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Related Experiment Video

Updated: Jan 13, 2026

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

Deterministic and Stochastic Processes Regulate Co-Occurrence Network Structure and Shape Macroinvertebrate Diversity

Wei Liu¹, Mengzhen Xu¹, Giri R Kattel^1,2

¹State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing China.

Ecology and Evolution

|January 9, 2026

Summary

Deterministic and stochastic processes shape biodiversity in Southwest China

Keywords:

Southwest China cave‐reservoir‐and‐stream ecotone co‐occurrence network deterministic and stochastic processes karst landscape macroinvertebrate community

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Area of Science:

Ecology
Biodiversity research
Conservation biology

Background:

Global biodiversity and ecosystems face constant threats.
Understanding deterministic and stochastic processes is key to ecological studies.
Southwest China's Yunnan Province is a biodiversity hotspot with unique karst landscapes.

Purpose of the Study:

To investigate drivers of macroinvertebrate diversity in a Cave-Reservoir-and-Stream (CRS) ecotone.
To assess the roles of deterministic and stochastic processes in shaping biodiversity.
To understand the impact of riverine connectivity on freshwater ecosystems.

Main Methods:

Studied macroinvertebrate communities in a CRS ecotone.
Analyzed co-occurrence networks to identify keystone taxa and modules.
Quantified network properties like diameter and average path length.
Differentiated between deterministic and stochastic process dominance.

Main Results:

Keystone taxa (e.g., Trigomphus) and modules significantly shape community assembly and diversity.
Network analysis revealed differences in connectivity and modularity across cave, reservoir, and stream environments.
Deterministic processes dominated caves (73.6%), stochastic processes dominated streams (85.9%), with near-equal balance in lakes.
Environmental conditions influenced the dominance of deterministic versus stochastic processes.

Conclusions:

Riverine connectivity in karst ecotones is crucial for maintaining endemic freshwater biodiversity.
Keystone taxa and ecological processes are vital for ecosystem services in Southwest China.
Conservation efforts should consider the interplay of deterministic and stochastic factors in maintaining biodiversity.