What question did this study set out to answer?

To determine how geomorphic reach types and seasonal variations influence community composition, diversity, and assembly mechanisms of benthic macroinvertebrates in river ecosystems.

September 17, 2026WaterOpen Access

Spatiotemporal Patterns and Assembly Processes of Benthic Macroinvertebrate Communities in River Reaches of Different Geomorphic Types in Sichuan Province, China

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Authors

XHXinbei Huang SLSiyao Liu XTXiaogang Tian

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Overview

Ecological survey reveals deterministic processes and seasonal shifts shape benthic macroinvertebrates across river reaches, highlighting the need for geomorphically tailored bioassessment.

Key Points

To determine how geomorphic reach types and seasonal variations influence community composition, diversity, and assembly mechanisms of benthic macroinvertebrates in river ecosystems.
Surveyed benthic macroinvertebrates at 49 sites across seven rivers during spring and autumn 2025, categorizing reaches into Mountain, Hilly, and Plain types.
Assessed community patterns and environmental predictors of Ephemeroptera, Plecoptera, and Trichoptera (EPT) richness using principal coordinate analysis and random forest models.
Evaluated community assembly mechanisms across reach types and seasons using a neutral community model and the modified stochasticity ratio.
Reach type accounted for 10.3% of community composition variation in spring and 11.4% in autumn, with taxa richness and Shannon and Margalef diversity indices peaking in Hilly and Plain reaches.
Random forest models identified dissolved oxygen, channel width, elevation, and ammonia nitrogen as primary predictors of EPT richness in spring, whereas permanganate index, dissolved oxygen, and flow velocity dominated in autumn.
Community assembly was predominantly deterministic across all settings (mean modified stochasticity ratio < 0.5), reaching the highest deterministic contribution in Mountain reaches at 80.97%.

Cite This Study

Huang et al. (2026) studied this question.

synapsesocial.com/papers/6aabb6725f706d05830e4f8b https://doi.org/10.3390/w18182308

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September 17, 2026WaterOpen Access

Spatiotemporal Patterns and Assembly Processes of Benthic Macroinvertebrate Communities in River Reaches of Different Geomorphic Types in Sichuan Province, China

View Full Paper

Ask AI

Bookmark

Authors

XHXinbei Huang SLSiyao Liu XTXiaogang Tian

Discussion

Member takes

Overview

Ecological survey reveals deterministic processes and seasonal shifts shape benthic macroinvertebrates across river reaches, highlighting the need for geomorphically tailored bioassessment.

Key Points

To determine how geomorphic reach types and seasonal variations influence community composition, diversity, and assembly mechanisms of benthic macroinvertebrates in river ecosystems.
Surveyed benthic macroinvertebrates at 49 sites across seven rivers during spring and autumn 2025, categorizing reaches into Mountain, Hilly, and Plain types.
Assessed community patterns and environmental predictors of Ephemeroptera, Plecoptera, and Trichoptera (EPT) richness using principal coordinate analysis and random forest models.
Evaluated community assembly mechanisms across reach types and seasons using a neutral community model and the modified stochasticity ratio.
Reach type accounted for 10.3% of community composition variation in spring and 11.4% in autumn, with taxa richness and Shannon and Margalef diversity indices peaking in Hilly and Plain reaches.
Random forest models identified dissolved oxygen, channel width, elevation, and ammonia nitrogen as primary predictors of EPT richness in spring, whereas permanganate index, dissolved oxygen, and flow velocity dominated in autumn.
Community assembly was predominantly deterministic across all settings (mean modified stochasticity ratio < 0.5), reaching the highest deterministic contribution in Mountain reaches at 80.97%.

Cite This Study

Huang et al. (2026) studied this question.

synapsesocial.com/papers/6aabb6725f706d05830e4f8b https://doi.org/10.3390/w18182308

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