8 Works

Data from: Effects of gene flow on phenotype matching between two varieties of Joshua tree (Yucca brevifolia; Agavaceae) and their pollinators

Jeremy B. Yoder, Christopher I. Smith, Daniel J. Rowley, Ramona Flatz, William Godsoe, Christopher Drummond & Olle Pellmyr
In animal-pollinated plants, local adaptation to pollinator behaviour or morphology can restrict gene flow among plant populations; but gene flow may also prevent divergent adaptation. Here, we examine possible effects of gene flow on plant-pollinator trait matching in two varieties of Joshua tree (Agavaceae: Yucca brevifolia). The two varieties differ in strikingly in floral morphology, which matches differences in the morphology of their pollinators. However, this co-divergence is not present at a smaller scale: within...

Data from: Thixotropy and rheopexy of muscle fibers probed using sinusoidal oscillations

David Altman, Fabio C. Minozzo & Dilson E. Rassier
Length changes of muscle fibers have previously been shown to result in a temporary reduction in fiber stiffness that is referred to as thixotropy. Understanding the mechanism of this thixotropy is important to our understanding of muscle function since there are many instances in which muscle is subjected to repeated patterns of lengthening and shortening. By applying sinusoidal length changes to one end of single permeabilized muscle fibers and measuring the force response at the...

Data from: Divergence in an obligate mutualism is not explained by divergent climatic factors

William Godsoe, Eva Strand, Christopher Irwin Smith, Jeremy B. Yoder, Todd C. Esque & Olle Pellmyr
Adaptation to divergent environments creates and maintains biological diversity, but we know little about the importance of different agents of ecological divergence. Coevolution in obligate mutualisms has been hypothesized to drive divergence, but this contention has rarely been tested against alternative ecological explanations. Here, we use a well-established example of coevolution in an obligate pollination mutualism, Yucca brevifolia and its two pollinating yucca moths, to test the hypothesis that divergence in this system is the...

Data from: Unsaturated zone CO2, CH4, and δ13C-CO2 at an arid region low-level radioactive waste disposal site

Christopher H. Conaway, Michelle A. Walvoord, Randal B. Thomas, Christopher T. Green, Ronald J. Baker, James J. Thordsen, David A. Stonestrom, Brian J. Andraski, C.H. Conaway, M.A. Walvoord, C.T. Green, R.J. Baker, J.J. Thordsen, D.A. Stonestrom, B.J. Andraski & R.B. Thomas
Elevated tritium, radiocarbon, Hg, and volatile organic compounds associated with low-level radioactive waste (LLRW) at the USGS Amargosa Desert Research Site (ADRS) have stimulated research on factors and processes that affect contaminant gas distribution and transport. Consequently, we examined the sources, mixing, and biogeochemistry of CO2 and CH4, two additional important species in the unsaturated zone at ADRS. In spring 2015 and 2016, shallow unsaturated zone gas samples were collected from the 1.5-m depth both...

Data from: Pollination on the dark side: acoustic monitoring reveals impacts of a total solar eclipse on flight behavior and activity schedule of foraging bees

Candace Galen, Zachary Miller, Austin Lynn, Michael Axe, Samuel Holden, Levi Storks, Edward Ramirez, Emilia Asante, David Heise, Susan Kephart, James Kephart, Eddie Ramirez & Jim Kephart
The total solar eclipse of 21 August 2017 traversed ~5000 km from coast to coast of North America. In its 90-min span, sunlight dropped by three orders of magnitude and temperature by 10–15°C. To investigate impacts of these changes on bee (Hymenoptera: Apoidea) pollinators, we monitored their flights acoustically in natural habitats of Pacific Coast, Rocky Mountain, and Midwest regions. Temperature changes during the eclipse had little impact on bee activity. Most of the explained...

Data from: Population genomics of divergence within an obligate pollination mutualism: selection maintains differences between Joshua tree species

Anne M. Royer, Matthew A. Streisfeld & Christopher Irwin Smith
PREMISE OF THE STUDY: Speciation is a complex process that can be shaped by many factors, from geographic isolation to interspecific interactions. In Joshua trees, selection from pollinators on style length has been hypothesized to contribute to the maintenance of differentiation between two hybridizing sister species. We used population genomics approaches to measure the extent of genetic differentiation between these species, test whether selection maintains differences between them, and determine whether genetic variants associated with...

Data from: Asymmetric hybridization and gene flow between Joshua trees (Agavaceae: Yucca) reflects differences in pollinator host specificity.

Tyler N. Starr, Katherine E. Gadek, Jeremy B. Yoder, Ramona Flatz & Christopher Irwin Smith
The angiosperms are by far the largest group of terrestrial plants. Their spectacular diversity is often attributed to specialized pollination. Obligate pollination mutualisms where both a plant and its pollinator are dependent upon one another for reproduction are thought to be prone to rapid diversification through co-evolution and pollinator isolation. However, few studies have evaluated the degree to which pollinators actually mediate reproductive isolation in these systems. Here, we examine evidence for hybridization and gene...

Data from: Street lighting: sex-independent impacts on moth movement

Tobias Degen, Oliver Mitesser, Elizabeth K. Perkin, Nina-Sophie Weiß, Martin Oehlert, Emily Mattig & Franz Hölker
1.Artificial lights have become an integral and welcome part of our urban and peri-urban environments. However, recent research has highlighted the potentially negative ecological consequences of ubiquitous artificial light. In particular, insects, especially moths, are expected to be negatively impacted by the presence of artificial lights. Previous research with light traps has shown a male-biased attraction to light in moths. 2.In this study, we sought to determine if street lights could limit moth dispersal and...

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