Resumo. Abstract: Aim To understand the distribution of functional feeding groups (FFGs) of aquatic and semiaquatic insects associated with macrophytes in a lentic system, we tested whether the abundance of FFGs varied across sampling periods and analyzed the variation of environmental variables related to FFG composition. Methods We evaluated the distribution of FFGs in four samplings conducted in March, May, July, and September of 2022, during different seasons of the year. The sampling locations were three sites in the Ponte Lake, located in the Porto Alegre Botanical Garden, southern Brazil. Relative abundances (%) were calculated for each family and for each FFG per sampling period. In this study, each seasonal sampling was considered a sample, and the three lake points were treated as subsamples. Data analysis was performed using Principal Component Analysis (PCA), Permutational Multivariate Analysis of Variance, and the Chi-square test (χ2). Results The two-axis PCA explained 90.47% of the variation. The variables that most contributed to the formation of the first axis were temperature, pH, and dissolved oxygen, with a positive relationship, while turbidity contributed most to the second axis, with a negative relationship. The χ2 test confirmed differences in FFG abundances among the sampling periods. We collected 4.872 specimens, representing 24 families distributed across five orders. Collector-gatherers were the most abundant in the study (N = 3.126), with higher abundance in autumn (N = 899), followed by predators (N = 1.385), more abundant in summer (N = 582), and collector-filterers (N = 359), also more abundant in summer (N = 158). Conclusions These findings contribute to a better understanding of how environmental factors drive the diversity of functional feeding groups in lentic systems and highlight the ecological role of macrophytes as complex mesohabitats that are essential for the structuring of aquatic insect communities.