3.3 Biodiversity characteristics of macroinvertebrates

The overall distribution structure of the FFGs of macroinvertebrates in the Jingui River in dry season showed a higher abundance than that in the wet season and normal season (Fig. 2a). The species spanning five FFGs (FC, GC, PR, SC, and SH), were found in this survey.

Fig. 2 shows the variation in abundance and biomass of the five FFGs throughout the survey. As it demonstrated, all five FFGs fluctuated apparently with the season changes in abundance (Fig. 2a). SH showed the least seasonal variability and presented an increase in biomass in all three seasons. In contrast, GC exhibited the least abundance in normal season and most abundance in wet season; while SC, PR, and FC showed the most abundance in dry season and the least in normal season.

On the other hand, the biomass displayed different relative patterns in FFGs (Fig. 2b). The biomass of GC was comparatively high, with the lowest value in wet season and a significantly higher value in dry season. In contrast, biomass of SC is the highest in wet season compared with that in other seasons. In dry season, the biomass of PR displayed the most significant value. FC and SH showed apparent seasonal differences, and the biomass values in dry season were the highest.