6 results on '"Carter T. Atkinson"'
Search Results
2. Modeling future conservation of Hawaiian honeycreepers by mosquito management and translocation of disease-tolerant Amakihi.
- Author
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Peter H F Hobbelen, Michael D Samuel, Dennis A LaPointe, and Carter T Atkinson
- Subjects
Medicine ,Science - Abstract
Avian malaria is an important cause of the decline of endemic Hawaiian honeycreepers. Because of the complexity of this disease system we used a computer model of avian malaria in forest birds to evaluate how two proposed conservation strategies: 1) reduction of habitat for mosquito larvae and 2) establishment of a low-elevation, malaria-tolerant honeycreeper (Hawaii Amakihi) to mid-elevation forests would affect native Hawaiian honeycreeper populations. We evaluated these approaches in mid-elevation forests, where malaria transmission is seasonal and control strategies are more likely to work. Our model suggests the potential benefit of larval habitat reduction depends on the level of malaria transmission, abundance of larval cavities, and the ability to substantially reduce these cavities. Permanent reduction in larval habitat of >80% may be needed to control abundance of infectious mosquitoes and benefit bird populations. Establishment of malaria-tolerant Amakihi in mid-elevation forests increases Amakihi abundance, creates a larger disease reservoir, and increases the abundance of infectious mosquitoes which may negatively impact other honeycreepers. For mid-elevation sites where bird populations are severely affected by avian malaria, malaria-tolerant Amakihi had little impact on other honeycreepers. Both management strategies may benefit native Hawaiian honeycreepers, but benefits depend on specific forest characteristics, the amount of reduction in larval habitat that can be achieved, and how malaria transmission is affected by temperature.
- Published
- 2012
- Full Text
- View/download PDF
3. Mitigating Future Avian Malaria Threats to Hawaiian Forest Birds from Climate Change
- Author
-
Wei Liao, Michael D. Samuel, Dennis A. LaPointe, and Carter T. Atkinson
- Subjects
0106 biological sciences ,Male ,Mosquito Control ,Feral pig ,Epidemiology ,Swine ,Endangered species ,lcsh:Medicine ,Disease Vectors ,Forests ,01 natural sciences ,Mosquitoes ,Animal Diseases ,Animals, Genetically Modified ,0302 clinical medicine ,Medicine and Health Sciences ,lcsh:Science ,Avian Malaria ,Mammals ,education.field_of_study ,Multidisciplinary ,Ecology ,Agriculture ,Terrestrial Environments ,3. Good health ,Insects ,Mosquito control ,Infectious Diseases ,Vertebrates ,Research Article ,Livestock ,Malaria, Avian ,Arthropoda ,Infectious Disease Control ,Death Rates ,Climate Change ,030231 tropical medicine ,Population ,Biology ,010603 evolutionary biology ,Ecosystems ,Hawaii ,Birds ,03 medical and health sciences ,Avian malaria ,Climateprediction.net ,parasitic diseases ,medicine ,Parasitic Diseases ,Animals ,Computer Simulation ,education ,Demography ,Population Density ,lcsh:R ,Ecology and Environmental Sciences ,Organisms ,Biology and Life Sciences ,15. Life on land ,Models, Theoretical ,medicine.disease ,Tropical Diseases ,Invertebrates ,Insect Vectors ,Malaria ,Culicidae ,13. Climate action ,Threatened species ,Amniotes ,People and Places ,lcsh:Q ,Zoology - Abstract
Avian malaria, transmitted by Culex quinquefasciatus mosquitoes in the Hawaiian Islands, has been a primary contributor to population range limitations, declines, and extinctions for many endemic Hawaiian honeycreepers. Avian malaria is strongly influenced by climate; therefore, predicted future changes are expected to expand transmission into higher elevations and intensify and lengthen existing transmission periods at lower elevations, leading to further population declines and potential extinction of highly susceptible honeycreepers in mid- and high-elevation forests. Based on future climate changes and resulting malaria risk, we evaluated the viability of alternative conservation strategies to preserve endemic Hawaiian birds at mid and high elevations through the 21st century. We linked an epidemiological model with three alternative climatic projections from the Coupled Model Intercomparison Project to predict future malaria risk and bird population dynamics for the coming century. Based on climate change predictions, proposed strategies included mosquito population suppression using modified males, release of genetically modified refractory mosquitoes, competition from other introduced mosquitoes that are not competent vectors, evolved malaria-tolerance in native honeycreepers, feral pig control to reduce mosquito larval habitats, and predator control to improve bird demographics. Transmission rates of malaria are predicted to be higher than currently observed and are likely to have larger impacts in high-elevation forests where current low rates of transmission create a refuge for highly-susceptible birds. As a result, several current and proposed conservation strategies will be insufficient to maintain existing forest bird populations. We concluded that mitigating malaria transmission at high elevations should be a primary conservation goal. Conservation strategies that maintain highly susceptible species like Iiwi (Drepanis coccinea) will likely benefit other threatened and endangered Hawai’i species, especially in high-elevation forests. Our results showed that mosquito control strategies offer potential long-term benefits to high elevation Hawaiian honeycreepers. However, combined strategies will likely be needed to preserve endemic birds at mid elevations. Given the delay required to research, develop, evaluate, and improve several of these currently untested conservation strategies we suggest that planning should begin expeditiously.
- Published
- 2017
4. Modeling Future Conservation of Hawaiian Honeycreepers by Mosquito Management and Translocation of Disease-Tolerant Amakihi
- Author
-
Peter H. F. Hobbelen, Michael D. Samuel, Dennis A. LaPointe, and Carter T. Atkinson
- Subjects
0106 biological sciences ,Multidisciplinary ,Science ,010604 marine biology & hydrobiology ,lcsh:R ,lcsh:Medicine ,Correction ,010603 evolutionary biology ,01 natural sciences ,Medicine ,lcsh:Q ,lcsh:Science - Published
- 2013
5. Modeling Future Conservation of Hawaiian Honeycreepers by Mosquito Management and Translocation of Disease-Tolerant Amakihi
- Author
-
Carter T. Atkinson, Dennis A. LaPointe, Michael D. Samuel, and P.H.F. Hobbelen
- Subjects
0106 biological sciences ,Disease reservoir ,010504 meteorology & atmospheric sciences ,Epidemiology ,lcsh:Medicine ,Population Modeling ,Wildlife ,01 natural sciences ,Mosquitoes ,Abundance (ecology) ,Prevalence ,lcsh:Science ,Conservation Science ,Larva ,Multidisciplinary ,Ecology ,Geography ,Temperature ,Infectious Diseases ,Habitat ,Honeycreeper ,Medicine ,Research Article ,Malaria, Avian ,Animal Types ,Biology ,010603 evolutionary biology ,Microbiology ,Models, Biological ,Vector Biology ,Infectious Disease Epidemiology ,Hawaii ,Birds ,Avian malaria ,parasitic diseases ,medicine ,Animals ,Ecosystem ,Computer Simulation ,0105 earth and related environmental sciences ,Population Biology ,lcsh:R ,fungi ,Computational Biology ,15. Life on land ,Models, Theoretical ,biology.organism_classification ,medicine.disease ,Insect Vectors ,Culicidae ,lcsh:Q ,Veterinary Science ,Population Ecology ,Infectious Disease Modeling ,Malaria - Abstract
Avian malaria is an important cause of the decline of endemic Hawaiian honeycreepers. Because of the complexity of this disease system we used a computer model of avian malaria in forest birds to evaluate how two proposed conservation strategies: 1) reduction of habitat for mosquito larvae and 2) establishment of a low-elevation, malaria-tolerant honeycreeper (Hawaii Amakihi) to mid-elevation forests would affect native Hawaiian honeycreeper populations. We evaluated these approaches in mid-elevation forests, where malaria transmission is seasonal and control strategies are more likely to work. Our model suggests the potential benefit of larval habitat reduction depends on the level of malaria transmission, abundance of larval cavities, and the ability to substantially reduce these cavities. Permanent reduction in larval habitat of >80% may be needed to control abundance of infectious mosquitoes and benefit bird populations. Establishment of malaria-tolerant Amakihi in mid-elevation forests increases Amakihi abundance, creates a larger disease reservoir, and increases the abundance of infectious mosquitoes which may negatively impact other honeycreepers. For mid-elevation sites where bird populations are severely affected by avian malaria, malaria-tolerant Amakihi had little impact on other honeycreepers. Both management strategies may benefit native Hawaiian honeycreepers, but benefits depend on specific forest characteristics, the amount of reduction in larval habitat that can be achieved, and how malaria transmission is affected by temperature.
- Published
- 2012
6. Taqman real-time PCR detects Avipoxvirus DNA in blood of Hawai'i 'amakihi (Hemignathus virens).
- Author
-
Margaret E M Farias, Dennis A LaPointe, Carter T Atkinson, Christopher Czerwonka, Rajesh Shrestha, and Susan I Jarvi
- Subjects
Medicine ,Science - Abstract
Avipoxvirus sp. is a significant threat to endemic bird populations on several groups of islands worldwide, including Hawai'i, the Galapagos Islands, and the Canary Islands. Accurate identification and genotyping of Avipoxvirus is critical to the study of this disease and how it interacts with other pathogens, but currently available methods rely on invasive sampling of pox-like lesions and may be especially harmful in smaller birds.Here, we present a nested TaqMan Real-Time PCR for the detection of the Avipoxvirus 4b core protein gene in archived blood samples from Hawaiian birds. The method was successful in amplifying Avipoxvirus DNA from packed blood cells of one of seven Hawaiian honeycreepers with confirmed Avipoxvirus infections and 13 of 28 Hawai'i 'amakihi (Hemignathus virens) with suspected Avipoxvirus infections based on the presence of pox-like lesions. Mixed genotype infections have not previously been documented in Hawai'i but were observed in two individuals in this study.We anticipate that this method will be applicable to other closely related strains of Avipoxvirus and will become an important and useful tool in global studies of the epidemiology of Avipoxvirus.
- Published
- 2010
- Full Text
- View/download PDF
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