University of Oulu

Jun Wang, Simin Bao, Kai Zhang, Jani Heino, Xiaoming Jiang, Zhenyuan Liu, Juan Tao, Responses of macroinvertebrate functional trait structure to river damming: From within-river to basin-scale patterns, Environmental Research, Volume 220, 2023, 115255, ISSN 0013-9351,

Responses of macroinvertebrate functional trait structure to river damming : from within-river to basin-scale patterns

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Author: Wang, Jun1; Bao, Simin1; Zhang, Kai2;
Organizations: 1Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture and Rural Affair/ Engineering Research Center of Green Development for Conventional Aquatic Biological Industry in the Yangtze River Eco-nomic Belt, Ministry of Education, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China
2Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China
3Geography Research Unit, University of Oulu, P.O. Box 8000, FI-90014 Oulu, Finland
4State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China
5Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2025-01-09


Revealing how aquatic organisms respond to dam impacts is essential for river biomonitoring and management. Traditional examinations of dam impacts on macroinvertebrate assemblages were frequently conducted within single rivers (i.e., between upstream vs. downstream locations) and based on taxonomic identities but have rarely been expanded to level of entire basins (i.e., between dammed vs. undammed rivers) and from a functional trait perspective. Here, we evaluated the effects of dams on macroinvertebrate assemblages at both the within-river and basin scales using functional traits in two comparable tropical tributaries of the Lancang-Mekong River. At different scales, maximum body size, functional feeding groups (FFG), voltinism and occurrence in drift respond significantly to dam impact. Armoring categories varied significantly between downstream sites and upstream sites, and oviposition behavior, habits and adult life span significantly differed between rivers. The key traits at the within-river scale resembled to those at the between-river scale, suggesting that within-river trait variation could further shape functional trait structure at the basin scale in dammed rivers. Furthermore, water nutrients and habitat quality induced by dams showed the most important role in shaping trait structure, although trait-environment relationships varied between the two different scales. In addition, the trait-environment relationships were stronger in the dry season than in the wet season, suggesting a more important role of environmental filtering processes in the dry season compared with the wet season. This study highlights the utility of the trait-based approach to diagnose the effects of damming and emphasizes the importance of spatial scale to examine dam impacts in riverine systems.

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Series: Environmental research
ISSN: 0013-9351
ISSN-E: 1096-0953
ISSN-L: 0013-9351
Volume: 220
Article number: 115255
DOI: 10.1016/j.envres.2023.115255
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
1172 Environmental sciences
1181 Ecology, evolutionary biology
Funding: This study was financially supported by the National Natural Science Foundation of China (No. 41907400), China Postdoctoral Science Foundation (No. 2019M663583), and the Yunnan Applied Basic Research Projects (No. 2019FB131).
Copyright information: © 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license by