Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1890/ES12-00225.1 |
On the multiple ecological roles of water in river networks | |
Sponseller, Ryan A.1; Heffernan, James B.2; Fisher, Stuart G.3 | |
通讯作者 | Sponseller, Ryan A. |
来源期刊 | ECOSPHERE
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ISSN | 2150-8925 |
出版年 | 2013 |
卷号 | 4期号:2 |
英文摘要 | The distribution and movement of water can influence the state and dynamics of terrestrial and aquatic ecosystems through a diversity of mechanisms. These mechanisms can be organized into three general categories wherein water acts as (1) a resource or habitat for biota, (2) a vector for connectivity and exchange of energy, materials, and organisms, and (3) as an agent of geomorphic change and disturbance. These latter two roles are highlighted in current models, which emphasize hydrologic connectivity and geomorphic change as determinants of the spatial and temporal distributions of species and processes in river systems. Water availability, on the other hand, has received less attention as a driver of ecological pattern, despite the prevalence of intermittent streams, and strong potential for environmental change to alter the spatial extent of drying in many regions. Here we summarize long-term research from a Sonoran Desert watershed to illustrate how spatial patterns of ecosystem structure and functioning reflect shifts in the relative importance of different ’roles of water’ across scales of drainage size. These roles are distributed and interact hierarchically in the landscape, and for the bulk of the drainage network it is the duration of water availability that represents the primary determinant of ecological processes. Only for the largest catchments, with the most permanent flow regimes, do flood-associated disturbances and hydrologic exchange emerge as important drivers of local dynamics. While desert basins represent an extreme case, the diversity of mechanisms by which the availability and flow of water influence ecosystem structure and functioning are general. Predicting how river ecosystems may respond to future environmental pressures will require clear understanding of how changes in the spatial extent and relative overlap of these different roles of water shape ecological patterns. |
英文关键词 | disturbance drought ecohydrology flooding landscapes river continuum |
类型 | Article |
语种 | 英语 |
国家 | Sweden ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000327306400001 |
WOS关键词 | PLANT-SPECIES RICHNESS ; SONORAN DESERT STREAM ; SAN-PEDRO RIVER ; RIPARIAN VEGETATION ; FLOW VARIABILITY ; ECOSYSTEM SERVICES ; SOIL RESPIRATION ; DISTURBANCE ; RESPONSES ; AVAILABILITY |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/176781 |
作者单位 | 1.Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, SE-9018 Umea, Sweden; 2.Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA; 3.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA |
推荐引用方式 GB/T 7714 | Sponseller, Ryan A.,Heffernan, James B.,Fisher, Stuart G.. On the multiple ecological roles of water in river networks[J]. Arizona State University,2013,4(2). |
APA | Sponseller, Ryan A.,Heffernan, James B.,&Fisher, Stuart G..(2013).On the multiple ecological roles of water in river networks.ECOSPHERE,4(2). |
MLA | Sponseller, Ryan A.,et al."On the multiple ecological roles of water in river networks".ECOSPHERE 4.2(2013). |
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