Carter T Atkinson (Former Employee)
Science and Products
Filter Total Items: 94
Ecology and diagnosis of introduced avian malaria in Hawaiian forest birds
Avian malaria is a disease caused by species of protozoan parasites (Plasmodium) that infect birds. Related species commonly infect reptiles, birds and mammals in tropical and temperate regions of the world. Transmitted by mosquitoes, the parasites spend part of their lives in the red blood cells of birds (Figure 1). Avian malaria is common in continental areas, but is absent from the most isolate
Authors
Carter T. Atkinson
Comparative susceptibility of introduced forest-dwelling mosquitoes in Hawai'i to avian malaria, Plasmodium relictum
To identify potential vectors of avian malaria in Hawaiian native forests, the innate susceptibility of Aedes albopictus, Wyeomyia mitchellii, and Culex quinquefasciatus from 3 geographical sites along an altitudinal gradient was evaluated using local isolates of Plasmodium relictum. Mosquitoes were dissected 5-8 and 9-13 days postinfective blood meal and microscopically examined for oocysts and s
Authors
D.A. Lapointe, M.L. Goff, C. T. Atkinson
Host population persistence in the face of introduced vector-borne diseases: Hawaii amakihi and avian malaria
The past quarter century has seen an unprecedented increase in the number of new and emerging infectious diseases throughout the world, with serious implications for human and wildlife populations. We examined host persistence in the face of introduced vector-borne diseases in Hawaii, where introduced avian malaria and introduced vectors have had a negative impact on most populations of Hawaiian f
Authors
B.L. Woodworth, C. T. Atkinson, D.A. Lapointe, P.J. Hart, C.S. Spiegel, E.J. Tweed, C. Henneman, J. LeBrun, T. Denette, R. DeMots, K.L. Kozar, D. Triglia, Dan Lease, A. Gregor, T. Smith, D. Duffy
Biocomplexity of introduced avian diseases in Hawai`i: threats to biodiversity of native forest ecosystems
No abstract available.
Authors
Bethany L. Woodworth, Carter T. Atkinson, Michael D. Samuel, Dennis A. LaPointe, Paul C. Banko, Jorge A. Ahumada
Prevalence of pox-like lesions and malaria in forest bird communitites on leeward Mauna Loa volcano, Hawaii
Introduced avian pox virus and malaria have had devastating impacts on native Hawaiian forest birds, yet little has been published about their prevalence and distribution in forest bird communities outside of windward Hawaii Island. We surveyed native and non-native forest birds for these two diseases at three different elevations on leeward Mauna Loa Volcano at the Kona Forest Unit of Hakalau For
Authors
Carter T. Atkinson, Julie K. Lease, Robert J. Dusek, Michael D. Samuel
Natural selection of the major histocompatibility complex (Mhc) in Hawaiian honeycreepers (Drepanidinae)
The native Hawaiian honeycreepers represent a classic example of adaptive radiation and speciation, but currently face one the highest extinction rates in the world. Although multiple factors have likely influenced the fate of Hawaiian birds, the relatively recent introduction of avian malaria is thought to be a major factor limiting honeycreeper distribution and abundance. We have initiated genet
Authors
S.I. Jarvi, C.L. Tarr, C.E. Mcintosh, C. T. Atkinson, R.C. Fleischer
Prevalence and differential host-specificity of two avian blood parasite genera in the Australo-Papuan region
The degree to which widespread avian blood parasites in the genera Plasmodium and Haemoproteus pose a threat to novel hosts depends in part on the degree to which they are constrained to a particular host or host family. We examined the host distribution and host-specificity of these parasites in birds from two relatively understudied and isolated locations: Australia and Papua New Guinea. Using p
Authors
J.S. Beadell, E. Gering, J. Austin, J.P. Dumbacher, M.A. Peirce, T.K. Pratt, C. T. Atkinson, R.C. Fleischer
A rapid method for counting nucleated erythrocytes on stained blood smears by digital image analysis
Measures of parasitemia by intraerythrocytic hematozoan parasites are normally expressed as the number of infected erythrocytes per n erythrocytes and are notoriously tedious and time consuming to measure. We describe a protocol for generating rapid counts of nucleated erythrocytes from digital micrographs of thin blood smears that can be used to estimate intensity of hematozoan infections in nonm
Authors
E. Gering, C. T. Atkinson
Detection of avian malaria (Plasmodium spp.) in native land birds of American Samoa
This study documents the presence of Plasmodium spp. in landbirds of central Polynesia. Blood samples collected from eight native and introduced species from the island of Tutuila, American Samoa were evaluated for the presence of Plasmodium spp. by nested rDNA PCR, serology and/or microscopy. A total of 111/188 birds (59%) screened by nested PCR were positive. Detection of Plasmodium spp. was ver
Authors
S.I. Jarvi, M.E.M. Farias, H. Baker, H.B. Freifeld, P.E. Baker, E. Van Gelder, J.G. Massey, C. T. Atkinson
PCR diagnostics underestimate the prevalence of avian malaria (Plasmodium relictum) in experimentally-infected passerines
Several polymerase chain reaction (PCR)-based methods have recently been developed for diagnosing malarial infections in both birds and reptiles, but a critical evaluation of their sensitivity in experimentally-infected hosts has not been done. This study compares the sensitivity of several PCR-based methods for diagnosing avian malaria (Plasmodium relictum) in captive Hawaiian honeycreepers using
Authors
Susan I. Jarvi, Jeffrey J. Schultz, Carter T. Atkinson
Immunogenetics and resistance to avian malaria in Hawaiian honeycreepers (Drepanidinae)
Although a number of factors have contributed to the decline and extinction of Hawai‘i’s endemic terrestrial avifauna, introduced avian malaria (Plasmodium relicturn) is probably the single most important factor preventing recovery of these birds in low-elevation habitats. Continued decline in numbers, fragmentation of populations, and extinction of species that are still relatively common will li
Authors
Susan I. Jarvi, Carter T. Atkinson, Robert C. Fleischer
Serological responses and immunity to superinfection with avian malaria in experimentally-infected Hawaii Amakihi
Six of seven Hawaii Amakihi (Hemignathus virens) with chronic malarial infections had no increases in peripheral parasitemia, declines in food consumption, or loss of body weight when rechallenged with the homologous isolate of Plasmodium relictum 61 to 62 days after initial infection. Five uninfected control amakihi exposed at the same time to infective mosquito bites developed acute infections w
Authors
Carter T. Atkinson, Robert J. Dusek, Julie K. Lease
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Filter Total Items: 94
Ecology and diagnosis of introduced avian malaria in Hawaiian forest birds
Avian malaria is a disease caused by species of protozoan parasites (Plasmodium) that infect birds. Related species commonly infect reptiles, birds and mammals in tropical and temperate regions of the world. Transmitted by mosquitoes, the parasites spend part of their lives in the red blood cells of birds (Figure 1). Avian malaria is common in continental areas, but is absent from the most isolateAuthorsCarter T. AtkinsonComparative susceptibility of introduced forest-dwelling mosquitoes in Hawai'i to avian malaria, Plasmodium relictum
To identify potential vectors of avian malaria in Hawaiian native forests, the innate susceptibility of Aedes albopictus, Wyeomyia mitchellii, and Culex quinquefasciatus from 3 geographical sites along an altitudinal gradient was evaluated using local isolates of Plasmodium relictum. Mosquitoes were dissected 5-8 and 9-13 days postinfective blood meal and microscopically examined for oocysts and sAuthorsD.A. Lapointe, M.L. Goff, C. T. AtkinsonHost population persistence in the face of introduced vector-borne diseases: Hawaii amakihi and avian malaria
The past quarter century has seen an unprecedented increase in the number of new and emerging infectious diseases throughout the world, with serious implications for human and wildlife populations. We examined host persistence in the face of introduced vector-borne diseases in Hawaii, where introduced avian malaria and introduced vectors have had a negative impact on most populations of Hawaiian fAuthorsB.L. Woodworth, C. T. Atkinson, D.A. Lapointe, P.J. Hart, C.S. Spiegel, E.J. Tweed, C. Henneman, J. LeBrun, T. Denette, R. DeMots, K.L. Kozar, D. Triglia, Dan Lease, A. Gregor, T. Smith, D. DuffyBiocomplexity of introduced avian diseases in Hawai`i: threats to biodiversity of native forest ecosystems
No abstract available.AuthorsBethany L. Woodworth, Carter T. Atkinson, Michael D. Samuel, Dennis A. LaPointe, Paul C. Banko, Jorge A. AhumadaPrevalence of pox-like lesions and malaria in forest bird communitites on leeward Mauna Loa volcano, Hawaii
Introduced avian pox virus and malaria have had devastating impacts on native Hawaiian forest birds, yet little has been published about their prevalence and distribution in forest bird communities outside of windward Hawaii Island. We surveyed native and non-native forest birds for these two diseases at three different elevations on leeward Mauna Loa Volcano at the Kona Forest Unit of Hakalau ForAuthorsCarter T. Atkinson, Julie K. Lease, Robert J. Dusek, Michael D. SamuelNatural selection of the major histocompatibility complex (Mhc) in Hawaiian honeycreepers (Drepanidinae)
The native Hawaiian honeycreepers represent a classic example of adaptive radiation and speciation, but currently face one the highest extinction rates in the world. Although multiple factors have likely influenced the fate of Hawaiian birds, the relatively recent introduction of avian malaria is thought to be a major factor limiting honeycreeper distribution and abundance. We have initiated genetAuthorsS.I. Jarvi, C.L. Tarr, C.E. Mcintosh, C. T. Atkinson, R.C. FleischerPrevalence and differential host-specificity of two avian blood parasite genera in the Australo-Papuan region
The degree to which widespread avian blood parasites in the genera Plasmodium and Haemoproteus pose a threat to novel hosts depends in part on the degree to which they are constrained to a particular host or host family. We examined the host distribution and host-specificity of these parasites in birds from two relatively understudied and isolated locations: Australia and Papua New Guinea. Using pAuthorsJ.S. Beadell, E. Gering, J. Austin, J.P. Dumbacher, M.A. Peirce, T.K. Pratt, C. T. Atkinson, R.C. FleischerA rapid method for counting nucleated erythrocytes on stained blood smears by digital image analysis
Measures of parasitemia by intraerythrocytic hematozoan parasites are normally expressed as the number of infected erythrocytes per n erythrocytes and are notoriously tedious and time consuming to measure. We describe a protocol for generating rapid counts of nucleated erythrocytes from digital micrographs of thin blood smears that can be used to estimate intensity of hematozoan infections in nonmAuthorsE. Gering, C. T. AtkinsonDetection of avian malaria (Plasmodium spp.) in native land birds of American Samoa
This study documents the presence of Plasmodium spp. in landbirds of central Polynesia. Blood samples collected from eight native and introduced species from the island of Tutuila, American Samoa were evaluated for the presence of Plasmodium spp. by nested rDNA PCR, serology and/or microscopy. A total of 111/188 birds (59%) screened by nested PCR were positive. Detection of Plasmodium spp. was verAuthorsS.I. Jarvi, M.E.M. Farias, H. Baker, H.B. Freifeld, P.E. Baker, E. Van Gelder, J.G. Massey, C. T. AtkinsonPCR diagnostics underestimate the prevalence of avian malaria (Plasmodium relictum) in experimentally-infected passerines
Several polymerase chain reaction (PCR)-based methods have recently been developed for diagnosing malarial infections in both birds and reptiles, but a critical evaluation of their sensitivity in experimentally-infected hosts has not been done. This study compares the sensitivity of several PCR-based methods for diagnosing avian malaria (Plasmodium relictum) in captive Hawaiian honeycreepers usingAuthorsSusan I. Jarvi, Jeffrey J. Schultz, Carter T. AtkinsonImmunogenetics and resistance to avian malaria in Hawaiian honeycreepers (Drepanidinae)
Although a number of factors have contributed to the decline and extinction of Hawai‘i’s endemic terrestrial avifauna, introduced avian malaria (Plasmodium relicturn) is probably the single most important factor preventing recovery of these birds in low-elevation habitats. Continued decline in numbers, fragmentation of populations, and extinction of species that are still relatively common will liAuthorsSusan I. Jarvi, Carter T. Atkinson, Robert C. FleischerSerological responses and immunity to superinfection with avian malaria in experimentally-infected Hawaii Amakihi
Six of seven Hawaii Amakihi (Hemignathus virens) with chronic malarial infections had no increases in peripheral parasitemia, declines in food consumption, or loss of body weight when rechallenged with the homologous isolate of Plasmodium relictum 61 to 62 days after initial infection. Five uninfected control amakihi exposed at the same time to infective mosquito bites developed acute infections wAuthorsCarter T. Atkinson, Robert J. Dusek, Julie K. Lease - News