10 Works

Performance and refinement of nitrogen fertilization tools

Curtis Ransom, Jason Clark, Gregory Bean, Christopher Bandura, Matthew Shafer, Newell Kitchen, James Camberato, Paul Carter, Richard Ferguson, Fabián Fernández, David Franzen, Carrie Laboski, David Myers, Emerson Nafziger & John Sawyer
Improving corn (Zea mays L.) N management is pertinent to economic and environmental objectives. However, there are limited comprehensive data sources to develop and test N fertilizer decision aid tools across a wide geographic range of soil and weather scenarios. Therefore, a public-industry partnership was formed to conduct standardized corn N rate response field studies throughout the U.S. Midwest. This research was conducted using a standardized protocol at 49 site-years across eight states over the...

Interactions with soil fungi alter density-dependence and neighborhood effects in a locally abundant dipterocarp species

Kabir Peay, Richard Segnitz & Sabrina Russo
Seedling recruitment can be strongly affected by the composition of nearby plant species. At the neighborhood scale (on the order of tens of meters), adult conspecifics can modify soil chemistry and presence of host microbes (pathogens and mutualists) across their combined canopy area or rooting zones. At local or small spatial scales (on the order of one to few meters), conspecific seed or seedling density can influence the strength of intraspecific light and resource competition...

Supplemental information for: An early burst in brachiopod evolution corresponding with significant climatic shifts during the great Ordovician biodiversification event

Curtis Congreve, Mark Patzkowsky & Peter Wagner
We employ modified tip-dating methods to date divergence times within the Strophomenoidea, one of the most abundant and species-rich brachiopod clades to radiate during the Great Ordovician Biodiversification Event (GOBE), to determine if significant environmental changes at this time correlate with the diversification of the clade. Models using origination, extinction and sampling rates to estimate prior probabilities of divergence times strongly support both high rates of anatomical change per million-years and rapid divergences shortly before...

Thermal adaptation in a holobiont accompanied by phenotypic changes in an endosymbiont

Miranda Salsbery & John DeLong
How and if organisms can adapt to changing temperatures has drastic consequences for the natural world. Thermal adaptation involves finding a match between temperatures permitting growth and the expected temperature distribution of the environment. However, if and how this match is achieved, and how tightly linked species change together, are poorly understood. Paramecium bursaria is a ciliate that has a tight physiological interaction with endosymbiotic green algae (zoochlorellae). We subjected a wild population of P....

Supplementary files for \"Creating a Universal Depth-To-Load Conversion Technique for the Conterminous United States using Random Forests\"

Jesse Wheeler, Brennan Bean & Marc Maguire
As part of an ongoing effort to update the ground snow load maps in the United States, this paper presents an investigation into snow densities for the purpose of predicting ground snow loads for structural engineering design with ASCE 7. Despite their importance, direct measurements of snow load are sparse when compared to measurements of snow depth. As a result, it is often necessary to estimate snow load using snow depth and other readily accessible...

Mountain lions reduce movement, increase efficiency during the COVID-19 shutdown

John Benson, Heather Abernathy, Jeff Sikich & Seth Riley
Wildlife strongly alter behavior in response to human disturbance; however, fundamental questions remain regarding the influence of human infrastructure and activity on animal movement. The Covid-19 pandemic created a natural experiment providing an opportunity to evaluate wildlife movement during a period of greatly reduced human activity. Speculation in scientific reviews and the media suggested that wildlife might be increasing movement and colonizing urban landscapes during pandemic slowdowns. However, theory predicts that animals should move and...

Prey diversity constrains the adaptive potential of predator foraging traits

John DeLong & Kyle Coblentz
Predators are generally under selective pressure to get better at foraging, leading to steeper functional responses and stronger predator-prey interactions. Yet strong interactions can de-stabilize food webs, and most interactions across ecological communities are thought to be weak. This conflict between evolutionary and community expectations for the strength of predator-prey interactions represents a fundamental gap in our understanding of how the evolution of foraging plays out in food webs. Here we help to resolve the...

Bird habitat preferences are related to habitat type and disturbance in the Owabi Wildlife Sanctuary, Ashanti Region (Ghana)

Collins Ayine Nsor, Nana Afua Dei Ankomah, John Mensah Nkrumah, Rockson Acolatse & Emmanuel Danquah
Context: Globally, an estimated 1.3% of the bird population has gone extinct over the last millennia largely due to loss of habitat preferences. Aims: This short-term study investigated disturbance-related drivers as predictors of bird habitat selection and assemblages in the Owabi Ramsar wetland. Methods: The study was carried out over a five-month period (May to September 2019), in four habitat types (farmlands, Built-up, forest reserve, and open water area). Data was collected in 84 plots...

A migratory sparrow has personality in winter that is independent of other traits

Theadora Block, Rachel Star, Alexis Chaine, Daizaburo Shizuka & Bruce Lyon
Small birds in winter face trade-offs between predation risk and foraging, and alternate life-history strategies may arise from these trade-offs. Animal personality shows similarities with alternative life-history strategies, and using a life-history context to understand personality can provide valuable insights. Golden-crowned sparrows, Zonotrichia atricapilla, a small migratory bird, have a complex winter social system with high site-fidelity, long-term social associations between individuals and competition mediated by badges of status. We asked whether golden-crowned sparrows show...

Phylogenomic variation at the population-species interface and assessment of gigantism in a model wolf spider genus (Lycosidae, Schizocosa)

Jason Bond, James Starrett, Ashley Bui, Rowan McGinley & Eileen Hebets
Animal body size has important evolutionary implications. The wolf spider genus Schizocosa has developed as a model for studies on courtship, with visual and vibratory signals receiving attention; however, body size has never been carefully evaluated. Although species of Schizocosa can be distinguished from their close relatives by differences in genitalic structures, male ornamentation, and behavior, some species are morphologically similar, making diagnosis, and identification difficult. Evaluation of species boundaries using genetic data across Schizocosa...

Registration Year

  • 2021
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  • University of Nebraska - Lincoln
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