A5004012768- Geology and Paleoclimatology Research
- Environmental DNA in Biodiversity Studies
- Isotope Analysis in Ecology
- Ecosystem dynamics and resilience
- Microbial Community Ecology and Physiology
- Land Use and Ecosystem Services
- Geological formations and processes
- Aquatic Ecosystems and Phytoplankton Dynamics
- Diatoms and Algae Research
- Sustainability and Ecological Systems Analysis
- Geophysical and Geoelectrical Methods
- Animal Ecology and Behavior Studies
- Geophysical Methods and Applications
- Soil erosion and sediment transport
- Marine and coastal ecosystems
- Soil Geostatistics and Mapping
- Ecology and Vegetation Dynamics Studies
- Archaeology and ancient environmental studies
- Geochemistry and Elemental Analysis
- Water Resources and Management
- Arsenic contamination and mitigation
- Environmental Sustainability and Technology
- Integrated Water Resources Management
- Climate change impacts on agriculture
- Aeolian processes and effects
University of Toledo
2019-2024
The University of Texas at Austin
2017-2020
University of Nebraska–Lincoln
2011-2019
Environmental Protection Agency
2016-2018
National Academies of Sciences, Engineering, and Medicine
2016-2018
John Wiley & Sons (United States)
2018
Ecological Society of America
2018
IFC Research (United Kingdom)
2018
University of California, Berkeley
2009
The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field paleoecological research. Although largely applied nowadays, knowledge gaps remain this there therefore still research be conducted ensure reliability signal. Building on most recent literature seven original case studies, we synthesize state-of-the-art analytical procedures for effective sampling, extraction, amplification, quantification and/or generation...
Over the 20th century, surface water temperatures have increased in many lake ecosystems around world, but long-term trends vertical thermal structure of lakes remain unclear, despite strong control that stratification exerts on biological response to climate change. Here we used both neo- and paleoecological approaches develop a fossil-based inference model for mixing depths thereby refine understanding We focused three common planktonic diatom taxa, distributions which previous research...
Abstract Ancient lakes are among the best archivists of past environmental change, having experienced more than one full glacial cycle, a wide range climatic conditions, tectonic events, and long association with human settlements. These not only record histories variation activity in their sediments, but also harbor very high levels biodiversity endemism. Yet, ancient faced familiar suite anthropogenic threats, which may degrade unusual properties that make them especially valuable to...
Regime shifts are generally defined as the point of 'abrupt' change in state a system. However, seemingly abrupt transition can be product system reorganization that has been ongoing much longer than is evident statistical analysis single component Using both univariate and multivariate methods, we tested long-term high-resolution paleoecological dataset with known species assemblage for regime shift. Analysis this Fisher Information time series modeling showed there was a∼2000 year period...
Summary Human impacts on the environment are multifaceted and can occur across distinct spatiotemporal scales. Ecological responses to environmental change therefore difficult predict, entail large degrees of uncertainty. Such uncertainty requires robust tools for management sustain ecosystem goods services maintain resilient ecosystems. We propose an approach based discontinuity theory that accounts patterns processes at spatial temporal scales, inherent property ecological systems....
Research on early warning indicators has generally focused assessing temporal transitions with limited application of these methods to detecting spatial regimes. Traditional boundary detection procedures that result in ecoregion maps are typically based ecological potential (i.e. vegetation), and often fail account for ongoing changes due stressors such as land use change climate their effects plant animal communities. We Fisher information, an information theory-based method, both...
ABSTRACT Acidovorax ebreus strain TPSY is the first anaerobic nitrate-dependent Fe(II) oxidizer for which there a completed genome sequence. Preliminary protein annotation revealed an organism optimized survival in complex environmental system. Here, we briefly report and annotated sequence of TPSY.
Nemec, K. T., J. Chan, C. Hoffman, T. L. Spanbauer, A. Hamm, R. Allen, Hefley, D. Pan, and P. Shrestha. 2013. Assessing resilience in stressed watersheds. Ecology Society 19(1): 34. https://doi.org/10.5751/ES-06156-190134
Communities of organisms, from mammals to microorganisms, have discontinuous distributions body size. This pattern size structuring is a conservative trait community organization and product processes that occur at multiple spatial temporal scales. In this study, we assessed whether patterns serve as an indicator threshold between alternative regimes. Over the past 7000 years, biological communities Foy Lake (Montana, USA) undergone major regime shift owing climate change. We used...
Research Article| August 01, 2012 Biosignatures link microorganisms to iron mineralization in a paleoaquifer Karrie A. Weber; Weber * 1School of Biological Sciences, University Nebraska, Lincoln, Nebraska 68588, USA2Department Earth and Atmospheric 68583, USA *E-mail: kweber2@unl.edu. Search for other works by this author on: GSW Google Scholar Trisha L. Spanbauer; Spanbauer †Current address: Department USA. David Wacey; Wacey 3Centre Microscopy, Characterisation Analysis, Western Australia,...
Abstract High levels of biodiversity and endemism in ancient lakes have motivated research on evolutionary processes these systems. Drill-core records from Lake Titicaca (Bolivia, Peru), an lake the high-elevation Altiplano, record history climate, landscape dynamics, diatom evolution. That was used to examine patterns drivers morphological evolution endemic species complex diatoms lake, Cyclostephanos andinus complex. In attempt delineate within based morphology, no discernible evidence...
Cores from Searsville Lake within Stanford University's Jasper Ridge Biological Preserve, California, USA, are examined to identify a potential GSSP for the Anthropocene: core JRBP2018-VC01B (944.5 cm-long) and tightly correlated JRBP2018-VC01A (852.5 cm-long). Spanning 1900 CE ± 3 years 2018 CE, secure chronology resolved sub-annual level allows detailed exploration of Holocene-Anthropocene transition. We primary marker as first appearance 239,240Pu (372-374 cm) in designate depth distinct...
Recent global changes associated with anthropogenic activities are impacting ecological systems globally, giving rise to the Anthropocene. Critical reorganization of biological communities and biodiversity loss expected accelerate as change continues. Long-term records offer context for understanding baseline conditions those trajectories that beyond range normal fluctuation seen over recent millennia: Are we causing fundamentally different from in past? Using a rich dataset late Quaternary...
As global change processes modify the extent and functions of terrestrial–aquatic interfaces, variability critical dynamic transitional zones between wetlands uplands increases. However, it is still unclear how fluctuating water levels at these boundaries alter groundwater biogeochemical cycling. Here, we used high-temporal resolution data along gradients from to during freshwater coastal areas capture spatiotemporal patterns redox potential (Eh). We observed that topography influences Eh...
Abstract The cross‐scale resilience model suggests that system‐level ecological emerges from the distribution of species’ functions within and across spatial temporal scales a system. It has provided quantitative method for calculating given system so been valuable contribution to largely qualitative field. As it is currently laid out, accounts at which environmental resources species are present functional roles play but does not inform us about how much resource or function provided. In...
Abstract Purpose The land-lake interface is a unique zone where terrestrial and aquatic ecosystems meet, forming part of the Earth’s most geochemically biologically active zones. characteristics this are yet to be properly understood due inherently high spatiotemporal variability subsurface properties, which difficult capture with traditional soil sampling methods. Geophysical methods offer non-invasive techniques variabilities in properties at resolution across various scales. Methods We...
A recent paradigm shift from purely biophysical towards social-ecological assessment of watersheds has been proposed to understand, monitor, and manipulate the myriad interactions between human well-being ecosystem services that provide. However, large-scale, quantitative studies in this endeavour remain limited. We utilised two newly developed ‘big-data’ sets—the Index Watershed Integrity (IWI) Human Well-Being (HWBI)—to explore condition throughout conterminous U.S., identified...
Abstract. The Neogene and Quaternary are characterized by enormous changes in global climate environments, including cooling the establishment of northern high-latitude glaciers. These reshaped ecosystems, emergence tropical dry forests savannahs that found Africa today, which turn may have influenced evolution humans their ancestors. However, despite decades research we lack long, continuous, well-resolved records climate, ecosystem changes, surface processes necessary to understand...
Abstract Understanding plankton dynamics in marine ecosystems has been advanced using situ molecular and imaging instrumentation. A range of research objectives have addressed through high‐resolution autonomous sampling, from food web characterization to harmful algal bloom dynamics. When used together, sensors can cover the full‐size range, genetic identity, life stages plankton. Here, we briefly review a selection instrumentation developed for collection information on communities...
1. Abstract We use three-dimensional modeling of the basin Hidden Lake, Montana, to assess influence effective fetch on diatom-inferred changes in mixing depths throughout Holocene. The Lake is characterized by a complex morphometry; for example, lake indicates that decrease level two meters would result complete isolation deepest part from rest lake. Our model suggests small surface elevation at produce threshold-like responses fetch, which turn have profound average depth. present-day...