10 Works

Effects of harvesting on subtidal kelp forests (Lessonia trabeculata) in Central Chile

Alejandro Pérez-Matus, Bryan Bularz, Miriam Fernández, Evie Wieters & María Dulce Subida
The systematic degradation of marine ecosystems is a global phenomenon that has important and diverse consequences including biodiversity loss and reduced ecosystem service provisions. In temperate regions, subtidal kelp forests are dominant ecosystems in rocky coasts, subjected to the influence of local-scale stressors and regional environmental variation. For example, kelps within the Humboldt Current System are at risk of degradation from live-harvesting by fisheries. However, limited information exists regarding the long-term consequences of kelp harvesting...

Chile

Enrique Núñez-Mussa

Detection histories of mesocarnivores in agricultural areas of Southern Chile

Nicolás Gálvez, José Infante, Adrián Fernandez, Jesús Díaz & Lisanne Petracca
We obtained mesocarnivore detection/non-detection data from 180 sampling units (4 km2 each) located in the agricultural landscapes of southern Chile from January-April of 2019. We used single-species occupancy models to investigate the associations of forest fragmentation, forest loss, and private land ownership subdivision (as a measure of human use intensification) with the occurrence of four mesocarnivores (güiña, grey fox, culpeo fox, and Molina’s hog-nosed skunk), and extended this framework to two-species occupancy models to assess...

Disturbance and the (surprising?) role of ecosystem engineering in explaining spatial patterns of non-native plant establishment

Meredith Root-Bernstein, Cesar Muñoz & Juan Armesto
The Intermediate Disturbance Hypothesis is widely considered to be wrong but is rarely tested against alternative hypotheses. It predicts that soil disturbances and herbivory have identical impacts on species richness via identical mechanisms (reduction in biomass and in competition). An alternative hypothesis is that the specific traits of disturbance agents (small mammals) and plants differentially affects richness or abundance of different plant groups. We tested these hypotheses on a degu (Octodon degus) colony in central...

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...

Searching for Stellar Associations in Gaia DR2

Brolan Jennings, Jeff Andrews, Marcel Agüeros & Julio Chanamé

Encapsulation of Chemotherapeutic Drug Melphalan in Cucurbit[7]uril: Effects on Its Alkylating Activity, Hydrolysis, and Cytotoxicity

Gustavo Villarroel-Lecourt, Javiera Carrasco-Carvajal, Felipe Andrade-Villalobos, Fresia Solís-Egaña, Ignacio Merino-San Martín, José Robinson-Duggon & Denis Fuentealba
The formation of inclusion complexes between drugs and macrocycles has proven to be an effective strategy to increase solubilization and stabilization of the drug, while in several cases improving their biological activity. In this context, we explored the formation of an inclusion complex between chemotherapeutic drug Melphalan (Mel) and cucurbit[7]uril (CB[7]), and studied its effect on Mel alkylating activity, hydrolysis, and cytotoxicity. The formation of the inclusion complex (Mel@CB[7]) was proven by absorption and fluorescence...

Body size variation in polyplacophoran mollusks: geographic clines and community structure along the Southeastern Pacific

Christian Ibanez, Mauricio Carter, Moises Aguilera, M. Cecilia Pardo-Gandarillas & Enrico Rezende
Aim: To evaluate the latitudinal pattern of body size within and among chiton species employing phylogenetically structured analyses, and to examine the role of geographic variation in temperature, productivity and oxygen availability as potential environmental drivers. Location: Coastal habitats of the Southeastern Pacific along a latitudinal range of nearly 6,000 km, from the Equator to Patagonia (~ 2º to 56º S). Time Period: Present (2011 – 2017). Major taxa: 31 species of polyplacophoran mollusks. Methods:...

Combining point counts and autonomous recording units improves avian survey efficacy across elevational gradients on two continents

Anna Drake, Devin R. De Zwaan, Tomás A. Altamirano, Scott Wilson, Kristina Hick, Camila Bravo, José Tomás Ibarra & Kathy Martin
Accurate biodiversity and population monitoring is a requirement for effective conservation decision-making. Survey method bias is therefore a concern, particularly when research programs face logistical and cost limitations. We employed point counts (PCs) and autonomous recording units (ARUs) to survey avian biodiversity within comparable, high elevation, temperate mountain habitats at opposite ends of the Americas: 9 mountains in British Columbia (BC), Canada and 10 in southern Chile. We compared detected species richness against multi-year species...

Registration Year

  • 2021
    10

Resource Types

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  • Journal Article
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Affiliations

  • Pontifical Catholic University of Chile
    5
  • Pontificia Universidad Católica de Chile
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  • University of Chile
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  • University of Washington
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  • The University of Texas at Austin
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  • Andrés Bello University
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