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Université de Fribourg

Disproportionate extinction of South American mammals drove the asymmetry of the Great American Biotic Interchange

Carrillo, Juan D. ; Faurby, Søren ; Silvestro, Daniele ; Zizka, Alexander ; Jaramillo, Carlos ; Bacon, Christine D. ; Antonelli, and Alexandre

In: Proceedings of the National Academy of Sciences, 2020, vol. 117, no. 42, p. 26281–26287

The biological interchange between North and South America associated with the formation of the Isthmus of Panama is key to defining current gradients of species diversity. A major gap in our understanding of the interchange is its asymmetry, where mammals of North American origin attained higher diversity in South America than vice versa. The prevailing view is that this asymmetry resulted...

Université de Fribourg

Sedimentary record of arc-continent collision along mesozoic SW north america (Siuna belt, Nicaragua)

Andjić, Goran ; Escuder‐Viruete, Javier ; Baumgartner‐Mora, Claudia ; Baumgartner, Peter O. ; Mitchell, Simon F. ; Caron, Michèle ; Caus, Esmeralda

In: Tectonics, 2019, vol. 38, no. 12, p. 4399–4425

The western margin of the Caribbean Plate is a typical example where oceanic and continental terranes have amalgamated by subduction, collision, and strike‐slip processes. The boundaries between these blocks, as well as their tectonostratigraphic records, are generally covered by younger deposits and dense tropical vegetation, which may hamper reconstructing the accretionary evolution of...

Université de Fribourg

Progressively excluding mammals of different body size affects community and trait structure of ground beetles

Wang, Xiaowei ; Steiner, Magdalena ; Schütz, Martin ; Vandegehuchte, Martijn L. ; Risch, Anita C.

In: Oikos, 2018, vol. 127, no. 10, p. 1515–1525

Mammalian grazing induces changes in vegetation properties in grasslands, which can affect a wide variety of other animals including many arthropods. However, the impacts may depend on the type and body size of these mammals. Furthermore, how mammals influence functional trait syndromes of arthropod communities is not well known. We progressively excluded large (e.g. red deer, chamois),...

Université de Fribourg

Male mutation bias is the main force shaping chromosomal substitution rates in monotreme mammals

Link, Vivian ; Aguilar-Gómez, Diana ; Ramírez-Suástegui, Ciro ; Hurst, Laurence D. ; Cortez, Diego

In: Genome Biology and Evolution, 2017, vol. 9, no. 9, p. 2198–2210

In many species, spermatogenesis involves more cell divisions than oogenesis, and the male germline, therefore, accumulates more DNA replication errors, a phenomenon known as male mutation bias. The extent of male mutation bias (α) is estimated by comparing substitution rates of the X, Y, and autosomal chromosomes, as these chromosomes spend different proportions of their time in the...

Université de Fribourg

Oligocene and early Miocene mammal biostratigraphy of the Valley of Lakes in Mongolia

Harzhauser, Mathias ; Daxner-Höck, Gudrun ; Erbajeva, Margarita A. ; López-Guerrero, Paloma ; Maridet, Olivier ; Oliver, Adriana ; Piller, Werner E. ; Göhlich, Ursula B. ; Ziegler, Reinhard

In: Palaeobiodiversity and Palaeoenvironments, 2017, vol. 97, no. 1, p. 219–231

The Taatsiin Gol Basin in Mongolia is a key area for understanding the evolution and dispersal of Central Asian mammal faunas during the Oligocene and early Miocene. After two decades of intense fieldwork, the area is extraordinarily well sampled and taxonomically well studied, yielding a large dataset of 19,042 specimens from 60 samples. The specimens represent 176 species-level and 99...

Université de Fribourg

A review of the fossil record of basal mesozoic turtles

Joyce, Walter G.

In: Bulletin of the Peabody Museum of Natural History, 2017, vol. 58, no. 1, p. 65–113

Turtles (Testudinata) are the clade of amniotes characterized by a complete turtle shell. New insights into the phylogeny of the group have revealed that a diverse assemblage of fossil turtles populate the stem lineage that lead to the turtle crown (Testudines). To aid communication, the terms Mesochelydia and Perichelydia are herein defined for two internested clades more inclusive than...

Université de Fribourg

Guelb el Ahmar (Bathonian, Anoual Syncline, eastern Morocco): First continental flora and fauna including mammals from the Middle Jurassic of Africa

Haddoumi, Hamid ; Allain, Ronan ; Meslouh, Said ; Metais, Grégoire ; Monbaron, Michel ; Pons, Denise ; Rage, Jean-Claude ; Vullo, Romain ; Zouhri, Samir ; Gheerbrant, Emmanuel

In: Gondwana Research, 2016, vol. 29, no. 1, p. 290–319

We report the discovery in Mesozoic continental “red beds” of Anoual Syncline, Morocco, of the new Guelb el Ahmar (GEA) fossiliferous sites in the Bathonian Anoual Formation. They produced one of the richest continental biotic assemblages from the Jurassic of Gondwana, including plants, invertebrates and vertebrates. Both the sedimentological facies and the biotic assemblage indicate a...

Université de Fribourg

Intraspecific trait variation is correlated with establishment success of alien mammals

González-Suárez, Manuela ; Bacher, Sven ; Jeschke, Jonathan M.

In: The American Naturalist, 2015, vol. 185, no. 6, p. 737–746

Many studies have aimed to identify common predictors of successful introductions of alien species, but the search has had limited success, particularly for animals. Past research focused primarily on mean trait values, even though genetic and phenotypic variation has been shown to play a role in establishment success in plants and some animals (mostly invertebrates). Using a global database...