72 Works

Metapopulation dynamics and foraging plasticity in a highly vagile seabird, the southern rockhopper penguin

Nicolas 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...

Shrinking dinosaurs and the evolution of endothermy in birds

Enrico Rezende
The evolution of endothermy represents a major transition in vertebrate history and a major factor underlying the diversity of birds and mammals. Despite the several advantages of an endothermic lifestyle, the tempo and mode of the evolution of endothermy in these lineages remains one of the most controversial subjects in paleontology and evolutionary physiology. Here, we combine a heat transfer model with body size estimates in the theropod phylogeny to reconstruct the evolution of metabolic...

Data from: Comparative phylogeography of three host sea anemones in the Indo-Pacific

Pablo Saenz-Agudelo, Madeleine Emms, Emily Giles, Remy Gatins, Gerrit Nanninga, Anna Scott, Jean Paul Hobbs, Ashley Frisch, Suzanne Mills, Ricardo Beldade & Michael Berumen
Aim The mutualistic relationship between anemones and anemonefishes is one of the most iconic examples of symbiosis. However, while anemonefishes have been extensively studied in terms of genetic connectivity, such information is lacking entirely for host sea anemones. Here, we provide the first information on the broad-scale population structure and phylogeographic patterns of three species of host sea anemone, Heteractis magnifica, Stichodactyla mertensii, and Entacmaea quadricolor. We evaluate if there is concordance in genetic structure...

After a catastrophe, a little bit of sex is better than nothing: genetic consequences of a major earthquake on asexual and sexual populations

Ronan 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...

Data from: Partitioning the effects of regional, spatial and local variables on beta diversity of salt marsh arthropods in Chile

Cristina Coccia & Jose M. Fariña
Aim: We examined the influence of regional, spatial and local variables (edaphic characteristics and vegetation structure) on patterns of arthropod variation along the Chilean coast by partitioning beta diversity into its turnover and nestedness components. Location: 2000 km along the coast of Chile Methods: We collected ground-dwelling arthropod samples from 9 marshes during two seasons. A clustering method was used to examine patterns of arthropod similarity across salt marshes. We also calculated multiple site beta...

Thermal tolerance in Drosophila: repercussions for distribution, community coexistence and responses to climate change

José M. Alruiz, Ignacio Peralta-Maraver, Francisco Bozinovic, Mauro Santos & Enrico L. Rezende
Here we combined controlled experiments and field surveys to determine if estimates of heat tolerance predict distributional ranges and phenology of different Drosophila species in southern South America. We contrasted thermal death time curves, which consider both magnitude and duration of the challenge to estimate heat tolerance, against the thermal range where populations are viable based on field surveys in an 8-yr longitudinal study. We observed a strong correspondence of the physiological limits, the thermal...

Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile

Sergio Soto-Acuña, Alexander Vargas & Joao F. Botelho
Armoured dinosaurs are well known for their evolution of specialized tail weapons— paired tail spikes in stegosaurs and heavy tail clubs in advanced ankylosaurs1. Armoured dinosaurs from southern Gondwana are rare and enigmatic, but probably include the earliest branches of Ankylosauria2–4. Here we describe a mostly complete, semi-articulated skeleton of a small (approximately 2 m) armoured dinosaur from the late Cretaceous period of Magallanes in southernmost Chile, a region that is biogeographically related to West...

Data For: The developing bird pelvis passes through ancestral Archosaurian and Dinosaurian conditions

Christopher Griffin, João Botelho, Michael Hanson, Matteo Fabbri, Daniel Smith-Paredes, Ryan Carney, Mark Norell, Shiro Egawa, Stephen Gatesy, Timothy Rowe, Ruth Elsey, Sterling Nesbitt & Bhart-Anjan Bhullar
Living birds (Aves) have bodies dramatically modified from the ancestral reptilian condition. The avian pelvis in particular experienced dramatic changes during the transition from early archosaurs to living birds. This stepwise transformation is well documented by an excellent fossil record; however, the ontogenetic alterations that underly it are less well-understood. We used embryological imaging techniques to examine the morphogenesis of avian pelvic tissues in three dimensions, allowing direct comparison with the fossil record. Many ancestral...

Data from: The origins of global biodiversity on land, sea, and freshwater

Cristian Román-Palacios, Daniela Moraga-López & John Wiens
Many biodiversity studies focus on explaining high tropical species richness, but an equally dramatic yet understudied pattern involves the divergent richness of land, sea, and freshwater. Here, we reveal the origins of these richness differences among habitats across animals and plants. Most plant and animal species are terrestrial, although these habitats cover only ~28% of Earth’s surface. Marine habitats have fewer species over a larger area (~70%). Freshwater habitats have relatively high richness and exceptional...

Additional file 1 of Secondary respiratory early and late infections in mechanically ventilated patients with COVID-19

María Elena Ceballos, Carolina Nuñez, Javier Uribe, María Magdalena Vera, Ricardo Castro, Patricia García, Gabriel Arriata, Vicente Gándara, Camila Vargas, Angélica Dominguez, Inés Cerón, Pablo Born & Eduardo Espíndola
Additional file 1: Table S1. Microbiological investigation available in our center.

Additional file 1 of Secondary respiratory early and late infections in mechanically ventilated patients with COVID-19

María Elena Ceballos, Carolina Nuñez, Javier Uribe, María Magdalena Vera, Ricardo Castro, Patricia García, Gabriel Arriata, Vicente Gándara, Camila Vargas, Angélica Dominguez, Inés Cerón, Pablo Born & Eduardo Espíndola
Additional file 1: Table S1. Microbiological investigation available in our center.

Health and economic effects on patients with type 2 diabetes mellitus in the long run: predictions for the Chilean population

Manuel Antonio Espinoza, Tomas Abbott, Alvaro Passi & Carlos Balmaceda
Abstract Background Diabetes is associated to a high financial and disease burden, explaining a large proportion of expenditure of the health system in one year. The purpose of this study was to estimate long-term costs and health outcomes of recently diagnosed patients with type 2 diabetes in Chile. Methods Cost and consequence study based on mathematical discrete event simulation (DES) model. We modelled expected costs (USD) and quality-adjusted life-years (QALYs) from diagnosis to death (or...

Additional file 1 of Health and economic effects on patients with type 2 diabetes mellitus in the long run: predictions for the Chilean population

Manuel Antonio Espinoza, Tomas Abbott, Alvaro Passi & Carlos Balmaceda
Additional file 1: Expected costs and outcomes of the outcome based subgroup analysis.

Alignments and phylogenetic tree from: A new endemic species of Loasa ser. Macrospermae from northern Chile

Ludovica Santilli, Nicolas Lavandero, Claire De Schrevel, Philippe Dandois & Rafael Acuña
Alignments used for the phylogenetic work and raw phylogenetic trees obtained. A new species of Loasa, endemic‌ ‌to‌ ‌the‌ ‌northern ‌Andes‌ ‌‌of‌ ‌Chile‌ is described and evaluated, under the IUCN criteria for conservation, as critically endangered. Molecular analyses based on plastid markers place the new species within the Loasa ser. Macrospermae, with high support, and specifically as sister to Loasa acerifolia. A key to and comparative plates including all the 13 known species of Loasa...

Data from: Diet reveals links between morphology and foraging in a cryptic temperate reef fish

Natalia S. Winkler, Maite Paz-Goicoechea, Robert W. Lamb & Alejandro Pérez-Matus
Predators select prey so as to maximize energy and minimize manipulation time. In order to reduce prey detection and handling time, individuals must actively select their foraging space (microhabitat) and populations exhibit morphologies that are best suited for capturing locally available prey. We explored how variation in diet correlates with habitat type, and how these factors influence key morphological structures (mouth gape, eye diameter, fin length, fin area, and pectoral fin ratio) in a common...

Data from: Fluctuating thermal environments and time-dependent effects on fruit fly egg-hatching performance

Grisel Cavieres, Jose M. Bogdanovich, Paloma Toledo & Francisco Bozinovic
Organismal performance in a changing environment is dependent on temporal patterns and duration of exposure to thermal variability. We experimentally assessed the time-dependent effects of thermal variability (i.e. patterns of thermal exposure) on the hatching performance of Drosophila melanogaster. Flies were collected in central Chile and maintained for four generations in laboratory conditions. Fourth generation eggs were acclimated to different thermal fluctuation cycles until hatching occurred. Our results show that the frequency of extreme thermal...

Data from: The positive side of a negative reference: the delay between linguistic processing and common ground

Edmundo Kronmüller, Ira Noveck, Natalia Rivera, Francisco Jaume-Guazzini & Dale Barr
Interlocutors converge on names to refer to entities. For example, a speaker might refer to a novel looking object as the jellyfish and, once identified, the listener will too. The hypothesized mechanism behind such referential precedents is a subject of debate. The common ground view claims that listeners register the object as well as the identity of the speaker who coined the label. The linguistic view claims that, once established, precedents are treated by listeners...

Thermal effects vary predictably across levels of organization: empirical results and theoretical basis

Enrico 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...

Latitudinal trend in the reproductive mode of the pea aphid Acyrthosiphon pisum invading a wide climatic range

Sebastián 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...

Countering misinformation in and from the newsroom: How digital platforms redefine journalistic practice and the democratic role of news media

Eva Mayerhöffer, Marinella Belluati, Brooks DeCillia, Leen d’Haenens, Alice Fubini, Wai Han Lo, Enrique Núñez-Mussa, Jón Gunnar Ólafsson & Rossella Rega

The professionalisation of journalism: Global trends and the challenges of training and job insecurity

Christian Ruggiero, Achilleas Karadimitriou, Wai Han Lo, Enrique Núñez-Mussa, Mauro Bomba & Simone Sallusti

Searching for Stellar Associations in Gaia DR2

Brolan Jennings, Jeff Andrews, Marcel Agüeros & Julio Chanamé

Heat tolerance of marine ectotherms in a warming Antarctica

Enrico Rezende, Andres Molina, José Pulgar & Mauricio Carter
Global warming is affecting the Antarctic continent in complex ways. Because Antarctic organisms are specialized to living in the cold, they are vulnerable to increasing temperatures, though quantitative analyses of this issue are currently lacking. Here we compiled a total of 184 estimates of heat tolerance belonging to 39 marine species and quantified how survival is affected concomitantly by the intensity and duration of a thermal stress. Species exhibit thermal limits displaced towards colder temperatures,...

Secondary respiratory early and late infections in mechanically ventilated patients with COVID-19

María Elena Ceballos, Carolina Nuñez, Javier Uribe, María Magdalena Vera, Ricardo Castro, Patricia García, Gabriel Arriata, Vicente Gándara, Camila Vargas, Angélica Dominguez, Inés Cerón, Pablo Born & Eduardo Espíndola
Abstract Background Patients with COVID-19 receiving mechanical ventilation may become aggravated with a secondary respiratory infection. The aim of this study was to describe secondary respiratory infections, their predictive factors, and outcomes in patients with COVID-19 requiring mechanical ventilation. Methods A cohort study was carried out in a single tertiary hospital in Santiago, Chile, from 1st June to 31st July 2020. All patients with COVID-19 admitted to the intensive care unit that required mechanical ventilation...

Additional file 2 of Health and economic effects on patients with type 2 diabetes mellitus in the long run: predictions for the Chilean population

Manuel Antonio Espinoza, Tomas Abbott, Alvaro Passi & Carlos Balmaceda
Additional file 2: Baseline characteristics of the microstimulated cohort and meta-analyzed utility values.

Registration Year

  • 2022
    24
  • 2021
    10
  • 2020
    13
  • 2019
    4
  • 2018
    5
  • 2017
    5
  • 2016
    6
  • 2014
    3
  • 2012
    2

Resource Types

  • Dataset
    53
  • Text
    8
  • Book Chapter
    4
  • Collection
    4
  • Journal Article
    3

Affiliations

  • Pontifical Catholic University of Chile
    46
  • Pontificia Universidad Católica de Chile
    26
  • University Austral de Chile
    9
  • University of Chile
    6
  • Andrés Bello University
    4
  • University of Buenos Aires
    2
  • University of Tennessee at Chattanooga
    2
  • Universidad Mayor
    2
  • University of Glasgow
    2
  • Hong Kong Baptist University
    2