University of Oulu

Zheng, P., Jiang, X., Shu, F., Li, Z., Zhang, S., Alahuhta, J., & Heino, J. (2022). Loss of lateral hydrological connectivity impacts multiple facets of molluscan biodiversity in floodplain lakes. Journal of Environmental Management, 320, 115885.

Loss of lateral hydrological connectivity impacts multiple facets of molluscan biodiversity in floodplain lakes

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Author: Zheng, Peng1; Jiang, Xiaoming1; Shu, Fengyue2;
Organizations: 1State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, Shaanxi, China
2Provincial Key Laboratory of Wetland Ecology and Environment Conservation of Lake Nansihu, Qufu Normal University, Qufu, 273165, China
3Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
4Geography Research Unit, University of Oulu, P. O. Box 8000, FI-90014, Oulu, Finland
5Freshwater Center, Finnish Environment Institute, Paavo Havaksen Tie 3, Oulu, FI-90014, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2024-08-11


Lateral hydrological connectivity (LHC) is a key process in maintaining aquatic biodiversity in river floodplain ecosystems. However, the effects of LHC loss on aquatic biodiversity are rarely studied. Here, we evaluated, for the first time, the responses of multiple facets (i.e., taxonomic, functional and phylogenetic) of alpha and beta diversity of freshwater molluscs to the LHC loss in 23 floodplain lakes in the Yangtze River Basin in China. Our results showed that taxonomic and functional alpha diversities were all significantly higher in connected lakes (CLs) than in disconnected lakes (DLs), whereas phylogenetic alpha diversity (Δ⁺) was lower in CLs than in DLs. For beta diversity facets, taxonomic (Tβsor) and phylogenetic (Pβsor) dissimilarities were slightly more contributed by the turnover component or equally contributed by the turnover and nestedness-resultant components both in CLs and DLs. Instead, functional beta diversity (Fβsor), generally showing much lower values than Tβsor and Pβsor, was mainly contributed by the nestedness-resultant component (76.6–84.0%), especially in DLs. We found that only functional dissimilarities were significantly higher in DLs than CLs, indicating a high level of functional diversity loss without replacement of species possessing traits sensitive to hydrological disconnection (i.e., large body size, lamellibranch body form, filter feeding, ovoviviparity and burrowing habits). In general, lake area, hydrological connectivity, aquatic vegetation coverage and nutrient levels (TN and TP) played important roles in structuring variation in molluscan alpha and beta diversities, although the three diversity facets responded to different environmental factors. Our results suggest that loss of connectivity to the mainstem river has negative impacts on molluscan assemblages in floodplain lakes. More importantly, as taxonomic, functional and phylogenetic diversities responded somewhat differently to the loss of hydrological connectivity, all of these biodiversity facets should be better incorporated into aquatic biodiversity assessment and conservation programs in large river floodplains.

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Series: Journal of environmental management
ISSN: 0301-4797
ISSN-E: 1095-8630
ISSN-L: 0301-4797
Volume: 320
Article number: 115885
DOI: 10.1016/j.jenvman.2022.115885
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
1172 Environmental sciences
1181 Ecology, evolutionary biology
Funding: This work was financially supported by the National Natural Science Foundation of China (No.31770460, 31672255, 51979241).
Copyright information: © 2022 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.