A5052369791- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Invertebrate Ecology and Behavior
- Hydrology and Watershed Management Studies
- Hydrology and Sediment Transport Processes
- Environmental DNA in Biodiversity Studies
- Species Distribution and Climate Change
- Soil and Water Nutrient Dynamics
- Wildlife Ecology and Conservation
- Soil erosion and sediment transport
- Peatlands and Wetlands Ecology
- Constructed Wetlands for Wastewater Treatment
- Ecology and biodiversity studies
- Wastewater Treatment and Nitrogen Removal
- Isotope Analysis in Ecology
- Bat Biology and Ecology Studies
- Ecology and Vegetation Dynamics Studies
- Botany and Plant Ecology Studies
- Marine animal studies overview
- Water-Energy-Food Nexus Studies
- Animal and Plant Science Education
- Bryophyte Studies and Records
- Data Quality and Management
- Hydrological Forecasting Using AI
- Insect and Arachnid Ecology and Behavior
United States Geological Survey
2014-2023
University of Alaska Fairbanks
2022-2023
Astrogeology Science Center
2014-2022
Southwest Biological Science Center
2014-2022
Utah State University
2016
Oregon State University
2016
Idaho State University
2016
University of North Carolina at Chapel Hill
2008-2015
Northern Arizona University
2008
Duke University
2007
Dams impound the majority of rivers and provide important societal benefits, especially daily water releases that enable on-peak hydroelectricity generation. Such “hydropeaking” is common worldwide, but its downstream impacts remain unclear. We evaluated response aquatic insects, a cornerstone river food webs, to hydropeaking using life history–hydrodynamic model. Our model predicts aquatic-insect abundance will depend on basic life-history trait—adult egg-laying behavior—such open-water...
Abstract Worldwide, scientists are increasingly collaborating with the general public. Citizen science methods readily applicable to freshwater research, monitoring, and education. In addition providing cost‐effective data on spatial temporal scales that otherwise unattainable, citizen provides unique opportunities for engagement local communities stakeholders in resource management decision‐making. However, these not infallible. projects require deliberate planning order collect high...
It has been proposed that de novo synthesis of long-chain acyl-CoA (LC-CoA) is a signal for glucose-stimulated insulin secretion (GSIS). Key enzymes involved in fatty acids from glucose include ATP-citrate lyase (CL) and acid synthase (FAS). An inhibitor CL, hydroxycitrate (HC), reported to inhibit some laboratories but not others. Here we show high concentrations NaCl created during preparation HC by standard methods explain the inhibition GSIS, removal excess prevents effect. To further...
Abstract Background Large-river decision-makers are charged with maintaining diverse ecosystem services through unprecedented social-ecological transformations as climate change and other global stressors intensify. The interconnected, dendritic habitats of rivers, which often demarcate jurisdictional boundaries, generate complex management challenges. Here, we explore how the Resist–Accept–Direct (RAD) framework may enhance large-river by promoting coordinated deliberate responses to...
Abstract Aquatic primary production is the foundation of many river food webs. Dams change physical template rivers, often driving webs toward greater reliance on aquatic production. Nonetheless, effects regulated flow regimes are poorly understood. Load following a common dam management strategy that involves subdaily changes in water releases proportional to fluctuations electrical power demand. This regime causes an artificial tide, wetting and drying channel margins altering depth...
Evaluating environmental effects on fish growth can be challenging because conditions may vary at relatively fine temporal scales compared with sampling occasions. Here we develop a Bayesian state-space model to evaluate of monthly data that are observed less frequently (e.g., from mark–recapture where time between captures range months years). We assess temperature, turbidity, food availability, flow variability, and trout abundance subadult humpback chub (Gila cypha) in two rivers, the...
Abstract Rivers and their adjacent riparian zones are model ecosystems for observing cross‐ecosystem energy transfers. Aquatic insects emerging from streams, example, resource subsidies that support consumers such as birds, spiders, lizards, bats. We collaborated with recreational river runners in Grand Canyon, Arizona, USA, to record acoustic bat activity sample using light traps at dusk April through October 2017–2020. River collected these data on 1,428 events over 611 sampling nights 410...
Disturbances from flooding are a dominant feature of the habitat template in streams. Frequent floods created by recreational releases (1–2 d between releases/floods) Abanakee Dam Adirondack Mountains, USA, result static mosaic scoured patches areas high shear stress (low diatom densities) and mats algae low (refugia); this pattern is different shifting more typical streams recovering floods. Predictable, release similar bed size particle distributions stream enabled us to use reciprocal...
Abstract River biodiversity is threatened globally by hydropower dams, and there a need to understand how dam management favors certain species while filtering out others. We examined aquatic invertebrate communities within the tailwaters 0–24 km downstream of seven large dams in Colorado Basin western United States. quantified dominance, richness, abundance, biomass at multiple locations individual across basin identified biological community responses associated with operations distance...
Dam decommissioning projects, although numerous, rarely include complete sets of data before and after restoration for evaluating the ecological consequences such projects. In this study, we used a before-after control-impact (BACI) design to assess changes in leaf litter decomposition associated macroinvertebrate fungal decomposers following dam Fossil Creek, Arizona, USA. Leaf litterbags were deployed relatively pristine site above highly disturbed below where over 95% flow was previously...
Studies of aquatic–terrestrial ecosystem linkages explore the mechanisms by which components one ecosystem, such as aquatic insect community in a stream, directly affect an adjacent density and diversity riparian predators. On human level, research into these allows freshwater ecologists to form novel collaborations with stakeholders other interest groups emphasizing shared interests. To highlight this point, we use 3 case studies examples how can be leveraged achieve multifaceted goals...
Drift studies are central to stream and river ecological research. However, a fundamental aspect of quantifying drift — how net clogging affects the accuracy results has been widely ignored. Utilizing approaches from plankton suspended sediment in oceanography hydrology, we examined rate dynamics across range conditions. We found that nets clog nonlinearly over time solid concentrations mesh size exerted strong effect on rates. Critically, introduced unpredictable biases resultant data due...
Knickpoints are dynamic geomorphic formations in the longitudinal stream profile that have long been a subject of interest for geomorphologists, but largely unstudied ecology. We measured discharge, bed sediment, and macroinvertebrate communities around knickpoints forested urban catchments. introduced microscale heterogeneity discharge. This may be important providing refugia benthic biota during low-flow conditions, depending on condition sediment below knickpoint, which was highly...
Abstract. Dewatering disturbances are common in aquatic systems and represent a relatively untapped field of disturbance ecology, yet studying dewatering events along gradients non-dichotomous (i.e. wet/dry) terms is often difficult. Because many stream restorations can essentially be perceived as planned hydrologic manipulations, such make ideal test-cases for understanding processes hydrological disturbance. In this study we used an experimental drawdown 440 ha stream/wetland restoration...
Soil biogeochemical processes and the ecological stability of wetland ecosystems under global warming scenarios have gained increasing attention worldwide. Changes in capacity microorganisms to maintain stoichiometric homeostasis, or relatively stable internal concentrations elements, may serve as an indicator alterations soil their associated feedbacks. In this study, outdoor computerized microcosm was set up simulate a warmed (+5°C) climate scenario, using novel, minute-scale temperature...
Barcodes are used to label and track just about everything these days. Look around your office, in medicine cabinet, at the package you received mail, or on shelves of any shop town, will immediately grasp ubiquity their use. Interestingly, railroads supermarkets were early pioneers barcode development: former needing a way railway car location ownership national scale, latter diverse array products decrease checkout times (Nelson 1997). first came use sciences via field medicine, medical...
River-channel confluences create habitat heterogeneity by introducing multiple zones of hydraulic flow and increase macroinvertebrate densities diversity via the input coarse sediment, allochthonous detritus, nutrients. Current understanding confluence effects on stream community structure function is based mostly research conducted at medium-to-large tributary where nutrient detrital loads are typically high. Confluences headwater streams in without these materials understudied. In this...
Insect emergence is a fundamental process in freshwaters. It critical life-history stage for aquatic insects and provides an important prey resource terrestrial consumers. Sticky traps are increasingly being used to sample these insects. The most common design consists of acetate sheet coated with nondrying adhesive that attached wire frame or cylinder. These must be prepared at the deployment site, can time consuming difficult given vagaries field conditions. Our goals were develop sturdy,...
Abstract Humans have exaggerated natural habitat fragmentation, negatively impacting species dispersal and reducing population connectivity. Habitat fragmentation can be especially detrimental in freshwater populations, whose is already constrained by the river network structure. Aquatic insects, for instance, are generally limited to two primary modes of dispersal: downstream drift aquatic juvenile life stages flight during terrestrial winged adult stage. Yet impacts large hydropower dams...
ABSTRACT Pulsed salt tracer injections (salt slugs) are widely used for measuring discharge in streams, particularly small streams. However, slug usage stream ecology studies is limited, possibly due to concerns that may affect biotic results. We measurements concomitantly with macroinvertebrate sampling over the course of a summer field season and show realistic use slugs measure at our sites was benign respect several common community metrics. Salt warrant more as component studies....
Structural connectivity and dispersal ability are important constraints on functional among populations. For aquatic organisms that disperse stream corridors, the regional structure of a river network can, thus, define boundaries gene flow. In this study, we used mitochondrial DNA (mtCO1 barcoding gene) to examine genetic diversity population caddisfly with strong capabilities, Hydropsyche oslari (Trichoptera:Hydropsychidae), in topologically-diverse Colorado River Basin. We expected find...
Abstract Most of the world's large rivers are dammed for purposes water storage, flood control, and power production. Damming fundamentally alters temperature flows in tailwater ecosystems, which turn affects presence abundance downstream biota. We collaborated with more than 200 citizen scientists to collect 2,194 light trap samples across 2 years 2,000 river km. Samples contained 16,222 net‐spinning caddisfly ( Hydropsyche ) individuals six species. used these data model distribution...