| 项目编号: | 1655665
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| 项目名称: | Collaborative Research: How do predators spread disease? Tests of five ecological and eco-evolutionary mechanisms with disease in the plankton |
| 作者: | Carla Caceres
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| 承担单位: | University of Illinois at Urbana-Champaign
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| 批准年: | 2017
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| 开始日期: | 2017-07-15
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| 结束日期: | 2020-06-30
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| 资助金额: | 400000
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | disease
; predator
; disease outbreak
; mechanism
; disease organism
; disease ecologist
; host
; project
; lake
; insect predator
; predatory insect
|
| 英文摘要: | A practical goal of disease ecologists is to find ways to stop or slow the spread of infection from host to host. A popular idea is that predators control disease outbreaks by killing infected prey which are weaker and thereby easier to capture. However, this proposal warns that predators may sometimes spread disease in host populations. The researchers will use organisms living in lakes to test five ways in which predators could spread disease. These ideas are that predators: (1) while eating prey, physically spread parasites into prey habitat; (2) can increase food supply for prey, and more food can cause higher parasite production within infected hosts; (3) can shift the composition of prey populations towards certain ages and sizes that get infected more easily; (4) can kill other species that control disease; and (5) can cause genetic changes to prey populations, making them more susceptible to disease organisms. The project will focus on water fleas (the hosts), a deadly fungal parasite, and an insect predator to test these possibilities. The research uses these organisms as a model system: outbreaks of this fungus can be sampled in lakes, created in experiments within lakes and in the lab, and can be understood using mathematical models. These new ideas, once tested thoroughly in the lab and verified in nature, will help managers make prudent decisions on how to control disease outbreaks in wild and domestic animal populations. The project will train many students, and focus on engaging those in underrepresented groups.
This project integrates three approaches. First, it will invest in a survey of fungal epidemics in water flea hosts in 40 lakes. The data from this large survey will be used to generate complex statistical models that test the first four mechanisms (ideas) given above. Second, it uses controlled experiments. One experiment will test mechanisms (2)-(4) with factorial manipulation of predatory insects and "competitor-diluters" (other water flea species which eat parasite propagules). A second experiment will investigate details of mechanisms (1)-(3). A third experiment investigates a tradeoff among clonal genotypes of the host; genotypes which better escape predation are more vulnerable to parasites. The hypothesis is that predators will shift host populations, via rapid evolution, towards bigger epidemics via this tradeoff. Third, this project develops a new suite of parameterized, mathematical (dynamical) models, designed to evaluate each of the mechanisms separately and together. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89715
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Carla Caceres. Collaborative Research: How do predators spread disease? Tests of five ecological and eco-evolutionary mechanisms with disease in the plankton. 2017-01-01.
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