Skip to main content
Advanced Search

Filters: Tags: Diatom (X)

6 results (43ms)   

View Results as: JSON ATOM CSV
thumbnail
CalHABMAP provides updates on current algal blooms and facilitates information exchange among HAB researchers, managers and the general public in California. A major component of this program is regional HAB monitoring. Water samples and net tows are collected once per week to monitor for HAB species and naturally occurring algal toxins. Water quality data including temperature, salinity, and nutrients are also collected.
Didymosphenia geminata (didymo) is a freshwater alga native to North America, including Glacier National Park, Montana. It has long been considered a cold-water species, but has recently spread to lower latitudes and warmer waters, and increasingly forms large blooms that cover streambeds. We used a comprehensive monitoring data set from the National Park Service (NPS) and USGS models of stream temperatures to explore the drivers of didymo abundance in Glacier National Park. We estimate that approximately 64% of the stream length in the park contains didymo, with around 5% in a bloom state. Results suggest that didymo abundance likely increased over the study period (2007–2009), with blooms becoming more common....
thumbnail
This Data Release makes available measurements of phytoplankton species composition, abundance and cell size made on samples collected in San Francisco Bay (CA) from April 1992 through March 2014. Phytoplankton samples were collected at 31 stations along a 145-km transect where the variability of salinity, temperature, turbidity and nutrient concentrations reflected a broad range of environmental factors that regulate phytoplankton growth and abundance (map of sampling locations is available on the project website at: https://sfbay.wr.usgs.gov/access/wqdata/overview/wherewhen/stnmap.html). Whole water samples were preserved with acid Lugol’s solution, and 2 to 50 ml aliquots were settled in chambers for 6 to 24...
Diatom assemblages in sediments from two subalpine lakes in the Uinta Mountains, Utah, show asynchronous changes that are related to both anthropogenic and natural inputs of dust. These lakes are downwind of sources of atmospheric inputs originating from mining, industrial, urban, agricultural and natural sources that are distributed within tens to hundreds of kilometers west and south of the Uinta Mountains. Sediment cores were retrieved from Marshall and Hidden lakes to determine the impacts of atmospheric pollution, especially metals. Paleolimnological techniques, including elemental analyses and 210Pb and 239+240Pu dating, indicate that both lakes began receiving eolian inputs from anthropogenic sources in the...
thumbnail
This Data Release makes available measurements of phytoplankton species composition, abundance and cell size made on samples collected in San Francisco Bay (CA) from January 2014 through December 2018. Whole water phytoplankton samples were collected at least monthly at fixed sampling stations along a 145-km transect where the variability of salinity, temperature, turbidity and nutrient concentrations reflected a broad range of environmental factors that regulate phytoplankton growth and abundance. A map and table of sampling locations are included in this Data Release. Immediately after samples were collected, they were preserved with acid Lugol’s solution. The samples were analyzed by BSA Environmental Services,...
thumbnail
The data contained in this report represent our preliminary findingsof the analyses of two cores of Pliocene and early Pleistocenesediments from the eastern Great Basin. This is a collaborativeproject involving specialists from the USGS, Kansas State University,and the University of California-Davis in paleontology (Thompson,Buchner, Forester, Bradbury), stratigraphy and sedimentology (Oviatt,Kelsey, Bracht), and paleomagnetism and environmental magnetism(Roberts).


    map background search result map search result map Stratigraphy, Sedimentology, Paleontology, and Paleomagnetism ofPliocene-Early Pleistocene Lacustrine Deposits in Two Cores fromWestern Utah Harmful Algal Bloom (HAB) data collected by the Scripps Institution of Oceanography and made available by the Southern California Coastal Observing System (SCCOOS) Stratigraphy, Sedimentology, Paleontology, and Paleomagnetism ofPliocene-Early Pleistocene Lacustrine Deposits in Two Cores fromWestern Utah Harmful Algal Bloom (HAB) data collected by the Scripps Institution of Oceanography and made available by the Southern California Coastal Observing System (SCCOOS)