Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR022956 |
Ecosystem Responses to Water Resource Developments in a Large Dryland River | |
Thoms, Martin1; Delong, Michael2 | |
2018-09-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:9页码:6643-6655 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA |
英文摘要 | Large floodplain rivers in dryland regions are becoming increasingly modified through water resource developments. Identifying ecosystem responses in these systems is challenging because of their natural variability, limited data, and the myriad of ways they are modified. This study used organic samples from snail, mussel, and fish specimens obtained from museum collections for the determination of carbon and nitrogen stable isotope ratios, for the Barwon-Darling River, Australia, between 1869 and 2005, a period of extensive water development. Three hypotheses were posed for this study: (1) The trophic status and food web character of the Barwon-Darling River will change in response to water resource developments; (2) responses in the trophic status and food web character will differ between different hydrogeomorphic zones identified along the river; and (3) food chain lengths will increase in response to water resource developments. Substantive changes in trophic status and components of the food web were detected between before and after water developments. Three lines of evidence support the conclusion of anthropogenically driven changes in the food web of this dryland floodplain-river system. Stable isotope ratios of fish, mussels, and snails differed between both hydrogeomorphic zones of the river and the before and after disturbance periods. Layman metrics, representing community niche space, differed between before and after disturbance periods. Also, both mean trophic position and food chain length differed between predisturbance and postdisturbance for the two functional process zones. The substantial shift in basal source contribution over time is a potential indicator of a state change and loss of resilience in this system. Plain Language Summary Resilience is the ability to absorb shocks and retain a normal functioning. This study indicates a loss of resilience in the aquatic ecosystem of the Barwon-Darling River as a result of water resource developments. A novel approach of using museum specimens of molluscs and fish enabled the trophic status and food web character over a 130-year period to be investigated, for the Barwon-Darling River, Australia, a system heavily impacted by water resource development. Marked differences in the trophic status and components of the food web were detected between before and after water resource development periods as indicated by the stable isotope ratios of the molluscs and fish. However, differences varied between two river zones. Food chain lengths increased but were greater in the upper river zone. Basal source contributions to the food web also changed substantially over time in association with water resource development. A flip to pelagic basal source dominance suggests the loss of resilience of this river system and potential regime shift. |
英文关键词 | food web changes hydrological modification complex response |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448088100045 |
WOS关键词 | STABLE-ISOTOPE VALUES ; FLOW VARIABILITY ; TROPHIC POSITION ; DARLING RIVER ; LOWLAND RIVER ; FOOD WEBS ; CARBON ; PRESERVATION ; DYNAMICS ; STREAM |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21441 |
专题 | 资源环境科学 |
作者单位 | 1.Univ New England, Riverine Landscapes Res Lab, Armidale, NSW, Australia; 2.Winona State Univ, Dept Biol, Large River Studies Ctr, Winona, MN 55987 USA |
推荐引用方式 GB/T 7714 | Thoms, Martin,Delong, Michael. Ecosystem Responses to Water Resource Developments in a Large Dryland River[J]. WATER RESOURCES RESEARCH,2018,54(9):6643-6655. |
APA | Thoms, Martin,&Delong, Michael.(2018).Ecosystem Responses to Water Resource Developments in a Large Dryland River.WATER RESOURCES RESEARCH,54(9),6643-6655. |
MLA | Thoms, Martin,et al."Ecosystem Responses to Water Resource Developments in a Large Dryland River".WATER RESOURCES RESEARCH 54.9(2018):6643-6655. |
条目包含的文件 | 条目无相关文件。 |
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