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Related Experiment Video

Updated: Nov 29, 2025

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

How does fish functional diversity respond to environmental changes in two large shallow lakes?

Zhigang Mao¹, Xiaohong Gu¹, Yong Cao²

¹State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.

The Science of the Total Environment

|November 19, 2020

Summary

Functional diversity (FD) of fish communities is sensitive to environmental changes and human activities. Understanding these drivers is crucial for effective freshwater biodiversity and fisheries management.

Keywords:

Fish stocking Functional dispersion Human activities Random Forests regression Water quality

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Area of Science:

Ecology
Freshwater biodiversity research
Ecosystem dynamics

Background:

Freshwater biodiversity faces increasing threats from environmental changes and human activities.
Species richness alone is insufficient; a trait-based approach is needed to understand biodiversity's causal role.
Functional diversity (FD) indices quantify trait variation, reflecting species' ecosystem contributions.

Purpose of the Study:

To quantify fish community functional diversity (FD) in two Chinese lakes with varying disturbance levels.
To identify environmental variables driving long-term FD trends.
To compare the sensitivity of FD versus species richness to multiple disturbances.

Main Methods:

Utilized long-term monitoring data from two large shallow lakes in China.
Applied Random-Forests regression to link FD changes with environmental variables.
Analyzed fish stocking, water quality, climate, and hydrological data.

Main Results:

Fish stocking, water quality, climate, and hydrology were key predictors of FD trends.
Drivers of FD varied between lakes: human activities in Lake Taihu, physicochemical factors in Lake Hulun.
FD indices were more sensitive than species richness to multiple disturbances.

Conclusions:

Functional diversity provides a more sensitive measure of ecosystem alteration than species richness.
Identifying specific drivers of FD is essential for targeted lake and fisheries management.
This research enhances understanding of fish community responses to environmental change.