Caldwell Hahn, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 33
Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds
Immunologists and evolutionary biologists are interested in how the immune system evolves to fit an ecological niche. We studied the relationship between exposure to parasites and strength of immunity by investigating the response of two species of New World cowbirds (genus Molothrus, Icteridae), obligate brood parasites with contrasting life history strategies, to experimental arboviral...
Authors
Caldwell Hahn, William K. Reisen
Innate immunity is not related to the sex of adult Tree Swallows during the nestling period Innate immunity is not related to the sex of adult Tree Swallows during the nestling period
Evolutionary theory predicts that exposure to more diverse pathogens will result in the evolution of a more robust immune response. We predicted that during the breeding season the innate immune function of female Tree Swallows (Tachycineta bicolor) should be more effective than that of males because (1) the transmission of sexually transmitted microbes during copulation puts females at...
Authors
Bradley J. Houdek, Michael P. Lombardo, Patrick A. Thorpe, D. Caldwell Hahn
Innate immune response development in nestling tree swallows Innate immune response development in nestling tree swallows
We tracked the development of innate immunity in nestling Tree Swallows (Tachycineta bicolor) and compared it to that of adults using blood drawn from nestlings during days 6, 12, and 18 of the ∼20-day nestling period and from adults. Innate immunity was characterized using an in vitro assay of the ability of whole blood to kill Escherichia coli. The ability of whole blood to kill E...
Authors
T. Stambaugh, B.J. Houdek, M.P. Lombardo, P.A. Thorpe, Caldwell Hahn
Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio) Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio)
We studied androgen production during development in nestling Eastern Screech-Owls (Megascops asio) and hypothesized that gender and hatch order might influence serum levels of testosterone and androstenedione. Testosterone levels were highest immediately after hatching and declined significantly in the 4 weeks leading to fledging. The average level of testosterone for 1-7 day-old owls...
Authors
Corinne P. Kozlowski, D. Caldwell Hahn
A simplified method for extracting androgens from avian egg yolks A simplified method for extracting androgens from avian egg yolks
Female birds deposit significant amounts of steroid hormones into the yolks of their eggs. Studies have demonstrated that these hormones, particularly androgens, affect nestling growth and development. In order to measure androgen concentrations in avian egg yolks, most authors follow the extraction methods outlined by Schwabl (1993. Proc. Nat. Acad. Sci. USA 90:11446-11450). We describe...
Authors
C.P. Kozlowski, J.E. Bauman, D.C. Hahn
Comparison of immune responses of brown-headed cowbird and related blackbirds to West Nile and other mosquito-borne encephalitis viruses Comparison of immune responses of brown-headed cowbird and related blackbirds to West Nile and other mosquito-borne encephalitis viruses
The rapid geographic spread of West Nile virus (family Flaviviridae, genus Flavivirus, WNV) across the United States has stimulated interest in comparative host infection studies to delineate competent avian hosts critical for viral amplification. We compared the host competence of four taxonomically related blackbird species (Icteridae) after experimental infection with WNV and with two...
Authors
W.K. Reisen, D.C. Hahn
Science and Products
Filter Total Items: 33
Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds
Immunologists and evolutionary biologists are interested in how the immune system evolves to fit an ecological niche. We studied the relationship between exposure to parasites and strength of immunity by investigating the response of two species of New World cowbirds (genus Molothrus, Icteridae), obligate brood parasites with contrasting life history strategies, to experimental arboviral...
Authors
Caldwell Hahn, William K. Reisen
Innate immunity is not related to the sex of adult Tree Swallows during the nestling period Innate immunity is not related to the sex of adult Tree Swallows during the nestling period
Evolutionary theory predicts that exposure to more diverse pathogens will result in the evolution of a more robust immune response. We predicted that during the breeding season the innate immune function of female Tree Swallows (Tachycineta bicolor) should be more effective than that of males because (1) the transmission of sexually transmitted microbes during copulation puts females at...
Authors
Bradley J. Houdek, Michael P. Lombardo, Patrick A. Thorpe, D. Caldwell Hahn
Innate immune response development in nestling tree swallows Innate immune response development in nestling tree swallows
We tracked the development of innate immunity in nestling Tree Swallows (Tachycineta bicolor) and compared it to that of adults using blood drawn from nestlings during days 6, 12, and 18 of the ∼20-day nestling period and from adults. Innate immunity was characterized using an in vitro assay of the ability of whole blood to kill Escherichia coli. The ability of whole blood to kill E...
Authors
T. Stambaugh, B.J. Houdek, M.P. Lombardo, P.A. Thorpe, Caldwell Hahn
Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio) Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio)
We studied androgen production during development in nestling Eastern Screech-Owls (Megascops asio) and hypothesized that gender and hatch order might influence serum levels of testosterone and androstenedione. Testosterone levels were highest immediately after hatching and declined significantly in the 4 weeks leading to fledging. The average level of testosterone for 1-7 day-old owls...
Authors
Corinne P. Kozlowski, D. Caldwell Hahn
A simplified method for extracting androgens from avian egg yolks A simplified method for extracting androgens from avian egg yolks
Female birds deposit significant amounts of steroid hormones into the yolks of their eggs. Studies have demonstrated that these hormones, particularly androgens, affect nestling growth and development. In order to measure androgen concentrations in avian egg yolks, most authors follow the extraction methods outlined by Schwabl (1993. Proc. Nat. Acad. Sci. USA 90:11446-11450). We describe...
Authors
C.P. Kozlowski, J.E. Bauman, D.C. Hahn
Comparison of immune responses of brown-headed cowbird and related blackbirds to West Nile and other mosquito-borne encephalitis viruses Comparison of immune responses of brown-headed cowbird and related blackbirds to West Nile and other mosquito-borne encephalitis viruses
The rapid geographic spread of West Nile virus (family Flaviviridae, genus Flavivirus, WNV) across the United States has stimulated interest in comparative host infection studies to delineate competent avian hosts critical for viral amplification. We compared the host competence of four taxonomically related blackbird species (Icteridae) after experimental infection with WNV and with two...
Authors
W.K. Reisen, D.C. Hahn