Arid
DOI10.1111/1365-2664.13109
Pulsed flows, tributary inputs and food-web structure in a highly regulated river
Sabo, John L.1,2; Caron, Melanie3,4; Doucett, Rick3,7; Dibble, Kimberly L.5; Ruhi, Albert1; Marks, Jane C.6; Hungate, Bruce A.3,4; Kennedy, Ted A.5
通讯作者Sabo, John L.
来源期刊JOURNAL OF APPLIED ECOLOGY
ISSN0021-8901
EISSN1365-2664
出版年2018
卷号55期号:4页码:1884-1895
英文摘要

1. Dams disrupt the river continuum, altering hydrology, biodiversity and energy flow. Although research indicates that tributary inputs have the potential to dilute these effects, knowledge at the food-web level is still scarce.


2. Here, we examined the riverine food-web structure of the Colorado River below Glen Canyon Dam, focusing on organic matter sources, trophic diversity and food chain length. We asked how these components respond to pulsed flows from tributaries following monsoon thunderstorms that seasonally increase streamflow in the American Southwest.


3. Tributaries increased the relative importance of terrestrial organic matter, particularly during the wet season below junctures of key tributaries. This contrasted with the algal-based food-web present immediately below Glen Canyon Dam.


4. Tributary inputs during the monsoon also increased trophic diversity and food chain length: food chain length peaked below the confluence with the largest tributary (by discharge) in Grand Canyon, increasing by >1 trophic level over a 4-5 km reach possibly due to aquatic prey being flushed into the mainstem during heavy rain events.


5. Our results illustrate that large tributaries can create seasonal discontinuities, influencing riverine food-web structure in terms of allochthony, food-web diversity and food chain length.


6. Synthesis and applications. Pulsed flows from unregulated tributaries following seasonal monsoon rains increase the importance of terrestrially derived organic matter in large, regulated river food webs, increasing food chain length and trophic diversity downstream of tributary inputs. Protecting unregulated tributaries within hydropower cascades may be important if we are to mitigate food-web structure alteration due to flow regulation by large dams. This is critical in the light of global hydropower development, especially in megadiverse, developing countries where dam placement (including completed and planned structures) is in tributaries.


英文关键词allochthonous inputs dams food chain length hydrologic alteration maximum trophic position pulsed flow serial discontinuity
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000434970200030
WOS关键词COLORADO RIVER ; GRAND-CANYON ; AQUATIC CONSUMERS ; TROPHIC POSITION ; CADILLAC DESERT ; STABLE-ISOTOPES ; HUMPBACK CHUB ; HYDROPOWER ; BIODIVERSITY ; DAMS
WOS类目Biodiversity Conservation ; Ecology
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构United States Geological Survey ; Arizona State University ; University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210475
作者单位1.Arizona State Univ, Julie Ann Wrigley Global Inst Sustainabil, Tempe, AZ 85281 USA;
2.Arizona State Univ, Sch Life Sci, Tempe, AZ 85281 USA;
3.No Arizona Univ, Colorado Plateau Stable Isotope Lab, Flagstaff, AZ 86011 USA;
4.No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA;
5.US Geol Survey, Southwest Biol Sci Ctr, Grand Canyon Monitoring & Res Ctr, Flagstaff, AZ 86001 USA;
6.No Arizona Univ, Dept Biol Sci, Box 5640, Flagstaff, AZ 86011 USA;
7.Univ Calif Davis, Dept Plant Sci, Stable Isotope Facil, Room 1210 PES,One Shields Ave, Davis, CA USA
推荐引用方式
GB/T 7714
Sabo, John L.,Caron, Melanie,Doucett, Rick,et al. Pulsed flows, tributary inputs and food-web structure in a highly regulated river[J]. United States Geological Survey, Arizona State University, University of California, Davis,2018,55(4):1884-1895.
APA Sabo, John L..,Caron, Melanie.,Doucett, Rick.,Dibble, Kimberly L..,Ruhi, Albert.,...&Kennedy, Ted A..(2018).Pulsed flows, tributary inputs and food-web structure in a highly regulated river.JOURNAL OF APPLIED ECOLOGY,55(4),1884-1895.
MLA Sabo, John L.,et al."Pulsed flows, tributary inputs and food-web structure in a highly regulated river".JOURNAL OF APPLIED ECOLOGY 55.4(2018):1884-1895.
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