PLOS ONE’s Top 5 Videos of 2015 (So Far)

At the end of 2014, we highlighted some of our favorite research videos from that year. We’re only mid-way through 2015, but we already have a number of popular research videos that we’d like to share. Here are some of … Continue reading »

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Zoom-Enhance: Identifying Trends in Article-Level Metrics

In late December 2013, PLOS ONE published an article from UK-based Psychologists Rob Jenkins and Christie Kerr titled “Identifiable Images of Bystanders Extracted from Corneal Reflections”. Using high-resolution photography, Jenkins, from the University of York, and Kerr, from the University … Continue reading »

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At Year’s End: Staff Editors’ Favorite PLOS ONE Articles of 2014


2014 has been an exciting year for PLOS ONE. We saw the journal reach a milestone, publishing its 100,000th article. PLOS ONE also published thousands of new research articles this year, including some ground-breaking discoveries, as well as some unexpected … Continue reading »

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PLOS ONE’s Spookiest Images of 2014


As we take a look back at research articles published so far in PLOS ONE in 2014, we realize we have no shortage of images to terrify our readers, or at least sufficiently creep them out long enough to last through … Continue reading »

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“Low T” and Prescription Testosterone: Public Viewing of the Science Does Matter


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Not Just a Pretty Face: Island Poppies Defend With Prickles

PoppyAlthough the vibrant, waifish petals of the poppy may appear inviting to the casual observer, a closer look reveals a pricklier message: Stay away! To discourage plant eaters like insects and birds from biting into their leafy appendages, many plant species protect themselves with defense mechanisms, like tougher leaves, distasteful latex, and armor made of prickles. Developing these defense features is part of a plant’s natural growth throughout its lifetime. Some plants, however, are able to activate additional protection when faced with attacking herbivores. The authors of a recent PLOS ONE paper investigated these defense mechanisms in two species of poppy currently found in Hawaii, where natural herbivores have long been extinct. The authors’ results reveal that island poppies may have more “nettle” in the face of simulated adversity than previously predicted.

The authors chose two species of poppy for testing, Argemone glauca, a species native to Hawaii, and Argemone mexicana, a species originally hailing from the North American continent and a recent inhabitant of the Hawaiian islands. Both species come pre-equipped with permanent features that may function as defense strategies. However, permanent defenses are costly to maintain for a plant: They divert energy away from other functions, like reproduction and growth, and are therefore an energy investment for the plant. To combat the cost of maintaining a full suite of permanent defenses, some plants respond to attacks from plant eaters only when they occur by activating additional defenses, known as inducible defenses. Unlike defense features that develop throughout the course of a plant’s lifetime, also known as constitutive defenses, inducible defenses are not permanent, only prompted by specific need.

In this study, the researchers simulated the need for additional defenses by subjecting the two species to various “attacks” to see how the poppies would respond. Plants were assigned to one of four random treatment groups:

  1. The control group, which received no treatment
  2. The damage group, where the authors clipped off portions of the leaves
  3. The Jasmonic acid group, where researchers sprayed the leaves with a harmful solution that inhibits growth
  4. And the combination group, where authors defoliated plants first and then sprayed them with Jasmonic acid

The researchers then allowed for two new leaves to grow to ensure that the plants had an adequate amount of time to respond.

Although neither species developed additional leaf toughness or produced more natural latex in response to treatments, both species exhibited increased prickle density on new leaves that grew after treatment. To evaluate prickle density, the authors harvested new leaves and counted all the new prickles on the surfaces of the leaves, excluding prickles found along the leaf edge. They also quantified the leaf area and performed statistical analyses to identify patterns in the various groups.

The authors found that Hawaiian native A. glauca responded more intensely to treatment by developing significantly more prickles than its continental North American counterpart, A. mexicana. The authors report that prickles for A. glauca were 20x more dense and 2.7x higher than A. mexicana.

Plant defenses are selected for over time due to snacking pressures from herbivores. On the Hawaii islands, however, natural herbivores of A. glauca, such as flightless ducks and beetles, are now extinct. The lack of natural predators for island plants has given rise to the idea that island plants have ‘gone soft’ over time. The authors consider A. glauca’s robust response to external attacks evidence that island plants may be better defended than previously thought.

Although it may be impossible to determine whether these island defenses have been selected for by herbivores of the past, no longer present, the inducibility of prickles in A. glauca and A. mexicana demonstrates that these poppies have the mettle to fight back against attackers and snackers.

For more on how herbivores and plants interact, check out this EveryONE blog post on snail mucus.

Citation: Hoan RP, Ormond RA, Barton KE (2014) Prickly Poppies Can Get Pricklier: Ontogenetic Patterns in the Induction of Physical Defense Traits. PLoS ONE 9(5): e96796. doi:10.1371/journal.pone.0096796

Image 1: Agemone glauca by Forest and Kim Starr

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PLOS ONE Publishes its 100,000th Article

PLOS ONE publishes its 100,000th article – a pretty major milestone for a journal that has seen its fair share of momentous events, and a perfect opportunity to reflect on this journey.

 PLOS ONE began seven and a half years ago. On the day of its launch – as has become the legend in the PLOS offices – there was an earthquake in the Bay Area, heralding the tremors that would be felt through the science world as a result of the disruptive innovation underway. PLOS ONE was an aspirational idea for PLOS from the very beginning: our founders always intended to launch a multi-disciplinary, broad-acceptance journal that would shake off the vestiges of the print tradition – no limits to the scope of research, number of pages, or potential growth.

And grow it did. After two years PLOS ONE had published over 4,000 articles, by four years it was the largest journal in the world, and now seven years after launch has published 100,000 articles. The revolutionary model of PLOS ONE has been emulated the world over: virtually every publisher now has its own equivalent “megajournal.”

PLOS ONE is now a major force in the scientific literature. The top 2% PLOS ONE papers (by number of views) have been collectively viewed nearly 39 million times, cited on Scopus over 80,000 times, bookmarked by Mendeley readers over 150,000 times, tweeted over 59,000 times, cited 2,800 times on Wikipedia, and recommended over 300 times on F1000 Prime.

The enduring value of PLOS ONE to the scientific process lies in the solid union between the three following factors: speed to publication, high standards of science, and unrestricted scope of research.

Speed to publication:

Faster time to publication was the founding principle of PLOS ONE. It doesn’t just entail going from submission to publication more quickly (although that is also important). It means dramatically reducing the time from an author’s decision to publish their findings to the time those results appear in public. That time is often years in the old system of review, where subjective opinions of significance and scope lead to unnecessary rejections and resubmission to different journals. With PLOS ONE, where scientific rigor alone is assessed, this time window shortens to a few months.

High standards:

PLOS ONE instituted rigorous standards from the start. As the volume exponentially increased and the quality of the submissions became more variable, these checks became more important and more rigorous. For every paper the journal staff (over 100 strong, including 14 editors) now check each of the following before a manuscript is sent for review:

  • Competing interests
  • Financial disclosures
  • Quality of English language
  • Ethical approval for animal experiments
  • IRB approval for human experiments
  • Protocols and CONSORT for clinical trials
  • PRISMA for systematic reviews and meta-analyses
  • Cell line provenance
  • Field sample provenance
  • Humane endpoints in animal studies
  • Data availability
  • Plagiarism

The care that we take in reporting and oversight is rooted in PLOS’ commitment to this editorial responsibility.

Because of these checks, every PLOS ONE citation on a researcher’s CV shows that their work has reached high standards of reporting and oversight – something that matters a great deal to funders and institutions as the need for reproducibility becomes increasingly a part of their overall mission. This is an area where we feel journals can take a lead: high standards of reporting are the best way for the scientific community to regain the trust of the public and politicians in the wake of the recent spate of failures in replicating high-profile discoveries.

Unrestricted scope:

So many of the delays in sharing results are a result of journals putting unnecessary restrictions on the scope of the research they are willing to publish. Journals often withhold the release of negative findings because they are likely to be cited less, and will therefore lower their impact factor. Or they exclude papers purely due to the application of disciplinary boundaries. In this digital age, with no space restrictions on what can be published, such artificial limits only impede the flow of information. At PLOS ONE, we have thrown out these notions and will consider vital research across all subject areas (even seemingly strange and multi-disciplinary).

A heartfelt 100k thank you

The impact of PLOS ONE on scientific publishing has been tremendous and revolutionary. The world of scientific communication is a different place because of it, and that is something PLOS and its entire community of collaborators should be proud of.

The extraordinary PLOS ONE Editorial Board, reviewers and authors – who believed in the PLOS mission to accelerate research communication and gave their own time to review, edit and revise manuscripts – were critical to this transformation and share in this milestone. To each and every one of them PLOS ONE is eternally grateful.

So here’s to the 100,000th PLOS ONE article. Though thrilled to have reached this milestone, we are even more excited to see where the next 100,000 will lead.

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