96 Works

Student Affairs Practitioners’ Perceptions of the Career Development of Sorority Members

Kristin M. Walker & Pamela A. Havice

A Document Analysis of Anti-Hazing Policy

Christobal Salinas, Michelle Boettcher & Jennifer Plagman-Galvin

A Review of Program Evaluation in School Counseling: Improving Comprehensive and Developmental Programs

Amanda D. Rumsey

Data from: Geographic variation in pollen color is associated with temperature stress

Laura Galloway & Matthew Koski
The evolution of flower color, especially petal pigmentation, has received substantial attention. Less understood is the evolutionary ecology of pollen pigmentation though it varies among and within species and its biochemical properties affect pollen viability. We characterize the distribution of pollen color across 24 populations of the North American herb Campanula americana, and assess the degree to which this variation is genetically based. We identify abiotic factors that covary with pollen color and test whether...

Pollen color morphs take different paths to fitness

Matthew Koski, Andrea Berardi & Laura Galloway
Color phenotypes are often involved in communication and are thus under selection by species interactions. However, selection may also act on color through correlated traits or alternative functions of biochemical pigments. Such forms of selection are instrumental in maintaining petal color diversity in plants. Pollen color also varies markedly, but the maintenance of this variation is little understood. In Campanula americana, pollen ranges from white to dark purple, with darker morphs garnering more pollinator visits...

Influences of patch-burn grazing on headwater prairie streams and subsequent recovery

Jessica Fulgoni, Matt Whiles, Walter Dodds, Danelle Larson, Karen Jackson & Bartosz Grudzinski
1. Patch-burn grazing (PBG) can promote terrestrial heterogeneity and biodiversity, but can temporarily increase stream nutrients, ecosystem metabolism, and alter macroinvertebrate assemblages. The impacts of grazing on stream channel morphology and post-PBG recovery patterns are unclear. 2. We assessed the influence of grazing in PBG managed grassland streams in Missouri, USA, and subsequent recovery when grazing ceased for two years. We hypothesized that grazing would degrade water quality, stream biotic integrity, and channel morphology, but...

Macroevolution of flower color patterning: biased transition rates and correlated evolution with flower size

Matthew Koski
Floral pigmentation patterns can both mediate plant-pollinator interactions and modify the abiotic environment of reproductive structures. To date there have been no inquiries into the rate and directionality of macroevolutionary transitions between patterned and non-patterned petals despite their ecological importance and ubiquity across angiosperms. Petals in the Potentilleae tribe (Rosaceae) display color patterns in the ultraviolet (UV) and human-visible spectrum, or can be uniform in color (i.e., patternless). Using a phylogeny of Potentilleae, I test...

Data from: Comparative knowledge, attitudes, and practices regarding anthrax, brucellosis, and rabies in three districts of northern Tanzania

Christian Kiffner, Michelle Latzer, Ruby Vise, Hayley Benson, Elizabeth Hammon & John Kioko
Background Knowledge, attitudes, and practices (KAP) surveys regarding zoonotic diseases are crucial to understanding the extent of knowledge among citizens and for guiding health-related education programs. Method Employing a structured questionnaire, we interviewed residents (n=388) in three districts of northern Tanzania (Karatu n=128, Monduli n=114, Babati n=146) to assess knowledge, attitudes and reported practices regarding three zoonotic diseases that occur in the region (anthrax, brucellosis, and rabies). We used generalized linear mixed effects models and...

Empirical evidence of different egg morphs that match host eggs in the brush cuckoo (Cacomantis variolosus)

Virginia Abernathy & Wei Liang
One of the most efficient defences against obligate brood parasitism in birds is egg ejection, where a host recognises and removes the parasitic egg from the nest. This defence often selects for egg mimicry in parasitic species to reduce the likelihood of egg ejection. If a parasite uses multiple host species with distinctive egg types, this could lead to the evolution of egg gentes (host-specific egg types) in the parasite. There is observational evidence that...

Climate-related geographic variation in performance traits across the invasion front of a widespread nonnative insect

Lily Thompson, Sean Powers, Ashley Appolon, Petra Hafker, Lelia Milner, Dylan Parry, Salvatore Agosta & Kristine Grayson
Aim: Invasive species are an ideal system for testing geographic differences in performance traits and measuring evolutionary responses as a species spreads across divergent climates and habitats. The European gypsy moth, Lymantria dispar dispar L. (Lepidoptera: Erebidae), is a generalist forest defoliator introduced to Medford, Massachusetts, USA in 1869. Currently, the invasion front extends from Minnesota to North Carolina and the ability of gypsy moth populations to adapt to local climate may contribute to its...

The complex history of genome duplication and hybridization in North American gray treefrogs

William W. Booker, H. Carl Gerhardt, Alan R. Lemmon, Margaret Ptacek, Alyssa T. B. Hassinger, Johannes Schul & Emily M. Lemmon
Polyploid speciation has played an important role in evolutionary history across the tree of life, yet there remain large gaps in our understanding of how polyploid species form and persist. While systematic studies have been conducted in numerous polyploid complexes, recent advances in sequencing technology have demonstrated that conclusions from data-limited studies may be spurious and misleading. The North American gray treefrog complex, consisting of the diploid Hyla chrysoscelis and the tetraploid Hyla versicolor, has...

Soil biogeochemistry across Central and South American tropical dry forests

Bonnie Waring, Mark De Guzman, Dan Du, Juan Dupuy, Maga Gei, Jessica Gutknecht, Catherine Hulshof, Nicolas Jelinski, Andrew Margenot, David Medvigy, Camila Pizano, Beatriz Salgado-Negret, Naomi Schwartz, Annette Trierweiler, Skip Van Bloem, German Vargas G & Jennifer Powers
The availability of nitrogen (N) and phosphorus (P) controls the flow of carbon (C) among plants, soils, and the atmosphere, thereby shaping terrestrial ecosystem responses to global change. Soil C, N, and P cycles are linked by drivers operating at multiple spatial and temporal scales: landscape-level variation in macroclimate, seasonality, and soil geochemistry; stand-scale heterogeneity in forest composition and structure; and microbial community dynamics at the soil pore scale. Yet in many biomes, we do...

Data from: Comparative limb bone loading in the humerus and femur of the tiger salamander: testing the ‘mixed-chain’ hypothesis for skeletal safety factors

Sandy M. Kawano, D. Ross Economy, Marian S. Kennedy, Delphine Dean & Richard W. Blob
Locomotion imposes some of the highest loads upon the skeleton, and diverse bone designs have evolved to withstand these demands. Excessive loads can fatally injure organisms; however, bones have a margin of extra protection, called a ‘safety factor’ (SF), to accommodate loads that are higher than normal. The extent to which SFs might vary amongst an animal's limb bones is unclear. If the limbs are likened to a chain composed of bones as ‘links’, then...

Data from: Genome-environment associations in sorghum landraces predict adaptive traits

Jesse R. Lasky, Hari D. Upadhyaya, Punna Ramu, Santosh Deshpande, C. Tom Hash, Jason Bonnette, Thomas E. Juenger, Katie Hyma, Charlotte Acharya, Sharon E. Mitchell, Edward S. Buckler, Zachary Brenton, Stephen Kresovich & Geoffrey P. Morris
Improving environmental adaptation in crops is essential for food security under global change, but phenotyping adaptive traits remains a major bottleneck. If associations between single-nucleotide polymorphism (SNP) alleles and environment of origin in crop landraces reflect adaptation, then these could be used to predict phenotypic variation for adaptive traits. We tested this proposition in the global food crop Sorghum bicolor, characterizing 1943 georeferenced landraces at 404,627 SNPs and quantifying allelic associations with bioclimatic and soil...

Data from: Integrating molecular, phenotypic and environmental data to elucidate patterns of crocodile hybridization in Belize

Evon R. Hekkala, Steven G. Platt, John B. Thorbjarnarson, Thomas R. Rainwater, Michael Tessler, Seth W. Cunningham, Christopher Twomey & George Amato
The genus Crocodylus comprises 12 currently recognized species, many of which can be difficult to differentiate phenotypically. Interspecific hybridization among crocodiles is known to occur in captivity and has been documented between some species in the wild. The identification of hybrid individuals is of importance for management and monitoring of crocodilians, many of which are Convention on International Trade in Endangered Species (CITES) listed. In this study, both mitochondrial and nuclear DNA markers were evaluated...

Data from: Legume abundance along successional and rainfall gradients in neotropical forests

Maga Gei, Danaë M. A. Rozendaal, Lourens Poorter, Frans Bongers, Janet I. Sprent, Mira D. Garner, T. Mitchell Aide, José Luis Andrade, Patricia Balvanera, Justin M. Becknell, Pedro H.S. Brancalion, George A. L. Cabral, Ricardo Gomes César, Robin L. Chazdon, Rebecca J. Cole, Gabriel Dalla Colletta, Ben De Jong, Julie S. Denslow, Daisy H. Dent, Saara J. DeWalt, Juan Manuel Dupuy, Sandra M. Durán, Mário Marcos Do Espírito Santo, G. Wilson Fernandes, Yule Roberta Ferreira Nunes … & Jennifer S. Powers
The nutrient demands of regrowing tropical forests are partly satisfied by nitrogen (N)-fixing legume trees, but our understanding of the abundance of those species is biased towards wet tropical regions. Here we show how the abundance of Leguminosae is affected by both recovery from disturbance and large-scale rainfall gradients through a synthesis of forest-inventory plots from a network of 42 Neotropical forest chronosequences. During the first three decades of natural forest regeneration, legume basal area...

Data from: Arsenic induces members of the mmu-miR-466-669 cluster which reduces NeuroD1 expression

Jui-Tung Liu & Lisa J. Bain
Chronic arsenic exposure can result in adverse development effects including decreased intellectual function, reduced birth weight, and altered locomotor activity. Previous in vitro studies have shown that arsenic inhibits stem cell differentiation. MicroRNAs (miRNAs) are small non-coding RNAs that regulate multiple cellular processes including embryonic development and cell differentiation. The purpose of this study was to examine whether altered miRNA expression was a mechanism by which arsenic inhibited cellular differentiation. The pluripotent P19 mouse embryonal...

Resolving higher-level phylogenetic networks with repeated hybridization in a complex of polytypic salamanders (Plethodontidae: Desmognathus)

Robert Pyron, Kyle O'Connell, Hector Banos, Edward Myers & David Beamer
Repeated hybridization between newly forming lineages is a common feature of ecological speciation and ecomorphological diversification. However, computational constraints currently limit our ability to reconstruct network radiations from gene-tree data. Available methods are limited to level-1 networks wherein reticulations do not share edges, and higher-level networks may be non-identifiable in many cases. We present a heuristic method for recovering information from higher-level networks across a range of potentially identifiable empirical scenarios, supported by a theorem...

Data from: Coyote diet in North America: geographic and ecological patterns during range expansion

Alex Jensen, Courtney Marneweck, John Kilgo & David Jachowski
This dataset was used to review and analyze coyote diets across North America in "Coyote diets in North America: geographic and ecological patterns during range expansion" by Jensen et al. in Mammal Review. We only include data from studies that reported data as percent frequency of occurrence and from multiple seasons. We ultimately used 93 of the included studies (294 seasonal records) in our analyses.

Shade and Fertilizer Affects Yield and Quality in a Clonal Plantation of Yaupon Holly

Jeffrey Adelberg, Cory Tanner, Rabia El-hawaz & Nishanth Tharayil
Yaupon holly (Ilex vomitoria Ait.) is the only native American source of caffeinated tea and the small amounts of tea product that is available is currently wild-collected from diverse populations. A clonal field plantation of yaupon was grown under shading and fertilizer treatments and harvested three times in one season to observe changes in yield and phytochemistry. The June and September harvest produced more mass than the July harvest for all treatments. Shading and fertility...

Data from: Differential impacts of nitrogen addition on rhizosphere and bulk-soil carbon sequestration in an alpine shrubland

Xiaomin Zhu, Ziliang Zhang, Dongyan Liu, Yongping Kou, Qian Zheng, Mei Liu, Juan Xiao, Qing Liu & Huajun Yin
1. Due to complex root-soil interactions, the responses of carbon (C) dynamics in the rhizosphere to elevated nitrogen (N) deposition may be different from those in bulk soil. However, the potentially different response of C dynamics in the rhizosphere and bulk soils and their contributions to soil C sequestration under N deposition is still not elucidated. 2. We conducted an N addition experiment in an alpine shrubland dominated by Sibiraea angustata located on the eastern...

Rapid and predictable evolution of admixed populations between two Drosophila species pairs

Daniel Matute, Aaron Comeault, Eric Earley, Antonio Serrato-Capuchina, David Peede, Anaïs Monroy-Eklund, Wen Huang, Corbin Jones, Trudy Mackay & Jerry Coyne
The consequences of hybridization are varied, ranging from the origin of new lineages, introgression of some genes between species, to the extinction of one of the hybridizing species. We generated replicate admixed populations between two pairs of sister species of Drosophila: D. simulans and D. mauritiana; and D. yakuba and D. santomea. Each pair consisted of a continental species and an island endemic. The admixed populations were maintained by random mating in discrete generations for...

Data from: Elevational divergence in pigmentation plasticity is associated with selection and pigment biochemistry

Matthew Koski
Phenotypic plasticity is predicted to evolve in environmentally variable habitats, or those experiencing a high frequency of strong selection. However, the evolution of plasticity may be constrained by costs or physiological constraints. In flowers, UV-absorbing pigmentation ameliorates UV damage to pollen, and is linked with elevated UV exposure. Whether plasticity contributes to this pattern remains unclear. Petals of Argentina anserina have larger UV-absorbing petal areas at high elevations where they experience higher and more variable...

Data from: Corn stover removal responses on soil test P and K levels in Coastal Plain Ultisols

Jeffrey Novak, James Frederick, Donald Watts, Thomas Ducey & Douglas Karlen
This is digital research data corresponding to a published manuscript, Corn stover removal responses on soil test P and K levels in Coastal Plain Ultisols, in Sustainability. 2021. 13:4401. Corn (Zea mays L.) stover is used as a biofuel feedstock in the U.S. Selection of stover harvest rates for soils is problematic, however, because excessive stover removal may have consequences on plant available phosphorus (P) and potassium (K) concentrations. Our objective was to quantify stover...

Litter decomposition and nutrient release from monospecific and mixed litters: comparisons of litter quality, fauna and decomposition sites effects

Kai Yang, Jiaojun Zhu, Weiwei Zhang, Qian Zhang, Deliang Lu, Yakun Zhang, Xiao Zheng, Shuang Xu & G. Geoff Wang
Litter decomposition and nutrient release are key processes for soil C and nutrient cycling. However, the relative importance of the effects of litter quality, fauna and decomposition sites on litter decomposition remains poorly understood. Moreover, the macronutrient and micronutrient (C, N, P, K, Ca, Mg, Mn, Cu and Zn) release in the decomposition process are even less well-known. In this study, we performed 5040 litterbag samplings of monospecific (Larix gmelinii, Acer mono, Quercus mongolica, and...

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  • Clemson University
  • University of California, Davis
  • University of Virginia
  • University of Georgia
  • United States Department of Agriculture
  • University of Massachusetts Amherst
  • Columbia University
  • University of California, Berkeley
  • Agricultural Research Service
  • Chinese Academy of Sciences