Effects of the invasive duckweed Lemna minuta on aquatic animals: evidences from an indoor experiment

Since effects of alien invasive free-floating plants can be relevant in aquatic ecosystems, we investigatedthe non-native Lemna minuta impact on four aquatic animal groups: Hydra vulgaris(Coelenterates), Asellus aquaticus (Arthropods), Gambusia affinis (Fish), Bufo bufo tadpoles(Amphibians). An indoor experiment was conducted keeping animals in water held in tanks with L.minuta mats of 0.5 (WI1), 1.5cm thick (WI2) and without mats (WOU). Water parameters (DO, DO%,pH) and animal responses (survival rate, vitality) were measured every 48 h (0–288 h). Treatments withmats showed significant impacts on animals which were more severe with increasing mat thickness.Strong decreasing of oxygen and pH associated with mat occurrence had a large impact on animals.In WI2 all individuals died within 144 h (H. vulgaris, B. bufo within 96h), while in WI1 there was ahigher survival rate and vitality (excluding B. bufo died within 96 h) and in WOU no deaths. This evidencesuggests L. minuta thick mats (1.5cm) could have a high impact on animal biodiversity, especiallyreducing oxygenation level in aquatic ecosystem.