| 项目编号: | 1601061
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| 项目名称: | DISSERTATION RESEARCH: Hypoxia-induced trade-offs on zooplankton vertical distribution and community structure in freshwaters |
| 作者: | Cayelan Carey
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| 承担单位: | Virginia Polytechnic Institute and State University
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| 批准年: | 2016
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| 开始日期: | 2016-06-01
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| 结束日期: | 2018-05-31
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| 资助金额: | 20880
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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: | zooplankton
; do concentration
; reservoir
; change
; freshwater ecosystem
; research
; zooplankton population
; bottom water
; water quality
; freshwater science laboratory
; zooplankton behavior
; diel vertical distribution
; abundance
; vertical distribution
; do
; zooplankton functional trait
; many zooplankton
; research approach
; undergraduate researcher
; food web
; research project
; species composition
; zooplankton community
|
| 英文摘要: | The overarching goal of this research project is to determine how altered dissolved oxygen (DO) concentrations in the bottom waters of lakes and reservoirs affect zooplankton behavior, abundances, and species composition, and how these changes may have consequences for water quality and food webs. Zooplankton play a critical role in freshwater ecosystems; they feed on phytoplankton, the base of the food web, and are in turn consumed by fish. Consequently, changes in zooplankton populations have the potential to drastically alter water quality and food webs. Zooplankton in freshwater ecosystems around the world exhibit diel vertical migration, in which they migrate to the bottom waters of a lake or reservoir during the day to escape visual predation by fish and damaging ultraviolet (UV) radiation. At night, many zooplankton migrate to the water's surface to feed on phytoplankton when the risk of predation and UV exposure is lower. However, human activities are resulting in decreased DO concentrations in the bottom waters of waterbodies globally. As a result of decreased DO, zooplankton may remain in the surface waters during the day and no longer vertically migrate, resulting in decreased abundance and changes in the species composition. This research will be conducted in partnership with a local water utility, and all data and results will be shared with managers to inform their water quality decisions. The project will involve training of at least two undergraduate researchers in freshwater science laboratory and field methods in an interdisciplinary setting. In addition, results from this research will provide the basis for creating interactive and hands-on educational activities for school children at a nature center.
This project will integrate a unique whole-ecosystem manipulation of bottom water (hypolimnetic) DO concentrations, a cross-ecosystem survey of reservoirs on a hypolimnetic DO gradient, high-frequency sonar to observe the diel vertical distribution of zooplankton, and experimental analyses of zooplankton functional traits to examine how changes in DO concentrations alter zooplankton species composition, abundance, and behavior. Biweekly summer field surveys will be conducted across five reservoirs that exhibit a range of hypolimnetic DO concentrations. One of the reservoirs has a hypolimnetic oxygenation system that will be experimentally turned on and off (thereby controlling DO concentrations at the whole-ecosystem scale) to directly assess the effects of DO on zooplankton populations. Multiple diel sampling campaigns will also be conducted that use sonar acoustic technology to observe the vertical distribution of zooplankton in the water column. Taken together, these integrated research approaches will mechanistically determine the effects of changing DO concentrations on zooplankton communities and resulting implications for water quality in lakes and reservoirs. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92199
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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: | |
Cayelan Carey. DISSERTATION RESEARCH: Hypoxia-induced trade-offs on zooplankton vertical distribution and community structure in freshwaters. 2016-01-01.
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