Çağatay Tavşanoğlu

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• Ph.D.
• Professor at Hacettepe University

Purpose Understanding parasite diversity in wild and captive animal populations is vital for their individual health and ecosystem dynamics. The helminth community in mountain gazelles ( Gazella gazella Pallas, 1766), particularly in the isolated northernmost population in Türkiye, remains poorly understood, posing challenges for conservation. This...

Plant-plant interactions are major determinants of the dynamics of terrestrial ecosystems. There is a long tradition in the study of these interactions, their mechanisms and their consequences using experimental, observational and theoretical approaches. Empirical studies overwhelmingly focus at the level of species pairs or small sets of species....

Background and Aims Fire-released seed dormancy (SD) is a key trait for successful germination and plant persistence in many fire-prone ecosystems. Many local studies have shown that fire-released SD depends on heat and exposure time, dose of smoke-derived compounds, SD class, plant lineage and the fire regime. However, a global quantitative analys...

The grasslands of Central Anatolia in Türkiye, including the steppes and forest-steppes, are often mischaracterized as degraded ecosystems due to long-standing human activities, particularly agriculture and domestic grazing. However, palaeoecological evidence and recent research suggest that these grasslands are ancient, biodiversity-rich systems t...

Grazing is a major ecological driver that influences vegetation dynamics globally. We investigated the long‐term effects of different grazing regimes on the vegetation structure of the Central Anatolian steppes, a region characterized by its unique convergence of biogeographical influences and historical land use. We employed the spatially explicit...

Lightning is the primary natural ignition source for wildfires. However, in certain ecosystems, anthropogenic fires predominate and account for the majority of fire incidents. In many countries, the prevailing perception holds that wildfires are overwhelmingly human-caused. While statistically accurate when pooling data from across the country, thi...

Introduction The aim of our study was to measure fecal glucocorticoid metabolite (FGM) concentrations in captive and free-ranging male and female mountain gazelles (Gazella gazella) during their circannual cycle. In addition, FGM concentrations were used to track the intensity of the adrenocortical response in mountain gazelles during the same peri...

Globe-LFMC 2.0, an updated version of Globe-LFMC, is a comprehensive dataset of over 280,000 Live Fuel Moisture Content (LFMC) measurements. These measurements were gathered through field campaigns conducted in 15 countries spanning 47 years. In contrast to its prior version, Globe-LFMC 2.0 incorporates over 120,000 additional data entries, introdu...

Background Understanding parasite diversity in wild and captive animal populations has critical implications for both individual animal health and ecosystem dynamics in a broader sense. In mountain gazelles (Gazella gazella), the gastrointestinal helminth community is poorly understood, limiting our efforts in the conservation of this endangered bo...

Leaf traits are good indicators of ecosystem functioning and plant adaptations to environmental conditions. We examined whether leaf trait variability at species and community levels in Mediterranean woody vegetation explained by growth form, regeneration mode, and vegetation type. We studied several plant communities across five vegetation types -...

The lack of information on plant traits limits our understanding of how plant species and communities will respond to ongoing global changes. The biodiversity-rich Anatolian steppes have remained unexplored in terms of belowground plant traits. We documented the distribution and representation of belowground organs (excluding roots that do not form...

Background The global human footprint has fundamentally altered wildfire regimes, creating serious consequences for human health, biodiversity, and climate. However, it remains difficult to project how long-term interactions among land use, management, and climate change will affect fire behavior, representing a key knowledge gap for sustainable ma...

There is a growing interest in understanding the mechanisms involved in seed germination stimulated by smoke and smoke-derived compounds. In this study, we aimed to determine the possible role of gibberellins (GAs) and reactive oxygen species (ROS) in the seed germination of three smoke-responsive and fire-adapted species, viz. Onopordum caricum (A...

Scientists are becoming increasingly aware that disparities in opportunities for conducting and publishing research among scientists living under different socio-economic contexts have created pervasive biases and long-lasting impacts on our views of the natural world. These disparities are challenging the establishment of a global research agenda...

Maquis ecosystems are among the most uncertain and controversial vegetation types within Turkish forestry. Our review aims to describe and classify these ecosystems in Mediterranean-climate regions of Türkiye, shedding light on the evolution of their legal status in Turkish forestry since the last century. We emphasize their conservation importance...

Kazdağı göknarı (Abies nordmanniana subsp. equi-trojani) Biga Yarımadası ve Kızılırmak Deltası arasında yayılış gösteren, endemik ve Dünya Doğa Koruma Birliği (IUCN)’ne göre tehlikede (EN) olan asli bir orman ağacıdır. Bu çalışmanın amacı Kazdağı göknarı üzerine yayınlanmış tüm çalışmaları derlemek ve sonucunda tür hakkındaki bilinenleri ve bilinme...

Human activity has fundamentally altered wildfire on Earth, creating serious consequences for human health, global biodiversity, and climate change. However, it remains difficult to predict fire interactions with land use, management, and climate change, representing a serious knowledge gap and vulnerability. We used expert assessment to combine op...

Plant recruitment interactions (i.e., what recruits under what) shape the composition, diversity, and structure of plant communities. Despite the huge body of knowledge on the mechanisms underlying recruitment interactions among species, we still know little about the structure of the recruitment networks emerging in ecological communities. Modelin...

Plant recruitment interactions (i.e., who recruits under whom) between 3,318 vascular plant species across the globe

Rapor, Türkiye'de 2021 yılında gerçekleşen büyük orman yangınlarının ekolojik ve sosyo-ekonomik etkilerinin değerlendirilmesini içermektedir.

The Mediterranean Basin is a biogeography shaped by fires for millions of years. For the restoration of burned areas in the Mediterranean Basin, therefore, planning should increase resistance and resilience of plant communities to fire by considering adaptation strategies of plant species to fire. In this study, following the fire of 2021, affected...

Çağımızın en önemli çevre sorunları arasında yer alan iklim değişikliği, türler, komüniteler ve ekosistemler üzerinde önemli olumsuz etkiler oluşturmaktadır. Dünyada geniş yayılış gösteren ve ekosistemlerin işleyişinde önemli rollere sahip olan yarasalar, iklim değişikliğinden önemli ölçüde etkilenecek canlılar arasındadır. Bu çalışmada, iklim deği...

Akdeniz Havzası, milyonlarca yıldan beri yangınlara maruz kalan ve yangınlar sonucunda şekillenmiş bir biyocoğrafyadır. Bu nedenle Akdeniz Havzası’ndaki yanan alanların restorasyonunda bitki türlerinin yangına uyarlanma stratejilerinin dikkate alınarak, bitki topluluklarının sonraki yangına karşı direnç ve direngenliğinin artırılmasına yönelik plan...

In this study, we aimed to use tree-ring based fire reconstruction to understand the spatiotemporal patterns of past fires in different climate types of western Anatolia. We collected fire scarred wood samples from living trees as wedges and remnant woods from ten sites along a transect that represents a continental to Mediterranean climate gradien...

The Mediterranean Basin has distinct vegetation types shaped by fire, herbivory, and various human activities. Based on data from 83 belt transects of 10 × 40 m in 28 study sites for five physiognomic vegetation types (semi-closed forest, open forest, closed shrubland, open shrubland, and scrubland) in southwestern Anatolia (Turkey), we analyzed wo...

Türkiye, yaklaşık 203,000 hektar alanın yandığı 2021'de orman yangınlarından çok fazla etkilendi (1). Yanan alanların çoğu Akdeniz Pinus brutia (Kızılçam) ormanlarıyla kaplıydı ve şiddetli yangınlar çamların çoğunun ölümüne yol açtı (2). Bununla birlikte, bu ağaç türü, yangının ısısı tohumları serbest bırakana kadar onları içinde tutan belli sayıda...

How plant communities in Anatolian steppes recover after disturbances has remained unknown. To study the effects of small-scale disturbances on plant communities of the central Anatolian steppe, we established thirty-two plots 1 × 1 m in size in a natural steppe near Ankara (Turkey). The plots were subjected to mowing or hoeing treatments represent...

• Available studies are far from giving a complete figure for the germination requirements of many Mediterranean Basin species. • In this study, we investigated the germination properties of Lavandula stoechas L. (Lamiaceae) in response to different light and temperature regimes. We performed comprehensive experiments to test the effect of fixed an...

Orman yangınlarının sebepleri ve sonrasında yapılması gerekenler konusunda Hacettepe Üniversitesi için hazırlanmış olan teknik rapor

Forests in the Mediterranean basin frequently experience fires due to both anthropogenic and natural causes. There are concerns that the fire season will prolong in the Mediterranean basin, the fire frequency will increase with ongoing climate change, moreover, the fire regimes will shift from surface fires to local crown fires. Here, we aim to imp...

Reseda is an understudied genus regarding germination ecology. We studied the germination response of eight perennial Reseda species to fire related cues by performing a germination experiment including two aqueous smoke treatments (at 1:5 and 1:20 concentrations), one heat shock (100°C for 5 min.) treatment, and two corresponding controls. Smoke s...

The brown bear (Ursus arctos L.) is an omnivorous large mammal that has an essential function in many ecosystems as a seed disperser. We studied the brown bear's role as a seed dispersal agent in a mixed temperate forest in northern Anatolia, Turkey. We collected 197 fecal samples from the field during the brown bear's active period for two consecu...

The cover image is based on the Original Article Changes in functional composition and diversity of waterbirds: The roles of water level and submerged macrophytes, by İbrahim Kaan Özgencil https://doi.org/10.1111/fwb.13531.

Maquis vegetation is a Mediterranean shrubland type thatexpands across the south and west of Turkey, and composes its own habitat type as well as grows in Turkish red pine (Pinus brutia) forests as understory. Maquis habitat occupies about 6 million hectares, nearly 30 % of the Turkey’s woodlands. Since the forestry law in Turkey does not consider...

• Water level and submerged macrophytes are critical players for the functioning of shallow lake ecosystems; understanding how waterbird communities respond to changes in both can have important implications for conservation and management. Here, we evaluated the effects of changes in water level and submerged macrophyte status on wintering waterbi...

In recent decades, changes in fire activity have been observed in Europe. Fires can have large consequences for the provisioning of ecosystem services and for human well-being. Therefore, understanding the drivers of fire occurrence and improving the predictive capability of fire occurrence models is of utmost importance. So far, most studies have...

Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...

During the last decades, climate and land use changes led to an increased prevalence of megafires in Mediterranean-type climate regions (MCRs). Here, we argue that current wildfire management policies in MCRs are destined to fail. Focused on fire suppression, these policies largely ignore ongoing climate warming and landscape-scale buildup of fuels...

Large mammals play significant roles in shaping the trophic structure of terrestrial ecosystems and affect the form of vegetation growth in many habitats. We studied large mammal community in a Mediterranean habitat mosaic generated by fires originally dominated by pine forests. We conducted camera-trapping surveys in three study sites with differe...

Capsule: This study documents evidence of interglacial refugia during the Last Interglacial for birds in the Mediterranean region, and emphasizes the importance of the Last Interglacial on the geographic distribution and genetic structure of Mediterranean species. Aims: We focused on the historical biogeography of the subalpine warbler complex: Su...

Heat shock-stimulated germination is frequently considered a trait restricted to a few plant families with impermeable seed coats in the Mediterranean Basin. We aimed to ascertain this general idea by using 68 eastern Mediterranean plant taxa differing in growth form, dormancy type, and geographic distributional range. We conducted a laboratory exp...

Explaining predator-prey relationship is crucial for implementing effective conservation practices on large mammals. The Eurasian lynx (Lynx lynx) preys on small ungulates such as roe deer (Capreolus capreolus) in Europe, and on hares (Lepus spp.) in more eastern longitudes, but there is lack of information on the southernmost populations of the Eu...

Fire-affected soils have recently received more attention in soil science because some of the atmospheric CO2 emissions have directly been driven from soils during fires and climate change has increased fire frequency in many ecosystems of Earth. However, low-intensity surface fires and their effects on soil properties have been relatively less stu...

Although reforestation is frequently utilized in many Mediterranean Basin countries to restore burned Mediterranean pine woodlands, post-fire recovery of the plant community is often neglected. To compare the post-fire recovery of the plant community following active and indirect post-fire restoration techniques, we studied three post-fire regenera...

Functional trait databases are emerging as crucial tools for a wide range of ecological studies across the world. Here, we provide a database of functional traits for vascular plant species of the Mediterranean Basin. The database includes 25,764 individual records of 44 traits from 2,457 plant taxa distributed in 119 taxonomic families. This datab...

The promoting effect of smoke-derived chemicals (e.g. karrikinolide and cyanohydrin) on germination in many plants from Mediterranean-type ecosystems such as South Africa and south-western Australia is well documented. However, very little is known about 1) the relative importance of different compounds and their possible interactive effects, 2) th...

Chaenorhinum gerense is an eastern Mediterranean species with rare distribution and a large variety in plant and seed morphology. In this study, the accuracy of the taxonomic status of this species, which was initially reported by P.H. Davis as C. rubrifolium from south eastern Turkey, is discussed and the typical representatives of C. rubrifolium...

During the Pleistocene glacial periods, the ranges of many temperate species in Europe contracted southwards to ref-ugia near the Mediterranean Basin. This study tested the 'expansion-contraction' model by applying the ecological niche modelling approach to one widespread temperate tree species, pedunculate oak, Quercus robur L., distributed across...

During the Pleistocene glacial periods, the ranges of many temperate species in Europe contracted southwards to refugia near the Mediterranean Basin. This study tested the 'expansion-contraction' model by applying the ecological niche modelling approach to one widespread temperate tree species, pedunculate oak, Quercus robur L., distributed across...

Wildland and cropland fires, which differ considerably in fire regime characteristics, have often been evaluated jointly to estimate regional or global fire regimes using satellite-based fire activity data. We hypothesised that excluding cropland fires will change the output of the models regarding the drivers of natural fire activity. We modelled...

In this manuscript, the ecological role of wildfire is addressed, and the studies in pyrogeography, a recently emerged science branch, are summarized. Paradigm shifts in our understanding of the role of fire in natural ecosystems are mentioned, and the outcomes of these shifts in forestry applications and in ecological sciences are explained from a...

Despite its biological richness, Anatolian steppe ecosystem is currently under threat because of human activity. Anatolian steppe vegetation had been shaped by natural disturbances such as fire and grazing in the past but has been subjected to anthropogenic disturbances such as agriculture and domestic grazing due to increased human activity since...

In Mediterranean fire-prone ecosystems, annual species specific to post-fire habitats should have a soil seed bank and should be able to germinate after a fire. Therefore, various fire-related cues can be expected to stimulate germination in post-fire annuals. Germination patterns of the rare annual Chaenorhinum rubrifolium (Plantaginaceae) were ex...

Many plant traits show variability within species in response to ecological gradients. In this study, we examined the variability in seed traits among ten populations of Helianthemum salicifolium (L.) Miller in An-atolia, Turkey. Since the Anatolian Peninsula has a geographic structure exhibiting longitudinal, elevational and climatic gradients, we...

The Turkish government has announced its draft primary and secondary school curricula, which now contain no mention of evolution. Turkey's Ecology and Evolutionary Biology Society (see go.nature.com/2kgajpu) urges stakeholders, the Turkish public and the international scientific community to support reinstatement of evolution in the curriculum (com...

Determining the relative role of various cues on seed germination in Mediterranean plants is important to understanding their response to variable conditions. We studied germination responses of 12 eastern Mediterranean Basin species (Alyssum caricum, A. minus, Carthamus dentatus, Daucus broteri, D. carota, Hypericum aviculariifolium, Muscari comos...

Soil properties after low-intensity surface fires have relatively less studied in comparison to moderate to high-intensity crown fires. A mixed forest stand dominated by Castanea sativa (sweet chestnut), Fagus orientalis (oriental beech) and Pinus nigra ssp. pallasiana (Anatolian black pine), which had been burnt by a surface fire in December 2011...

The role of smoke in fire-stimulated germination in the Mediterranean Basin has often been underestimated. A few records on smoke-enhanced germination are present in Mediterranean Lamiaceae species, but there is still a shortage of information to allow generalizations about this family to be made. To test the hypothesis that smoke enhances germinat...

Giriş: Cistaceae familyasında tohumların en önemli karakteristiklerinden birisi sert ve su geçirmez bir tohum kabuğunun varlığı ve bu nedenle görülen yüksek seviyedeki fiziksel tohum dormansisidir. Bu familyaya bağlı Cistus, Fumana ve Tuberaria cinslerine ait türlerde, yangın sırasında ortaya çıkan sıcaklıkların tohum çimlenmesini uyardığı bilinmek...

Regeneration mode is one of the key attributes determining population structure and dynamics of plant species. We investigated long-term patterns after fire in the cover of plant species in a 100-year chronosequence of burned Pinus brutia forests in a humid Mediterranean climate region in Turkey. Significant trends were present in the change of cov...

In fire-prone environments, studying the variability of regeneration traits is important to show the potential of plant species to survive under consecutive post-fire and fire-free conditions. We studied the relationship between seed size and germination patterns in Cistus salviifolius (Cistaceae), which is a fire-follower species distributed throu...

The role of smoke as a fire-related germination cue is well known in many parts of the world, including Mediterranean-type ecosystems; however, it has been neglected in the Mediterranean Basin (MB). We studied the germination response of 5 woody species found in the eastern MB (south-western Turkey) to smoke solutions derived from different plant s...

Amaç: Helianthemum salicifolium türünün morfolojisi, sitolojisi, mikromorfolojisi, palinolojisi ve çimlenme ekolojisinin ortaya konması. Gereç ve Yöntemler: 2010-2011 yıllarında Türkiye genelinde yapılan arazi çalışmalarında H. salicifolium populasyonlarına ait bireyler çiçekli ve meyveli dönemlerde toplanmış, populasyonlara ait lokalite bilgileri...

Intraspecific trait variability has a fundamental contribution to the overall trait variability. However, little is known concerning the relative role of local (e.g. disturbances and species interaction) and regional (biogeographical) processes in generating this intraspecific trait variability. While biogeographical processes enhance plant trait v...

Turkey (Turkiye) lies at the nexus of Europe, the Middle East, Central Asia and Africa. Turkey's location, mountains, and its encirclement by three seas have resulted in high terrestrial, fresh water, and marine biodiversity. Most of Turkey's land area is covered by one of three biodiversity hotspots (Caucasus, Irano-Anatolian, and Mediterranean)....

This study investigated the relationship between fire-related cues (heat shock and smoke) and the germination behaviour of Cistus creticus (Cistaceae) seeds under laboratory conditions. The seeds were obtained from a long-unburned Pinus brutia Ten. forest located on the Bozburun peninsula, Muǧla, Turkey. Heat treatments were carried out at 80, 100,...

strong>Riassunto Presenza di grandi e medi mammiferi in pinete incendiate della Turchia sud-occidentale Nel periodo Novembre 2005-Agosto 2006, è stata verificata, tramite trappole fotografiche, la presenza di mammiferi di grandi e medie dimensioni in foreste di Pinus brutia integre e incendiate della Turchia sud-occidentale. Sono state ottenute f...

The dynamics of seed production and fruit parasitism in a fire-following obligate seeder species, Cistus salviifolius L. were investigated along a post-fire successional gradient in Marmaris, southwestern Turkey. Four sites of different post-fire age (1, 5, 21 and 45 years) were studied for three consecutive years. Fruit samples were collected and...

During the last quarter of the 20th century, demographic and land use changes caused alterations to the over-centuries established fire regime across the ‘mediterranean climate’ areas of the northern part of the Mediterranean Basin. This new fire regime was characterized by increase of the average number of fires and area burned per year and by a d...

Günümüzde gerçekleşen orman yangınlarının büyük bir bölümünün insan kaynaklı nedenlere dayanıyor olmasına karşın, Akdeniz tipi ekosistemler için yangınlar, tarihsel gelişim ve ekolojik bakış açısı ile ele alındığında, ekosistem döngüsünün doğal bir bileşenidir. Yüzbinlerce yıllık gelişim süreci içinde bu ekosistemler, yangınlara karşı uyum yetenekl...

Orman yangını, doğal ekosistemler üzerinde etkili olan çevresel bir müdahale etmeni. 20. yüzyılın başlarında, ekosistemler üzerinde yıkıcı bir etki yarattığı düşü-nülen yangınları tamamen önlemeye yönelik bir yaklaşım hakimdi. Bu yaklaşımın ana amaçlarından biri, yangınların doğadaki biyoçeşitliliği tahrip etmesini önlemekti. Uzun yıllar süren yang...

Plant trait information is essential for understanding plant evolution, vegetation dynamics, and vegetation responses to disturbance and management. Furthermore, in Mediterranean ecosystems, changes in fire regime may be more relevant than direct changes in climatic conditions, making the knowledge of fire‐related traits especially important. Thus...

Post-fire recovery of a Pinus brutia Ten. forest on ophiolithic rocks was studied in Marmaris National Park, southwestern Turkey. Three study sites burned in different years (1999, 1995 and 1979) and a study site not burned for at least 45 years were studied from September 2000-2001. Although some opportunistic species had established in one-year-o...

In the present study, the effect of goat browsing on the growth form of seven maquis species (Olea europea, Phillyrea latifolia, Pistacia terebinthus, Myrtus communis, Quercus coccifera, Juniperus oxycedrus and Arbutus andrachne) in the understorey of Cupressus sempervirens forest of Köprülü Kanyon National Park was examined. Seven goat folds were...

Akdeniz Havzası, sık yangınlara maruz kalan ekosistemleri ve yangına uyum sağlamış bitki türleri ile yangının ekosistemin bütünleyici bir bileşeni olarak değerlendirilebildiği bir bölgedir. Akdeniz Havzası ormanlarında yangın sonrası kendiliğinden gençleşmenin çoğu durumda hızlı bir şekilde gerçekleştiği bilinmektedir. Ancak, özellikle son yıllarda...

The aim of the study was to examine the effect of aspect on post-fire recovery of a mixed Lebanon cedar ( Cedrus libani A. Rich.) -Anatolian black pine ( Pinus nigra Arnold subsp. pallasiana [Lamb.] Holmboe) forest in Köprülü Kanyon National Park, southern Turkey. Study plots were randomly selected according to three main aspects within the burned...

: The population dynamics of 2 species of Cistus L. (C. salviifolius L. and C. creticus L.) were studied along a post-fire successional gradient in Pinus brutia Ten. forests in Marmaris National Park, Turkey. The population density of Cistus spp. was 16 individual m-2 at the end of the first year after fire and then decreased exponentially (r2 = 0....