Publications
USGS research activities relevant to Alaska have yielded more than 9400 historical publications. This page features some of the most recent newsworthy research findings.
Filter Total Items: 3090
Biogeochemical processes that produce dissolved organic matter from wheat straw Biogeochemical processes that produce dissolved organic matter from wheat straw
The chemical reactions that lead to the formation of dissolved organic matter (DOM) in natural waters are poorly understood. Studies on the formation of DOM generally are complicated because almost all DOM isolates have been derived from mixtures of plant species composed of a wide variety of different types of precursor compounds for DOM formation. This report describes a study of DOM...
Authors
Robert L. Wershaw, David W. Rutherford, Jerry A. Leenheer, Kay R. Kennedy, Larry G. Cox, Donald R. Koci
Variability of the seasonally integrated normalized difference vegetation index across the north slope of Alaska in the 1990s Variability of the seasonally integrated normalized difference vegetation index across the north slope of Alaska in the 1990s
The interannual variability and trend of above-ground photosynthetic activity of Arctic tundra vegetation in the 1990s is examined for the north slope region of Alaska, based on the seasonally integrated normalized difference vegetation index (SINDVI) derived from local area coverage (LAC) National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer...
Authors
D. Stow, Scott Daeschner, A. Hope, David C. Douglas, A. Petersen, Ranga B. Myneni, L. Zhou, W. Oechel
Effect of analytical conditions in wavelength dispersive electron microprobe analysis on the measurement of strontium-to-calcium (Sr/Ca) ratios in otoliths of anadromous salmonids Effect of analytical conditions in wavelength dispersive electron microprobe analysis on the measurement of strontium-to-calcium (Sr/Ca) ratios in otoliths of anadromous salmonids
The use of strontium-to-calcium (Sr/Ca) ratios in otoliths is becoming a standard method to describe life history type and the chronology of migrations between freshwater and seawater habitats in teleosts (e.g. Kalish, 1990; Radtke et al., 1990; Secor, 1992; Rieman et al., 1994; Radtke, 1995; Limburg, 1995; Tzeng et al. 1997; Volk et al., 2000; Zimmerman, 2000; Zimmerman and Reeves, 2000...
Authors
Christian E. Zimmerman, Roger L. Nielsen
Metamorphism within the Chugach accretionary complex on southern Baranof Island, southeastern Alaska Metamorphism within the Chugach accretionary complex on southern Baranof Island, southeastern Alaska
On Baranof Island, southeastern Alaska, we identify four metamorphic events that affect rocks associated with the Chugach accretionary complex. This study focuses on the M1 and M4 metamorphic events. Mesozoic schists, gneisses, and migmatitic gneisses exposed near the Kasnyku pluton on central Baranof Island represent the M1 metamorphic rocks. These rocks underwent amphibolite facies...
Authors
Cathy L. Zumsteg, Glen R. Himmelberg, Susan M. Karl, Peter J. Haeussler
Canada Goose (Branta canadensis) Canada Goose (Branta canadensis)
No abstract available
Authors
Thomas B. Mowbray, James S. Sedinger, Robert E. Trost
Bristle-thighed Curlew (Numenius tahitiensis) Bristle-thighed Curlew (Numenius tahitiensis)
No abstract available
Authors
J.S. Marks, T. Lee Tibbitts, Robert E. Gill, Brian J. McCaffery
Sea otter (Enhydra lutris) perspective: Part C. Trophic linkages among sea otters and bivalve prey in Prince William Sound, Alaska, in the aftermath of the Exxon Valdez oil spill: Implications for community models in sedimentary habitats Sea otter (Enhydra lutris) perspective: Part C. Trophic linkages among sea otters and bivalve prey in Prince William Sound, Alaska, in the aftermath of the Exxon Valdez oil spill: Implications for community models in sedimentary habitats
We exploited the Exxon Valdez oil spill in Prince William Sound (PWS), Alaska, to evaluate effects of reduced sea otter densities on prey populations in sedimentary habitats. We considered the need for and characteristics of new models for trophic effects of sea otters on coastal marine benthic communities. We viewed evidence for nonlinear or uncertain patterns of prey response to...
Authors
Glenn R. VanBlaricom, Allan K. Fukuyama, Charles E. O’Clair, Daniel H. Monson, Stephen C. Jewett, Tamara K. Gage, Thomas A. Dean, James L. Bodkin
Sea otter (Enhydra lutris) perspective: Part B. Food limitation and the recovery of sea otters following the Exxon Valdez oil spill Sea otter (Enhydra lutris) perspective: Part B. Food limitation and the recovery of sea otters following the Exxon Valdez oil spill
We examined the potential role of food limitation in constraining recovery of sea otters in Prince William Sound, Alaska, following the Exxon Valdez oil spill. The spill resulted in the removal of a large number of sea otters in 1989, and as of 1998, the portion of the population in the heavily oiled northern Knight Island region had not fully recovered. Between 1996 and 1998, prey...
Authors
Thomas A. Dean, James L. Bodkin, Allan K. Fukuyama, Stephen C. Jewett, Daniel H. Monson, Charles E. O’Clair, Glenn R. VanBlaricom
Tufted Puffin (Fratercula cirrhata) Tufted Puffin (Fratercula cirrhata)
No abstract available
Authors
John F. Piatt, Alexander S. Kitaysky
Horned Puffin (Fratercula corniculata) Horned Puffin (Fratercula corniculata)
No abstract available
Authors
John F. Piatt, Alexander S. Kitaysky
Rock Sandpiper (Calidris ptilocnemis) Rock Sandpiper (Calidris ptilocnemis)
No abstract available
Authors
Robert E. Gill, Pavel S. Tomkovich, Brian J. McCaffery
Wandering Tattler (Tringa incana) Wandering Tattler (Tringa incana)
No abstract available
Authors
Robert E. Gill, Brian J. McCaffery, Pavel S. Tomkovich