A5066035889- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Oceanographic and Atmospheric Processes
- Water Quality and Resources Studies
- Water Quality Monitoring and Analysis
- Species Distribution and Climate Change
- Isotope Analysis in Ecology
- Fish Biology and Ecology Studies
- Geology and Paleoclimatology Research
- Geological formations and processes
- Physiological and biochemical adaptations
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Watershed Management Studies
- Crustacean biology and ecology
- Climate variability and models
- Underwater Acoustics Research
- Reservoir Engineering and Simulation Methods
- Soil erosion and sediment transport
- Atmospheric and Environmental Gas Dynamics
- Environmental DNA in Biodiversity Studies
- Fish biology, ecology, and behavior
- Animal Behavior and Reproduction
- Genetic diversity and population structure
National Park Service
2006-2025
Lake County
1995-2024
Globally, lake surface water temperatures have warmed rapidly relative to air temperatures, but changes in deepwater and vertical thermal structure are still largely unknown. We compiled the most comprehensive data set date of long-term (1970-2009) summertime temperature profiles lakes across world examine trends drivers whole-lake structure. found significant increases at an average rate + 0.37 °C decade-1, comparable reported previously for other lakes, similarly consistent increasing...
Abstract A remnant population of native Bull Trout Salvelinus confluentus was threatened with extirpation by competition and hybridization introduced Brook S. fontinalis in Sun Creek, a second‐order headwater stream Crater Lake National Park, Oregon. Between 1992 2005, artificial barriers were installed to exclude nonnative fish, multiple applications electrofishing the piscicide antimycin‐A used remove from 14.6 km stream. Several novel methods employed, including diver‐directed trap‐net...
Abstract Lake surface temperatures are warming in many regions and have the potential to alter seasonal thermal stratification. However, effects of climate change on stratification can be difficult characterize because trends regulated by changes multiple variables other characteristics, such as water clarity. Here, we use long‐term (1993–2017) data from near‐pristine Crater (Oregon) understand depth strength summer stratification, measured center buoyancy Schmidt Stability, respectively....
Abstract Diel vertical movement (DVM) is a widespread behavior in aquatic ecosystems, occurring across variety of taxa and water bodies. The factors hypothesized to drive DVM can vary tremendously through time, yet little known about how changes at interannual timescales. Here we explore cyclical prey abundance affects predator DVM. Higher consumption levels increase the optimal temperatures for growth fishes. Thus, annual variation should generate corresponding depths selected during In...
Abstract The intensity and frequency of storms are projected to increase in many regions the world because climate change. Storms can alter environmental conditions ecosystems. In lakes reservoirs, reduce epilimnetic temperatures from wind‐induced mixing with colder hypolimnetic waters, direct precipitation lake's surface, watershed runoff. We analyzed 18 long‐term high‐frequency lake datasets 11 countries assess magnitude wind‐ vs. rainstorm‐induced changes temperature. found small...
Abstract Chlorophyll a is commonly used as surrogate for algal biomass in lakes and oceans even though phytoplankton can readily adjust intracellular chlorophyll concentration to changes the environment through cellular process termed photoacclimation. Marine studies have documented fluctuations year‐round light intensity nutrients using : carbon ratio estimate pigment density. However, similar freshwater are almost exclusively limited ratios at summertime deep maximum (DCM) depth less...
Climate change and other anthropogenic stressors have led to long-term changes in the thermal structure, including surface temperatures, deepwater vertical gradients, many lakes around world. Though studies highlight warming of water temperatures worldwide, less is known about trends full structure which been changing consistently both direction magnitude. Here, we present a globally-expansive data set summertime in-situ temperature profiles from 153 lakes, with one time series beginning as...
Abstract Chlorophyll measurements are commonly used to estimate phytoplankton biomass. However, readily acclimate variations in light through a range of phenotypic responses, including major adjustments chlorophyll pigmentation at the cellular level. The ratio pigment carbon concentration (Chl:C) is metric oceanographic community explore photoacclimation responses varied levels, yet relatively rare freshwater studies. Here we how nutrient variability impacted summertime Chl:C ratios natural...
Abstract Some biological invasions can result in algae blooms the nearshore of clear lakes. We studied if an invasive crayfish ( Pacifastacus leniusculus ) modified biomass and community composition benthic macroinvertebrates therefore led to a trophic cascade resulting increased periphyton biomass, elevated littoral primary productivity, bloom lake with remarkable transparency [Crater Lake, Oregon, USA]. After quantifying changes spatial distribution over 13-year period, we compared...
First posted May 4, 2016 For additional information, contact: Director, Oregon Water Science CenterU.S. Geological Survey2130 SW 5th AvenuePortland, 97201http://or.water.usgs.gov The frequency of deep ventilation events in Crater Lake, a caldera lake the Cascade Mountains, was simulated six future climate scenarios, using 1-dimensional model (1DDV) that developed to simulate water initiated by reverse stratification and subsequent thermobaric instability. calibrated validated with...
Vertical profiles of temperature, salinity and dissolved oxygen in Crater Lake, a caldera lake the Oregon Cascade Range that receives hydrothermal inputs heat salt, were simulated with 1-dimensional model. Twelve Global Circulation Models two Representative Concentration Pathways (RCPs) used to develop boundary conditions from 1950 2099. The model ventilation deep water initiated by reverse stratification subsequent thermobaric instability. All models predicted reduction frequency events, an...
Journal Article Effects of hydrology on zooplankton communities in high-mountain ponds, Mount Rainier National Park, USA Get access Scott F. Girdner, Girdner 1Present address: Crater Lake ParkCrater Lake, OR 97604, Search for other works by this author on: Oxford Academic Google Scholar Gary L. Larson Plankton Research, Volume 17, Issue 9, September 1995, Pages 1731–1755, https://doi.org/10.1093/plankt/17.9.1731 Published: 01 1995 history Received: 22 1994 Accepted: 29 April
Relative to their scarcity, large, deep lakes support a large proportion of the world's freshwater species. This biodiversity is threatened by human development and in need conservation. Direct comparison basis biological monitoring for conservation but difficult conduct between insular ecosystems. The objective our study was such benthic three largest lakes: Lake Tahoe, USA; Hövsgöl, Mongolia; Crater Lake, USA. We examined common organism, non-biting midges (Chironomidae) determined lake...
Traditionally, multibeam data have been used to map sea floor or lake morphology as well the distribution of surficial facies in order characterize geologic component benthic habitats. In addition using for studies, we want determine if these can also be directly biota. Multibeam bathymetry and acoustic backscatter collected Crater Lake, Oregon, 2000 are a deep-water bryophyte mat, which will extremely useful understanding overall ecology lake. To bryophyte's distribution, depth range,...