87 Works

Data from: Pleistocene diversification in an ancient lineage: a role for glacial cycles in the evolutionary history of Dioon Lindl. (Zamiaceae).

Brian L. Dorsey, Timothy J Gregory, Chodon Sass & Chelsea D. Specht
Premise of the study: Recent estimates of crown ages for cycad genera (Late Miocene) challenge us to consider what processes have produced the extant diversity of this ancient group in such relatively little time. Pleistocene climate change has driven major shifts in species distributions in Mexico and may have led to speciation in the genus Dioon by forcing populations to migrate up in elevation thereby becoming separated by topography. Methods: We inferred orthologs from transcriptomes...

Data from: Genome-wide association and genomic prediction models of tocochromanols in fresh sweet corn kernels

Matheus Baseggio, Matthew Murray, Maria Magallanes-Lundback, Nicholas Kaczmar, James Chamness, Edward Buckler, Margaret Smith, Dean DellaPenna, William Tracy, Michael Gore, Margaret E. Smith, Michael A. Gore, William F. Tracy & Edward S. Buckler
Sweet corn (Zea mays L.), a highly consumed fresh vegetable in the United States, varies for tocochromanol (tocopherol and tocotrienol) levels, but makes limited contribution to daily intake of vitamin E and antioxidants. We performed a genome-wide association study of six tocochromanol compounds and 14 derivative traits across a sweet corn inbred line association panel to identify genes associated with natural variation for tocochromanols and vitamin E in fresh kernels. Concordant with prior studies in...

Data from: The importance of growing up: juvenile environment influences dispersal of individuals and their neighbours

Stacy B. Endriss, Megan L. Vahsen, Ellyn V. Bitume, J. Grey Monroe, Kathryn G. Turner, Andrew P. Norton & Ruth A. Hufbauer
Dispersal is a key ecological process that is strongly influenced by both phenotype and environment. Here, we show that juvenile environment influences dispersal not only by shaping individual phenotypes, but also by changing the phenotypes of neighbouring conspecifics, which influence how individuals disperse. We used a model system (Tribolium castaneum, red flour beetles) to test how the past environment of dispersing individuals and their neighbours influences how they disperse in their current environment. We found...

Data from: Landscape context shifts the balance of costs and benefits from wildflower borders on multiple ecosystem services

Heather Grab, Katja Poveda, Bryan Danforth, Gregory Loeb & Greg Loeb
In the face of global biodiversity declines driven by agricultural intensification, local diversification practices are broadly promoted to support farmland biodiversity and multiple ecosystem services. The creation of flower rich habitats on farmland has been subsidized in both the US and EU to support biodiversity and promote delivery of ecosystem services. Yet, theory suggests that the landscape context in which local diversification strategies are implemented will influence their success. However, few studies have empirically evaluated...

Data from: Similar hybrid composition among different age and sex classes in the Myrtle–Audubon's warbler hybrid zone

David P. L. Toews, Irby J. Lovette, Darren E. Irwin & Alan Brelsford
Hybrid zones provide a key natural context within which to study the barriers between incipient species. In some avian hybrid zones, there is indirect evidence of selection against hybrid offspring, yet the source of that selection is often unclear. We examined the frequency distribution of hybrids between Myrtle Warblers (Setophaga coronata coronata) and Audubon's Warblers (S. c. auduboni), using data to quantify—for the first time at a genomic scale—the composition of hybrids in this hybrid...

Data from: Lifespan bias explains live-dead discordance in abundance of two common bivalves

Kelly E. Cronin, Gregory P. Dietl, Patricia H. Kelley & Stewart M. Edie
Lifespan bias potentially alters species abundance in death assemblages through the overrepresentation of short-lived organisms compared to their long-lived counterparts. Although previous work found that lifespan bias did not contribute significantly to live-dead discordance in bivalve assemblages, lifespan bias better explained discordance in two groups: longer-lived bivalve species and species with known lifespans. More studies using local, rather than global, species-wide, lifespans and mortality rates would help to determine the prevalence of lifespan bias, especially...

Data from: Genetic diversity of Persian Arabian horses and their relationship to other native Iranian horse breeds

Raheleh Sadeghi, Mohammad Moradi-Shahrbabak, Seyed Reza Miraei Ashtiani, Florencia Schlamp, Elissa J. Cosgrove & Doug F. Antczak
The principal aims of this study were to explore genetic diversity and genome-wide selection signatures in Persian Arabian horses and to determine genetic relationship of Persian Arabians with other Iranian horse breeds. We evaluated 71 horses from 8 matrilineal strains tracing to 47 mares from the mid to late 19th century, using the equine 670k SNP BeadChip. Mean observed and expected heterozygosity were (0.43) and (0.45), respectively, average inbreeding measures (FROH and FPED) were low,...

Data from: A wood-warbler produced through both interspecific and intergeneric hybridization

David P.L. Toews, Henry M. Streby, Lowell Burket, Scott A. Taylor & David P. L. Toews
Hybridization between divergent taxa can provide insight into the breakdown of characters used in mate choice, as well as reproductive compatibility across deep evolutionary timescales. Hybridization can also occur more frequently in declining populations, as there is a smaller pool of conspecific mates from which to choose. Here we report an unusual combination of factors that has resulted in a rare, three-species hybridization event amongst two genera of warblers, one of which is experiencing significant...

Data from: On again, off again: acute stress response and negative feedback together predict resilience to experimental challenges

Cedric Zimmer, Conor C. Taff, Daniel R. Ardia, Thomas A. Ryan, David W. Winkler & Maren N. Vitousek
1. Individuals often vary markedly in their ability to cope with stressors, but the drivers of this variation remain poorly understood. Many studies have tested relationships among individual variation in glucocorticoid levels and the response to challenges – often finding inconsistent patterns; however, few have addressed whether variation in the capacity to terminate the stress response through negative feedback is associated with stress resilience. 2. While conceptual models predict that interactions among different components of...

Data from: Narrow thermal tolerance and low dispersal drive higher speciation in tropical mountains

Nicholas R. Polato
Species richness is greatest in the tropics and much of this diversity is concentrated in mountains. Janzen (1967) proposed that reduced seasonal temperature variation selects for narrower thermal tolerances and limited dispersal along tropical elevation gradients. These locally adapted traits should, in turn, promote reproductive isolation and higher speciation rates in tropical mountains compared to temperate ones. Here we show that tropical and temperate montane stream insects have diverged in thermal tolerance and dispersal capacity,...

Data from: Globally invasive genotypes of the amphibian chytrid outcompete an enzootic lineage in coinfections

Thomas S. Jenkinson, David Rodriguez, Rebecca A. Clemons, Lucas A. Michelotti, Kelly R. Zamudio, Luís Felipe Toledo, Joyce E. Longcore & Timothy Y. James
Competition between genotypes is likely to be a key driver of pathogen evolution, particularly following a geographic invasion by distant strains. Theory predicts that competition between disease strains will result in the most virulent strain persisting. Despite its evolutionary implications, the role of strain competition in shaping populations remains untested for most pathogens. We experimentally investigated the in vivo competitive differences between two divergent lineages of the amphibian-killing chytrid fungus (Batrachochytrium dendrobatidis, Bd). These Bd...

Data from: Crop pests and predators exhibit inconsistent responses to surrounding landscape composition

Daniel S. Karp, Rebecca Chaplin-Kramer, Timothy D. Meehan, Emily A. Martin, Fabrice DeClerck, Heather Grab, Claudio Gratton, Lauren Hunt, Ashley E. Larsen, Alejandra Martínez-Salinas, Megan E. O’Rourke, Adrien Rusch, Katja Poveda, Mattias Jonsson, Jay A. Rosenheim, Nancy A. Schellhorn, Teja Tscharntke, Stephen D. Wratten, Wei Zhang, Aaron L. Iverson, Lynn S. Adler, Matthias Albrecht, Audrey Alignier, Gina M. Angelella, Muhammad Zubair Anjum … & Yi Zou
The idea that noncrop habitat enhances pest control and represents a win–win opportunity to conserve biodiversity and bolster yields has emerged as an agroecological paradigm. However, while noncrop habitat in landscapes surrounding farms sometimes benefits pest predators, natural enemy responses remain heterogeneous across studies and effects on pests are inconclusive. The observed heterogeneity in species responses to noncrop habitat may be biological in origin or could result from variation in how habitat and biocontrol are...

Registration Year

  • 2018
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Affiliations

  • Cornell University
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  • University of California, Berkeley
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