Thomas Custer (Former Employee)
Science and Products
Filter Total Items: 166
Concentrations and spatial patterns of organic contaminants in tree swallow (Tachycineta bicolor) eggs at United States and binational Great Lakes Areas of Concern, 2010–2015 Concentrations and spatial patterns of organic contaminants in tree swallow (Tachycineta bicolor) eggs at United States and binational Great Lakes Areas of Concern, 2010–2015
Tree swallows, Tachycineta bicolor, were sampled across the Great Lakes basin in 2010 through 2015 to provide a system-wide assessment of current exposure to organic contaminants. The results provide information identified as critical by regulators to assess the “bird or animal deformity or reproductive problems” beneficial use impairment. Eggs were collected from 69 sites across all 5...
Authors
Christine M. Custer, Thomas W. Custer, Paul M. Dummer, Diana R. Goldberg, J. Christian Franson
Mercury concentrations in eggs of red-winged blackbirds and tree swallows breeding in Voyageurs National Park, Minnesota Mercury concentrations in eggs of red-winged blackbirds and tree swallows breeding in Voyageurs National Park, Minnesota
Most investigations of the environmental effects of mercury (Hg) have focused on aquatic food webs that include piscivorous fish or wildlife. However, recent investigations have shown that other species, including passerine songbirds, may also be at risk from exposure to methylmercury (MeHg). We quantified Hg concentrations in eggs of two species of songbirds, red-winged blackbirds...
Authors
Robin W. Tyser, Kristofer R. Rolfhus, James G. Wiener, Steve K. Windels, Thomas W. Custer, Paul M. Dummer
Chromosomal damage and EROD induction in tree swallows (Tachycineta bicolor) along the Upper Mississippi River, Minnesota, USA Chromosomal damage and EROD induction in tree swallows (Tachycineta bicolor) along the Upper Mississippi River, Minnesota, USA
The health of tree swallows, Tachycineta bicolor, on the Upper Mississippi River (UMR) was assessed in 2010 and 2011 using biomarkers at six sites downriver of Minneapolis/St. Paul, MN metropolitan area, a tributary into the UMR, and a nearby lake. Chromosomal damage was evaluated in nestling blood by measuring the coefficient of variation of DNA content (DNA CV) using flow cytometry...
Authors
Emilie Bigorgne, Thomas W. Custer, Paul M. Dummer, Richard A. Erickson, Natalie K. Karouna-Renier, Sandra L. Schultz, Christine M. Custer, Wayne E. Thogmartin, Cole W. Matson
Incubation stage and polychlorinated biphenyl (PCB) congener patterns in an altricial and precocial bird species Incubation stage and polychlorinated biphenyl (PCB) congener patterns in an altricial and precocial bird species
The composition of polychlorinated biphenyl (PCB) congeners was compared between non-incubated and embryonated eggs of tree swallows (Tachycineta bicolor) and little terns (Sterna albifrons) to determine if measurable changes in PCB congeners occurred during the embryonic period. There was no indication of changes in PCB congener patterns over the incubation period in tree swallows in...
Authors
Christine M. Custer, Thomas W. Custer, Stefan Thyen, Peter H. Becker
Contaminant exposure of birds nesting in Green Bay, Wisconsin, USA Contaminant exposure of birds nesting in Green Bay, Wisconsin, USA
In earlier studies, elevated concentrations of polychlorinated biphenyl (PCB) and p,p'-dichlorodiphenyldichloroethylene (DDE) were reported in double-crested cormorant (Phalacrocorax auritus) eggs and tree swallow (Tachycineta bicolor) eggs and nestlings collected from lower Green Bay (WI, USA) in 1994 and 1995 and black-crowned night-heron (Nycticorax nycticorax) eggs collected in 1991
Authors
Thomas W. Custer, Paul M. Dummer, Christine M. Custer, J. Christian Franson, Michael Jones
Changes in polychlorinated biphenyl (PCB) exposure in tree swallows (Tachycineta bicolor) nesting along the Sheboygan River, WI, USA Changes in polychlorinated biphenyl (PCB) exposure in tree swallows (Tachycineta bicolor) nesting along the Sheboygan River, WI, USA
Exposure to polychlorinated biphenyls (PCBs) in tree swallow ( Tachycineta bicolor) eggs on the Sheboygan River, Wisconsin in the 1990s was higher at sites downstream (geometric means = 3.33–8.69 μg/g wet wt.) of the putative PCB source in Sheboygan Falls, Wisconsin than it was above the source (1.24 μg/g) with the exposure declining as the distance downstream of the source increased. A...
Authors
Christine M. Custer, Thomas W. Custer, Sean M. Strom, Kathleen A. Patnode, J. Christian Franson
Science and Products
Filter Total Items: 166
Concentrations and spatial patterns of organic contaminants in tree swallow (Tachycineta bicolor) eggs at United States and binational Great Lakes Areas of Concern, 2010–2015 Concentrations and spatial patterns of organic contaminants in tree swallow (Tachycineta bicolor) eggs at United States and binational Great Lakes Areas of Concern, 2010–2015
Tree swallows, Tachycineta bicolor, were sampled across the Great Lakes basin in 2010 through 2015 to provide a system-wide assessment of current exposure to organic contaminants. The results provide information identified as critical by regulators to assess the “bird or animal deformity or reproductive problems” beneficial use impairment. Eggs were collected from 69 sites across all 5...
Authors
Christine M. Custer, Thomas W. Custer, Paul M. Dummer, Diana R. Goldberg, J. Christian Franson
Mercury concentrations in eggs of red-winged blackbirds and tree swallows breeding in Voyageurs National Park, Minnesota Mercury concentrations in eggs of red-winged blackbirds and tree swallows breeding in Voyageurs National Park, Minnesota
Most investigations of the environmental effects of mercury (Hg) have focused on aquatic food webs that include piscivorous fish or wildlife. However, recent investigations have shown that other species, including passerine songbirds, may also be at risk from exposure to methylmercury (MeHg). We quantified Hg concentrations in eggs of two species of songbirds, red-winged blackbirds...
Authors
Robin W. Tyser, Kristofer R. Rolfhus, James G. Wiener, Steve K. Windels, Thomas W. Custer, Paul M. Dummer
Chromosomal damage and EROD induction in tree swallows (Tachycineta bicolor) along the Upper Mississippi River, Minnesota, USA Chromosomal damage and EROD induction in tree swallows (Tachycineta bicolor) along the Upper Mississippi River, Minnesota, USA
The health of tree swallows, Tachycineta bicolor, on the Upper Mississippi River (UMR) was assessed in 2010 and 2011 using biomarkers at six sites downriver of Minneapolis/St. Paul, MN metropolitan area, a tributary into the UMR, and a nearby lake. Chromosomal damage was evaluated in nestling blood by measuring the coefficient of variation of DNA content (DNA CV) using flow cytometry...
Authors
Emilie Bigorgne, Thomas W. Custer, Paul M. Dummer, Richard A. Erickson, Natalie K. Karouna-Renier, Sandra L. Schultz, Christine M. Custer, Wayne E. Thogmartin, Cole W. Matson
Incubation stage and polychlorinated biphenyl (PCB) congener patterns in an altricial and precocial bird species Incubation stage and polychlorinated biphenyl (PCB) congener patterns in an altricial and precocial bird species
The composition of polychlorinated biphenyl (PCB) congeners was compared between non-incubated and embryonated eggs of tree swallows (Tachycineta bicolor) and little terns (Sterna albifrons) to determine if measurable changes in PCB congeners occurred during the embryonic period. There was no indication of changes in PCB congener patterns over the incubation period in tree swallows in...
Authors
Christine M. Custer, Thomas W. Custer, Stefan Thyen, Peter H. Becker
Contaminant exposure of birds nesting in Green Bay, Wisconsin, USA Contaminant exposure of birds nesting in Green Bay, Wisconsin, USA
In earlier studies, elevated concentrations of polychlorinated biphenyl (PCB) and p,p'-dichlorodiphenyldichloroethylene (DDE) were reported in double-crested cormorant (Phalacrocorax auritus) eggs and tree swallow (Tachycineta bicolor) eggs and nestlings collected from lower Green Bay (WI, USA) in 1994 and 1995 and black-crowned night-heron (Nycticorax nycticorax) eggs collected in 1991
Authors
Thomas W. Custer, Paul M. Dummer, Christine M. Custer, J. Christian Franson, Michael Jones
Changes in polychlorinated biphenyl (PCB) exposure in tree swallows (Tachycineta bicolor) nesting along the Sheboygan River, WI, USA Changes in polychlorinated biphenyl (PCB) exposure in tree swallows (Tachycineta bicolor) nesting along the Sheboygan River, WI, USA
Exposure to polychlorinated biphenyls (PCBs) in tree swallow ( Tachycineta bicolor) eggs on the Sheboygan River, Wisconsin in the 1990s was higher at sites downstream (geometric means = 3.33–8.69 μg/g wet wt.) of the putative PCB source in Sheboygan Falls, Wisconsin than it was above the source (1.24 μg/g) with the exposure declining as the distance downstream of the source increased. A...
Authors
Christine M. Custer, Thomas W. Custer, Sean M. Strom, Kathleen A. Patnode, J. Christian Franson