14 Works

Default Dependence: The Equity Default Relationship

Stuart M. Turnbull & Jun Yang
The paper examines three equity-based structural models to study the nonlinear relationship between equity and credit default swap (CDS) prices. These models differ in the specification of the default barrier. With cross-firm CDS premia and equity information, we are able to estimate and compare the three models. We find that the stochastic barrier model performs better than the constant and uncertain barrier models in terms of both in-sample fit and out-of-sample forecasting of CDS premia....

Relationships between plant-soil feedbacks and functional traits

Nianxun Xi, Peter Adler, Dongxia Chen, Hangyu Wu, Jane Catford, Peter Van Bodegom, Michael Bahn, Kerri Crawford & Chengjin Chu
Plant-soil feedbacks (PSF) and functional traits are two active but not well theoretically integrated areas of research. However, PSF and traits are both affected by life history evolution, so the two should theoretically be related. We provide a conceptual framework to link plant functional traits to two types of PSF metrics, and hypothesize that individual PSF (plant performance in conspecific versus heterospecific soil) should be related to the fast-slow trait spectrum, while pairwise PSF (the...

Plant genotypic diversity effects on soil nematodes vary with trophic level

Jihua Wu, Jun Yan, Youzheng Zhang, Kerri M. Crawford, Xiaoyong Chen & Shuo Yu
At local spatial scales, loss of genetic diversity within species can lead to species loss. Few studies, however, have examined plant genotypic diversity effects across trophic levels. We investigated genotypic diversity effects of Phragmites australis on belowground biomass and soil nematode communities. Our results revealed belowground plant biomass and nematode abundance responses to plant genotypic diversity were uncoupled. Decreasing plant genotypic diversity decreased the abundance of lower, but not higher trophic level nematodes. Low plant...

Diversity Residency Toolkit

Kalani Adolpho, Maya Bergamasco, Ana Corral, , , & Liburd Tavernier W

Dataset for: Fast retreat of Pope, Smith, and Kohler glaciers in West Antarctica observed by satellite interferometry

Pietro Milillo, Eric Rignot, Paola Rizzoli, Bernd Scheuchl, Jeremie Mouginot, Jose Luis Bueso Bello, Pau Prats Iraola & Luigi Dini
Pope, Smith, and Kohler glaciers, in the Amundsen Sea Embayment of West Antarctica, have experienced enhanced ocean-induced ice-shelf melt, glacier acceleration, ice thinning, and grounding line retreat in the past thirty years, in a glaciological setting with retrograde bedrock slopes conducive to marine ice sheet instability. Here we present observations of the grounding line retreat of these glaciers since 2014 using a constellation of interferometric radar satellites with a short revisit cycle combined with precision...

Amitosis confers benefits of sex in the absence of sex to Tetrahymena

Hao Zhang, Joe West, Rebecca Zufall & Ricardo Azevedo
Sex appears to be the most successful reproductive strategy in eukaryotes despite its many costs. While a complete explanation for sex's success remains elusive, several evolutionary benefits of sex have been identified. It is predicted that, by forgoing these benefits, asexual lineages are evolutionary dead-ends. Consistent with this prediction, many asexual lineages show signs of accelerated accumulation of deleterious mutations compared to their sexual relatives. Despite these low expectations, some asexual eukaryotic lineages appear to...

Scheduling Mechanisms to Control Spread of Covid-19 (Simulation Results)

Khalid Hourani, John Augustine, Anisur Molla, Gopal Pandurangan & Adi Pasic
We study scheduling mechanisms that explore the trade-off between containing the spread of COVID-19 and performing in-person activity in organizations. Our mechanisms, referred to as group scheduling, are based on partitioning the population randomly into groups and scheduling each group on appropriate days with possible gaps (when no one is working and all are quarantined). Each group interacts with no other group and, importantly, any person who is symptomatic in a group is quarantined. We...

Lo que se nos escapa al viajar: apercepción en Amado Nervo

José Ramón Ruisánchez Serra
pp. 107-116 This article explores the travel writing of Amado Nervo in El éxodo y las flores del camino, the 1902 volume that colects the sketches of a 1900 trip to the World Fair in Paris, both in prose and in verse. In my reading I privilege the «absential»: instead of the tourist magnets, the way that they let down Nervo, and the way he writes about it with peculiar sincerity. This sincere articulation of...

Consistent pattern of higher lability of leaves from high latitudes for both native Phragmites australis and exotic Spartina alterniflora

Youzheng Zhang, Steven Pennings, Zixia Liu, Bo Li & Jihua Wu
1. Global variation in litter decomposition rates is driven by climate, decomposer taxa and litter quality. Most large-scale studies of litter quality have made comparisons across species, rather than within a species sourced from different latitudes. Here, we aim to explore latitudinal variation in leaf litter decomposition rate and litter quality within a species. 2. We investigated whether the typical interspecific pattern of increased litter lability at higher latitudes also holds within plant species, by...

Experimental treatments and survival of transplanted harvester ant colonies

Blaine Cole & Diane Wiernasz
In sessile organisms such as plants and benthic invertebrates, founding propagules typically suffer extremely high rates of mortality due to both extrinsic and intrinsic factors. Many social insect species share similarities with these groups, but factors influencing early colony survival are relatively unstudied. We used a field experiment to measure the importance of environmental quality relative to intrinsic colony properties in the harvester ant, Pogonomyrmex occidentalis, by monitoring the survival of 584 experimental colonies. Colony...

Dataset for: Hepatoenteric recycling is a new disposition mechanism for orally administered phenolic drugs and phytochemicals in rats

Yifan Tu
Many orally administered phenolic drugs undergo enterohepatic recycling (EHR), presumably mediated by the hepatic phase II enzymes. However, the disposition of extrahepatically generated phase II metabolites is unclear. This paper aims to determine the new roles of liver and intestine in the disposition of oral phenolics. 16 representative were tested using direct portal vein infusion and/or intestinal perfusion. The results showed that certain glucuronides were efficiently recycled by liver. OATP1B1/1B3/2B1 were the responsible uptake transporters....

Thermal tolerance and preference are both consistent with the clinal distribution of house fly proto-Y chromosomes

Kiran Adhikari, Pablo Delclos, Jessica Cambric, Anna Matuk, Rebecca Presley, Jessica Tran & Richard Meisel
Selection pressures can vary within localized areas and across massive geographical scales. Temperature is one of the best studied ecologically variable abiotic factors that can affect selection pressures across multiple spatial scales. Organisms rely on physiological (thermal tolerance) and behavioral (thermal preference) mechanisms to thermoregulate in response to environmental temperature. In addition, spatial heterogeneity in temperatures can select for local adaptation in thermal tolerance, thermal preference, or both. However, the concordance between thermal tolerance and...

Growth rates of populations evolved and assayed at two temperatures for 6500 generations

Jason Tarkington & Rebecca Zufall
Evolutionary biologists have long sought to understand what factors affect the repeatability of adaptive outcomes. To better understand the role of temperature in determining the repeatability of adaptive trajectories, we evolved populations of different genotypes of the ciliate Tetrahymena thermophila at low and high temperatures and followed changes in growth rate over 6,500 generations. As expected, growth rate increased with a decelerating rate for all populations; however, there were differences in the patterns of evolution...

The Economic Value of Realized Volatility: Using High-Frequency Returns for Option Valuation

Peter Christoffersen, Bruno Feunou, Kris Jacobs & Nour Meddahi
Many studies have documented that daily realized volatility estimates based on intraday returns provide volatility forecasts that are superior to forecasts constructed from daily returns only. We investigate whether these forecasting improvements translate into economic value added. To do so we develop a new class of affine discrete-time option valuation models that use daily returns as well as realized volatility. We derive convenient closed-form option valuation formulas and we assess the option valuation properties using...

Registration Year

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Affiliations

  • University of Houston
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  • Texas State Library and Archives Commission
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  • Stanford University
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  • Toulouse School of Economics
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  • Indian Statistical Institute
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