Latitudinal trend in the reproductive mode of the pea aphid Acyrthosiphon pisum invading a wide climatic rangeSebastián Martel, Carmen Ossa, Jean-Christophe Simon, Chrisitian Figueroa & Francisco Bozinovic
The maintenance of sexuality is a puzzling phenomenon in evolutionary biology. Many universal hypotheses have been proposed to explain the prevalence of sex despite its costs, but it has been hypothesized that sex could be also retained by lineage-specific mechanisms that would confer some short-term advantage. Aphids are good models to study the maintenance of sex because they exhibit coexistence of both sexual and asexual populations within the same species and because they invade a...
Thermal effects vary predictably across levels of organization: empirical results and theoretical basisEnrico Rezende, Francisco Bozinovic, Grisel Cavieres, Sebastián I. Martel, Jose Alruiz, Andrés N. Molina, Hannetz Roschzttardtz & Enrico Rezende
Thermal performance curves have provided a common framework to study the impact of temperature in biological systems. However, few generalities have emerged to date. Here we combine an experimental approach with theoretical analyses to demonstrate that performance curves are expected to vary predictably with the levels of biological organization. We measured rates of enzymatic reactions, organismal performance and population viability in Drosophila acclimated to different thermal conditions and show that performance curves become narrower with...
Der copo canelado (Portugal, 3. Jahrtausend v. Chr.) : ein möglicher Vorläufer des maritimes GlockenbechersGonçalo De Carvalho Amaro
Madrider Mitteilungen, 54 (2013)
Data accompanying ‘Microstructural controls on thermal crack damage and the presence of a temperature-memory effect during cyclic thermal stressing of rocks’ submitted for publication in Geophysical Research LettersJohn Browning, Ali Daoud, Philip Meredith & Thomas Mitchell
Acoustic emissions (AE) and ultrasonic wave velocity data recorded during a series of high temperature thermal cracking experiments by Daoud et al., in the Rock and Ice Physics Laboratory of the University College London. The data gives the time and magnitude of AE output which were recorded contemporaneously whilst cyclically heating three rock types (A Slaufrudalur Granophyre, A Santorini Andesite and a Seljadalur Basalt). The ultrasonic wave velocity data was recorded pre- and post- heating....
Data from: Rapid within- and transgenerational changes in thermal tolerance and fitness in variable thermal landscapesGrisel Cavieres, Enrico L. Rezende, Sabrina Clavijo-Baquet, Jose Alruiz, Carla Rivera-Rebella, Francisca Boher & Francisco Bozinovic
Phenotypic plasticity may increase performance and fitness and allow organisms to cope with variable environmental conditions. We studied within-generation plasticity and transgenerational effects of thermal conditions on temperature tolerance and demographic parameters in Drosophila melanogaster. We employed a fully factorial design, in which both parental (P) and offspring generations (F1) were reared in a constant or a variable thermal environment. Thermal variability during ontogeny increased heat tolerance in P, but with demographic cost as this...
This study analyses how heat stress varies with body size in ectothermic organisms. The analytical approach is based on thermal death time (TDT) curves, which take into consideration both the intensity and the duration of a thermal stress, and result in a linear relationship between temperature and the logarithm of time. We analyzed two separate heat tolerance datasets measured in mollusk, arthropod, fish, amphibian and reptile species, covering nearly 9 orders of magnitude in size....
After a catastrophe, a little bit of sex is better than nothing: genetic consequences of a major earthquake on asexual and sexual populationsRonan Becheler, Marie-Laure Guillemin, Solenn Stoeckel, Stéphane Mauger, Alice Saunier, Antonio Brante, Destombe Christophe & Valero Myriam
Catastrophic events can have profound effects on the demography of a population and consequently, on genetic diversity. The dynamics of post-catastrophic recovery as well as the role of sexual versus asexual reproduction in buffering the effects of massive perturbations remain poorly understood, in part because the opportunity to document genetic diversity before and after such events is rare. Six natural (purely sexual) and seven cultivated (mainly clonal due to farming practices) populations of the red...
Metapopulation dynamics and foraging plasticity in a highly vagile seabird, the southern rockhopper penguinNicolas Lois, Leonardo Campagna, Ulises Balza, Michael Polito, Klemens Pütz, Juliana Vianna, Annick Morgenthaler, Esteban Frere, Ricardo Saenz-Samaniego, Andrea Raya Rey & Bettina Mahler
Population connectivity is driven by individual dispersal potential and modulated by natal philopatry. In seabirds, high vagility facilitates dispersal yet philopatry is also common, with foraging area overlap often correlated with population connectivity. We assess the interplay between these processes by studying past and current connectivity and foraging niche overlap among southern rockhopper penguin colonies of the coast of southern South America using genomic and stable isotope analyses. We found two distinct genetic clusters and...
Penguins are the only extant family of flightless diving birds. They currently comprise at least 18 species, distributed from polar to tropical environments in the Southern Hemisphere. The history of their diversification and adaptation to these diverse environments remains controversial. We used 22 new genomes from 18 penguin species to reconstruct the order, timing, and location of their diversification, to track changes in their thermal niches through time, and to test for associated adaptation across...
Aim: We still lack a consensus on the main variables driving changes in migratory strategies. Different hypotheses have been proposed: productivity, energy, environmental heterogeneity, and genetic predisposition. This work takes an integrative view and analyzes migrations from a macroecological perspective estimating the extent to which different environmental variables and historic factors influence migratory life histories. Location: Global Time period: Current Major taxa studied: Actinopterygian fishes Methods: Using public domain museum records, global repositories, and global...
Collapses of food producer societies are recurrent events in prehistory and have triggered a growing concern for identifying the underlying causes of convergences/divergences across cultures around the world. One of the most studied and used as a paradigmatic case is the population collapse of the Rapa Nui society. Here, we test different hypotheses about by developing explicit population dynamic models that integrate feedbacks between climatic, demographic and ecological factors that underpinned the socio-cultural trajectory of...
Dataset and scripts from: Predicting temperature mortality and selection in natural Drosophila populationsEnrico Rezende, Francisco Bozinovic, András Szilágyi & Mauro Santos
The study develops and validates a theoretical model to predict thermal mortality under natural conditions, based on measurements of mortality performed in the laboratory at multiple constant temperatures. The theoretical model first fits a thermal tolerance landscape, which describes how survival probability is affected by both temperature and exposure time, to the empirical measurements of mortality obtained in the laboratory under controlled conditions. Then, employing a numerical approximation to the analytical solution based on differential...
Pontifical Catholic University of Chile10
Pontificia Universidad Católica de Chile3
University Austral de Chile2
University of Buenos Aires1
University of Maine1
University of Talca1
University of Oslo1
National University of Austral Patagonia1
Austral University of Chile1
School for Field Studies1