Derek L Sonderegger

Derek L Sonderegger
W. L. Gore & Associates · Medical Products Division

About

33
Publications
7,779
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978
Citations
Citations since 2016
20 Research Items
848 Citations
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2016201720182019202020212022050100150
2016201720182019202020212022050100150

Publications

Publications (33)
Article
Full-text available
Nearly half a century ago, two papers postulated the likelihood of lunar lava tube caves using mathematical models. Today, armed with an array of orbiting and fly-by satellites and survey instrumentation, we have now acquired cave data across our solar system—including the identification of potential cave entrances on the Moon, Mars, and at least n...
Article
Full-text available
Since the initial experiments nearly 50 years ago, techniques for detecting caves using airborne and spacecraft acquired thermal imagery have improved markedly. These advances are largely due to a combination of higher instrument sensitivity, modern computing systems, and processor intensive analytical techniques. Through applying these advancement...
Article
Introduction Several studies have reported that children gain more weight during the summer season. Despite high obesity rates, little research has included American Indian/Alaskan Native children, and few studies have been longitudinal. This observational study examines seasonal weight variability over 3.5 years among ethnically diverse children,...
Article
Full-text available
In this study we examined changes to the human gut microbiome resulting from an eight-week intervention of either cardiorespiratory exercise (CRE) or resistance training exercise (RTE). Twenty-eight subjects (21 F; aged 18–26) were recruited for our CRE study and 28 subjects (17 F; aged 18–33) were recruited for our RTE study. Fecal samples for gut...
Article
As one of the last remaining naturally grazed ecosystems on Earth, the Serengeti National Park is an ideal location to study the influence of migratory mammals on the structure of microbial communities and the factors that generate biogeography of soil microbes. Furthermore, volcanic inputs generate environmental gradients that may also structure m...
Poster
Full-text available
Caves often support sensitive animal populations ranging from bats to subterranean-adapted invertebrates, salamanders, and fishes. Developing a framework to detect caves using GIS and remote sensing could serve as an invaluable conservation tool. Researchers could systematic identify caves on the landscape, prioritize caves for biological survey du...
Preprint
Full-text available
Field-based observational research is the first step in understanding the factors that predict the biogeography and community structure of soil microbes. The Serengeti National Park in Tanzania is an ideal location for this type of research because active volcanoes generate strong environmental gradients due to ash deposition and a rain shadow. Als...
Article
Full-text available
The original publication of this Article included analysis of virus and microbial cell abundances and virus-to-microbial cell ratios. Data in the Article came from 25 studies intended to be exclusively from marine sites. However, 3 of the studies included in the original unified dataset were erroneously classified as marine sites during compilation...
Article
Non-motorized human recreation may displace animals from otherwise suitable habitat; in addition, animals may alter their activity patterns to reduce (or increase) interactions with recreationists. We investigated how hiking, mountain biking, equestrians, and recreationists with domestic dogs affected habitat use and diel activity patterns of ten s...
Article
Full-text available
Non-motorized human recreation may displace animals from otherwise suitable habitat; in addition, animals may alter their activity patterns to reduce (or increase) interactions with recreationists. We investigated how hiking, mountain biking, equestrians, and recreationists with domestic dogs affected habitat use and diel activity patterns of ten s...
Article
Full-text available
Q-fever is an underreported disease caused by the bacterium Coxiella burnetii, which is highly infectious and has the ability to disperse great distances. It is a completely clonal pathogen with low genetic diversity and requires whole-genome analysis to identify discriminating features among closely related isolates. C. burnetii, and in particular...
Article
Full-text available
In the United States, humans spend the majority of their time indoors, where they are exposed to the microbiome of the built environment (BE) they inhabit. Despite the ubiquity of microbes in BEs and their potential impacts on health and building materials, basic questions about the microbiology of these environments remain unanswered. We present a...
Preprint
Full-text available
North Americans spend the majority of their time indoors where they are exposed to the microbiome of the built environment (BE) they inhabit. Despite the ubiquity of microbes in BEs, and their potential impacts on health and building materials, basic questions about the microbiology of these environments remain unanswered. We present a study on the...
Preprint
Full-text available
North Americans spend the majority of their time indoors where they are exposed to the microbiome of the built environment (BE) they inhabit. Despite the ubiquity of microbes in BEs, and their potential impacts on health and building materials, basic questions about the microbiology of these environments remain unanswered. We present a study on the...
Article
Full-text available
Marine viruses are critical drivers of ocean biogeochemistry, and their abundances vary spatiotemporally in the global oceans, with upper estimates exceeding 108 per ml. Over many years, a consensus has emerged that virus abundances are typically tenfold higher than microbial cell abundances. However, the true explanatory power of a linear relation...
Article
This paper reports on a research project that investigated the effects of a flipped instructional approach on student attitudes and achievement in a lower division university-level Finite Mathematics course. The project employed a mixed-methods design that included content exams, an attitude survey, open-ended student responses, observations, and i...
Preprint
Full-text available
Marine viruses are critical drivers of ocean biogeochemistry and their abundances vary spatiotem- porally in the global oceans, with upper estimates exceeding 10 8 per ml. Over many years, a con- sensus has emerged that virus abundances are typically 10-fold higher than prokaryote abundances. The use of a fixed-ratio suggests that the relationship...
Article
Full-text available
Viral lysis of microbial hosts releases organic matter that can then be assimilated by nontargeted microorganisms. Quantitative estimates of virus-mediated recycling of carbon in marine waters, first established in the late 1990s, were originally extrapolated from marine host and virus densities, host carbon content and inferred viral lysis rates....
Conference Paper
Background/Question/Methods Traditional occupancy models using presence/absence data require multiple observation periods for detection and presence probabilities to be estimable. When camera trap data is used, this requirement typically results in the creation of artificial time periods that may or may not make biological sense. We propose a sam...
Article
Full-text available
Carbon dioxide is the main greenhouse gas inducing climate change. Increased global CO2 emissions, estimated at 8.4 Pg C yr(-1) at present, have accelerated from 1% yr(-1) during 1990-1999 to 2.5% yr(-1) during 2000-2009 (ref. 1). The carbon balance of terrestrial ecosystems is the greatest unknown in the global C budget because the actual magnitud...
Article
Fine sediment derived from catchment erosion can adversely impact aquatic ecosystems. Previous studies of lake sediment deposits in western Canada attributed increased sedimentation to land use; however, high catchment variability and short- and long-term climatic responses complicated the interpretation of those regional records. We compiled a lar...
Article
Full-text available
We construct the fiducial model for free-knot splines and derive sufficient conditions to show asymptotic consistency of a multivariate fiducial estimator. We show that splines of degree four and higher satisfy those conditions and conduct a simulation study to evaluate quality of the fiducial estimates compared to the competing Bayesian solution....
Article
Deserts are considered 'below-ground dominated', yet little is known about the impact of rising CO(2) in combination with natural weather cycles on long-term dynamics of root biomass. This study quantifies the temporal dynamics of fine-root production, loss and standing crop in an intact desert ecosystem exposed to 10 yr of elevated CO(2) . We used...
Article
Arid ecosystems are predicted to be among the most responsive to global change and their response is globally significant considering their extensive spatial coverage. Although carbon cycling in arid lands is an important component of the global carbon budget, there is substantial uncertainty about the potential impacts of global change drivers, su...
Article
Full-text available
Abstract Ecological thresholds have been applied conventionally to characterize relationships between stressors and biological responses. We demonstrated how ecological thresholds can be used to assess recovery in a system where stressors have been removed. We applied a relatively new statistical approach, the significant zero crossings (SiZer) mod...
Conference Paper
Background/Question/Methods Quantifying belowground carbon fluxes and stocks presents one of the greatest challenges to understanding and predicting the terrestrial carbon cycle. Deserts cover ~30% of the terrestrial biosphere and are considered belowground dominated, yet little is known about the impacts of rising CO2 and altered precipitation on...
Article
Full-text available
The effect that measurement error of predictor variables has on regression inference is well known in the statistical literature. However, the influence of measurement error on the ability to quantify relationships between chemical stressors and biological responses has received little attention in ecotoxicology. We present a common data-collection...
Article
Ecological systems can change substantially in response to small shifts in environmental conditions. Such changes are characterized by a non-linear relationship between the value of the response variable and one or more explanatory variables. Documenting the magnitude of change and the environmental conditions that give rise to these threshold resp...

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