5 Works

Exploring the interplay between natural and intersexual selection on the evolution of a cognitive trait

Marie Barou-Dagues & Frédérique Dubois
There has been an increased focus on the role of natural and sexual selection in shaping cognitive abilities, but the importance of the interaction between both forces remain largely unknown. Intersexual selection through female mate choice might be an important driver of the evolution of cognitive traits, especially in monogamous species, where females may obtain direct fitness benefits by choosing mates with better cognitive abilities. However, the importance given by females to male cognitive traits...

Un air de déjà-vu au Guatemala : la lutte contre la corruption au coeur d’une nouvelle crise politique (Les Études du CERI, n° 233-234)

Nordin Lazreg
Depuis le début de l’année 2017, le bruit courait que le président Jimmy Morales envisageait de réclamer le départ du chef de la Commission internationale contre l’impunité au Guatemala (CICIG), le Colombien Iván Velásquez. En place depuis 2013, ce dernier est parvenu à redynamiser une Commission quelque peu moribonde. Sous sa direction, l’institution, mise en place par l’Organisation des nations unies en 2007 à la demande du gouvernement guatémaltèque, a gagné à la fois en...

Un cierto aire de déjà-vu en Guatemala: la lucha contra la corrupción en el centro de una nueva crisis política (Les Études du CERI, n°233-234)

Nordin Lazreg
Desde el comienzo del año, corría el rumor según el cual el presidente Jimmy Morales estaba considerando exigir la salida del país del jefe de la Comisión Internacional contra la Impunidad en Guatemala (CICIG), el colombiano Iván Velásquez. Ocupando su puesto desde el 2013, Velásquez alcanzó a redinamizar una Comisión en cierta medida moribunda.

Scan files, 3D reconstructions, data spreadsheet and supplementary files for Heterochrony and parallel evolution of echinoderm, hemichordate and cephalochordate internal bars

Nidia Álvarez Armada, Christopher Cameron, Jennifer Bauer & Imran Rahman
Deuterostomes comprise three phyla with radically different body plans. Phylogenetic bracketing of the living deuterostome clades suggests the latest common ancestor of echinoderms, hemichordates and chordates was a bilaterally symmetrical worm with pharyngeal openings, with these characters lost in echinoderms. Early fossil echinoderms with pharyngeal openings have been described, but their interpretation is highly controversial. Here, we critically evaluate the evidence for pharyngeal structures (gill bars) in the extinct stylophoran echinoderms Lagynocystis pyramidalis and Jaekelocarpus...

Circum-Arctic distribution of chemical anti-herbivore compounds arctic shrubs

Elin Lindén, Mariska Te Beest, Ilka Abreu, Thomas Moritz, Maja Sundqvist, Isabel C Barrio, Julia Boike, John Bryant, Kari Anne Bråthen, Agata Buchwal, Guillermo Bueno, Alain Cuerrier, Dagmar Egelkraut, Bruce Forbes, Martin Hallinger, Monique Heijmans, Luise Hermanutz, David S Hik, Annika Hofgaard, Milena Holmgren, Diane C Huebner, Toke Hoye, Ingibjörg Jónsdóttir, Elina Kaarlejärvi, Emilie Kissler … & Johan Olofsson
Spatial variation in plant chemical defence towards herbivores can help us understand variation in herbivore top-down control of shrubs in the Arctic and possibly also shrub responses to global warming. Less defended, non-resinous shrubs could be more influenced by herbivores than more defended, resinous shrubs. However, sparse field measurements limit our current understanding of how much of the circum-Arctic variation in defence compounds is explained by taxa or defence functional groups (resinous/non-resinous). We measured circum-Arctic...

Registration Year

  • 2022
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Affiliations

  • University of Montreal
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  • University of Eastern Finland
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  • University of Michigan–Ann Arbor
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  • University of Notre Dame
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  • University of Greifswald
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  • Centre d'Etudes Biologiques de Chizé
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  • The Arctic University of Norway
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  • Aarhus University
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  • University of Iceland
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  • University of Alaska Fairbanks
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