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Université de Fribourg

Litter decomposition driven by soil fauna, plant diversity and soil management in urban gardens

Tresch, Simon ; Frey, David ; Le Bayon, Renée-Claire ; Zanettac, Andrea ; Rasche, Frank ; Fliessbach, Andreas ; Moretti, Marco

In: Science of The Total Environment, 2019, vol. 658, p. 1614–1629

In the face of growing urban densification, green spaces in cities, such as gardens, are increasingly important for biodiversity and ecosystem services. However, the influences of urban green space management on biodiversity and ecosystem functioning (BEF) relationships is poorly understood. We investigated the relationship between soil fauna and litter decomposition in 170 urban garden sites...

Université de Fribourg

A gardener’s influence on urban soil quality

Tresch, Simon ; Moretti, Marco ; Le Bayon, Renée-Claire ; Mäder, Paul ; Zanetta, Andrea ; Frey, David ; Fliessbach, Andreas

In: Frontiers in Environmental Science, 2018, vol. 6, p. -

Gardens are hot spots for urban biodiversity and provide habitats for many plant and animal species, both above- and below-ground. Furthermore, gardens provide a wide range of ecosystem services, including carbon (C) storage and nutrient cycling. Although the soil is the foundation of sustainable gardens providing those ecosystem services, very little is known about the consequences of garden...

Université de Fribourg

Parallel declines in species and genetic diversity driven by anthropogenic disturbance: a multispecies approach in a French Atlantic dune system

Frey, David ; Arrigo, Nils ; Granereau, Gilles ; Sarr, Anouk ; Felber, François ; Kozlowski, Gregor

In: Evolutionary Applications, 2016, p. -

Numerous studies assess the correlation between genetic and species diversities, but the processes underlying the observed patterns have only received limited attention. For instance, varying levels of habitat disturbance across a region may locally reduce both diversities due to extinctions, and increased genetic drift during population bottlenecks and founder events. We investigated the...

Université de Fribourg

Footprints of past intensive diversification and structuring in the genus Zelkova (Ulmaceae) in south-western Eurasia

Christe, Camille ; Kozlowski, Gregor ; Frey, David ; Bétrisey, Sébastien ; Maharramova, Elmira ; Garfì, Giuseppe ; Pirintsos, Stergios ; Naciri, Yamama

In: Journal of Biogeography, 2014, p. -

Aim: To elucidate the phylogeographical patterns in three Cenozoic relict species: Zelkova sicula, Z. abelicea and Z. carpinifolia (Ulmaceae).Location: Sicily, Crete and Transcaucasia.Methods: Two chloroplast loci (trnH–psbA and trnL) and the nuclear ribosomal markers ITS1 and ITS2 were sequenced for 154 samples collected from 14 populations of Z. abelicea, 16 populations of Z. carpinifolia,...

Université de Fribourg

The Tertiary relict tree Zelkova abelicea (Ulmaceae): distribution, population structure and conservation status on Crete

Kozlowski, Gregor ; Frey, David ; Fazan, Laurence ; Egli, Bernhard ; Bétrisey, Sébastien ; Gratzfeld, Joachim ; Garfì, Giuseppe ; Pirintsos, Stergios

In: Oryx, 2013, p. -

Relict species provide a unique opportunity to understand past and recent biogeographical and evolutionary processes. Zelkova abelicea (Ulmaceae), which is endemic to the island of Crete (Greece), is one of the most prominent Tertiary relict trees of the Mediterranean region. We collected distribution, threat and population structure data by reviewing literature and herbaria and through field...

Université de Fribourg

Conservation of threatened relict trees through living ex situ collections: lessons from the global survey of the genus Zelkova (Ulmaceae)

Kozlowski, Gregor ; Gibbs, Douglas ; Huan, Fan ; Frey, David ; Gratzfeld, Joachim

In: Biodiversity and Conservation, 2012, vol. 21, no. 3, p. 671-685

Maintaining living ex situ collections is one of the key conservation methods in botanic gardens worldwide. Despite of the existence of many other conservation approaches used nowadays, it offers for many endangered plants an important insurance policy for the future, especially for rare and threatened relict trees. The aim of this research was to investigate the global extent of living ex situ...