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Pacific

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Filter Total Items: 612
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Year Published: 2002

A comment on the use of flushing time, residence time, and age as transport time scales

Applications of transport time scales are pervasive in biological, hydrologic, and geochemical studies yet these times scales are not consistently defined and applied with rigor in the literature. We compare three transport time scales (flushing time, age, and residence time) commonly used to measure the retention of water or scalar quantities...

Monsen, Nancy E.; Cloern, James E.; Lucas, Lisa V.; Monismith, Stephen G.

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Year Published: 2002

Bioavailability of organic matter in a highly disturbed Estuary: The role of detrital and algal resources

The importance of algal and detrital food supplies to the planktonic food web of a highly disturbed, estuarine ecosystem was evaluated in response to declining zooplankton and fish populations. We assessed organic matter bioavailability among a diversity of habitats and hydrologic inputs over 2 years in San Francisco Estuary's Sacramento-San...

Sobczak, W.V.; Cloern, J.E.; Jassby, A.D.; Muller-Solger, A. B.
Bioavailability of organic matter in a highly disturbed Estuary: The role of detrital and algal resources; 2002; Article; Journal; Proceedings of the National Academy of Sciences of the United States of America; Sobczak, W. V.; Cloern, J. E.; Jassby, A. D.; Muller-Solger, A. B.

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Year Published: 2002

Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration

Suspended sediment concentration (SSC) data from San Pablo Bay, California, were analyzed to compare the basin-scale effect of dredging and disposal of dredged material (dredging operations) and natural estuarine processes. The analysis used twelve 3-wk to 5-wk periods of mid-depth and near-bottom SSC data collected at Point San Pablo every 15 min...

Schoellhamer, D.H.
Attribution: Pacific
Comparison of the basin-scale effect of dredging operations and natural estuarine processes on suspended sediment concentration; 2002; Article; Journal; Estuaries; Schoellhamer, D. H.

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Year Published: 2002

Continuous monitoring of suspended sediment in rivers by use of optical backscatterance sensors

No abstract available.

Schoellhamer, D.H.; Wright, S.A.
Attribution: Pacific

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Year Published: 2002

Effects of mosquito larvicide on mallard ducklings and prey

We determined the effects of a commonly used mosquito (Culicidae) larvicide (California Golden Bear Oil??, also GB-1111) on body mass and survival of mallard (Anas platyrhynchos) ducklings and on target and nontarget invertebrates. Field studies conducted on natural ponds located in salt marshes in south San Francisco Bay indicated that GB-1111...

Miles, A.K.; Lawler, S.P.; Dritz, D.; Spring, S.
Attribution: Pacific
Effects of mosquito larvicide on mallard ducklings and prey; 2002; Article; Journal; Wildlife Society Bulletin; Miles, A. K.; Lawler, S. P.; Dritz, D.; Spring, S.

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Year Published: 2002

Effects of tidal current phase at the junction of two straits

Estuaries typically have a monotonic increase in salinity from freshwater at the head of the estuary to ocean water at the mouth, creating a consistent direction for the longitudinal baroclinic pressure gradient. However, Mare Island Strait in San Francisco Bay has a local salinity minimum created by the phasing of the currents at the junction of...

Warner, John C.; Schoellhamer, David H.; Burau, Jon; Schladow, Geoffrey
Effects of tidal current phase at the junction of two straits; 2002; Conference Paper; Continental Shelf Research; Warner, J.; Schoellhamer, D.; Burau, J.; Schladow, G.

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Year Published: 2002

Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study

Processes influencing estuarine phytoplankton growth occur over a range of time scales, but many conceptual and numerical models of estuarine phytoplankton production dynamics neglect mechanisms occurring on the shorter (e.g., intratidal) time scales. We used a numerical model to explore the influence of short time-scale variability in...

Lucas, L.V.; Cloern, J.E.
Effects of tidal shallowing and deepening on phytoplankton production dynamics: A modeling study; 2002; Article; Journal; Estuaries; Lucas, L. V.; Cloern, J. E.

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Year Published: 2002

Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications

We have now entered an era of large-scale attempts to restore ecological functions and biological communities in impaired ecosystems. Our knowledge base of complex ecosystems and interrelated functions is limited, so the outcomes of specific restoration actions are highly uncertain. One approach for exploring that uncertainty and anticipating the...

Lucas, L.V.; Cloern, J.E.; Thompson, J.K.; Monsen, N.E.
Functional variability of habitats within the Sacramento-San Joaquin Delta: Restoration implications; 2002; Article; Journal; Ecological Applications; Lucas, L. V.; Cloern, J. E.; Thompson, J. K.; Monsen, N. E.

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Year Published: 2002

Influence of hydrologic processes on reproduction of the introduced bivalve Potamocorbula amurensis in northern San Francisco Bay, California

Monthly censusing of reproductive condition of the Asian clam Potamocorbula amurensis at four sites in northern San Francisco Bay over a 9-yr period revealed year-to-year differences in local reproductive activity that are associated with patterns of hydrologic variability. Between 1989 and 1992, Northern California experienced a drought, whereas...

Parchaso, F.; Thompson, J.K.
Attribution: Pacific
Influence of hydrologic processes on reproduction of the introduced bivalve Potamocorbula amurensis in northern San Francisco Bay, California; 2002; Article; Journal; Pacific Science; Parchaso, F.; Thompson, J. K.

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Year Published: 2002

Long-term benthic community change in a highly invaded estuary

No abstract available.

Peterson, H. A.
Attribution: Pacific

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Year Published: 2002

Primary modes and predictability of year-to-year snowpack variations in the Western United States from teleconnections with Pacific Ocean climate

Snowpack, as measured on 1 April, is the primary source of warm-season streamflow for most of the western United States and thus represents an important source of water supply. An understanding of climate factors that influence the variability of this water supply and thus its predictability is important for water resource management. In this...

McCabe, G.J.; Dettinger, M.D.
Primary modes and predictability of year-to-year snowpack variations in the Western United States from teleconnections with Pacific Ocean climate; 2002; Article; Journal; Journal of Hydrometeorology; McCabe, G. J.; Dettinger, M. D.

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Year Published: 2002

Stable carbon and nitrogen isotope composition of aquatic and terrestrial plants of the San Francisco Bay estuarine system

We report measurements of seasonal variability in the C‐N stable isotope ratios of plants collected across the habitat mosaic of San Francisco Bay, its marshes, and its tributary river system. Analyses of 868 plant samples were binned into 10 groups (e.g., terrestrial riparian, freshwater phytoplankton, salt marsh) to determine whether C‐N...

Cloern, J.E.; Canuel, E.A.; Harris, D.
Stable carbon and nitrogen isotope composition of aquatic and terrestrial plants of the San Francisco Bay estuarine system; 2002; Article; Journal; Limnology and Oceanography; Cloern, J. E.; Canuel, E. A.; Harris, D.

Filter Total Items: 223
Image: Great Egret
November 19, 2008

Great Egret

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Pacific
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Pacific
Image: Snow Geese
November 19, 2008

Snow Geese

Birds found in and around the the Sonny Bono Refuge in southern Salton Sea, California.

Attribution: Pacific
Image: Dowitcher Feeding
November 19, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: Dowitcher Feeding
November 19, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Stream Gage on the eastern bank of the Salton Sea now sits out of the water due to retreating shoreline.
November 3, 2008

Stream Gage sits high and dry on the eastern shore of the Salton Sea

Stream gage #10254005 located near Westmorland, CA, on the eastern shore of the Salton Sea, now sits out of the water as the Salton Sea continues to evaporate and the shoreline retreats.

Image: American Avocet
July 18, 2008

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: Dowitcher
July 18, 2008

Dowitcher

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: Dowitcher Feeding
July 18, 2008

Dowitcher Feeding

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: Salton Sea Birds
July 18, 2008

Salton Sea Birds

Birds found in and around the Salton Sea, California.

Attribution: Pacific
Image: American Avocet
July 18, 2008

American Avocet

Birds found in and around the Salton Sea, California.

Attribution: Pacific

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