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Vines T.H.,University of British Columbia | Vines T.H.,6270 University Boulevard | Albert A.Y.K.,Oak Street Health | Andrew R.L.,University of British Columbia | And 10 more authors.
Current Biology | Year: 2014

Policies ensuring that research data are available on public archives are increasingly being implemented at the government [1], funding agency [2-4], and journal [5, 6] level. These policies are predicated on the idea that authors are poor stewards of their data, particularly over the long term [7], and indeed many studies have found that authors are often unable or unwilling to share their data [8-11]. However, there are no systematic estimates of how the availability of research data changes with time since publication. We therefore requested data sets from a relatively homogenous set of 516 articles published between 2 and 22 years ago, and found that availability of the data was strongly affected by article age. For papers where the authors gave the status of their data, the odds of a data set being extant fell by 17% per year. In addition, the odds that we could find a working e-mail address for the first, last, or corresponding author fell by 7% per year. Our results reinforce the notion that, in the long term, research data cannot be reliably preserved by individual researchers, and further demonstrate the urgent need for policies mandating data sharing via public archives. © 2014 Elsevier Ltd.

Marcus J.,University of British Columbia | Coops N.C.,University of British Columbia | Ellis S.,6270 University Boulevard | Robinson J.,University of British Columbia
Current Opinion in Environmental Sustainability | Year: 2015

The University of British Columbia's (UBC) long-term vision is to embed sustainability in all of its undergraduate teaching programs. The University has described four student sustainability attributes. -. Holistic Systems Thinking, Sustainability Knowledge, Awareness and Integration, and Acting for Positive Change. -. to help guide academic units to develop sustainability learning pathways. These pathways are loosely defined as any combination of curricular experiences that, when combined, equip undergraduate students with a firm grounding in the four attributes in the context of sustainability. Amongst the early adoption of the attributes has been their application at the course level in a pilot introductory course, 'SUST 101', and their use in designing a sustainability pathway within the Faculty of Science. In this paper we describe the structures developed at UBC to support and enable sustainability education, summarize the curriculum framework for sustainability at UBC, and present curriculum examples that employ the University's sustainability education framework. © 2015 Elsevier B.V.

Yubuki N.,6270 University Boulevard | Leander B.S.,6270 University Boulevard | Silberman J.D.,University of Arkansas
Protist | Year: 2010

A novel free free-living phagotrophic flagellate, Rictus lutensis gen. et sp. nov., with two heterodynamic flagella, a permanent cytostome and a cytopharynx was isolated from muddy, low oxygen coastal sediments in Cape Cod, MA, USA. We cultivated and characterized this flagellate with transmission electron microscopy, scanning electron microscopy and molecular phylogenetic analyses inferred from small subunit (SSU) rDNA sequences. These data demonstrated that this organism has the key ultrastructural characters of the Bicosoecida, including similar transitional zones and a similar overall flagellar apparatus consisting of an x fiber and an L-shape microtubular root 2 involved in food capture. Although the molecular phylogenetic analyses were concordant with the ultrastructural data in placing R. lutensis with the bicosoecid clade, the internal position of this relatively divergent sequence within the clade was not resolved. Therefore, we interpret R. lutensis gen. et sp. nov. as a novel bicosoecid incertae sedis. © 2009 Elsevier GmbH. All rights reserved.

Ispolatov I.,University of British Columbia | Doebeli M.,University of British Columbia | Doebeli M.,6270 University Boulevard
Theoretical Ecology | Year: 2011

We investigate how perturbations propagate up and down a food chain with and without self-interaction and omnivory. A source of perturbation is a shift in death rate of a trophic level, and the measure of perturbation is the difference between the perturbed and unperturbed steady-state populations. For Lotka-Volterra food chains with linear functional response, we show analytically that both intraspecific competition and intraguild predation can either dampen or enhance the propagation of perturbations, thus stabilizing or destabilizing the food web. The direction of the effect depends on the position of the source of perturbation, as well as on the position of the additional competitive and predatory links. These conclusions are confirmed numerically for a food chain with more realistic type II functional response. Our results extend and confirm previous numerical results for short food chains and support positions on both sides in the long-standing debate on the effect of intraspecific competition and omnivory on the stability of trophic systems. © 2010 Springer Science+Business Media B.V.

Kim E.,University of Wisconsin - Madison | Yubuki N.,6270 University Boulevard | Leander B.S.,6270 University Boulevard | Graham L.E.,University of Wisconsin - Madison
Protist | Year: 2010

Three heterotrophic stramenopiles-Apoikia lindahlii comb. nov. (Chrysophyceae), Filos agilis gen. et sp. nov. (Bicosoecida), and Nanos amicus gen. et sp. nov. (Bicosoecida)-were isolated from acidic peat bogs. The biflagellate A. lindahlii forms loose irregular colonies from which swimming cells may detach, and produces extensive mucilaginous material containing bacterial cells. Phylogenetic analyses of small subunit rDNA sequences demonstrated that A. lindahlii branches within the Chrysophyceae. While A. lindahlii is an obligate heterotroph, ultrastructural observations revealed a leukoplast in the perinuclear region. The pico-sized uniflagellates F. agilis and N. amicus were isolated from separate lakes and within the mucilage of A. lindahlii, suggesting their close associations in natural habitats. In SSU rDNA phylogenies, F. agilis and N. amicus were closely related to the bicosoecids Adriamonas, Siluania, Paramonas, and Nerada. While Filos, Nanos, and Siluania are similar in light microscopic features, their SSU rDNA gene sequences differed significantly (>8% differences) and were not monophyletic. Both F. agilis and N. amicus have a cytostome/cytopharynx particle ingestion apparatus. Bacterial cells and material similar to the mucilage of A. lindahlii occurred within the food vacuole of F. agilis and N. amicus. The nature of association between A. lindahlii and its epibiontic bicosoecids is discussed. © 2009 Elsevier GmbH. All rights reserved.

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