干旱区生态环境知识资源中心(Arid): Flow regulation by dams impacts more than land use on water quality and benthic communities in high-gradient streams in a semi-arid region

Arid

DOI	10.1016/j.scitotenv.2023.163468
	Flow regulation by dams impacts more than land use on water quality and benthic communities in high-gradient streams in a semi-arid region
	Calderon, Mirian Roxana; Almeida, Cesar Americo; Jofre, Mariana Beatriz; Gonzalez, Silvia Patricia; Miserendino, Maria Laura
通讯作者	Calderon, MR
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2023
卷号	881
英文摘要	In semi-arid regions, water policy has strongly promoted the construction of water reservoirs with little or no consideration for their ecological consequences. In order to quantify the effect induced by flow discontinuity on environmental conditions, water quality, and invertebrate communities at high-gradient streams, we investigated unregulated and regulated reaches at 13 watercourses, located in the Dry Chaco Ecoregion (South America). Dams differed in the dominant land uses (rangeland, agriculture, and urban) of the related catchment area. We assessed on-site hydrogeomorphic features, water quality and bacteriological parameters, habitat condition, chlorophyll a, macrophytes cover, and macroinvertebrate communities. Significant increases in mineral parameters and organic contamination indicators were detected at regulated reaches, such as: conductivity, total solids, turbidity, color, and phosphates. Dams negatively affected habitat condition, and macrophyte cover increased at regulated sites. Macroinvertebrates showed a diminution in most of the metrics analyzed, with a decrease of sensitive groups and an increase in the more tolerant ones. Redundancy Analysis revealed that SWQI (physicochemical based index) and the proportion of coarse gravel were stronger predictors on metrics arrangement. Variance partitioning analyses proved that regulation effects prevailed over land use in explaining metrics variation. Invertebrate community was positively related to better ecological conditions, which suggests that restitution of ecological integrity at regulated reaches should include habitat restoration. These results are relevant for the management of regulated water resources in arid and semi-arid regions in a context of climate change.
英文关键词	Reservoirs Regulated rivers Ecological degradation Biomonitoring Metrics
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000985276800001
WOS关键词	MACROINVERTEBRATE COMMUNITIES ; RIVER ; HABITAT ; BIODIVERSITY ; RESPONSES ; CONSTRUCTION ; ASSEMBLAGES ; DIVERSITY ; IMPROVE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398528
推荐引用方式 GB/T 7714	Calderon, Mirian Roxana,Almeida, Cesar Americo,Jofre, Mariana Beatriz,et al. Flow regulation by dams impacts more than land use on water quality and benthic communities in high-gradient streams in a semi-arid region[J],2023,881.
APA	Calderon, Mirian Roxana,Almeida, Cesar Americo,Jofre, Mariana Beatriz,Gonzalez, Silvia Patricia,&Miserendino, Maria Laura.(2023).Flow regulation by dams impacts more than land use on water quality and benthic communities in high-gradient streams in a semi-arid region.SCIENCE OF THE TOTAL ENVIRONMENT,881.
MLA	Calderon, Mirian Roxana,et al."Flow regulation by dams impacts more than land use on water quality and benthic communities in high-gradient streams in a semi-arid region".SCIENCE OF THE TOTAL ENVIRONMENT 881(2023).