Christine Custer
Christine Custer
Science and Products
Filter Total Items: 92
Feeding habitat selection by Great Blue Herons and Great Egrets nesting in east central Minnesota
Great Blue Herons (Ardea herodias) and Great Egrets (Casmerodius albus) partitioned feeding habitat based on wetland size at Peltier Lake rookery in east central Minnesota. Great Blue Herons preferred large waterbodies (350 ha), whereas Great Egrets fed most often at small ponds (<25 ha). Forty-nine percent of Great Blue Herons used wetlands 301-400 hectares in size and 83% of Great Egrets fed in
Authors
Christine M. Custer, J. Galli
Do polychlorinated biphenyls contribute to reproduction effects in fish-eating birds?
No abstract available.
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, S. Gutreuter, K. L. Stromborg, P. David Allen, M. J. Melancon
Polycyclic aromatic hydrocarbons, aliphatic hydrocarbons, trace elements and monooxygenase activity in birds nesting on the North Platte River, Casper, Wyoming, USA
Tree swallow (Tachycineta bicolor) and house wren (Troglodytes aedon) eggs and chicks were collected near a refinery site on the North Platte River, Casper, Wyoming, USA and at a reference site 10 km upstream. Total polycylic aromatic hydrocarbon (PAH) concentrations in swallow and wren chicks were higher at the refinery site than at the reference site. Polycylic aromatic hydrocarbon concentrati
Authors
T. W. Custer, Christine M. Custer, K. Dickerson, K. Allen, M. J. Melancon, L.J. Schmidt
Organochlorine contaminants and biomarker response in double-crested cormorants nesting in Green Bay and Lake Michigan, Wisconsin, USA
Double-crested cormorant (Phalacrocorax auritus) eggs at pipping and sibling 10-day-old chicks were collected from two colonies in Green Bay, WI, one colony in Lake Michigan, WI, and reference colonies in South Dakota and Minnesota. Egg contents and chicks were analyzed for organochlorine contaminants including polychlorinated biphenyl (PCB) congeners. Livers of embryos and chicks were assayed for
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, K. L. Stromborg, P. David Allen, M. J. Melancon, D.S. Henshel
Organochlorine and trace element contamination in wintering and migrating diving ducks in the southern Great Lakes, USA, since the zebra mussel invasion
Because of the potential for increased trophic transfer of contaminants by zebra mussels (Dreissena sp.) to higher trophic levels, we collected four species of waterfowl (n = 65 ducks) from four locations in Lake Erie, Lake St. Clair, and Lake Michigan, USA, between 1991 and 1993 for organochlorine contaminant and trace element analyses. Geometric mean concentrations of total polychlorinated biphe
Authors
Christine M. Custer, T. W. Custer
Mixed-function oxygenases, oxidative stress, and chromosomal damage measured in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993-1994, male lesser scaup (Aythya alfinis) were collected on the heavily polluted Indiana Harbor Canal, East Chicago, Indiana, and examined for several bioindicators of chemical exposure. Livers were analyzed for activities of three cytochrome P450-associated monooxygenases and four measures of oxidative stress. Blood and spleen were analyzed by flow cytometry for chromosom
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, D. W. Sparks, M. J. Melancon, D. J. Hoffman, J. W. Bickham, J.K. Wickliffe
Declining scaup populations: issues, hypotheses, and research needs
The population estimate for greater (Aythya marila) and lesser (Aythya affinis) scaup (combined) has declined dramatically since the early 1980s to record lows in 1998. The 1998 estimate of 3.47 million scaup is far below the goal of 6.3 million set in the North American Waterfowl Management Plan (NAWMP), causing concern among biologists and hunters. We summarize issuesof concern, hypotheses for f
Authors
J. E. Austin, A. D. Afton, M.G. Anderson, R. G. Clark, Christine M. Custer, J.S. Lawrence, J.B. Pollard, J.K. Ringelman
Trace elements, organochlorines, polycyclic aromatic hydrocarbons, dioxins, and furans in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993a??94, male lesser scaup (Aythya affinis) were collected on the heavily polluted Indiana Harbor Canal (IHC), East Chicago, IN, USA, and examined for tissue contaminant levels. Lesser scaup collected on the IHC had higher concentrations of cadmium (Cd), mercury (Hg), selenium (Se), polychlorinated biphenyls (PCBs), selected organchlorine pesticides, polychlorinated dibenzod
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, D. W. Sparks
Mixed-function oxygenases, oxidative stress, and chromosomal damage measured in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993-1994, male lesser scaup (Aythya affinis) were collected on the heavily polluted Indiana Harbor Canal, East Chicago, Indiana, and examined for several bioindicators of chemical exposure. Livers were analyzed for activities of three cytochrome P450-associated monooxygenases and four measures of oxidative stress. Blood and spleen were analyzed by flow cytometry for chromosom
Authors
T. W. Custer, Christine M. Custer, R.K. Hines, D.W. Sparks, M. J. Melancon, D. J. Hoffman, J. W. Bickham, J.K. Wickliffe
Organochlorine chemicals in tree swallows nesting in Pool 15 of the Upper Mississippi River
No abstract available.
Authors
Christine M. Custer, T. W. Custer, Mike Coffey
Declines of greater and lesser scaup populations: issues, hypotheses, and research needs
The population estimate for greater (Aythya marila) and lesser (Aythya affinis) scaup (combined) has declined dramatically since the early 1980s to record lows in 1998. The 1998 estimate of 3.47 million scaup is far below the goal of 6.3 million set in the North American Waterfowl Management Plan (NAWMP), causing concern among biologists and hunters. We summarize issues of concern, hypotheses for
Authors
J. E. Austin, A. D. Afton, M.G. Anderson, R. G. Clark, Christine M. Custer, J. Lawrence, J.B. Pollard, J.K. Ringelman
Organochlorine contaminants and Tree Swallows along the Fox River and Green Bay, Wisconsin, USA
Green Bay, Wisconsin is contaminated with polychlorinated biphenyls (PCBs) however, whether these contaminants affect reproduction in insectivorous birds is unknown. Tree Swallows, Tachycineta bicolor, are secondary cavity nesters that will nest in boxes and tolerate handling. Because Tree Swallows are aquatic insectivores, residues in their tissues are primarily indicative of contaminants in se
Authors
Christine M. Custer, T. W. Custer, P. David Allen, K. L. Stromborg, M. J. Melancon
Science and Products
Filter Total Items: 92
Feeding habitat selection by Great Blue Herons and Great Egrets nesting in east central Minnesota
Great Blue Herons (Ardea herodias) and Great Egrets (Casmerodius albus) partitioned feeding habitat based on wetland size at Peltier Lake rookery in east central Minnesota. Great Blue Herons preferred large waterbodies (350 ha), whereas Great Egrets fed most often at small ponds (<25 ha). Forty-nine percent of Great Blue Herons used wetlands 301-400 hectares in size and 83% of Great Egrets fed in
Authors
Christine M. Custer, J. Galli
Do polychlorinated biphenyls contribute to reproduction effects in fish-eating birds?
No abstract available.
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, S. Gutreuter, K. L. Stromborg, P. David Allen, M. J. Melancon
Polycyclic aromatic hydrocarbons, aliphatic hydrocarbons, trace elements and monooxygenase activity in birds nesting on the North Platte River, Casper, Wyoming, USA
Tree swallow (Tachycineta bicolor) and house wren (Troglodytes aedon) eggs and chicks were collected near a refinery site on the North Platte River, Casper, Wyoming, USA and at a reference site 10 km upstream. Total polycylic aromatic hydrocarbon (PAH) concentrations in swallow and wren chicks were higher at the refinery site than at the reference site. Polycylic aromatic hydrocarbon concentrati
Authors
T. W. Custer, Christine M. Custer, K. Dickerson, K. Allen, M. J. Melancon, L.J. Schmidt
Organochlorine contaminants and biomarker response in double-crested cormorants nesting in Green Bay and Lake Michigan, Wisconsin, USA
Double-crested cormorant (Phalacrocorax auritus) eggs at pipping and sibling 10-day-old chicks were collected from two colonies in Green Bay, WI, one colony in Lake Michigan, WI, and reference colonies in South Dakota and Minnesota. Egg contents and chicks were analyzed for organochlorine contaminants including polychlorinated biphenyl (PCB) congeners. Livers of embryos and chicks were assayed for
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, K. L. Stromborg, P. David Allen, M. J. Melancon, D.S. Henshel
Organochlorine and trace element contamination in wintering and migrating diving ducks in the southern Great Lakes, USA, since the zebra mussel invasion
Because of the potential for increased trophic transfer of contaminants by zebra mussels (Dreissena sp.) to higher trophic levels, we collected four species of waterfowl (n = 65 ducks) from four locations in Lake Erie, Lake St. Clair, and Lake Michigan, USA, between 1991 and 1993 for organochlorine contaminant and trace element analyses. Geometric mean concentrations of total polychlorinated biphe
Authors
Christine M. Custer, T. W. Custer
Mixed-function oxygenases, oxidative stress, and chromosomal damage measured in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993-1994, male lesser scaup (Aythya alfinis) were collected on the heavily polluted Indiana Harbor Canal, East Chicago, Indiana, and examined for several bioindicators of chemical exposure. Livers were analyzed for activities of three cytochrome P450-associated monooxygenases and four measures of oxidative stress. Blood and spleen were analyzed by flow cytometry for chromosom
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, D. W. Sparks, M. J. Melancon, D. J. Hoffman, J. W. Bickham, J.K. Wickliffe
Declining scaup populations: issues, hypotheses, and research needs
The population estimate for greater (Aythya marila) and lesser (Aythya affinis) scaup (combined) has declined dramatically since the early 1980s to record lows in 1998. The 1998 estimate of 3.47 million scaup is far below the goal of 6.3 million set in the North American Waterfowl Management Plan (NAWMP), causing concern among biologists and hunters. We summarize issuesof concern, hypotheses for f
Authors
J. E. Austin, A. D. Afton, M.G. Anderson, R. G. Clark, Christine M. Custer, J.S. Lawrence, J.B. Pollard, J.K. Ringelman
Trace elements, organochlorines, polycyclic aromatic hydrocarbons, dioxins, and furans in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993a??94, male lesser scaup (Aythya affinis) were collected on the heavily polluted Indiana Harbor Canal (IHC), East Chicago, IN, USA, and examined for tissue contaminant levels. Lesser scaup collected on the IHC had higher concentrations of cadmium (Cd), mercury (Hg), selenium (Se), polychlorinated biphenyls (PCBs), selected organchlorine pesticides, polychlorinated dibenzod
Authors
T. W. Custer, Christine M. Custer, R. K. Hines, D. W. Sparks
Mixed-function oxygenases, oxidative stress, and chromosomal damage measured in lesser scaup wintering on the Indiana Harbor Canal
During the winter of 1993-1994, male lesser scaup (Aythya affinis) were collected on the heavily polluted Indiana Harbor Canal, East Chicago, Indiana, and examined for several bioindicators of chemical exposure. Livers were analyzed for activities of three cytochrome P450-associated monooxygenases and four measures of oxidative stress. Blood and spleen were analyzed by flow cytometry for chromosom
Authors
T. W. Custer, Christine M. Custer, R.K. Hines, D.W. Sparks, M. J. Melancon, D. J. Hoffman, J. W. Bickham, J.K. Wickliffe
Organochlorine chemicals in tree swallows nesting in Pool 15 of the Upper Mississippi River
No abstract available.
Authors
Christine M. Custer, T. W. Custer, Mike Coffey
Declines of greater and lesser scaup populations: issues, hypotheses, and research needs
The population estimate for greater (Aythya marila) and lesser (Aythya affinis) scaup (combined) has declined dramatically since the early 1980s to record lows in 1998. The 1998 estimate of 3.47 million scaup is far below the goal of 6.3 million set in the North American Waterfowl Management Plan (NAWMP), causing concern among biologists and hunters. We summarize issues of concern, hypotheses for
Authors
J. E. Austin, A. D. Afton, M.G. Anderson, R. G. Clark, Christine M. Custer, J. Lawrence, J.B. Pollard, J.K. Ringelman
Organochlorine contaminants and Tree Swallows along the Fox River and Green Bay, Wisconsin, USA
Green Bay, Wisconsin is contaminated with polychlorinated biphenyls (PCBs) however, whether these contaminants affect reproduction in insectivorous birds is unknown. Tree Swallows, Tachycineta bicolor, are secondary cavity nesters that will nest in boxes and tolerate handling. Because Tree Swallows are aquatic insectivores, residues in their tissues are primarily indicative of contaminants in se
Authors
Christine M. Custer, T. W. Custer, P. David Allen, K. L. Stromborg, M. J. Melancon