Variable Effects of Snow Conditions Across Boreal Mesocarnivore Species

Mesocarnivores are increasingly recognized as key drivers of community dynamics, but the effects of bottom-up and abiotic factors on mesocarnivore populations remain poorly understood. We evaluated the effects of snow conditions, prey abundance, and habitat type on the distribution of five sympatric mesocarnivore species in interior Alaska using repeated snow track surveys and occupancy modelling. Snow depth and snow compaction were the best predictors of mesocarnivore occupancy, with differential effects across species. Coyotes (Canis latrans (Say, 1823)) and red foxes (Vulpes vulpes L., 1758) occurred in areas of shallow, compact snow, Canada lynx (Lynx canadensis (Kerr, 1792)) occurred in areas of shallow, fluffy snow, and wolverines (Gulo gulo L., 1758) and marten (Martes americana (Turton, 1806)) occurred in areas of deep, fluffy snow. These findings indicate that altered snow conditions due to climate change may have strong direct effects on the distribution of northern mesocarnivores, with divergent effects across species

The Artist-Shaman and the \"Gift of Sight\"

Throughout the history of art the role of the artist has been compared to the role of the shaman. This is because the artist’s role has always been one of mediator, transformer and most prominently visionary. The role of both the artist and shaman has always been to stand between two worlds: that of the visible and the invisible. The viewers, or the community in the case of the shaman, entrust the artist to go forth into the realm of the invisible and return with a gift: the invisible transformed into the visible. Traditionally, many artists associated with shamanism such as Joseph Beuys, Max Ernst, Leonora Carrington and later Matthew Barney, have been leaders, idealists, heroes of mythic proportions, artists who return with this gift: a vision or sight to follow. But a different breed of artist associated with shamanism also exists: an ambivalent artist-shaman, a shifty and unreliable character of dubious motivations, who appears to offer the viewer a vision or sight and then throws it back in their face, makes them decide. This is the role that Hany Armanious, John Bock, Carla Cescon, Marcus Coates, Mikala Dwyer, Steinar Haga Kristensen, Jonathan Meese, Paul Thek, Justene Williams and myself have taken. And we take it so as to return to the viewer the very power that is invested in the artist, that of creating a vision: what Rex Butler refers to in relation to Hany Armanious as the “gift of sight.” (Butler 2000). These artists and myself offer the “gift of sight” by reflecting the act of perception and by engaging the viewer in the same process that the artist goes through. The way we do this is by setting up complex, multi-positional, process-based systems that are highly informed and engaging but do not lead to an end position. Because the artist does not presume to idealise this end position, the result is inevitably confusing, slippery, uncertain, and ambivalent, as if the artist has no position or avoids commitment. This thesis sets out to inves! tigate t his ambivalent position taken by the artist-shaman and to show how and why it is taken. It does this in two ways. Firstly it provides a studio component as a practical example of the practice of an artist-shaman who offers the “gift of sight.” Secondly, the written dissertation provides a theory and understanding of the artist-shaman who offers the “gift of sight.” This may then be applied to the practical component, offering a historical and philosophical context with which to frame it

Estimation and Mapping of Wet and Dry Mercury Deposition Across Northeastern North America

Whereas many ecosystem characteristics and processes influence mercury accumulation in higher trophic-level organisms, the mercury flux from the atmosphere to a lake and its watershed is a likely factor in potential risk to biota. Atmospheric deposition clearly affects mercury accumulation in soils and lake sediments. Thus, knowledge of spatial patterns in atmospheric deposition may provide information for assessing the relative risk for ecosystems to exhibit excessive biotic mercury contamination. Atmospheric mercury concentrations in aerosol, vapor, and liquid phases from four observation networks were used to estimate regional surface concentration fields. Statistical models were developed to relate sparsely measured mercury vapor and aerosol concentrations to the more commonly measured mercury concentration in precipitation. High spatial resolution deposition velocities for different phases (precipitation, cloud droplets, aerosols, and reactive gaseous mercury (RGM)) were computed using inferential models. An empirical model was developed to estimate gaseous elemental mercury (GEM) deposition. Spatial patterns of estimated total mercury deposition were complex. Generally, deposition was higher in the southwest and lower in the northeast. Elevation, land cover, and proximity to urban areas modified the general pattern. The estimated net GEM and RGM fluxes were each greater than or equal to wet deposition in many areas. Mercury assimilation by plant foliage may provide a substantial input of methyl-mercury (MeHg) to ecosystems.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44443/1/10646_2004_Article_6259.pd

Risk profiles and one-year outcomes of patients with newly diagnosed atrial fibrillation in India: Insights from the GARFIELD-AF Registry.

BACKGROUND: The Global Anticoagulant Registry in the FIELD-Atrial Fibrillation (GARFIELD-AF) is an ongoing prospective noninterventional registry, which is providing important information on the baseline characteristics, treatment patterns, and 1-year outcomes in patients with newly diagnosed non-valvular atrial fibrillation (NVAF). This report describes data from Indian patients recruited in this registry. METHODS AND RESULTS: A total of 52,014 patients with newly diagnosed AF were enrolled globally; of these, 1388 patients were recruited from 26 sites within India (2012-2016). In India, the mean age was 65.8 years at diagnosis of NVAF. Hypertension was the most prevalent risk factor for AF, present in 68.5% of patients from India and in 76.3% of patients globally (P < 0.001). Diabetes and coronary artery disease (CAD) were prevalent in 36.2% and 28.1% of patients as compared with global prevalence of 22.2% and 21.6%, respectively (P < 0.001 for both). Antiplatelet therapy was the most common antithrombotic treatment in India. With increasing stroke risk, however, patients were more likely to receive oral anticoagulant therapy [mainly vitamin K antagonist (VKA)], but average international normalized ratio (INR) was lower among Indian patients [median INR value 1.6 (interquartile range {IQR}: 1.3-2.3) versus 2.3 (IQR 1.8-2.8) (P < 0.001)]. Compared with other countries, patients from India had markedly higher rates of all-cause mortality [7.68 per 100 person-years (95% confidence interval 6.32-9.35) vs 4.34 (4.16-4.53), P < 0.0001], while rates of stroke/systemic embolism and major bleeding were lower after 1 year of follow-up. CONCLUSION: Compared to previously published registries from India, the GARFIELD-AF registry describes clinical profiles and outcomes in Indian patients with AF of a different etiology. The registry data show that compared to the rest of the world, Indian AF patients are younger in age and have more diabetes and CAD. Patients with a higher stroke risk are more likely to receive anticoagulation therapy with VKA but are underdosed compared with the global average in the GARFIELD-AF. CLINICAL TRIAL REGISTRATION-URL: http://www.clinicaltrials.gov. Unique identifier: NCT01090362