Gregor Kozlowski

Gregor Kozlowski
Université de Fribourg · Botanic Garden - Department of Biology

Prof. Dr.
Director, Botanical Garden of the University of Fribourg

About

267
Publications
47,388
Reads
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1,197
Citations
Introduction
Main research interests: conservation biology and biogeography, with special focus on relict, threatened and endemic species.
Additional affiliations
January 1998 - June 2020
Université de Fribourg
Position
  • Group Leader
May 1997 - August 2004
Université de Neuchâtel
Position
  • Research Assistant

Publications

Publications (267)
Article
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Trees are fundamental for Earth's biodiversity as primary producers and ecosystem engineers and are responsible for many of nature's contributions to people. Yet, many tree species at present are threatened with extinction by human activities. Accurate identification of threatened tree species is necessary to quantify the current biodiversity crisi...
Article
Full-text available
Zelkova abelicea is an endemic tree species growing in several localities in the mountainous regions of Crete, Greece. To date, the microarthropod species associated with this tree species have not been identified. Since Z. abelicea populations are isolated and fragmented, it was hypothesized that the characteristics of microarthropod assemblages,...
Article
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The growth of Zelkova abelicea (Lam.) Boiss. (Ulmaceae), a tree species endemic to the island of Crete (Greece), was studied within 31 fenced plots protected from browsing during three years after fencing across the entire distribution range of the species. Potential geographic, edaphic, climatic and physiognomic factors that could influence shoot...
Article
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Die Bestimmung der drei europäischen Ulmen-Arten (Gattung Ulmus) bietet oft Schwierigkeiten, besonders wenn keine Blüten oder Früchte vorhanden sind. In diesem Artikel werden alle Merkmale in Wort und Bild vorgestellt, die für eine Bestimmung im Feld von Nutzen sein könnten.
Article
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La détermination des trois espèces d'ormes d'Europe (genre Ulmus) n'est pas toujours aisée et pose souvent des difficultés aux praticiens, notamment quand les fleurs et fruits sont absents. Tous les critères pouvant être utiles sont présentés de manière condensée et illustrée dans cet article afin d'aider à leur identification sur le terrain.
Article
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Unsuitable livestock farming is considered as a main driver of biodiversity loss. In the high elevation areas across the world, many subalpine and alpine natural herbaceous communities are highly sensitive to sheep overgrazing. Such habitats of high biogeographic and conservation value are refugia for slow-growing, locally rare, and cold-adapted sp...
Article
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A saproxylic beetles inventory in the canton of Fribourg have revealed 86 emblematic species and 132 first cantonal records. − Between 2018 and 2020, 49 flight interception traps were set from March to September in the forests of the Prealps of the canton of Fribourg, with the aim to increase knowledges about saproxylic beetles in this area. These...
Article
The Caspian locust (Gleditsia caspica) is an endemic relict tree that occurs in Hyrcanian forests. Many of its habitats have been destroyed in the last half-century. This study was performed to map past geographic distributions and estimate the suitable areas and potential risks of remaining populations under future climate change. Eight bioclimati...
Article
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Trees have a crucial importance in the functioning of ecosystems on Earth. They are among the largest and longest-living taxa and provide habitat and shelter to numerous species belonging to diverse groups of organisms. Relict trees are of particular interest through their history of survival and adaptation, and because they potentially shelter rar...
Article
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Quercus litseoides, an endangered montane cloud forest species, is endemic to southern China. To understand the genomic features, phylogenetic relationships, and molecular evolution of Q. litseoides, the complete chloroplast (cp) genome was analyzed and compared in Quercus section Cyclobalanopsis. The cp genome of Q. litseoides was 160,782 bp in le...
Article
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Between the nineteenth and early twentieth centuries, large-scale afforestation projects were undertaken in the Swiss Prealps. The Swiss stone pine (Pinus cembra L.), an emblematic alpine tree with important economic potential, conservation value and ecological relevance, was one of the species used in these afforestation efforts. We investigated t...
Article
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Quercus ningangensis is an economically and ecologically important tree species belonging to the family Fagaceae. In this study, the complete chloroplast (cp) genome of Q. ningangensis was sequenced and assembled, and 18 published cp genomes of Quercus were retrieved for genomic analyses (including sequence divergence, repeat elements, and structur...
Article
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Pterocarya fraxinifolia, native to the southern Caucasus and adjacent areas, has been widely introduced in Europe. In this study, we investigate the following: (1) How did its current distribution form? (2) What are the past, current, and future suitable habitats of P. fraxinifolia? (3) What is the best conservation approach? Ecological niche model...
Book
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Trees and other woody plants, such as shrubs and lianas, form the principal components in forests and many other ecosystems on our planet. Being among the largest and longest-living organisms, they support an immense share of the Earth’s terrestrial biodiversity, providing food and habitats for innumerable microorganisms, epiphytes, invertebrate, a...
Article
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Vietnam is one of the main centers of generic diversity for Juglandaceae worldwide. In this study, we present for the first time a province-wide distribution of all 3 subfamilies, 7 genera, and 11 Vietnamese species, and give an update on the habitats of all Vietnamese Juglandaceae species, their uses, and current threats. Juglandaceae are found th...
Article
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Sorbus aucuparia (Rosaceae) is a small tree species widely distributed in Eurasia. The Hyrcanian forest is the southernmost distribution limit of this species. Severe habitat degradation and inadequate human interventions have endangered the long-term survival of this species in this region, and it is necessary to develop and apply appropriate mana...
Book
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Fit for the Future. In the last two years, the Department of Biology continued its path of consolidation, removing the last administrative remains of the former “units”. We now have a uniform hierarchy, established minimally structured working groups that deal with diverse organizational tasks, and streamlined administration that gives us more fle...
Chapter
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Our research group explores various aspects of biology, evolution and biogeography of threatened, endemic and relict plant species. Through our studies, we aim to provide the basic knowledge in order to efficiently protect species at the brink of extinction. The trademark of our group is an intensive field-work, both locally (e.g., Switzerland, Alp...
Book
Full-text available
Trees are a major component of forests and many other ecosystems on our planet. As some of the largest and oldest organisms, they are the backbone of biodiversity, providing food and habitats for microorganisms, epiphytes and countless animal species. Trees have also accompanied humans throughout their evolution. Even today, billions of people use...
Book
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Drzewa są głównym składnikiem wielu ekosystemów na naszej planecie. Jako jedne z największych i najstarszych organizmów, stanowią filar różnorodności biologicznej, kreując warunki do życia dla wielu gatunków epifitycznych czy wręcz niezliczonej liczby zwierząt. Drzewa towarzyszyły również i ludziom w ciągu całej ewolucji. Do dziś przez wielu wykorz...
Article
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The elm family (Ulmaceae) is a woody plant group with important scientific, societal, and economic value. We aim to present the first biogeographic synthesis investigating the global diversity, distribution, ecological preferences, and the conservation status of Ulmaceae. A literature review was performed to explore the available data for all extan...
Article
The relict tree species Zelkova abelicea and Z. sicula (Ulmaceae) occur in Crete and Sicily, respectively. Zelkova abelicea grows in approximately 40 localities in the mountains of Crete, while Z. sicula has been found in only two stands in Sicily. We compared 25 morphological characters of the leaves of both species and used statistical methods (T...
Chapter
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Zelkova sicula Di Pasquale, Garfì & Quézel is a narrow endemic tree listed in the Italian Red List of vascular plants and reported as ‘CR’ (Critically Endangered) according to IUCN criteria (Garfì et al., 2017a). This species counts only two extant sub-populations located between 350 and 500 m a.s.l.. They colonize the bottom of little stream catch...
Article
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Caprine overbrowsing is a main threat to trees of pastoral mountain woodlands in the Mediterranean region of Europe. In this study, we assess the impact of browsing exclusion on the growth and regeneration of the endangered Zelkova abelicea, a Paleogene relict tree endemic to Crete (Greece). Shoot elongation, height growth and natural regeneration...
Book
Das Handbuch zur Pflanzenbestimmung: rund 2000 Begriffe werden erklärt und illustriert. Umfangreich illustriert mit über 1000 detailgenauen Zeichnungen. Von einem Autoren-Team aus Botanikexperten, praxiserprobten Exkursionsleitern und wissenschaftlichen Illustratoren.
Article
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Control of seed germination and dormancy is important in seed plant adaptation and evolution. When studying seed dormancy of Quercus species, we observed a substantially delayed shoot emergence following a fast root emergence in Quercus chungii F.P.Metcalf. Since epicotyl physiological dormancy (PD) has not been reported in Quercus section Cyclobal...
Article
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With only two tiny populations, the climate relict Zelkova sicula (Sicily, Italy) is one of the rarest trees in the world. It also represents the most marginal member of genus Zelkova that was widespread in the broadleaved forests thriving in warm–temperate climates throughout Eurasia until the Last Glacial Age. Occurring at the westernmost range o...
Article
PREMISE: Seed dispersal is extremely important for the recovery and restoration of forest communities. Relict tree genus Zelkova possesses a unique dispersal mechanism: mature fruits fall with the entire twig, and the dried leaves that are still attached function as a drag-enhancing appendage, carrying the fruits away from the parent tree. This sin...
Article
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Woodiness evolved in land plants approximately 400 Mya, and very soon after this evolutionary invention, enormous terrestrial surfaces on Earth were covered by dense and luxurious forests. Forests store close to 80% of the biosphere's biomass, and more than 60% of the global biomass is made of wood (trunks, branches and roots). Among the total numb...
Article
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Relict species play an important role in understanding the biogeography of intercontinental disjunctions. Pterocarya (a relict genus) is the valuable model taxon for studying the biogeography of East Asian versus southern European/West Asian disjunct patterns. This disjunction has not been as well studied as others (e.g., between Eastern Asia and N...
Article
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Glacial relicts, especially those with very narrow habitat requirements, are particularly affected by global warming. We considered Papaver occidentale, a glacial relict endemic to the Western Prealps, belonging to the alpine poppy complex (P. alpinum aggr.), as a model taxon to study the actual status and potential future distribution of species r...
Book
Ein Buch für Fachpersonen, das auch Laien einen guten Einstieg in die mitteleuropäische Flora ermöglicht.
Article
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Aim of study: The Caucasian apple (Malus orientalis Uglitzk.) is distributed throughout the Hyrcanian forest. Self-incompatibility (SI) is one of the most important plant strategies to prevent self-fertilization, but the genetic basis of this system has never been studied in Caucasian apple. Investigating the genetic diversity of Caucasian apple al...
Preprint
Glacial relicts, especially those with very narrow habitat requirements, are particularly affected by global warming and thus good models for studying the future biodiversity patterns of the Alps. We have used as a model taxon Papaver occidentale, a glacial relict endemic to the Western Prealps, belonging to the alpine poppy complex (P. alpinum agg...
Article
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Climatic oscillations of the Quaternary rapidly compelled plant species to shift their geographical range. How alpine plant species responded to climate change however remains elusive and remnants of the cold-adapted flora that currently strive in restricted ranges as small, isolated populations have been particularly overlooked. To address the evo...
Article
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Avec ses grandes fleurs d’un blanc éclatant, Papaver occidentale est un véritable emblème des Préalpes occidentales. Liée aux éboulis froids et raides, cette relicte glaciaire a fait des conditions extrêmes sa spécialité. Une équipe de chercheurs des universités de Fribourg et de Berne et du Musée d’histoire naturelle de Fribourg a voulu savoir com...
Article
The Alps played an important role in the biogeography of European plants and acted as a refugium for numerous species during the interglacial cycles. We investigated Nuphar pumila, one of the most emblematic glacial relicts of the Alps, by carrying out exhaustive literature and field surveys to collect relevant data on its distribution and threats....
Article
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Aim: To establish a complete database of Juglandaceae at a spatiotemporal scale and develop a phylogeographic framework with which to elucidate the distributional patterns, diversity patterns, origins, evolution, and conservation priority regions of this family. Location: Worldwide. Taxon: Walnut family (Juglandaceae) Methods: Data on the distribut...
Article
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Pterocarya stenoptera is native to China with adjacent subpopulations in Taiwan island and northern Viet Nam. It is assessed as Least Concern due to its large distribution area and abundance in riparian ecosystem across China. Change in land use and transformation of river-banks represent the main threats to the species. Due to its abundance in Chi...
Article
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Pterocarya hupehensis is an endemic tree of China growing in the vicinity of streams and rivers in mountainous habitats. The area of occupancy (AOO) is small, calculated to be 312 km2. The total number of subpopulations is approximately 80 and consist generally of a few dozen individuals only. Even if the species is frequently situated inside natur...
Article
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Pterocarya macroptera is an endemic tree of China growing in riparian habitats in mountainous regions. The area of occupancy (AOO) is low and estimated to be around 516 km2. The total number of subpopulations is estimated to be approximately 120 and the total number of mature individuals is 5,000-8,000. Alteration and destruction of its habitat sti...
Article
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Pterocarya tonkinensis is present in China, Viet Nam and Lao PDR. The species is restricted to the vicinity of rivers and streams in tropical monsoon forests. The general destruction of its habitat for human activities and logging of forested corridors along streams have already impacted the species and artificialization of river banks and construc...
Article
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Pterocarya rhoifolia is native to Japan and exhibits a large distribution across the country (Kyushu, Shikoku, Honshu and Southern Hokkaido). The species is assessed as Least Concern due to its large distribution area and abundance in the riparian environment in Japan. Degradation and artificialization of river-banks represent the main threats to t...
Article
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Pterocarya fraxinifolia is a tree located in Turkey, Iran, Azerbaijan and Georgia and grows in a riparian environment. The species could under good conditions covers important portions of alluvial plains, but due to heavy destruction and degradation of its habitat, the species is mostly restricted to the direct vicinity of rivers and streams. The p...
Article
Pterocarya fraxinifolia (Poir.) Spach (Juglandaceae) is a model relict tree species native to South Caucasus and is a typical element of threatened riparian forests. Intensive land transformations, which are common in Transcaucasia, have resulted in loss of natural habitat and population decline of the species. One of the methods of ex situ conserv...
Conference Paper
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The International Symposium on "Major refugia of relict trees" was a high-level scientific collaboration event co-sponsored by Shanghai Chenshan Botanical Garden (China) and University of Fribourg (Switzerland), which aimed to promote scientific exchange and international cooperation. This symposium in Shanghai is to provide a platform for sharing...
Article
The Hyrcanian forest of northern Iran is considered one of the potential centres for the evolution and domestication of the genus Malus (Rosaceae). However, the biogeography, phylogenetic position, and taxonomic status of the Hyrcanian wild apples have never been evaluated. In our study, the nucleotide sequences of the internal transcribed spacer (...
Technical Report
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Anticipating future challenges. The Department of Biology has changed greatly during these last years, notably in the disappearance of the former “units” to form a more flexible and hierarchically uniform structure, the reorganization of the administrative and technical staff, the establishment of platforms in bioinformatics, bioimaging, and proteo...
Technical Report
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Our work aims at exploring the evolutionary processes, biogeographical patterns and conservation issues of threatened, endemic and relict species. At the international level, the major focus of our research activities lies on woody species of the Ulmaceae (Zelkova), Juglandaceae (Pterocarya), and Salicaceae (Populus). On a national and local scale,...
Article
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Biotechnology provides valuable tools to support conservation of plant species, especially in case of threatened taxa or when dealing with seed unavailability, low viability or sterility. However, plant cell culture methods have often to face problems associated with tissue recalcitrance to in vitro systems. Recalcitrance can be related to a variet...
Article
Zelkova species, trees of the elm family (Ulmaceae), are part of the Cenozoic relict flora. In western Eurasia, the genus comprises three species that are restricted to disjunct areas (Z. sicula on Sicily, Z. abelicea on Crete and Z. carpinifolia in Transcaucasia). The situation is different in East Asia, where three species (Z. serrata, Z. schneid...
Article
Riparian trees, especially relict trees, are attractive and important for research to understand both past and recent biogeographical and evolutionary processes. Our work is the first study to elucidate the genetic diversity and spatial genetic structure of the canopy-dominating riparian Pterocarya fraxinifolia (Juglandaceae) along two altitudinal...
Book
Full-text available
Relict tree genus Zelkova: short presentation Zelkova is a small genus of relict trees belonging to the elm family (Ulmaceae). Species of Zelkova were important elements of the vast forests that prevailed throughout the Northern Hemisphere during much of the Cenozoic Era. The oldest fossils that are attributed to Zelkova date from the early Eocene...
Article
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https://www.iucnredlist.org/species/61967528/61967548 - Zelkova serrata exhibits a large distribution range in Japan, China, the Republic of Korea and the Democratic People’s Republic of Korea. However, its actual presence in the Democratic People’s Republic of Korea needs to be confirmed. The species is an important element of temperate forests a...
Article
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https://www.iucnredlist.org/species/131155483/131155485 - Zelkova sinica is an endemic tree in the mountainous region of central China. Its subpopulations are scattered and restricted to a few riparian habitats. The area of occupancy (AOO) is low and estimated to be less than 300 km2, but does not fit the supplementary conditions for the threatene...
Article
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https://www.iucnredlist.org/species/31303/131166773 - Zelkova carpinifolia is of one of the emblematic relict trees of the plant diversity-rich remnants of the Colchic and Hyrcanian forests in Iran, Azerbaijan and Georgia, with a few isolated localities in Turkey. The species is an important element of the lowland deciduous forest along the Alborz...
Article
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https://www.iucnredlist.org/species/131155456/131155458 - Zelkova schneideriana has a large distribution range in the mountainous regions of China, where the species grows in isolated and small stands in ravines and steep slopes near rivers. The area of occupancy (AOO) is low and estimated to be around 560 km2, but does not fit the supplementary c...
Article
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During the IDS Crete tour in early May 2018 members heard a lecture on the conservation of this rare Cretan endemic and visited plantation sites where trees are grown, protected from grazing goats. LAURENCE FAZAN and colleagues in Greece, Switzerland and Italy (see end of article) write about the conservation project.