162 Works

Data from: Phylogenetic patterns of trait and trait plasticity evolution: Insights from amphibian embryos

Rick Relyea, Patrick R. Stephens, Lisa N. Barrow, Andrew Blaustein, Paul Bradley, Julia Buck, Ann Chang, Brian I Crother, James Collins, Julia Earl, Stephanie S. Gervasi, Jason T. Hoverman, Olliver Hyman, Emily Claire Moriarty Lemmon, Thomas Luhring, Moses Michelsohn, Christopher M. Murray, Steven Price, Raymond Semlitsch, Andy Sih, Aaron Stoler, Nick VandenBroek, Alexa Warwick, Greta Wengert, John Hammond … & Aaron B. Stoler
Environmental variation favors the evolution of phenotypic plasticity. For many species, we understand the costs and benefits of different phenotypes, but we lack a broad understanding of how plastic traits evolve across large clades. Using identical experiments conducted across North America, we examined prey responses to predator cues. We quantified five life history traits and the magnitude of their plasticity for 23 amphibian species/populations (spanning three families and five genera) when exposed to no cues,...

Data from: Modification of wheat gluten for improvement of binding capacity with keratin in hair

Shukun Wang, Danyang Meng, Sisi Wang, Zhong Zhang, Ruijin Yang & Wei Zhao
In this study, enzymatic hydrolysis and cationization with epoxypropyldodecyldimethylammonium chloride of wheat protein, an economic protein complex containing great amount of disulfide bonds, were conducted to improve properties such as solubility and disassociation behaviour for recovery of damaged hair when used in shampoo. The optimal conditions for enzymatic hydrolysis were pH 8.2, 55°C with Alcalase for 60 min. After the selected hydrolysis, the degree of hydrolysis, nitrogen solubility index, foaming capacity index, foam stability index,...

Data from: Field evidence challenges the often-presumed relationship between early male maturation and female-biased sexual size dimorphism

Marie-Claire Chelini & Eileen Hebets
Female‐biased sexual size dimorphism (SSD) is often considered an epiphenomenon of selection for the increased mating opportunities provided by early male maturation (i.e., protandry). Empirical evidence of the adaptive significance of protandry remains nonetheless fairly scarce. We use field data collected throughout the reproductive season of an SSD crab spider, Mecaphesa celer, to test two hypotheses: Protandry provides fitness benefits to males, leading to female‐biased SSD, or protandry is an indirect consequence of selection for...

Data from: High soil test phosphorus effect on corn yield

Charles Wortmann, Charles Shapiro, Tim Shaver & Michael Mainz Retired
Phosphorus removal in crop harvest has increased as yields have increased. Fertilizer P use guidelines are based on calibrations often developed for much lower yield levels and may need recalibration. Corn yields may be greater with higher than recommended soil test P when springs are relatively wet and cool. Research was conducted across 12 irrigated and five rainfed siteyr in Nebraska with initial Bray-1 P ≤ 11 mg kg–1 to evaluate P application strategies for...

Data from: Sorghum and groundnut sole and intercrop nutrient response in semi-arid West Africa

N. Maman, M. K. Dicko, A. Gonda, C. S. Wortmann, Idriss Serme, Korodjuma Ouattara & A Bandogo
Sorghum (Sorghum bicolor L. Moench)–groundnut (Arachis hypogaea L.) intercropping is important in the Sahel and Sudan Savanna. Nineteen trials were conducted during 2014 and 2015 in Mali and Niger for determination of: response functions for sorghum sole crop (SSC) and intercrop to N, P, and K; effects of the P×N interaction and of a nutrient package for diagnosis of other deficiencies; and a procedure for estimation of intercrop functions from SSC response functions. Six Niger...

Data from: Maize-nutrient response functions for Eastern and Southern Africa

Charles S. Wortmann, Catherine Senkoro, Athanase R. Cyamweshi, Catherine Kibunja, Davy Nkonde, Moses Munthali, Patson Nalivata, Léon N. Nabahungu, Kayuki Kaizzi & Charles Wortmann
Information is scarce for maize (Zea mays L.) response to nutrient application for many production areas in tropical Africa. Research was conducted to determine macronutrient response functions and to diagnose Mg–S–Zn–B deficiencies. Site–year × N-rate interactions within countries often accounted for little variation in yield relative to the N-rate effect. Country mean grain yield responses to N-rate were curvilinear to plateau, but linear in Malawi. Although mean yields differed, the response to N was similar...

Data from: Maize-nutrient response information applied across Sub-Saharan Africa

Charles S. Wortmann, Maribeth Milner, Kayuki C. Kaizzi, Maman Nouri, Athanase R. Cyamweshi, Mohammed K. Dicko, Catherine N. Kibunja, Martin Macharia, Ricardo Maria, Patson C. Nalivata, Negash Demissie, Davy Nkonde, Korodjouma Ouattara, Catherine J. Senkoro, Bitrus Dawi Tarfa & Francis M. Tetteh
The profit potential for a given investment in fertilizer use can be estimated using representative crop nutrient response functions. Where response data is scarce, determination of representative response functions can be strengthened by using results from homologous crop growing conditions. Maize (Zea mays L.) nutrient response functions were selected from the Optimization of Fertilizer Recommendations in Africa (OFRA) database of 5500 georeferenced response functions determined from field research conducted in Sub-Saharan Africa. Three methods for...

Data from: Lake regionalization and diatom metacommunity structuring in tropical South America

Xavier Benito, Sherilyn C. Fritz, Miriam Steinitz-Kannan, Maria I. Vélez & Michael M. McGlue
Lakes and their topological distribution across Earth’s surface impose ecological and evolutionary constraints on aquatic metacommunities. In this study, we group similar lake ecosystems as metacommunity units influencing diatom community structure. We assembled a database of 195 lakes from the tropical Andes and adjacent lowlands (8ºN–30ºS and 58–79ºW) with associated environmental predictors to examine diatom metacommunity patterns at two different levels: taxon and functional (deconstructed species matrix by ecological guilds). We also derived spatial variables...

Data from: Modeled and measured ecosystem respiration in maize–soybean systems over 10 years

Ming Zhan, Adam J. Liska, Anthony L. Nguy-Robertson, Andrew E. Suyker, Matthew P. Pelton & Haishun Yang
Crop residue is an abundant resource for the potential production of biofuels, but a better understanding of its use on net carbon emissions must be developed to mitigate climate change. This analysis combines two established crop growth models (Hybrid-Maize and Soysim) with a simple soil and crop residue respiration model to estimate daily ecosystem respiration (ERe) from maize and soybean; ERe was estimated to be the sum of CO2 emissions from the oxidation of the...

Trophic cascades alter eco-evolutionary dynamics and body size evolution

Thomas Luhring & John DeLong
Trait evolution in predator-prey systems can feed back to the dynamics of interacting species as well as cascade to impact the dynamics of indirectly linked species (eco-evolutionary trophic cascades; EETC). A key mediator of trophic cascades is body mass, as it both strongly influences and evolves in response to predator-prey interactions. Here we use Gillespie Eco-Evolutionary Models to explore EETCs resulting from top predator loss and mediated by body mass evolution. Our four trophic level...

Using patterns in prey DNA digestion rates to quantify predator diets

Stella Uiterwaal & John DeLong
Dietary metabarcoding – the process of taxonomic identification of food species from DNA in consumer guts or feces – has been rapidly adopted by ecologists to gain insights into biocontrol, invasive species, and the structure of food webs. However, an outstanding issue with metabarcoding is the semi-quantitative nature of the data it provides: because metabarcoding is likely to produce false positives for some prey more often than for other prey, we cannot infer relative frequencies...

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...

Pea aphid winged and wingless males exhibit reproductive, gene expression, and lipid metabolism differences

Omid Saleh Ziabari, Qingyi Zhong, Swapna Purandare, Joel Reiter, Anthony Zera & Jennifer Brisson
Alternative, intraspecific phenotypes offer an opportunity to identify the mechanistic basis of differences associated with distinctive life-history strategies. Wing dimorphic insects, in which both flight-capable and flight-incapable individuals occur in the same population, are particularly well-studied in terms of why and how the morphs trade-off flight for reproduction. Yet despite a wealth of studies examining the differences between female morphs, little is known about male differences, which could arise from different causes than those acting...

A comparative phylogenomic analysis of birds reveals heterogeneous differentiation processes among Neotropical Savannas

Cássia Alves Lima-Rezende, Gustavo S. Cabanne, Amanda Vaz Rocha, Martin Carboni, Robert M. Zink & Renato Caparroz
The main objective of this study is to evaluate biogeographic hypotheses of diversification and connection between isolated savannas north (Amazonian savannas) and south (Cerrado core) of the Amazon River. To achieve our goal, we employed genomic markers (genotyping by sequencing) to evaluate the genetic structure, population phylogenetic relationships, and historical range shifts of four Neotropical passerines with peri-Atlantic distributions: the Narrow-billed Woodcreeper (Lepidocolaptes angustirostris), the Plain-crested Elaenia (Elaenia cristata), the Grassland Sparrow (Ammodramus humeralis), and...

Data from: Puma responses to unreliable human cues suggest an ecological trap in a fragmented landscape

Anna Nisi, John Benson & Christopher C. Wilmers
Animals’ fear of people is widespread across taxa and can mitigate the risk of human-induced mortality, facilitating coexistence in human-dominated landscapes. However, humans can be unpredictable predators and anthropogenic cues that animals perceive may not be reliable indicators of the risk of being killed. In these cases, animal fear responses may be ineffective and may even exacerbate the risk of anthropogenic mortality. Here, we explore these questions using a 10-year dataset of movement and mortality...

Data from: Increased signal complexity is associated with increased mating success

Noori Choi, Matt Adams, Kasey Fowler-Finn, Elise Knowlton, Malcolm Rosenthal, Aaron Rundus, Roger Santer, Dustin Wilgers & Eileen Hebets
The evolution of complex signaling has often been explored by testing multiple functional hypotheses that vary in their underlying assumptions about how independent signal components provide selective benefits to offset the costs of their production. In the present study, we take a different approach to exploring the function of complexity per se. We test the hypothesis that increased vibratory signal complexity – based on both proportional and temporal patterning - provides selective benefits to courting...

An ordinal severity scale for COVID-19 retrospective studies using electronic health record data

Maryam Khodaverdi, Bradley Price, Zachary Porterfield, Timothy Bunnell, Michael Vest, Jerrod Anzalone, Jeremy Harper, Wes Kimble, Hamidreza Moradi, Brian Hendricks, Susan Santangelo & Sally Hodder
Objectives: Although the World Health Organization (WHO) Clinical Progression Scale for COVID-19 is useful in prospective clinical trials, it cannot be effectively used with retrospective Electronic Health Record (EHR) datasets. Modifying the existing WHO Clinical Progression Scale, we developed an ordinal severity scale (OS) and assessed its usefulness in the analyses of COVID-19 patient outcomes using retrospective EHR data. Results: The data set used in this analysis consists of 2,880,456 patients. PCA of the day-to-day...

Data from: Competition for hummingbird pollination shapes flower color variation in Andean Solanaceae

Nathan Muchhala, Sönke Johnsen & Stacey Dewitt Smith
One classic explanation for the remarkable diversity of flower colors across angiosperms involves evolutionary shifts among different types of pollinators with different color preferences. However, the pollinator shift model fails to account for the many examples of color variation within clades that share the same pollination system. An alternate explanation is the competition model, which suggests that color divergence evolves in response to interspecific competition for pollinators, as a means to decrease interspecific pollinator movements....

Data from: Simultaneous delimitation of species and quantification of interspecific hybridization in Amazonian peacock cichlids (genus Cichla) using multi-locus data

Stuart C. Willis, Jason Macrander, Izeni P. Farias & Guillermo Orti
BACKGROUND: Introgression likely plays a significant role in evolution, but understanding the extent and consequences of this process requires a clear identification of species boundaries in each focal group. The delimitation of species, however, is a contentious endeavor. This is true not only because of the inadequacy of current tools to identify species lineages, but also because of the inherent ambiguity between natural populations and species paradigms. The result has been a debate about the...

Data from: Spatial and temporal unpredictability of colony size in cliff swallows across 30 years

Charles R. Brown, Mary Bomberger Brown & Erin A. Roche
Most colonially breeding animals occupy colonies that range in size from a few pairs to thousands of individuals, but the causes of colony size variation are largely unknown. Three general hypotheses are: (1) that variation in colony size is maintained by fluctuating selection via spatial and temporal changes in fitness associated with different colony sizes; (2) that colony formation reflects heterogeneity in habitat, with some sites having resources to support more individuals than others; and...

Data from: Prediction of genetic values of quantitative traits with epistatic effects in plant breeding populations

Dong Wang, Ibrahim El-Basyoni, P. S. Baenziger, Jose Crossa, Kent Eskridge & I. Dweikat
Though epistasis has long been postulated to play a critical role in genetic regulation of important pathways as well as provide a major source of variation in the process of speciation, the importance of epistasis for genomic selection in the context of plant breeding is still being debated. In this paper, we report the results on the prediction of genetic values with epistatic effects for 280 accessions in the Nebraska Wheat Breeding Program using adaptive...

Data from: Nutrient regulation strategies differ between cricket morphs that trade-off dispersal and reproduction

Rebecca M. Clark, Ashley McConnell, Anthony J. Zera & Spencer T. Behmer
1. Nutrient regulation should covary with life history, but actual demonstrations of this connection are rare. 2. Here we use a wing-polymorphic cricket, Gryllus firmus, that trades-off dispersal and reproduction; the long-winged morph with functional flight muscles (LW(f)) is adapted for dispersal at the expense of egg production, while the short-winged (SW) morph is adapted for egg production at the expense of flight. We explore the extent to which these two morphs differentially regulate macronutrient...

Data from: Correction of location errors for presence-only species distribution models

Trevor J. Hefley, David M. Baasch, Andrew J. Tyre & Erin E. Blankenship
1. Species distribution models (SDMs) for presence-only data depend on accurate and precise measurements of geographic and environmental covariates that influence presence and abundance of the species. Some data sets, however, may contain both systematic and random errors in the recorded location of the species. Environmental covariates at the recorded location may differ from those at the true location and result in biased parameter estimates and predictions from SDMs. 2. Regression calibration is a well-developed...

Data from: Research design considerations to ensure detection of all species in an avian community

Maggi Sliwinski, Larkin Powell, Nicola Koper, Matthew Giovanni & Walter Schacht
1.Recent advances in the estimation of species richness from count data have allowed avian ecologists to incorporate incomplete detectability of species when comparing richness across space or time. Raw counts from single or repeated visits to sample point(s) are nonetheless still used for assessing community composition, and the failure to account for detectability when making these evaluations may lead to incorrect inferences about the community. 2.We estimated detection probabilities (p) for a suite of bird...

Data from: Social network structure in wintering golden-crowned sparrows is not correlated with kinship

Nina N. Arnberg, Bruce E. Lyon, Daizaburo Shizuka & Alexis S. Chaine
Stable social organization in a wide variety of organisms has been linked to kinship, which can minimize conflict due to the indirect fitness benefits from cooperating with relatives. In birds, kin selection has been mostly studied in the context of reproduction or in species that are social year round. Many birds however are migratory, and the role of kinship in the winter societies of these species is virtually unexplored. In a previous study, we discovered...

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  • University of Nebraska - Lincoln
  • University of Nebraska–Lincoln
  • University of Minnesota
  • University of California, Davis
  • Iowa State University
  • Cornell University
  • Michigan State University
  • Stanford University
  • Institut National de la Recherche Agronomique du Niger
  • Kenya Agricultural and Livestock Research Organization