Without human intervention, ponds progressively fill up with aquatic vegetation, so that the structure and age of the vegetal
formations show great contrasts within a given set of water bodies. We hypothesized that the biological traits of pond invertebrate
communities differed significantly among ponds having different vegetal formations. To test this hypothesis, we selected three
neighbouring ponds showing a gradient of vegetation cover and type (sparse bryophytes on rocky substrata (pond 1), extensive
submerged Chara beds (pond 2), aerial Typha stands (pond 3)), and we studied between-ponds variations in the combinations of
species traits. Taxa biomass was monthly recorded in each pond over one year, to take into account species’ seasonality. Species
traits were described using a fuzzy-coding method and a simultaneous analysis of the two matrices (co-inertia analysis) was used
to investigate changes in biological trait composition. Biomass increased from pond 1 to pond 3, and was higher in vegetal than in
muddy mesohabitats. Among 25 biological traits, 10 were significantly correlated to the distribution of samples: number of generations
per year, cohort production interval, adult longevity, adult size, number of eggs per female, dispersal ability, dispersal mode,
consumer level, ingested food type, and feeding group. Invertebrates in pond 1 species allocated much energy to reproduction,
while in pond 3 resource use was favoured by larger body size, long-lived organisms, and a higher diversity of feeding groups.
Our results suggest that the structure and age of the vegetal formation play role in selecting species traits related to population
dynamics and feeding habits.