuzeydoğu Anadolu, Erzurum-Kars Platosu) arasında hibernasyon örüntüsünü ve vücut büyüklüğünü de içeren birçok uyumsal varyasyon evrimleştirmiştir.
Anadolu, biyocoğrafi olarak ilginç, ancak yeterince incelenmemiş bir bölgedir. Anadolu’nun biyolojik çeşitliliğini şekillendiren en belirgin biyocoğrafi özelliklerden biri, Anadolu Diyagonali’dir. Anadolu Diyagonali, önemli bir biyocoğrafi süreksizliğe karşılık gelir. Bu süreksizlik, özellikle sıcaklık mevsimselliği ile ilişkili çevresel süreksizli...
Büyük kıtasal buz tabakaları, Kuzey Yarımküre’de Kuvaterner boyunca birçok kez ilerlemiş ve geri çekilmiştir. Büyük kıtasal buz tabakalarının olduğu dönemler buzul dönemler, diğer dönemler ise buzullararası dönemler olarak bilinmektedir. Buzul buzullararası döngülere eşlik eden iklim değişiklikleri, ya türlerin yer değiştirmesine, değişen çevresel...
Understanding how species have responded to strong climatic fluctuations accompanying glacial-interglacial cycles is critical to predicting their likely responses to future climate change, and therefore can help guide conservation strategies. Using molecular phylogeography and ecological niche modelling, we aimed to understand how a newly recognize...
70th GEOLOGICAL CONGRESS OF TURKEY CULTURAL GEOLOGY AND GEOLOGICAL HERITAGE 10-14 April 2017 | Ankara Turkey
Bu yazıda, Anadolu Diyagonali ile ilişkili coğrafi ve çevresel/iklimsel farklılıklar ile ilgili olarak, Anadolu yer sincaplarının (Spermophilus xanthoprymnus) hibernasyon örüntüsü ve vücut büyüklüğü açısından sergilediği uyumsal varyasyonlar açıklanmıştır.
Anahtar sözcükler: Anadolu yer sincabı, hibernasyon, Spermophilus xanthoprymnus, vücut büyük...
Türkiye’nin Asya bölümü (Anadolu), dünyadaki 36 biyolojik çeşitlilik sıcak noktasından üçünün karşılaştığı ve etkileştiği bir bölgedir: Akdeniz Havzası, İran-Anadolu ve Kafkasya biyolojik çeşitlilik sıcak noktaları. Anadolu’nun biyolojik çeşitliliğini anlamak açısından en belirgin biyocoğrafi özelliklerden biri, uzun zamandır iç ve doğu Anadolu ara...
Biyolojik bilimlerin penceresinden bakacak olursak, iklim değişikliği, organizmadan biyoma kadar biyolojik çeşitliliğin tüm bileşenlerini etkiler ve biyolojik çeşitlilik için önemli bir tehdittir. Yakın geçmişteki iklim değişikliği fiziksel ve biyolojik sistemleri ve insanoğlunu etkiledi, türlerin dağılımlarını, aktivitelerini, göçlerini, bolluklar...
http://bilimvegelecek.com.tr/tag/hakan-gur/
İklim değişikliği ve bir step hayvanı olan Anadolu yer sincabı – 2 / İklim değişikliği Anadolu yer sincabını nasıl etkiliyor?
http://bilimvegelecek.com.tr/tag/hakan-gur/
The Asian part of Turkey, i.e. Anatolia, is the region where three of the world’s 35 biodiversity hotspots meet, and interact: the Caucasus, Irano-Anatolian, and Mediterranean basin hotspots. One of the most distinctive biogeographic features that helps in understanding the biodiversity of Anatolia is the Anatolian diagonal, which has long been rec...
The late Quaternary climatic oscillations have always been an important actor for
genetic differentiation within species. These differentiation patterns can be
informative to understand species’ historical demographic structure. There are a
number of studies showing that many species distributed in the temperate zone
have experienced range expansio...
In this study, we re-evaluated historical demography of the Eurasian green woodpecker (Picus viridis) on the basis of previously published multi-locus mitochondrial DNA (mtDNA) data and ecological niche modelling. We particularly aimed to test glacial refugia hypothesis during climatic oscillations of the late Quaternary for the Eurasian green wood...
Present-day distribution patterns of many species have been affected by rapid climatic oscillations. The
climatic conditions of Late Quaternary have caused range expansion and restrictions for many species. To
understand how species have responded to these conditions is important in terms of their biogeographical
history. There have been three well...
Hibernation is a seasonal adaptation of small mammals to survive during times of cold exposure, drought, and/or food shortages. Despite many studies on hibernation, few have examined the time structure of body temperature (Tb) before hibernation, particularly under natural conditions. Herein, using advanced analytical methods, we aimed to understan...
Anatolian ground squirrels, Spermophilus xanthoprymnus (Bennett, 1835), are nearly endemic to Turkey. Various aspects of the biology of Anatolian ground squirrels have been studied. However, a detailed description of hibernation, with special attention to age and sex differences, has not previously been reported. Thus, in this study, we aimed to pr...
A special issue on phylogeography and ecological niche modelling, edited by Utku PERKTAŞ from Hacettepe University, TURKEY and Hakan GÜR from Ahi Evran University, TURKEY, was published by Folia Zoologica, International Journal of Vertebrate Zoology (Publisher: Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic). This specia...
Capsule This study is the first ever documented evidence of an interglacial refugium during the Last Interglacial for birds in Anatolia and suggests the need of a re-examination of the effects of the Last Interglacial on the geographic distribution and genetic structure of species.
Aims We tested whether, in accordance with the ‘refugia within refu...
Ecological and Historical Biogeography of Yellow-necked Field Mice living in and around Anatolia Using Ecological Niche Modelling and Molecular Phylogeography
The present study aimed to understand how Anatolian ground squirrels, Spermophilus xanthoprymnus (Bennett, 1835), have responded to global climate changes through the Late Quaternary glacial–interglacial cycles. Accordingly, ecological niche modelling was used, together with molecular phylogeography. Using species occurrence data compiled from fiel...
Woolly dormice, Dryomys laniger Felten and
Storch (Senckenbergiana Biol 49(6):429–435, 1968), are a
small (20–30 g), omnivorous (mainly insectivorous), nocturnal
glirid species endemic to Turkey. Although woolly
dormice have been assumed to hibernate during winter, no
information exists on body temperature patterns and use of
torpor in the species....
Over a 3-year period (1999-2001), we monitored the annual timing of reproduction and hibernation and accompanying changes in body mass of free-living Anatolian ground squirrels (Spermophilus xanthoprymnus) in steppe habitat about 50 km south of Ankara, Turkey. Adult males emerged from hibernation during March, before breeding females. Yearling male...
PERKTAŞ U., QUINTERO E., GÜR H. 2013. Once upon a time in Anatolia: Population history of Anatolian nuthatch. In Conference program and abstracts. International Biogeography Society 6th Biennial Meeting – 9-13 January 2013, Miami, Florida, USA (ed. by J. Hortal, K. Faller, K. Feeley, R. Field, C. Graham, F. Guilhaumon and D. Gavin), frontiers of bi...
Predictable empirical patterns of variation in body size along spatial and environmental gradients have been documented within many species of mammals. Four main hypotheses, heat conservation, heat dissipation, primary productivity and seasonality, have been proposed to explain these patterns of variation in body size. In this study, we reported an...
A phylogenetic comparative analysis of geographic variation in body size of an obligately hibernating marmotine species (Anatolian ground squirrels, Spermophilus xanthoprymnus) is presented in relation to environmental variables that pertain to four principal hypotheses (heat conservation, heat dissipation, primary productivity, and seasonality hyp...
Spermophilus xanthoprymnus (Bennett, 1835), the Asia Minor ground squirrel, is a group-living, diurnal, obligately hibernating marmotine squirrel. It inhabits the steppes and alpine meadows throughout central lowland and eastern highland Anatolia and adjacent Armenia and northwestern Iran. Its preferred elevation appears to range from about 800 to...
"Published in the special issue of the Hacettepe Journal of Biology and Chemistry, which is dedicated to Charles Darwin who changed te direction of modern thought by establishing the basis of evolutionary biology. To see this issue, please visit the following website: http://www.hjbc.hacettepe.edu.tr/issue/38/3
Note from Guest Editor, Dr. Ergi Den...
We studied daily rhythmicity of body temperature (T
b) before and during hibernation in Anatolian ground squirrels (Spermophilus xanthoprymnus) under natural and laboratory conditions using surgically implanted temperature loggers. Under both conditions, robust daily T
b rhythmicity with parameters comparable to those of other ground squirrel speci...
Hypotheses (ecogeographic rules) that have been proposed to explain the patterns of geographic variation in body size in relation to ecogeographic variables were examined using skull characters of adult 78 male and 95 female Anatolian ground squirrels (Spermophilus xanthoprymnus) from 10 geographic localities. Body size was estimated from a princip...
We studied the sex ratio of a population of Anatolian ground squirrels,Spermophilus xanthoprymnus (Bennett, 1835), living in a steppe area about 50 km south of Ankara, Central Anatolia, Turkey in 1999–2001. The sex ratio
among juveniles and yearlings did not differ from 1∶1, but the sex ratio among adults (≥ 2 years old) was biased toward females....
KART M., GÜR H. 2000. On emergence from hibernation and reproduction in Asia Minor ground squirrels. Life in the Cold, 11th International Hibernation Symposium. Jungholz, AUSTRIA. 13-18 August.
Questions
Question (1)
I have been studying on Anatolian ground squirrel for about 20 years. For a while, I have also been interested in the ENM aprroach. Across its geographic distribution, I have been collecting tissue samples every about 20-40 km, and, in the meantime, occurrence records. So, I need a standard method to quantify number of populations (of occupied patches) to associate that measure with suitability obtained by ENM approach. It is difficult for me to quantify population density in a patch because I do field studies across the range. But, I have an observation that frequency of observation (encountering with an individual) tends to be high in areas of high suitability while travelling and collecting tissue samples across a region. That is, the methodology should be compatible with that I am travelling and collecting tissue samples and occurrence records across 100-200 km every day. Note that frequency of observation is also associated with time of day and season!
