Entries by danatwater

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New Paper in ‘Invasive Plant Science and Management’

Competition and propagule density affect sexual and clonal propagation of a weed. Atwater, Kim, Tekiela, Barney   This study was pioneered by Wonjae Kim, an undergraduate student at Virginia Tech who designed and executed it on a grant from the Fralin Life Sciences Institute. Wonjae confirmed that Johnsongrass establishes readily both from seed and from buried […]


New Paper in ‘Biological Invasions’

Ecotypic diversity of a dominant grassland species resists exotic invasion Yang, Callaway, Atwater In this study, Lixue Yang showed that bluebunch wheatgrass (Pseudorogneria spicata) populations with greater within species diversity were pound-for-pound more resistant to invasion by spotted knapweed (Centaurea stoebe) than populations with less species diversity, by an order of magnitude. Dr. Yang attributed this […]


New Paper in ‘Journal of Plant Ecology’

Evidence for fine-scale habitat specialization in an invasive weed Atwater, Fletcher, Dickinson, Paterson, Barney (pdf) In previous studies, we found evidence for striking genetic and phenotypic differentiation in Johnsongrass (Sorghum halepense) populations collected throughout the United States. Here, we report that Johnsongrass may be adapting to local habitat variation. Johnsongrass from non-agricultural populations competed better in […]


New Paper in ‘PLoS One’

Multi-phase US spread and habitat switching of a post-Columbian invasive, Sorghum halepense Sezen, Barney, Atwater, Pederson, Pederson, Chandler, Cox, Cox, Dotray, Kopec, Smith, Schroeder, Wright, Jiao, Kong, Goff, Auckland, Rainville, Pierce, Compton, Lemke, Philips, Kerr, Mettler, Paterson (pdf) I’m happy to announce that PLoS One has accepted Uzay Sezen’s paper documenting the population genetics of colonizing Johnsongrass (Sorghum […]


New Paper in ‘Annual Reviews’

The mechanisms and consequences of interspecific interactions among plants Aschehoug, Brooker, Atwater, Maron & Callaway (pdf) I’m very pleased to announce that Annual Reviews of Ecology, Evolution and Systematics has accepted our review article documenting recent advances in our understanding of interspecific plant interactions. I am proud to have been a part of this group. […]


New Paper in ‘Ecology’

Intraspecific diversity buffers the inhibitory effects of soil biota Luo, Callaway & Atwater (link)(pdf) Congratulations to Wenbo Luo for recently having a paper accepted to Ecology! In this paper, Wenbo shows that soil microbes inhibit the growth of related bluebunch wheatgrass plants (Pseudoroegneria spicata). To do this, he collected soil from bluebunch populations varying in their […]

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WSSA 2016 – San Juan

I presented the results of my environmental niche modeling work at the 2016 Weed Science Society of America Meeting in San Juan, Puerto Rico. I attended the meeting with my advisor, Jacob Barney, and Dan Tekiela, a graduate student in Jacob’s lab. The weather was lovely and we had an excellent time escaping winter’s grip to […]

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New Paper in ‘Oecologia’

An exotic invasive plant selects for increased competitive tolerance, but not competitive suppression, in a native grass Fletcher, Callaway & Atwater (pdf) Many congratulations to Rebecca Fletcher, who just had a paper accepted into Oecologia. Her paper shows that spotted knapweed, an invasive plant, selects for bluebunch wheatgrass plants that are tolerant of knapweed competition, but not […]

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New Paper in ‘Weed Research’

Propagule pressure alone cannot always overcome biotic resistance: The role of density-dependent establishment in four invasive species Barney, Ho & Atwater (link) I am very pleased to announce that we have just had a paper accepted for publication into Weed Research. This paper documents Master’s Student Matt Ho’s research into the role of propagule pressure in […]

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NEPPSC 2016 – Philadelphia

I recently presented the results of my niche modeling work at the 2016 Northeastern Plant Pest and Soils Conference in Philadelphia. I went the the conference along with most of the rest of my postdoc advisor’s (Jacob Barney’s) lab and we had a great time. I met a lot of people, including the First American, Benjamin […]