A. Keith Miles (Former Employee)
Science and Products
Filter Total Items: 111
Sources of organochlorine contaminants and mercury in seabirds from the Aleutian archipelago of Alaska: Inferences from spatial and trophic variation
Persistent organochlorine compounds and mercury (Hg) have been detected in numerous coastal organisms of the Aleutian archipelago of Alaska, yet sources of these contaminants are unclear. We collected glaucous-winged gulls, northern fulmars, and tufted puffins along a natural longitudinal gradient across the western and central Aleutian Islands (Buldir, Kiska, Amchitka, Adak), and an additional 8
Authors
Mark A. Ricca, A. Keith Miles, Robert G. Anthony
Modeling the effects of fire severity and spatial complexity on Small Mammals in Yosemite National Park, California
We evaluated the impact of fire severity and related spatial and vegetative parameters on small mammal populations in 2 yr- to 15 yr-old burns in Yosemite National Park, California, USA. We also developed habitat models that would predict small mammal responses to fires of differing severity. We hypothesized that fire severity would influence the abundances of small mammals through changes in vege
Authors
Susan L. Roberts, Jan W. Van Wagtendonk, A. Keith Miles, Douglas A. Kelt, James A. Lutz
Mercury concentrations and space use of pre-breeding American avocets and black-necked stilts in San Francisco Bay
We examined factors influencing mercury concentrations in pre-breeding American avocets (Recurvirostra americana) and black-necked stilts (Himantopus mexicanus), the two most abundant breeding shorebirds in San Francisco Bay, California. We tested the effects of species, site, sex, year, and date on total mercury concentrations in blood of pre-breeding adult birds and used radio telemetry to deter
Authors
Joshua T. Ackerman, Collin A. Eagles-Smith, John Y. Takekawa, Scott A. Demers, Terrence L. Adelsbach, J.D. Bluso, A. Keith Miles, Nils Warnock, Thomas H. Suchanek, Steven E. Schwarzbach
Polycyclic aromatic hydrocarbon exposure in Steller's eiders (Polysticta stelleri) and harlequin ducks (Histronicus histronicus) in the Eastern Aleutian Islands, Alaska, USA
Seaducks may be affected by harmful levels of polycyclic aromatic hydrocarbons (PAHs) at seaports near the Arctic. As an indicator of exposure to PAHs, we measured hepatic enzyme 7-ethoxyresorufin-O-deethylase activity (EROD) to determine cytochrome P4501A induction in Steller's eiders (Polysticta stelleri) and Harlequin ducks (Histronicus histronicus) from Unalaska, Popof, and Unga Islands (AK, U
Authors
A.K. Miles, Paul L. Flint, K.A. Trust, M.A. Ricca, S.E. Spring, D.E. Arrieta, T. Hollmen, B.W. Wilson
Spatial and temporal structure of macroinvertebrate assemblages, San Francisco Bay salt ponds
No abstract available.
Authors
A.K. Miles, S.E. Spring, M.A. Ricca, J.T. Takekawa, N.D. Athearn, D. H. Schoellhamer
Mercury in sediments, Alviso and Eden Landing salt ponds, south San Francisco Bay, California
No abstract available.
Authors
A.K. Miles, M.A. Ricca, S.E. Spring, C. Morris, C. Wilcox, T. Maurer
Environmental contaminants in bald eagle eggs from the Aleutian archipelago
We collected 136 fresh and unhatched eggs from bald eagle (Haliaeetus leucocephalus) nests and assessed productivity on eight islands in the Aleutian archipelago, 2000 to 2002. Egg contents were analyzed for a broad spectrum of organochlorine (OC) contaminants, mercury (Hg), and stable isotopes of carbon (??13C) and nitrogen (??15N). Concentrations of polychlorinated biphenyls (??PCBs), p,p???- di
Authors
R.G. Anthony, A.K. Miles, M.A. Ricca, J. A. Estes
Effect of lipid extraction on analyses of stable carbon and stable nitrogen isotopes in coastal organisms of the Aleutian archipelago
We tested whether extracting lipids reduced confounding variation in ??13C and ??15N values by analyzing paired lipid-extracted (LE) and non-lipid-extracted (NLE) samples of bald eagle (Haliaeetus leucocephalus (L., 1766)) whole eggs, muscle tissue from nine seabird and one terrestrial bird species, muscle tissue from four marine fish species, and blue mussels (Mytilus edulis L., 1758) collected f
Authors
M.A. Ricca, A.K. Miles, R.G. Anthony, X. Deng, S. S. O. Hung
Differential gene expression induced by exposure of captive mink to fuel oil: A model for the sea otter
Free-ranging sea otters are subject to hydrocarbon exposure from a variety of sources, both natural and anthropogenic. Effects of direct exposure to unrefined crude oil, such as that associated with the Exxon Valdez oil spill, are readily apparent. However, the impact of subtle but pathophysiologically relevant concentrations of crude oil on sea otters is difficult to assess. The present study was
Authors
Lizabeth Bowen, F. Riva, C. Mohr, B. Aldridge, J. Schwartz, A. Keith Miles, J.L. Stott
Diets of introduced predators using stable isotopes and stomach contents
In a study of predation on ground-nesting birds at South San Francisco Bay (South Bay), California, USA, we analyzed stomach contents and stable isotopes of carbon and nitrogen to identify commonly consumed prey. We obtained the stomach contents from 206 nonnative red foxes (Vulpes vulpes regalis) collected in the South Bay area and Monterey County during 1995-2001 and from 68 feral cats (Felis si
Authors
A.M. Meckstroth, A.K. Miles, S. Chandra
Trophic structure and avian communities across a salinity gradient in evaporation ponds of the San Francisco Bay estuary
Commercial salt evaporation ponds comprise a large proportion of baylands adjacent to the San Francisco Bay, a highly urbanized estuary. In the past two centuries, more than 79% of the historic tidal wetlands in this estuary have been lost. Resource management agencies have acquired more than 10 000 ha of commercial salt ponds with plans to undertake one of the largest wetland restoration projects
Authors
John Y. Takekawa, A.K. Miles, D. H. Schoellhamer, N.D. Athearn, M. K. Saiki, W.D. Duffy, S. Kleinschmidt, G.G. Shellenbarger, C.A. Jannusch
Expressed MHC class II genes in sea otters (Enhydra lutris) from geographically disparate populations
The major histocompatibility complex (MHC) is central to maintaining the immunologic vigor of individuals and populations. Classical MHC class II genes were targeted for partial sequencing in sea otters (Enhydra lutris) from populations in California, Washington, and Alaska. Sequences derived from sea otter peripheral blood leukocyte mRNAs were similar to those classified as DQA, DQB, DRA, and DRB
Authors
Lizabeth Bowen, B.M. Aldridge, A. Keith Miles, J.L. Stott
Science and Products
Filter Total Items: 111
Sources of organochlorine contaminants and mercury in seabirds from the Aleutian archipelago of Alaska: Inferences from spatial and trophic variation
Persistent organochlorine compounds and mercury (Hg) have been detected in numerous coastal organisms of the Aleutian archipelago of Alaska, yet sources of these contaminants are unclear. We collected glaucous-winged gulls, northern fulmars, and tufted puffins along a natural longitudinal gradient across the western and central Aleutian Islands (Buldir, Kiska, Amchitka, Adak), and an additional 8
Authors
Mark A. Ricca, A. Keith Miles, Robert G. Anthony
Modeling the effects of fire severity and spatial complexity on Small Mammals in Yosemite National Park, California
We evaluated the impact of fire severity and related spatial and vegetative parameters on small mammal populations in 2 yr- to 15 yr-old burns in Yosemite National Park, California, USA. We also developed habitat models that would predict small mammal responses to fires of differing severity. We hypothesized that fire severity would influence the abundances of small mammals through changes in vege
Authors
Susan L. Roberts, Jan W. Van Wagtendonk, A. Keith Miles, Douglas A. Kelt, James A. Lutz
Mercury concentrations and space use of pre-breeding American avocets and black-necked stilts in San Francisco Bay
We examined factors influencing mercury concentrations in pre-breeding American avocets (Recurvirostra americana) and black-necked stilts (Himantopus mexicanus), the two most abundant breeding shorebirds in San Francisco Bay, California. We tested the effects of species, site, sex, year, and date on total mercury concentrations in blood of pre-breeding adult birds and used radio telemetry to deter
Authors
Joshua T. Ackerman, Collin A. Eagles-Smith, John Y. Takekawa, Scott A. Demers, Terrence L. Adelsbach, J.D. Bluso, A. Keith Miles, Nils Warnock, Thomas H. Suchanek, Steven E. Schwarzbach
Polycyclic aromatic hydrocarbon exposure in Steller's eiders (Polysticta stelleri) and harlequin ducks (Histronicus histronicus) in the Eastern Aleutian Islands, Alaska, USA
Seaducks may be affected by harmful levels of polycyclic aromatic hydrocarbons (PAHs) at seaports near the Arctic. As an indicator of exposure to PAHs, we measured hepatic enzyme 7-ethoxyresorufin-O-deethylase activity (EROD) to determine cytochrome P4501A induction in Steller's eiders (Polysticta stelleri) and Harlequin ducks (Histronicus histronicus) from Unalaska, Popof, and Unga Islands (AK, U
Authors
A.K. Miles, Paul L. Flint, K.A. Trust, M.A. Ricca, S.E. Spring, D.E. Arrieta, T. Hollmen, B.W. Wilson
Spatial and temporal structure of macroinvertebrate assemblages, San Francisco Bay salt ponds
No abstract available.
Authors
A.K. Miles, S.E. Spring, M.A. Ricca, J.T. Takekawa, N.D. Athearn, D. H. Schoellhamer
Mercury in sediments, Alviso and Eden Landing salt ponds, south San Francisco Bay, California
No abstract available.
Authors
A.K. Miles, M.A. Ricca, S.E. Spring, C. Morris, C. Wilcox, T. Maurer
Environmental contaminants in bald eagle eggs from the Aleutian archipelago
We collected 136 fresh and unhatched eggs from bald eagle (Haliaeetus leucocephalus) nests and assessed productivity on eight islands in the Aleutian archipelago, 2000 to 2002. Egg contents were analyzed for a broad spectrum of organochlorine (OC) contaminants, mercury (Hg), and stable isotopes of carbon (??13C) and nitrogen (??15N). Concentrations of polychlorinated biphenyls (??PCBs), p,p???- di
Authors
R.G. Anthony, A.K. Miles, M.A. Ricca, J. A. Estes
Effect of lipid extraction on analyses of stable carbon and stable nitrogen isotopes in coastal organisms of the Aleutian archipelago
We tested whether extracting lipids reduced confounding variation in ??13C and ??15N values by analyzing paired lipid-extracted (LE) and non-lipid-extracted (NLE) samples of bald eagle (Haliaeetus leucocephalus (L., 1766)) whole eggs, muscle tissue from nine seabird and one terrestrial bird species, muscle tissue from four marine fish species, and blue mussels (Mytilus edulis L., 1758) collected f
Authors
M.A. Ricca, A.K. Miles, R.G. Anthony, X. Deng, S. S. O. Hung
Differential gene expression induced by exposure of captive mink to fuel oil: A model for the sea otter
Free-ranging sea otters are subject to hydrocarbon exposure from a variety of sources, both natural and anthropogenic. Effects of direct exposure to unrefined crude oil, such as that associated with the Exxon Valdez oil spill, are readily apparent. However, the impact of subtle but pathophysiologically relevant concentrations of crude oil on sea otters is difficult to assess. The present study was
Authors
Lizabeth Bowen, F. Riva, C. Mohr, B. Aldridge, J. Schwartz, A. Keith Miles, J.L. Stott
Diets of introduced predators using stable isotopes and stomach contents
In a study of predation on ground-nesting birds at South San Francisco Bay (South Bay), California, USA, we analyzed stomach contents and stable isotopes of carbon and nitrogen to identify commonly consumed prey. We obtained the stomach contents from 206 nonnative red foxes (Vulpes vulpes regalis) collected in the South Bay area and Monterey County during 1995-2001 and from 68 feral cats (Felis si
Authors
A.M. Meckstroth, A.K. Miles, S. Chandra
Trophic structure and avian communities across a salinity gradient in evaporation ponds of the San Francisco Bay estuary
Commercial salt evaporation ponds comprise a large proportion of baylands adjacent to the San Francisco Bay, a highly urbanized estuary. In the past two centuries, more than 79% of the historic tidal wetlands in this estuary have been lost. Resource management agencies have acquired more than 10 000 ha of commercial salt ponds with plans to undertake one of the largest wetland restoration projects
Authors
John Y. Takekawa, A.K. Miles, D. H. Schoellhamer, N.D. Athearn, M. K. Saiki, W.D. Duffy, S. Kleinschmidt, G.G. Shellenbarger, C.A. Jannusch
Expressed MHC class II genes in sea otters (Enhydra lutris) from geographically disparate populations
The major histocompatibility complex (MHC) is central to maintaining the immunologic vigor of individuals and populations. Classical MHC class II genes were targeted for partial sequencing in sea otters (Enhydra lutris) from populations in California, Washington, and Alaska. Sequences derived from sea otter peripheral blood leukocyte mRNAs were similar to those classified as DQA, DQB, DRA, and DRB
Authors
Lizabeth Bowen, B.M. Aldridge, A. Keith Miles, J.L. Stott
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government