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Filter Total Items: 612
Year Published: 2005

Ecological structure of salt ponds, San Francisco Bay, California: Balancing tidal wetland restoration with existing beneficial habitat

No abstract available.

Miles, A.K.; Takekawa, John Y.; Schoellhamer, D.H.; Athearn, N.D.; Saiki, M.K.; Duffy, W.D.; Kleinschmidt, S.; Shellenbarger, G.G.; Jannusch, C.A.; Spring, S.E.
Miles, A.K., Takekawa, J.Y., Schoellhamer, D.H., Athearn, N.D., Saiki, M.K., Duffy, W.D., Kleinschmidt, S., Shellenbarger, G.G., Jannusch, C.A., Spring, S.E., 2005, Ecological structure of salt ponds, San Francisco Bay, California: balancing tidal wetland restoration with existing beneficial habitat, The American Society of Limnology and Oceanography Aquatic Sciences Meeting 2005, Salt Lake City, UT., February 21, 2005

Year Published: 2005

Estimating sediment budgets at the interface between rivers and estuaries with application to the Sacramento-San Joaquin River Delta

Where rivers encounter estuaries, a transition zone develops where riverine and tidal processes both affect sediment transport processes. One such transition zone is the Sacramento‐San Joaquin River Delta, a large, complex system where several rivers meet to form an estuary (San Francisco Bay). Herein we present the results of a detailed sediment...

Wright, Scott A.; Schoellhamer, David H.
Estimating sediment budgets at the interface between rivers and estuaries with application to the Sacramento-San Joaquin River Delta; 2005; Article; Journal; Water Resources Research; Wright, S. A.; Schoellhamer, D. H.

Year Published: 2005

How snowpack heterogeneity affects diurnal streamflow timing

Diurnal cycles of streamflow in snow‐fed rivers can be used to infer the average time a water parcel spends in transit from the top of the snowpack to a stream gauge in the river channel. This travel time, which is measured as the difference between the hour of peak snowmelt in the afternoon and the hour of maximum discharge each day, ranges from...

Lundquist, J.D.; Dettinger, M.D.
How snowpack heterogeneity affects diurnal streamflow timing; 2005; Article; Journal; Water Resources Research; Lundquist, J. D.; Dettinger, M. D.

Year Published: 2005

One estuary, one invasion, two responses: phytoplankton and benthic community dynamics determine the effect of an estuarine invasive suspension-feeder

No abstract available.

Dame, Richard F.; Olenin, Sergej; Thompson, Janet K.
Attribution: Pacific

Year Published: 2005

Phytoplankton community ecology: Principles applied in San Francisco Bay

In his seminal 1961 paper 'The paradox of the plankton' Am Nat 95:137-147, G. E. Hutchinson asked why many species of phytoplankton can coexist while competing for a small number of limiting resources in an unstructured habitat. Hutchinson anticipated the resolution of his paradox, recognizing that communities are organized by processes beyond...

Cloern, J.E.; Dufford, R.
Phytoplankton community ecology: Principles applied in San Francisco Bay; 2005; Article; Journal; Marine Ecology Progress Series; Cloern, J. E.; Dufford, R.

Year Published: 2005

Potential degradation of water quality by bird feces in and around managed wetlands

No abstract available.

Shellenbarger, G.G.; Boehm, A.B.
Attribution: Pacific

Year Published: 2005

Snow-fed streamflow timing at different basin scales: Case study of the Tuolumne River above Hetch Hetchy, Yosemite, California

Diurnal cycles in snow‐fed streams provide a useful technique for measuring the time it takes water to travel from the top of the snowpack, where snowmelt typically peaks in the afternoon, to the river gauge, where the daily maximum flows may arrive many hours later. Hourly stage measurements in nested subbasins (6‐775 km2) of the Tuolumne River...

Lundquist, J.D.; Dettinger, M.D.; Cayan, D.R.
Snow-fed streamflow timing at different basin scales: Case study of the Tuolumne River above Hetch Hetchy, Yosemite, California; 2005; Article; Journal; Water Resources Research; Lundquist, J. D.; Dettinger, M. D.; Cayan, D. R.

Year Published: 2005

Specific conductance and water temperature data for San Francisco Bay, California, for Water Year 2004

This article presents time-series graphs of specificconductance and water-temperature data collected in San Francisco Bay during water year 2004 (October 1, 2003, through September 30, 2004). Specific-conductance and water-temperature data were recorded at 15-minute intervals at seven U.S. Geological Survey (USGS) locations (Figure 1, Table 1)....

Buchanan, P.A.
Attribution: Pacific

Year Published: 2005

Tools for assessing landscape-scale habitat changes in wetland restoration planning

No abstract available.

Orr, M.; May, C.; Williams, P.; Lionberger, M.; Schoellhamer, D.; Rottenborn, S.; Duke, R.; Stralberg, D.; Herzog, M.; Ritchie, S.
Attribution: Pacific

Year Published: 2005

Trophic transfer of metals along freshwater food webs: Evidence of cadmium biomagnification in nature

We conducted a study with cadmium (Cd) and copper (Cu) in the delta of San Francisco Bay, using nitrogen and carbon stable isotopes to identify trophic position and food web structure. Cadmium is progressively enriched among trophic levels in discrete epiphyte‐based food webs composed of macrophyte‐dwelling invertebrates (the first link being...

Croteau, M.-N.; Luoma, S.N.; Stewart, A.R.
Croteau Marie‐Noële , Luoma Samuel N. , Stewart A. Robin , (2005), Trophic transfer of metals along freshwater food webs: Evidence of cadmium biomagnification in nature, Limnology and Oceanography, 5, doi: 10.4319/lo.2005.50.5.1511.

Year Published: 2004

Science support for salt pond restoration and management in south San Francisco Bay

Swanson, Kathleen M.; Shellenbarger, Gregory; Henderson, Kathleen D.; DiLeo, Jeanne S.; Schoellhamer, David H.
Science support for salt pond restoration and management in south San Francisco Bay; 2004; FS; 2004-3135; Swanson, Kathleen M.; Shellenbarger, Gregory G.; Henderson, Kathleen D.; DiLeo, Jeanne S.; Schoellhamer, David H.

Year Published: 2004

Sediment remobilization of Mercury in South San Francisco Bay, California

Topping, Brent R.; Kuwabara, James S.; Marvin-DisPasquale, Mark C.; Agee, Jennifer L.; Kieu, Le H.; Flanders, John R.; Parcheso, Francis; Hager, Stephen W.; Lopez, Cary B.; Krabbenhoft, David P.
Attribution: Pacific
Sediment remobilization of Mercury in South San Francisco Bay, California; 2004; SIR; 2004-5196; Topping, Brent R.; Kuwabara, James S.; Marvin-DisPasquale, Mark C.; Agee, Jennifer L.; Kieu, Le H.; Flanders, John R.; Parchaso, Francis; Hager, Stephen W.; Lopez, Cary B.; Krabbenhoft, David P.

Filter Total Items: 222
Alaska field team
June 5, 2016

Alaska field team

The field team included USGS geologists Rob Witter, Adrian Bender, Chris DuRoss, Peter Haeussler, Richard Lease and Kate Scharer

May 31, 2016

Breaking Down Reefs, Building Up Beaches

On the remote western coast of Australia lies a UNESCO World Heritage Site above and below the sea. Researchers from the U.S. Geological Survey and University of Western Australia convened here at Ningaloo Reef and Jurabi Coastal Reserve to embark on the most extensive study EVER done into how coral reefs shape our coasts.
 

May 20, 2016

Shaking of Frontier Building — Anchorage, Alaska, During Mw7.1 Earthquake, January 24, 2016

This video presents a visualization of shaking that was recorded in the Frontier Building in Anchorage, Alaska, during the Mw7.1 earthquake, January 24, 2016, Iniskin, Alaska. It exhibits how a tall building behaves and performs during strong earthquake shaking. Note that relative to the height of the building, the motions are magnified by a factor of 300 to show

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USGS scientist Jackson Currie navigates a personal water craft through waves, collecting bathymetric data in Monterey, CA
March 24, 2016

Collecting Bathymetric Data

Physical scientist Jackson Currie steers a personal water craft (PWC) equipped with GPS and echo sounder through the waves of the nearshore area of Zmudowski State Beach in Moss Landing, California. The data collected is used to generate bathymetric maps, or maps of what the nearshore environment looks like underwater. Gathering this type of information helps USGS

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A Spawning Coho Salmon
December 31, 2015

A Spawning Coho Salmon

Coho salmon fins just above water surface. Female coho select breeding sties based on specific characteristics that offer protection and desired habitat for juveniles. Photo courtesy of Steven Clark, BLM

A repeating loop showing a hammer scooping lava from a flow and dropping it into a bucket.
September 28, 2015

Lava Sampling

This is an animated GIF, taken from a longer video, showing the moment that this geologist from the Hawaiian Volcano Observatory (HVO) scoops up lava from an active flow and drops it into a bucket of water to cool it down. 

Man untangling a little red bird from a net.
August 31, 2015

iwi in net

Adult Iiwi being removed from a mist net which was used to capture the bird for banding

A little red bird being handled by scientist
August 31, 2015

Iiwi banded at Hakalau 1

Adult Iiwi being banded at Hakalau Forest National Wildlife Refuge, Hawaii

May 2, 2015

Mojave Golden Eagles

This short video features incredible and graphic images and video of golden eagle prey. These birds are eating machines. USGS biologist-rock climbers install nest cameras to study the eating habits of golden eagles and their young in the Mojave Desert. This work goes towards creating a Prey Availability Habitat Model to better site green energy projects so that they will

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March 31, 2015

Exploring Causes of Coral Disease

The Hawaiian Islands’ beautiful ocean and beaches attract more than 8.5 million tourists each year. The USGS aims to help Hawaii preserve its underwater natural resources by tracing how oceanography may influence coral disease outbreaks. Looking into contaminants in the freshwater, or how quickly a bay may or may not flush, will help enrich future and past studies about

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Male Laysan duck on water
December 31, 2014

Male Laysan duck (Anas laysanensis) at Midway Atoll

Male Laysan duck (Anas Laysanensis) at Midway Atoll, Hawai‘i

Nine USGS Science Centers are administered by the Pacific Regional office, which is headquartered in Sacramento, California.

The Pacific Region works with a wide array of partners across the country, including other Federal and state agencies, regional and local governments, academic institutions, research organizations, non-governmental organizations, and more.

Filter Total Items: 76