A5040401640- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Hydrology and Watershed Management Studies
- Species Distribution and Climate Change
- Soil and Water Nutrient Dynamics
- Ecology and Vegetation Dynamics Studies
- Soil erosion and sediment transport
- Environmental DNA in Biodiversity Studies
- Invertebrate Taxonomy and Ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrological Forecasting Using AI
- Water Quality and Pollution Assessment
- Animal Ecology and Behavior Studies
- Fire effects on ecosystems
- Diatoms and Algae Research
- Ecology and biodiversity studies
- Botany, Ecology, and Taxonomy Studies
- Flood Risk Assessment and Management
- Environmental and Social Impact Assessments
- Fish biology, ecology, and behavior
- Diversity and Career in Medicine
- Plant and animal studies
- Coastal wetland ecosystem dynamics
Utah State University
2016-2025
China National Environmental Monitoring Center
2021
John Wiley & Sons (United States)
2018
Ecological Society of America
2018
IFC Research (United Kingdom)
2018
Virginia Wesleyan College
2010-2013
Wyoming Department of Education
2011
University of South Florida
2010
Watershed
2007
Oregon State University
1981-1984
An important component of the biological assessment stream condition is an evaluation direct or indirect effects human activities disturbances. The concept a "reference condition" increasingly used to describe standard benchmark against which current compared. Many individual nations, and European Union as whole, have codified reference in legislation aimed at protecting improving ecological streams. However, phrase has many meanings variety contexts. One primary purposes this paper bring...
We review the major conceptual developments that have occurred over last 50 years concerning factors influence insect biodiversity in streams and examine how well empirical descriptions theory match. Stream insects appear to respond both spatial temporal variation physical heterogeneity. At all scales, data largely support idea complexity promotes biological richness, although exceptions this relationship were found. These may be related we measure habitat at finer scales regional such as...
We propose a hierarchical system of classifying stream habitats based on three increasingly fine descriptions the morphological and hydraulic properties channel geomorphic units. define units as areas relatively homogeneous depth flow that are bounded by sharp gradients in both flow. Differences among these provide natural basis for habitat classification is independent spatial scale. At most general level resolution, we divide into fast- slow-water categories approximately correspond to...
The ratio of the number observed taxa to that expected occur in absence human-caused stress (O/E) is an intuitive and ecologically meaningful measure biological integrity. We examined how O/E ratios derived from stream invertebrate data varied among 234 unimpaired reference sites 254 test potentially impaired by past logging. Data were collected streams three montane ecoregions California. Two sets River Invertebrate Prediction Classification System (RIVPACS) predictive models built: one set...
The relative importance of surrounding riparian vegetation and substrate composition on invertebrate community structure was investigated in six streams Oregon, USA. We found that canopy type more important than character influencing total abundance guild structure. Streams without shading had higher abundances invertebrates did shaded streams. Most guilds were influenced by qualitative differences food availability rather quantity or composition. Open the collector-gatherer, filter feeder,...
Benchmarks provide context and are a critical element of all ecological assessments. Over the last 25 y, hundreds papers have been published on various aspects assessments, most analyses described in these depend specifying an benchmark for context. Freshwater scientists managers usually use reference sites (typically natural or least-disturbed condition) to assess conditions at other sites. Accurate precise assessments require that assessed be matched with appropriate conditions. Two...
Ion-specific standards are needed to protect biodiversity
Global freshwater biodiversity is declining dramatically, and meeting the challenges of this crisis requires bold goals mobilisation substantial resources. While reasons are varied, investments in both research conservation lag far behind those terrestrial marine realms. Inspired by a global consultation, we identify 15 pressing priority needs, grouped into five areas, an effort to support informed stewardship biodiversity. The proposed agenda aims advance globally as critical step improving...
This review summarizes the state of knowledge regarding herbivory in stream ecosystems by quantitatively analyzing results 89 experimental studies published between 1972 and 1993. Our primary objective was to determine if general patterns exist among type strength interactions occurring herbivores (grazers) their food source, periphyton. We conducted two types meta-analyses literature: (1) analyses proportion showing significant effects for three (effects grazers on periphyton, periphyton...
This paper summarizes and synthesizes the collective results that emerged from series of papers published in this issue J-NABS, places these context previously literature describing variation aquatic biota at landscape spatial scales. Classifications based on scales are used or being evaluated for use several countries bioassessment programs. Evaluation strength classification different approaches should provide insight refinement existing programs expedite development new The specifically...
Small streams differing in sediment composition were compared logged and forested reaches to determine effects of accumulated fine on stream communities under different trophic conditions. Three stages forest community succession studied the Cascade Mountains: Recently clear-cut areas without canopy (5–10 years after logging); second-growth with deciduous (30–40 old-growth coniferous (>450 old). One mostly coarse (56–76% cobble) one more (5–14% sand 23–53% gravel) contrasted for each...
Relative numerical dominance and densities of invertebrate functional feeding groups are compared with longitudinal seasonal changes in food resources a Cascade Range stream system Oregon. We also compare our data hypothetical predictions the River Continuum model. found that both relative abundances fit qualitative characterization reaches model: Shredders dominated upper shaded reaches; scrapers were most important intermediate—sized sections; collectors increased importance progressively...
Relationships between density of fish and salamanders, riparian canopy, physical habitat were investigated by studying 10 pairs streams. Among vertebrate taxa, salmonids sculpins more abundant in streams without shading than shaded Abundance salamanders was not affected canopy type. Densities both correlated with substrate composition, whereas salmonid abundance or only weakly so. Salamanders found at high-gradient sites coarse substrates, most lower-gradient finer-sized sediments. An...
One of the biggest challenges when conducting a continental-scale assessment streams is setting appropriate expectations for assessed sites. The challenge occurs 2 reasons: 1) tremendous natural environmental heterogeneity exists within continental landscape and 2) reference sites vary in quality both across major regions continent. We describe process used to set multimetric index biotic integrity (MIBI) observed/expected (O/E) indices generated from predictive models assess stream...
Temperature is known to be an important mechanism affecting the growth and distribution of stream insects. However, little information exists that describes how variable temperatures are among streams similar size, especially in physically heterogeneous landscapes. We measured summer daytime temperature structure riffle benthic insect assemblages from 45 montane California. Summer was nearly randomly distributed across large-scale geographic gradients latitude (6°) elevation (2000 m). The...
The Wadeable Streams Assessment (WSA) provided the first statistically sound summary of ecological condition streams and small rivers in US. Information assessment filled an important gap meeting requirements US Clean Water Act. purpose WSA was to: 1) report on all wadeable, perennial within conterminous US, 2) describe biological these systems with direct measures aquatic life, 3) identify rank relative importance chemical physical stressors affecting stream river condition. included...
Water resources managers and conservation biologists need reliable, quantitative, directly comparable methods for assessing the biological integrity of world's aquatic ecosystems. Large-scale assessments are constrained by lack consistency in indicators used to assess our current inability translate between indicators. In theory, based on estimates taxonomic completeness, i.e., proportion expected taxa that were observed (observed/expected, O/E) one another should therefore allow regionally...
Streams and rivers are important conduits of terrestrially derived carbon (C) to atmospheric marine reservoirs. Leaf litter breakdown rates expected increase as water temperatures rise in response climate change. The magnitude is uncertain, given differences quality microbial detritivore community responses temperature, factors that can influence the apparent temperature sensitivity relative proportion C lost atmosphere vs. stored or transported downstream. Here, we synthesized 1025 records...
Human activities create threats that have consequences for freshwater ecosystems and, in most watersheds, observed ecological responses are the result of complex interactions among multiple and their associated alterations. Here we discuss value considering research management, offer suggestions filling knowledge gaps, provide guidance addressing urgent management challenges posed by ecosystems. There is a growing literature assessing to alterations, build off this background identify three...
Abstract Aim Freshwater biodiversity is declining world‐wide as a result of human‐caused degradation freshwater ecosystems. Declines in species richness are well documented for many taxonomic groups, but less known about how and why composition beta diversity (β) change response to environmental environments. Location The Mid‐ A tlantic Highlands region the USA (36–42° N , 74–82° E ) F inland northern urope (60–68° 20–32° ). Methods We used null models, occupancy analyses, ordinations...