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Université de Fribourg

Fossil lizards and snakes from Ano Metochi – a diverse squamate fauna from the latest Miocene of northern Greece

Georgalis, Georgios L. ; Villa, Andrea ; Delfino, Massimo

In: Historical Biology, 2017, vol. 29, no. 6, p. 730–742

We here describe a new squamate fauna from the late Miocene (Messinian, MN 13) of Ano Metochi, northern Greece. The lizard fauna of Ano Metochi is here shown to be rather diverse, consisting of lacertids, anguids, and potential cordylids, while snakes are also abundant, consisting of scolecophidians, natricines and at least two different colubrines. If our identification is correct, the Ano...

Université de Fribourg

Morphological differentiation of leaves in the relict tree Zelkova carpinifolia (Ulmaceae)

Jasińska, Anna K. ; Rucińska, Beata ; Kozlowski, Gregor ; Bétrisey, Sébastien ; Safarov, Hajiaga ; Boratyńska, Krystyna ; Boratyński, Adam

In: Dendrobiology, 2016, vol. 74, p. 109–122

Zelkova carpinifolia is a relict tree occurring in refugial zones of south-western Eurasia. The main aim of the study was the biometrical comparison of the leaf characteristics of the species sampled in three regions of Transcaucasia. We aimed to test the hypotheses that (1) leaves from vegetative (L) shoots would be larger and more variable than those from fertile (S) shoots, (2) the leaves...

Université de Fribourg

A Review of the fossil record of turtles of the clade Baenidae

Joyce, Walter G. ; Lyson, Tyler R.

In: Bulletin of the Peabody Museum of Natural History, 2015, vol. 56, no. 2, p. 147–183

The fossil record of the turtle clade Baenidae ranges from the Early Cretaceous (Aptian—Albian) to the Eocene. The group is present throughout North America during the Early Cretaceous, but is restricted to the western portions of the continents in the Late Cretaceous and Paleogene. No credible remains of the clade have been reported outside of North America to date. Baenids were warmadapted...

Université de Fribourg

Biological Flora of the British Isles: Ambrosia artemisiifolia

Essl, Franz ; Biró, Krisztina ; Brandes, Dietmar ; Broennimann, Olivier ; Bullock, James M. ; Chapman, Daniel S. ; Chauvel, Bruno ; Dullinger, Stefan ; Fumanal, Boris ; Guisan, Antoine ; Karrer, Gerhard ; Kazinczi, Gabriella ; Kueffer, Christoph ; Laitung, Beryl ; Lavoie, Claude ; Leitner, Michael ; Mang, Thomas ; Moser, Dietmar ; Müller-Schärer, Heinz ; Petitpierre, Blaise ; Richter, Robert ; Schaffner, Urs ; Smith, Matt ; Starfinger, Uwe ; Vautard, Robert ; Vogl, Gero ; Lippe, Moritz von der ; Follak, Swen

In: Journal of Ecology, 2015, vol. 103, no. 4, p. 1069–1098

This account presents information on all aspects of the biology of Ambrosia artemisiifolia L. (Common ragweed) that are relevant to understanding its ecology. The main topics are presented within the standard framework of the Biological Flora of the British Isles: distribution, habitat, communities, responses to biotic factors, responses to environment, structure and physiology, phenology, floral...

Université de Fribourg

A Review of the Fossil Record of Turtles of the Clades Platychelyidae and Dortokidae

Cadena, Edwin ; Joyce, Walter G.

In: Bulletin of the Peabody Museum of Natural History, 2015, vol. 56, no. 1, p. 3–20

The fossil record of platychelyid turtles expands from the Late Jurassic (Oxfordian) of Cuba to the Early Cretaceous (Valanginian) of Colombia. Platychelyids were adapted to freshwater to coastal environments. Current phylogenies confidently suggest that platychelyids are situated along the stem lineage of crown Pleurodira. A taxonomic review of the group concludes that of six named...

Université de Fribourg

A review of the fossil record of turtles of the clade Pan-Carettochelys


In: Bulletin of the Peabody Museum of Natural History, 2014, vol. 55, no. 1, p. 3–33

Turtles of the total clade Pan-Carettochelys have a relatively poor fossil record that extends from the Early Cretaceous. The clade is only found in Asia during the Cretaceous, but spreads to Europe and North America during the Eocene. Neogene finds are restricted to Europe, Africa and Australia, whereas the only surviving species, Carettochelys insculpta, lives in New Guinea and the Northern...

Université de Fribourg

Effects of soil fungi, disturbance and propagule pressure on exotic plant recruitment and establishment at home and abroad

Maron, John L. ; Waller, Lauren P. ; Hahn, Min A. ; Diaconu, Alecu ; Pal, Robert W. ; Müller-Schärer, Heinz ; Klironomos, John N. ; Callaway, Ragan M.

In: Journal of Ecology, 2013, p. -

Biogeographic experiments that test how multiple interacting factors influence exotic plant abundance in their home and recipient communities are remarkably rare. We examined the effects of soil fungi, disturbance and propagule pressure on seed germination, seedling recruitment and adult plant establishment of the invasive Centaurea stoebe in its native European and non-native North American...

Université de Fribourg

Biosystematic study of the diploid-polyploid Pilosella alpicola group with variation in breeding system: Patterns and processes

Šingliarová, Barbora ; Hodálová, Iva ; Mráz, Patrik

In: Taxon, 2011, vol. 60, no. 2, p. 450-470

Members of the Pilosella alpicola species group (Asteraceae) are distributed throughout the alpine region of the European mountains (Alps, Carpathians, Balkan mountains). Like other Pilosella species groups (Hieracium subg. Pilosella ), the taxonomy and species' relationships are poorly understood mostly due to widespread facultative apomixis, frequent hybridization and polyploidization—the...

Université de Fribourg

Shift in cytotype frequency and niche space in the invasive plant Centaurea maculosa

Treier, Urs A. ; Broennimann, Olivier ; Normand, Signe ; Guisan, Antoine ; Schaffner, Urs ; Steinger, Thomas ; Müller-Schärer, Heinz

In: Ecology, 2009, vol. 90, no. 5, p. 1366-1377

Polyploidy is often assumed to increase the spread and thus the success of alien plant species, but few empirical studies exist. We tested this hypothesis with Centaurea maculosa Lam., a species native to Europe and introduced into North America approximately 120 years ago where it became highly invasive. We analyzed the ploidy level of more than 2000 plants from 93 native and 48 invasive C....